16.1 First Aid, CPR & Tactical Emergency Casualty Care (TECC)

16.1 First Aid, CPR & Tactical Emergency Casualty Care (TECC)

AZPOST Comprehensive Examination Focus: Peace officer recruits must demonstrate mastery of emergency medical interventions, casualty assessment algorithms, and operational trauma management governed by Ariz. Admin. Code R13-4-116(E)(1)(h)(i). The AZPOST certification exam rigorously evaluates candidate proficiency across three distinct operational phases of Tactical Emergency Casualty Care (TECC), the MARCH treatment hierarchy, mechanical arterial tourniquet placement criteria, junctional hemostatic wound packing, manual and adjunct airway management with nasopharyngeal airways (NPAs) including absolute contraindications, penetrating thoracic trauma and vented chest seal mechanics, tension pneumothorax identification, AHA CPR/AED parameters, synthetic opioid overdose identification and intranasal Naloxone (Narcan) deployment protocols under A.R.S. § 36-2266, hemorrhagic shock progression, and the clinical diagnosis and rapid cooling protocols for desert heat stroke.

In contemporary law enforcement operations, violent physical confrontations, active assailant incidents, vehicular collisions, and environmental hazards place peace officers in dynamic environments where standard civilian emergency medical services (EMS) cannot immediately enter. Historically, military combat data from the Committee on Tactical Combat Casualty Care (CoTCCC) and civilian operational analyses from the Committee for Tactical Emergency Casualty Care (C-TECC) demonstrate that preventable traumatic deaths occur primarily from three physiological insults:

1. Severe Extremity Hemorrhage (approximately 60% of preventable deaths): Uncontrolled arterial bleeding leading to rapid exsanguination and irreversible hemorrhagic shock within 90 to 180 seconds.
2. Tension Pneumothorax (approximately 33% of preventable deaths): Progressive air accumulation within the pleural cavity causing total lung collapse, mediastinal shift, mechanical compression of the superior and inferior vena cava, and fatal obstructive shock.
3. Airway Compromise / Obstruction (approximately 6% of preventable deaths): Loss of airway patency resulting from soft tissue trauma, facial fractures, blood or emesis aspiration, or flaccid tongue occlusion in unresponsive casualties.

To address these preventable mortalities, Arizona peace officers operate under the specialized framework of Tactical Emergency Casualty Care (TECC), which adapts military battlefield trauma principles to civilian law enforcement environments where active threats, civilian bystanders, and resource constraints dictate medical priorities.

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1. Tactical Emergency Casualty Care (TECC) Threat Zones & Operational Priorities

TECC establishes three discrete operational phases based on the geographic and tactical relationship between the responding officer, the casualty, and the active threat. Interventions that are lifesaving in one zone represent fatal tactical errors if attempted in another.

+-------------------------------------------------------------------------+
|          TECC OPERATIONAL THREAT PHASES & INTERVENTION TIERS            |
+-------------------------------------------------------------------------+
|  PHASE 1: DIRECT THREAT CARE (DTC) / CARE UNDER FIRE (HOT ZONE)         |
|  - Active hostile fire / uncontained lethal hazard                      |
|  - Primary Medical Intervention: FIRE SUPERIORITY & THREAT NEUTRALIZATION|
|  - Medical Care: Commercial Arterial Limb Tourniquet ONLY ("High & Tight")|
|  - Casualty Action: Direct conscious casualty to return fire, seek cover|
+-------------------------------------------------------------------------+
                                     | 
                                     v
+-------------------------------------------------------------------------+
|  PHASE 2: INDIRECT THREAT CARE (ITC) / TACTICAL FIELD CARE (WARM ZONE)  |
|  - Under ballistic cover / threat suppressed, isolated, or contained    |
|  - Ambient danger persists; security perimeter maintained               |
|  - Execution of MARCH Algorithm: Hemorrhage, Airway, Respiration,       |
|    Circulation, Hypothermia / Head Trauma                               |
|  - Reassess tourniquets, pack junctional wounds, vented chest seals     |
+-------------------------------------------------------------------------+
                                     | 
                                     v
+-------------------------------------------------------------------------+
|  PHASE 3: TACTICAL EVACUATION CARE (TACEVAC) / COLD ZONE                |
|  - Staging area / Casualty Collection Point (CCP) / Threat neutralized  |
|  - Packaging for transport, hypothermia mitigation, vital sign tracking |
|  - Structured MIST / SBAR medical handoff to incoming civilian EMS      |
+-------------------------------------------------------------------------+

Direct Threat Care (DTC) / Hot Zone

Direct Threat Care occurs while officers and casualties are within the effective weapons range of an active, uncontained threat (e.g., active shooter, armed barricaded subject, unexploded ordnance).

