12.3 Emergency Preparedness, Contraindications, and Patient Safety Management in PFT Lab

12.3 Emergency Preparedness, Contraindications, and Patient Safety Management in PFT Lab

Patient safety in the diagnostic pulmonary function laboratory requires constant vigilance, comprehensive pre-test screening, rapid emergency response protocols, and strict adherence to medical oversight guidelines. Diagnostic pulmonary procedures—particularly maximal forced expiratory maneuvers, bronchial challenge testing, and cardiopulmonary exercise testing—impose substantial physiological stress on the cardiovascular, respiratory, cerebrovascular, and musculoskeletal systems. During a forced vital capacity (FVC) maneuver, intrathoracic and intra-abdominal pressures frequently surge above 100 to 150 cmH2O, transiently reducing venous return to the heart, elevating systemic blood pressure, increasing intraocular and intracranial pressures, and placing high tensile stress on surgical wounds and vascular structures. Pulmonary function technologists must be fully equipped to recognize absolute and relative contraindications, manage acute clinical emergencies, maintain emergency equipment, and execute life-support interventions under appropriate physician supervision.

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Pre-Test Screening: Absolute and Relative Contraindications

Before initiating any pulmonary function test, the technologist must conduct a thorough medical history review and targeted pre-test screening to ensure the patient can safely undergo testing.

There Are No Absolute Contraindications — but the Relative List Is Long

The 2019 ATS/ERS Standardization of Spirometry removed the concept of an absolute contraindication. Every condition below is relative: spirometry is not forbidden, but the ordering clinician weighs risk against benefit for that patient, potential contraindications are flagged on the requisition, and the technologist stops the maneuver the moment the patient reports pain. This was a substantive change, not a wording change — the pre-2019 "no testing within one month of a myocardial infarction" rule became within one week.

The relative contraindications are organized by the physiological stress that creates the risk:

1. Increased myocardial demand or blood pressure change: acute myocardial infarction within 1 week; systemic hypotension or severe hypertension; significant atrial or ventricular arrhythmia; noncompensated heart failure; uncontrolled pulmonary hypertension; acute cor pulmonale; clinically unstable pulmonary embolism; a history of syncope related to forced expiration or cough. Forced exhalation raises myocardial oxygen consumption and swings systemic pressure, and the Valsalva-like drop in venous return can unmask a syncope-prone patient.
2. Increased intracranial or intraocular pressure: cerebral aneurysm; brain surgery within 4 weeks; recent concussion with continuing symptoms; eye surgery within 1 week. Intraocular pressure spikes can disrupt a fresh surgical wound or displace an intraocular lens.
3. Increased sinus and middle ear pressure: sinus surgery, middle ear surgery, or middle ear infection within 1 week.
4. Increased intrathoracic and intra-abdominal pressure: presence of a pneumothorax; thoracic surgery within 4 weeks; abdominal surgery within 4 weeks; late-term pregnancy. Pressure surges risk wound dehiscence, air-leak recurrence, and uterine irritability.
5. Infection control: active or suspected transmissible respiratory or systemic infection, including tuberculosis, and physical conditions that predispose to transmission such as hemoptysis, significant secretions, or open oral sores.

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|        RELATIVE CONTRAINDICATIONS TO SPIROMETRY (ATS/ERS 2019) - TIMEFRAMES       |
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| Acute myocardial infarction ................................ within 1 WEEK        |
| Eye surgery ................................................ within 1 WEEK        |
| Sinus / middle ear surgery or infection .................... within 1 WEEK        |
| Brain surgery .............................................. within 4 WEEKS       |
| Thoracic surgery ........................................... within 4 WEEKS       |
| Abdominal surgery .......................................... within 4 WEEKS       |
| Pneumothorax ............................................... while present        |
| Late-term pregnancy ........................................ ongoing              |
| Active / suspected transmissible infection ................. while infectious     |
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| Aortic aneurysm was historically listed. The 2019 task force reviewed the         |
| available data (no adverse events in abdominal aneurysms 5-13 cm or thoracic      |
| aneurysms 5-8 cm) and did not retain it as a listed relative contraindication.    |
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Additional Conditions That Compromise Test Validity