• Primary Objective: Threat suppression and fire superiority. Tactical doctrine dictates that the single best medicine on the battlefield is fire superiority. Suppressing or neutralizing the suspect eliminates the generation of additional casualties.
• Self-Aid and Casualty Direction: If the casualty is conscious and capable, officers must verbally direct them to find cover, return fire, and apply self-aid (such as self-applying their own tourniquet).
• Permissible Medical Interventions: Medical care under direct fire is strictly restricted to the rapid deployment of a commercial arterial limb tourniquet placed "high and tight" over duty clothing to arrest catastrophic extremity bleeding. No other clinical interventions—including airway positioning, nasopharyngeal airway insertion, junctional wound packing, chest seal placement, or CPR—are authorized. Attempting complex medical tasks under direct fire increases officer vulnerability and results in catastrophic tactical failure.
• Casualty Movement: If the casualty is incapacitated in the open, officers must weigh the tactical risk of an open-air rescue versus establishing suppressive fire, utilizing ballistic shields, deploying smoke canisters, or utilizing tactical vehicles as rolling ballistic cover.

Indirect Threat Care (ITC) / Warm Zone

Indirect Threat Care begins once the casualty and rescuers have moved behind physical ballistic cover (e.g., engine blocks, masonry walls) or after the threat has been driven away, contained, or suppressed by perimeter teams, although an active or ambient hazard may still exist in the structure or sector.

• Tactical Priorities: Establish 360-degree security, designate entry/exit corridors, and systematically execute the MARCH protocol.
• Permissible Interventions: Reassessment of DTC tourniquets, deliberate application of secondary tourniquets, wound packing of junctional trauma with hemostatic gauze, opening airways via manual maneuvers, placement of nasopharyngeal airways, application of vented chest seals to penetrating thoracic wounds, management of tension pneumothorax, and initiation of hypothermia prevention.

Tactical Evacuation Care (TACEVAC) / Cold Zone

Tactical Evacuation Care occurs in areas secured by law enforcement where no active threat exists, such as a secure Casualty Collection Point (CCP) or triage staging corridor.

• Tactical Priorities: Preparing litters, packaging casualties against hypothermia, continuous reassessment of vitals and dressings, coordinating with incident command, and executing structured medical handoffs to civilian paramedics.
• Operational Handoff Protocol (MIST Report): Officers must deliver a standardized, concise MIST handover to transport personnel:
  • M — Mechanism of injury (e.g., high-velocity gunshot wound to right groin, blast fragment, vehicle impact).
  • I — Injuries identified (e.g., penetrating trauma to right femoral triangle, sucking chest wound right anterior thorax).
  • S — Signs and symptoms (e.g., pulse rate 130 bpm weak/thready, respirations 28 shallow, alert to voice only).
  • T — Treatments rendered (e.g., hemostatic gauze packed into right groin held for 3 minutes with Israeli bandage, vented chest seal applied at 1410 hours, tourniquet applied to left arm at 1405 hours).

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2. Traumatic Hemorrhage Control & The MARCH Protocol

The MARCH protocol is the evidence-based tactical trauma assessment standard adopted by AZPOST, prioritizing interventions based on the statistical lethality of combat wounds.

[ M ] MASSIVE HEMORRHAGE ---> Arterial limb tourniquets, junctional wound packing, pressure dressings
  |
[ A ] AIRWAY --------------> Recovery position, Jaw-Thrust, Nasopharyngeal Airway (NPA)
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[ R ] RESPIRATION ---------> Vented chest seals, burping seals, needle decompression for tension pneumo
  |
[ C ] CIRCULATION ---------> Pelvic binding, shock assessment, pulse checks, permissive hypotension
  |
[ H ] HYPOTHERMIA / HEAD --> Active thermal packaging (hypothermia blankets), TBI screening, eye shields

Vascular Anatomy & Hemorrhage Classification

Rapid clinical recognition of the hemorrhage source dictates immediate intervention selection:

• Arterial Hemorrhage: Bright red, oxygenated blood spurting or pulsating rhythmically under high systemic arterial pressure (100–120 mmHg). Capable of emptying circulating blood volume to fatal levels in under 2 minutes. Requires immediate mechanical arterial tourniquet compression or bone-anchored junctional packing.
• Venous Hemorrhage: Dark red, deoxygenated blood flowing in a steady, heavy stream under low hydrostatic pressure. If copious, treated with direct pressure, wound packing, or tourniquets.
• Capillary Hemorrhage: Brick red blood oozing slowly from superficial capillary beds (scrapes, abrasions). Easily managed with minor pressure dressings.

Commercial Arterial Tourniquets: Mechanics & Application

AZPOST approves modern windlass-based commercial tourniquets, primarily the Combat Application Tourniquet (C-A-T) and the Special Operations Forces Tactical Tourniquet - Wide (SOFTT-W). Improvised tourniquets (belts, bandanas, zip-ties) fail in over 75% of applications due to insufficient mechanical advantage, narrow width causing localized tissue shearing, and inability to maintain arterial occlusion pressure.

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|                 TOURNIQUET APPLICATION PROTOCOL COMPARISON              |
+-------------------------------------------------------------------------+
|  HOT ZONE (DIRECT THREAT CARE):                                         |
|  - Location: "High and Tight" on the affected extremity                 |
|  - Over duty uniform clothing; do NOT expose or clean wound             |
|  - Speed is paramount (target application < 30 seconds)                 |
|                                                                         |
|  WARM ZONE (INDIRECT THREAT CARE):                                      |
|  - Location: 2 to 3 inches proximal (above) wound over bare skin        |
|  - Expose wound fully; verify exact anatomical bleeding site            |
|  - NEVER place over a joint (knee or elbow) or over cargo pockets       |
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Step-by-Step Tourniquet Application Mechanics

1. Placement Geometry:
   • In Direct Threat Care, route the tourniquet strap high and tight on the injured extremity over duty clothing.
   • In Indirect Threat Care, cut away uniform fabric to visualize the wound and place the band 2 to 3 inches proximal to the wound directly against skin.
   • Prohibited Sites: Never place a tourniquet directly over a joint (knee or elbow) because the underlying skeletal anatomy prevents the band from compressing the artery against solid bone. Never place over pockets containing duty gear, magazines, or pocketknives.
2. Eliminate All Slack Before Tightening: Pull the self-adhering band as tightly as humanly possible through the friction buckle before turning the windlass rod. Failing to remove all initial slack is the single most common cause of tourniquet failure, causing the windlass to bind upon itself before achieving arterial occlusion.
3. Windlass Rotation Standard: Twist the windlass rod until all bright red spurting bleeding ceases and distal pulses are completely eliminated (e.g., radial pulse for upper extremity, dorsalis pedis/posterior tibial pulse for lower extremity). Tourniquets that stop venous return but fail to occlude arterial pressure increase blood loss by trapping arterial inflow within the limb.
4. Locking & Time Documentation: Secure the windlass rod inside the windlass clip. Close the windlass safety strap over the clip. Write the exact time of application on the time strap (e.g., "T = 1432") and write "T = 1432" directly on the casualty's forehead with a permanent marker to guarantee incoming triage teams see it immediately.
5. The Second Tourniquet Rule: If arterial bleeding or distal pulses persist after the first tourniquet is fully tightened and locked, apply a second tourniquet immediately adjacent and proximal (above) to the first. Severe muscular thighs often require two tourniquets to achieve complete arterial occlusion.
6. Absolute Prohibition of Field Removal: Peace officers must NEVER loosen, adjust, or remove a tourniquet in the field once applied. Loosening a tourniquet releases accumulated anaerobic metabolic toxins (lactic acid, potassium, myoglobin) into systemic circulation, precipitating fatal cardiac arrhythmias, and causes sudden exsanguination from dislodged clots. Tourniquet conversion or removal is strictly within the medical scope of emergency physicians or specialized tactical flight paramedics.

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3. Junctional Hemorrhage & Advanced Hemostatic Wound Packing

Junctional zones are anatomical transition areas where the limbs meet the torso and the neck meets the shoulders: the inguinal triangle (groin), the axillary space (armpit), and the base of the neck. Because commercial limb tourniquets cannot physically seat around the torso junctions, massive bleeding in these zones is managed through aggressive hemostatic wound packing.

[ EXPOSE WOUND ] ---> [ CLEAR CAVITY ] ---> [ LOCATE ARTERY ] ---> [ PACK ACCORDION ]
  Cut clothing          Remove clots          Feel bleeding bone     Kaolin / Chitosan
                                                                           |
[ EVACUATION ]   <--- [ APPLY DRESSING ] <--- [ 3-MINUTE HOLD ] <----------+
  Monitor vitals        Israeli bandage        Aggressive manual hold

Hemostatic Gauze Chemistry

Standard cotton gauze relies entirely on the body's natural intrinsic clotting cascade, which is severely compromised in patients developing hypothermia or shock. AZPOST-approved hemostatic dressings are impregnated with active clotting agents:

• Kaolin-Impregnated Gauze (e.g., QuikClot Combat Gauze): Kaolin is an inert inorganic mineral that rapidly activates Factor XII (Hageman factor) of the intrinsic clotting cascade, accelerating the formation of a robust fibrin matrix without generating exothermic heat.
• Chitosan-Based Dressings (e.g., Celox, ChitoGauze): Derived from crustacean chitin, positively charged chitosan binds electrostatically to negatively charged red blood cells, creating an immediate mechanical gel plug independent of the body's physiological clotting factors. Safe for individuals with shellfish allergies because the proteins that trigger allergic reactions are removed during manufacturing.

Wound Packing Mechanics

1. Expose and Clear: Rapidly cut away duty uniform and armor. Use gloved fingers to sweep large, unattached blood clots out of the wound cavity to allow direct contact with the bleeding vessel.
2. Locate the Bleeding Source: Insert fingers into the wound cavity to locate the active pulsatile jet and press the bleeding vessel directly against underlying skeletal bone.
3. Accordion Packing: Begin feeding hemostatic gauze into the cavity, packing it tightly against the bleeding vessel. Continue feeding the gauze in an "accordion" or "z-fold" fashion, packing every square millimeter of dead space within the cavity until the wound is densely packed above skin level.
4. The Mandatory 3-Minute Direct Pressure Hold: Maintain continuous, aggressive, two-handed manual downward pressure over the packed wound for a minimum of three continuous minutes (five minutes if using non-hemostatic standard cotton gauze). Do not release pressure to "peek" at the wound during this interval, as doing so tears newly forming fibrin clots.
5. Secure with Pressure Bandage: Secure the wound with an elastic pressure dressing (such as an Israeli Emergency Bandage or H-Bandage), wrapping the elastic wrap firmly across the wound and engaging the pressure bar to maintain sustained mechanical compression during tactical movement.