Separate from the safety list above, several conditions do not create physiological danger but do prevent a valid maximal effort or corrupt the measurement. These belong in the technologist's pre-test screen and in the report comments:

1. Recent Stroke or TIA: beyond the intracranial-pressure concern already covered above, facial muscle weakness frequently prevents an adequate lip seal around the mouthpiece, producing perioral leaks that mimic early termination.
2. Late Third-Trimester Pregnancy: Elevated intra-abdominal pressure during forced maneuvers may stimulate uterine contractions, precipitate premature rupture of membranes, or induce pelvic pain.
3. Perforated Tympanic Membrane (Eardrum): During body plethysmography lung volume measurements, an unsealed perforated eardrum permits pressure communication between the middle ear and the atmosphere, causing ear pain, vertigo, and significant inaccuracy in box pressure / shutter pressure measurements (unless the ear canal is securely plugged with an approved foam earplug).
4. Nausea, Vomiting, Acute Diarrhea, or Abdominal Pain: severe discomfort prevents a valid maximal effort and creates aspiration and infection control risk.
5. Chest, Oral, or Facial Pain; Stress Incontinence; Dementia or Confusional State: the 2019 statement lists these as conditions that predispose to suboptimal results rather than as safety contraindications. Document them so the interpreting physician knows why a session graded poorly.

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Emergency Protocol 1: Vasovagal Syncope & Presyncope Management

Vasovagal (neurocardiogenic) syncope is one of the most common acute adverse events encountered during spirometry testing.

Pathophysiology

When a patient performs a prolonged, forceful exhalation against airway resistance (similar to a Valsalva maneuver), high intrathoracic pressure compresses the vena cava, reducing venous blood return to the right heart. This leads to a sudden drop in cardiac output. Upon cessation of exhalation, parasympathetic vagal tone spikes while sympathetic tone declines, resulting in acute bradycardia, systemic vasodilation, profound hypotension, and sudden loss of cerebral perfusion.

Step-by-Step Clinical Action Plan

1. Immediate Termination: At the first sign of presyncope (sudden pallor, diaphoresis, lightheadedness, yawning, blurred vision, or slurred speech), stop testing immediately and remove the mouthpiece from the patient's mouth.
2. Positioning (Supine & Trendelenburg): Immediately assist the patient into a flat, supine position. Elevate the patient's legs 15 to 30 degrees above heart level (Trendelenburg position) to facilitate passive venous return from the lower extremities to the central circulation and restore cerebral blood flow.
3. Airway & Vital Signs Assessment: Verify airway patency, confirm spontaneous breathing, and assess carotid and radial pulses. Attach continuous pulse oximetry (SpO2) and measure blood pressure.
4. Oxygen Administration: If SpO2 drops below 92% or if the patient remains symptomatic, administer supplemental oxygen via nasal cannula at 2 to 4 L/min or via simple mask.
5. Monitoring & Recovery: Maintain the patient in the supine position until vital signs (BP and heart rate) return to baseline and full mental orientation is restored. Never allow the patient to sit up or stand rapidly, which could trigger secondary orthostatic syncope.

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Emergency Protocol 2: Severe Acute Bronchospasm Protocol

Diagnostic testing can inadvertently trigger severe bronchospasm, particularly in patients with hyperreactive airways, severe uncontrolled asthma, or during bronchial challenge testing.

Clinical Signs & Symptoms

• Sudden onset of severe dyspnea, chest tightness, and audible expiratory wheezing or silent chest.
• Abrupt decline in FEV1 (> 20% drop from baseline).
• Accessory muscle use, tachypnea (> 30 breaths/min), and SpO2 desaturation (< 90%).