[!CAUTION] Cavity Packing Restrictions: Hemostatic wound packing is authorized strictly for junctional and extremity wounds. Officers must NEVER pack hemostatic gauze into the thoracic cavity (chest) or the peritoneal cavity (abdomen). Packing inside the chest or abdomen cannot compress vessels against bone and causes fatal internal organ compression or surgical complications.

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4. Tactical Airway Management & Cervical Precautions

Once catastrophic external hemorrhage is controlled, officers immediately address the A (Airway) phase of the MARCH protocol. An occluded airway will cause irreversible brain damage within 4 to 6 minutes.

Conscious vs. Unconscious Airway Positioning

• Conscious Casualties: Allow conscious casualties to assume whatever position of comfort best protects their airway. Casualties with severe maxillofacial bleeding typically sit upright and lean forward, allowing blood and secretions to drain out of the mouth rather than aspirating into the trachea.
• Unconscious Casualties with Spontaneous Respiration: Place the unresponsive casualty in the lateral recovery position (on their side). Gravity pulls the relaxed tongue forward off the posterior pharyngeal wall and directs vomit and saliva outward onto the ground.

Manual Airway Opening Maneuvers

• Head-Tilt / Chin-Lift: Utilized strictly for non-traumatic medical collapse (e.g., sudden cardiac arrest, heat exhaustion) where cervical spine trauma is absent. The officer places one palm on the forehead and the fingers of the other hand beneath the bony chin, tilting the head backward.
• Jaw-Thrust Maneuver: Mandated for all trauma casualties where cervical spine trauma is suspected (e.g., blast injuries, falls from fences, vehicle collisions, gunshot trauma to head or neck). The officer kneels at the casualty's head, places both index and middle fingers behind the angles of the lower mandible (jawbone), and lifts upward and forward with both hands without tilting the head or extending the cervical neck.

Nasopharyngeal Airway (NPA) Deployment

The Nasopharyngeal Airway (NPA) is a soft, flexible rubber or neoprene tube inserted into the nasal passage to secure a patent air channel between the nostrils and the hypopharynx.

• Indications: Semi-conscious or unresponsive casualties with snoring respirations, an intact or hyperactive gag reflex, or clenched jaw muscles (trismus). Unlike rigid oropharyngeal airways (OPAs), an NPA is tolerated well by semi-conscious patients without inducing vomiting.
• Sizing: Select the proper length by measuring the distance from the tip of the casualty's nose to the earlobe (tragus). Diameter should match the thickness of the casualty's little (pinky) finger.
• Insertion Protocol:
  1. Thoroughly lubricate the NPA tube using a water-soluble lubricant (or the casualty's own saliva in extreme field exigencies; never petroleum jelly).
  2. Position the casualty's head in a neutral posture.
  3. Insert into the larger/right nostril with the beveled edge facing toward the nasal septum (center of the nose).
  4. Push gently straight backward along the anatomical floor of the nasal cavity (parallel to the roof of the mouth, NOT angled upward into the nasal bridge).
  5. If resistance is met, rotate slightly or withdraw and insert into the opposite nostril.
  6. Advance until the flared flange rests securely against the nostril opening.
• Absolute Contraindications: Visible clinical indicators of a basilar skull fracture: clear cerebrospinal fluid (CSF) draining from the nose (rhinorrhea) or ears (otorrhea), bilateral periorbital ecchymosis ("raccoon eyes"), or post-auricular mastoid ecchymosis ("Battle's sign"). Inserting an NPA in the presence of a basilar skull fracture creates a catastrophic risk of the tube penetrating through the fractured cribriform plate directly into the cranial vault and brain tissue.

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5. Thoracic Trauma, Open Pneumothorax & Tension Pneumothorax

Penetrating trauma between the clavicles and the navel (anteriorly, laterally, and posteriorly) presents severe respiratory compromise due to the disruption of thoracic negative pressure mechanics.

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|                    PATHOPHYSIOLOGY OF TENSION PNEUMOTHORAX              |
+-------------------------------------------------------------------------+
|  Penetrating Chest Wound / Lung Laceration                              |
|        |                                                                |
|        v                                                                |
|  One-Way Valve Effect: Air enters pleural space during inhalation       |
|  Trapped air cannot escape during exhalation                            |
|        |                                                                |
|        v                                                                |
|  Progressive Positive Intrapleural Pressure Increases                   |
|  Total collapse of ipsilateral lung                                     |
|        |                                                                |
|        v                                                                |
|  Mediastinal Shift to Contralateral Side                                |
|  Mechanical compression and kinking of VENA CAVA                        |
|        |                                                                |
|        v                                                                |
|  Loss of Venous Return (Preload) ---> OBSTRUCTIVE SHOCK ---> CARREST    |
+-------------------------------------------------------------------------+

Open Pneumothorax ("Sucking Chest Wound")

When a penetrating ballistic or stab wound breaches the chest wall, the normal negative pressure of the pleural cavity is lost. Atmospheric air is sucked into the chest cavity through the wound during inhalation rather than entering the lungs via the trachea.

• Clinical Signs: Visible bubbling or hissing from the chest wound, dyspnea, tachypnea, shallow breathing, and blood-tinged sputum.
• Immediate Intervention: Immediately apply a commercial vented chest seal. The vented seal features a one-way flutter valve that allows air and blood to escape during exhalation while preventing outside air from entering during inhalation.
• 360-Degree Thoracic Check: Always search for and treat both entry and exit wounds. A bullet that enters the anterior chest frequently exits through the back or axilla. If two wounds are present, apply a vented chest seal over both wounds.
• "Burping" the Chest Seal: If a casualty with an occlusive or vented chest seal exhibits worsening respiratory distress, tachycardia, or agitation, trapped air may have accumulated beneath the dressing. The officer must "burp" the seal by peeling back one edge of the adhesive dressing, wiping away clotted blood, allowing trapped pressurized air to vent, and resealing the dressing.

Tension Pneumothorax: Recognition & Management

Tension pneumothorax is the second leading cause of preventable combat death. It occurs when air leaks continuously into the pleural space from a lacerated lung or one-way chest defect without escaping. As positive pressure builds, it shifts the entire mediastinum toward the uninjured side, compressing the uninjured lung and kinking the superior and inferior vena cava, cutting off blood return to the heart.

• Clinical Manifestations:
  • Progressive, extreme respiratory distress and air hunger.
  • Markedly absent or diminished breath sounds on the affected side upon auscultation or visual chest rise asymmetry.
  • Tachycardia (heart rate >120 bpm) and tachypnea (respirations >30 bpm).
  • Subcutaneous Emphysema: Trapped air escaping into the subcutaneous tissue, creating a distinctive crackling, bubble-wrap sensation beneath the skin upon palpation.
  • Jugular Venous Distention (JVD): Distended neck veins resulting from obstructed venous return to the right atrium.
  • Cyanosis (late sign): Blue or purple discoloration of lips and nail beds.
  • Tracheal Deviation (Late, Pre-Terminal Sign): Physical shifting of the trachea in the neck notch away from the injured side.
• Field Treatment: In basic law enforcement first aid, if a chest seal is in place, burp the seal immediately. For certified tactical officers trained under agency medical direction in Needle Chest Decompression (NCD): insert a 14-gauge (or 10-gauge), 3.25-inch needle-catheter into the second intercostal space in the midclavicular line (2nd ICS MCL, just over the top of the third rib to avoid the subcostal neurovascular bundle) or the fourth/fifth intercostal space in the anterior axillary line (4th/5th ICS AAL). A sudden hiss of releasing pressurized air confirms successful decompression.

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6. CPR, Automated External Defibrillators (AED) & Traumatic Arrest

Traumatic vs. Medical Cardiac Arrest

AZPOST training draws a sharp tactical distinction between traumatic cardiac arrest and non-traumatic medical cardiac arrest:

• Traumatic Cardiac Arrest in Tactical Zones: Traumatic cardiac arrest resulting from catastrophic blast or penetrating ballistic trauma carries an operational survival rate of less than 1%. In Direct Threat Care (Hot Zone), CPR is strictly contraindicated. Performing CPR under hostile fire endangers the entire rescue team. In Indirect Threat Care, resuscitative efforts for traumatic arrest are limited to addressing reversible mechanical causes: sealing open chest wounds, bilateral needle decompression for tension pneumothorax, and stopping massive bleeding.
• Medical Cardiac Arrest: Sudden medical collapse (e.g., coronary occlusion, sudden cardiac arrest, electrical shock, drowning) requires immediate high-quality cardiopulmonary resuscitation (CPR) and rapid defibrillation.

[ Confirm Unresponsiveness & Absence of Breathing/Carotid Pulse (<10 sec) ]
                                | 
                                v
[ Call for AED & Initiate Immediate Compressions (Rate 100-120 bpm, Depth 2.0-2.4 in) ]
                                | 
                                v
[ Deliver 30 Compressions : 2 Rescue Breaths (Switch Rescuers Every 2 Minutes) ]
                                | 
                                v
[ Power ON AED ---> Attach Pads ---> Clear Bystanders ---> Deliver Shock if Advised ]
                                | 
                                v
[ Immediately Resume Compressions for 2 Minutes Prior to Re-Analysis ]

High-Quality CPR Metrics (AHA & AZPOST Standards)

Automated External Defibrillator (AED) Protocols

Defibrillation is the only effective therapy for shockable cardiac rhythms: Ventricular Fibrillation (V-Fib) and Pulseless Ventricular Tachycardia (V-Tach). Every minute of delay prior to defibrillation reduces the probability of survival by approximately 7% to 10%.

1. Power On: Activate the AED as soon as it arrives on scene.
2. Pad Attachment: Expose and wipe dry the victim's chest. Shave excessive chest hair if it prevents pad adhesion. Apply adult pads in the standard Anterolateral Configuration:
   • Upper right sternal pad: Right upper anterior chest, immediately below the clavicle.
   • Lower left lateral pad: Left lower rib cage, mid-axillary line, several inches below the armpit.
   • Pediatric Note: For infants and small children, use pediatric pads or place one pad on the center of the chest and the second on the center of the upper back (Anteroposterior Configuration).
3. Clear During Analysis: Loudly declare "Clear!" Ensure no rescuer touches or bumps the victim while the device analyzes the cardiac rhythm.
4. Shock Delivery: If a shock is advised, ensure all personnel are physically clear of the casualty and stretcher, press the flashing shock button, and immediately resume CPR beginning with chest compressions. Do not pause to re-check pulses immediately after shock delivery; compressions are required to restore perfusion to the stunned myocardium.

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7. Opioid Toxidrome & Intranasal Naloxone (Narcan) Protocols

The widespread proliferation of illicit synthetic opioids (fentanyl, carfentanil) across Arizona has made opioid overdose encounters a frequent emergency call for peace officers. Fentanyl is a synthetic mu-opioid receptor agonist that is 50 to 100 times more potent than morphine.

Pathophysiology of Opioid Overdose

Opioids cross the blood-brain barrier and bind selectively to mu-opioid receptors within the brainstem's respiratory control centers (the medulla oblongata). This binding blunts the body's chemoreceptors to carbon dioxide accumulation, suppressing the central respiratory drive and producing progressive hypoventilation, respiratory acidosis, anoxic brain injury, and fatal cardiac arrest.

The Clinical Opioid Overdose Triad

Recruits must rapidly identify the three classic clinical hallmarks of acute opioid toxidrome:

1. Profound Respiratory Depression: Severe bradypnea (respirations fewer than 6 to 8 breaths per minute), shallow tidal volume, agonal gasping, or complete apnea.
2. Pinpoint Pupils (Miosis): Pupillary constriction down to tiny "pinheads" that do not react or dilate in darkened lighting.
3. Altered Mental Status / Coma: Unresponsiveness to loud verbal commands and painful stimuli (sternal rubs), accompanied by central cyanosis (blue/ashen discoloration of the lips, tongue, and nail beds) and flaccid muscle tone.

Naloxone (Narcan) Administration Protocol (A.R.S. § 36-2266)

A.R.S. § 36-2266 authorizes trained Arizona peace officers to possess, carry, and administer Naloxone to individuals experiencing an apparent opioid-related overdose, granting statutory civil and criminal immunity when administered in good faith.

• Drug Mechanism: Naloxone is a pure competitive opioid antagonist. It has a significantly higher binding affinity for mu-opioid receptors than opioids, displacing the opioid molecules and temporarily restoring normal brainstem respiratory drive without causing psychoactive effects.
• Step-by-Step Field Administration:
  1. Assess Responsiveness & Airway: Verify unresponsiveness and respiratory failure. Ensure the mouth is free from foreign obstructions.
  2. Administer Dose 1: Insert the pre-packaged nasal spray nozzle into one nostril until the officer's fingers rest against the nostril base. Depress the plunger firmly to deliver the full 4 mg dose intranasally.
  3. Provide Active Ventilatory Support: While waiting for the medication to absorb, deliver rescue breaths using a bag-valve-mask (BVM) or pocket face mask with a one-way valve at a rate of one breath every 5 to 6 seconds (10 to 12 breaths per minute).
  4. The 2-to-3 Minute Evaluation Interval: Naloxone requires 2 to 3 minutes to cross the nasal mucosa into systemic circulation. If the patient does not exhibit adequate spontaneous breathing (at least 10 to 12 normal breaths per minute) after 2 to 3 minutes, administer a second 4 mg dose into the opposite nostril.
  5. Officer Safety Caution (Sudden Withdrawal): Naloxone precipitates immediate, acute opioid withdrawal. Patients frequently awaken suddenly, disoriented, combative, and violently nauseated. Officers must position themselves outside the patient's striking arc and prepare to manage projectile vomiting to prevent pulmonary aspiration.
  6. Half-Life Warning: The half-life of Naloxone is approximately 30 to 90 minutes, whereas potent synthetic opioids (like fentanyl) have half-lives extending 2 to 6 hours. When the Naloxone metabolizes and clears the receptors, the patient can relapse into fatal respiratory arrest. All overdose patients must be transported by EMS to an emergency medical facility regardless of temporary field recovery.

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8. Traumatic Shock & The Lethal Triad of Trauma

Shock is defined as systemic cellular hypoxia resulting from hypoperfusion—an imbalance between cellular oxygen delivery and cellular metabolic oxygen demand.

Stages of Hemorrhagic Shock

In trauma casualties, shock is predominantly hypovolemic (hemorrhagic), resulting from acute blood volume depletion:

• Class I Hemorrhage (Loss <15% / <750 mL): Heart rate normal (<100 bpm), blood pressure normal, mental status alert. Physiological compensation easily maintains perfusion.
• Class II Hemorrhage (Loss 15%–30% / 750–1500 mL): Resting tachycardia (100–120 bpm), tachypnea (20–30 bpm), peripheral vasoconstriction, cool/clammy skin, delayed capillary refill (>2 seconds), mild anxiety.
• Class III Hemorrhage (Loss 30%–40% / 1500–2000 mL): Marked tachycardia (>120 bpm), marked tachypnea (30–40 bpm), systolic hypotension (<90 mmHg), confusion, lethargy, oliguria.
• Class IV Hemorrhage (Loss >40% / >2000 mL): Severe tachycardia (>140 bpm) or bradycardia, barely perceptible or absent radial pulses, profound hypotension, coma, cold pale diaphoretic skin. Imminent mortality without surgical intervention.

[ PULSE CHECK ANATOMICAL THRESHOLDS (Estimated Systolic BP) ]
- Palpable Radial Pulse   ---> Systolic BP approximately >= 80 mmHg
- Palpable Femoral Pulse  ---> Systolic BP approximately >= 70 mmHg
- Palpable Carotid Pulse  ---> Systolic BP approximately >= 60 mmHg

Permissive Hypotension Doctrine

Historically, first responders aggressively administered intravenous saline to restore blood pressure to "normal" (120/80 mmHg). Modern tactical medicine enforces permissive hypotension (damage control resuscitation). Raising blood pressure prematurely with non-oxygen-carrying fluids dilutes clotting factors, cools core body temperature, and increases hydraulic pressure against newly formed vascular plugs, literally "popping the clot" and causing re-bleeding. Resuscitative efforts aim to maintain a palpable radial pulse (systolic BP around 80 to 90 mmHg) to ensure vital brain and coronary perfusion while avoiding disruptive clot disruption until surgical control is achieved.

The Lethal Triad of Trauma

Uncontrolled traumatic hemorrhage initiates a self-reinforcing physiological death spiral termed the Lethal Triad of Trauma:

                    [ HYPOTHERMIA ]
                     /            \
        Impairs clotting         Reduces myocardial
        cascade enzymes          contractility & perfusion
                   /                \
                  v                  v
[ COAGULOPATHY ] <==================> [ ACIDOSIS ]
Inability to form stable clots       Lactic acid buildup from hypoperfusion
Exacerbates blood loss               Decreases blood pH (<7.35)

1. Hypothermia: As blood volume decreases, heat production and circulation fall. When core body temperature drops below 95°F (35°C), the biochemical enzymes of the coagulation cascade become sluggish; at 90°F (32°C), coagulation activity decreases by more than 50%.
2. Acidosis: Poor tissue perfusion forces cells into anaerobic metabolism, producing massive quantities of lactic acid. Lactic acidosis lowers blood pH (<7.35), directly inhibiting clotting factor interaction and impairing cardiac contractility.
3. Coagulopathy: Blood loss depletes platelets and clotting proteins, which are further impaired by cold temperature and acidic blood. The body loses all ability to form stable fibrin clots, leading to massive microvascular oozing and fatal exsanguination.

[!IMPORTANT] Hypothermia Mitigation in Warm Climates: Officers must aggressively prevent hypothermia even in hot desert environments. Casualties lying on desert pavement, in shock, or with clothing cut away lose core heat rapidly through conduction and radiation. Peace officers must wrap casualties in reflective thermal hypothermia blankets (foil space blankets) immediately upon entering Indirect Threat Care.

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9. Desert Environmental Emergencies: Heat Illness

Patrol operations in Arizona expose peace officers, victims, and suspects to extreme desert environments where summer ambient temperatures consistently exceed 110°F to 120°F, asphalt radiant heat exceeds 150°F, and relative humidity is often under 10%. Furthermore, officers wearing 25 to 30 pounds of tactical gear and ballistic armor experience severe metabolic heat trapping.

+--------------------------------------------------------------------------+
|                      THE SPECTRUM OF HEAT ILLNESS                        |
+--------------------------------------------------------------------------+
|  HEAT CRAMPS                                                             |
|  - Normal core body temperature; painful skeletal muscle spasms          |
|  - Cause: Profuse sweating and acute electrolyte (sodium/potassium) loss |
|  - Management: Rest in shade, gentle passive stretching, electrolyte oral|
|    hydration. NEVER administer plain distilled water alone (hyponatremia)|
+--------------------------------------------------------------------------+
                                     | 
                                     v
+--------------------------------------------------------------------------+
|  HEAT EXHAUSTION                                                         |
|  - Core temperature elevated (<104°F / 40°C)                             |
|  - Profuse sweating; pale, cool, clammy skin; headache, dizziness, nausea|
|  - MENTAL STATUS IS NORMAL: Alert, oriented, understands questions      |
|  - Management: Loosen uniform/vest, move to air conditioning, elevate legs|
+--------------------------------------------------------------------------+
                                     | 
                                     v
+--------------------------------------------------------------------------+
|  HEAT STROKE (TRUE LIFE-THREATENING EMERGENCY)                           |
|  - CORE TEMPERATURE > 104°F (40°C)                                       |
|  - CENTRAL NERVOUS SYSTEM DYSFUNCTION / ALTERED MENTAL STATUS            |
|  - Confusion, delirium, combativeness, ataxia, seizures, coma            |
|  - Exertional vs Classical: Victim may still sweat heavily in exertional |
|  - Management: IMMEDIATE WHOLE-BODY AGGRESSIVE ACTIVE COOLING            |
+--------------------------------------------------------------------------+

Clinical Distinction: Heat Exhaustion vs. Heat Stroke

Exertional vs. Non-Exertional (Classical) Heat Stroke

Recruits frequently fail exam questions regarding sweating in heat stroke casualties:

• Classical (Non-Exertional) Heat Stroke: Typically affects sedentary elderly or pediatric individuals trapped in unventilated buildings or hot parked vehicles. Sweating mechanisms fail completely, leaving the skin hot, dry, and red.
• Exertional Heat Stroke: Occurs during strenuous physical exertion (e.g., violent foot pursuits, academy physical training, prolonged tactical operations in body armor). In exertional heat stroke, victims frequently continue to sweat profusely. The presence of active sweating does NOT rule out heat stroke. The definitive diagnostic criteria for heat stroke are a core temperature >104°F combined with altered mental status.

Field Treatment Protocol for Heat Stroke

1. Call ALS Transport Immediately: Request emergency priority paramedic response.
2. Strip Duty Gear: Immediately remove the subject's ballistic vest, duty belt, helmet, uniform shirt, and boots to stop external heat trapping.
3. Initiate Active Whole-Body Cooling:
   • Place ice packs or cold chemical compresses on the areas of greatest superficial blood flow: the groin, the axillae (armpits), and the lateral sides of the neck.
   • Douse the subject's entire body with cool water and aggressively fan them to facilitate rapid evaporative cooling.
   • If available, execute cold water immersion (submerging the torso in cold water up to the neck) while protecting the airway.
4. Airway Monitoring: If the subject exhibits seizures or altered consciousness, place them in the lateral recovery position. Never attempt to force oral fluids down the throat of an unconscious or confused individual, as this causes immediate aspiration into the lungs.

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10. High-Yield Exam Traps & Operational Application Scenario

High-Yield Exam Traps for Section 16.1

1. Direct Threat Care Scope: The ONLY medical intervention authorized under active fire is an arterial limb tourniquet. Recruits fail by choosing airway management, CPR, or wound packing during active hostile fire.
2. Tourniquet Removal: Peace officers never loosen or remove a tourniquet in the field. Removal must occur only under controlled surgical or advanced physician supervision.
3. NPA Contraindications: An NPA is strictly contraindicated when signs of a basilar skull fracture exist (raccoon eyes, Battle's sign, CSF from nose or ears).
4. Chest Wound Dressing: Open thoracic wounds require a vented chest seal with a one-way valve to vent air and prevent tension pneumothorax.
5. Heat Stroke Hallmark: Heat stroke is diagnosed by core temperature >104°F AND altered mental status, regardless of whether the casualty is actively sweating.
6. Naloxone Retest Interval: Officers must wait 2 to 3 minutes before administering a second dose of Naloxone, while delivering active rescue breathing.

Operational Application Scenario

Scenario: Officers respond to an active shooting at a warehouse complex in Tucson (ambient temperature 108°F). Officer Ramos and Officer Kim enter the structure. While advancing down an open breezeway, an armed suspect fires a rifle from a second-story catwalk, striking Officer Ramos in the left thigh. Ramos collapses onto the concrete, experiencing massive pulsatile bright red bleeding from the femoral artery.

• Phase 1: Direct Threat Care (Hot Zone): Officer Kim immediately returns suppressive rifle fire toward the suspect's catwalk, achieving fire superiority. Kim shouts at Ramos to crawl behind a nearby steel industrial dumpster. Ramos is unable to move due to femur fracturing. While maintaining suppressive fire, Kim deploys a smoke canister, advances under cover, grabs Ramos's drag handle, and pulls Ramos behind the steel dumpster. Under cover, Kim draws a commercial C-A-T tourniquet from Ramos's vest, loops it high and tight around Ramos's left upper thigh over uniform pants, pulls all slack from the band, and twists the windlass until the spurting bleeding ceases and the distal pulse is absent. Kim secures the windlass in the clip and marks "T = 1514" on Ramos's forehead.
• Phase 2: Indirect Threat Care (Warm Zone): Other responding units contain and eliminate the suspect. In the Warm Zone, Kim cuts away Ramos's pant leg, verifies no distal pulses, and notes a small entry wound in Ramos's lower right rib cage with bubbling blood. Kim immediately applies a commercial vented chest seal to the chest wound, logs an absence of exit wounds, and wraps Ramos in a reflective hypothermia blanket.
• Phase 3: Tactical Evacuation (Cold Zone): Transport teams arrive. Kim delivers a crisp MIST report to paramedics: "Officer Ramos, gunshot wound to upper left thigh and penetrating chest wound right lower thorax. Tourniquet applied at 1514 hours, bleeding stopped. Vented chest seal placed at 1518 hours. Alert, pulse 118 weak, respirations 24." Ramos is rapidly packaged on a rigid litter and transported directly to the regional Level 1 trauma center.