Step-by-Step Bronchospasm Management Protocol

1. Stop Testing Immediately: Discontinue all diagnostic maneuvers and reassure the patient to reduce anxiety.
2. Positioning: Place the patient in an upright, high-Fowler's position (sitting upright at 90 degrees) to optimize diaphragm excursion and reduce the work of breathing.
3. Administer Short-Acting Beta-2 Agonist (SABA):
   • Nebulizer Route: Administer Albuterol 2.5 mg diluted in 3 mL of normal saline via a compressed air/O2 jet nebulizer at a flow rate of 6 to 8 L/min over 5 to 10 minutes.
   • Metered-Dose Inhaler (MDI) Route: Administer 4 to 8 puffs of Albuterol MDI (90 mcg/puff) via a valved holding chamber (spacer), allowing 1 minute between individual puffs.
4. Oxygenation & Monitoring: Connect pulse oximetry continuously. Administer supplemental oxygen to maintain SpO2 $\ge 92%$.
5. Re-Evaluation: Re-assess breath sounds, heart rate, respiratory rate, and SpO2 after 15 minutes. If bronchospasm persists, administer a second dose of SABA.
6. Escalation / Emergency Call: If the patient displays severe respiratory distress, cyanosis, altered mental status, or failing SpO2 despite dual bronchodilator therapy, activate Code Blue / Emergency Response Team immediately and prepare for advanced airway management.

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Emergency Protocol 3: Chest Pain, Cardiac Arrest, and Code Blue Protocols

During maximal exertion or forced exhalation, patients with unrecognized coronary artery disease may experience acute myocardial ischemia or cardiac arrest.

Acute Chest Pain Protocol

1. Stop Testing Immediately: Place the patient in a comfortable sitting position.
2. Assessment: Assess blood pressure, pulse, heart rate rhythm, and SpO2. Inquire about pain characteristics (radiation to jaw/arm, crushing quality, diaphoresis, nausea).
3. Oxygen & Emergency Contact: Administer supplemental O2. Contact the PFT laboratory medical director or emergency response team immediately. Prepare sublingual nitroglycerin and aspirin if authorized by physician protocol.

Cardiac Arrest & Code Blue Protocol

If a patient becomes unresponsive, stops breathing (or demonstrates agonal gasping), and lacks a central pulse within 10 seconds:

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|                         CARDIAC ARREST / CODE BLUE PROTOCOL                       |
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| 1. RECOGNIZE ARREST: Confirm unresponsiveness and lack of central pulse (<10 sec).|
| 2. CALL FOR HELP: Activate Code Blue / Emergency Medical Services (EMS) instantly.|
| 3. HIGH-QUALITY CPR:                                                              |
|    - Push hard and fast: 100–120 compressions/minute.                             |
|    - Compression depth: 2 to 2.4 inches (5 to 6 cm) in adults.                    |
|    - Allow complete chest recoil between compressions.                            |
|    - Minimize interruptions in compressions to < 10 seconds.                      |
| 4. ATTACH AED / DEFIBRILLATOR:                                                    |
|    - Turn on AED, attach adult pads to bare chest immediately.                    |
|    - Analyze rhythm: Shockable (VF / Pulseless VT) vs. Non-Shockable (Asystole/PEA).|
|    - Deliver shock if advised, immediately resume chest compressions for 2 min.   |
| 5. ADVANCED LIFE SUPPORT (ACLS):                                                  |
|    - Assist ACLS team with high-flow O2, bag-valve-mask (BVM) ventilation,        |
|      advanced airway placement, and IV/IO resuscitation drugs (Epinephrine 1 mg). |
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Required PFT Laboratory Emergency Equipment

Every diagnostic pulmonary function laboratory must maintain fully operational emergency equipment that undergoes daily verification and mandatory periodic inspections. Required emergency equipment includes:

1. Oxygen Supply Systems: Dual high-pressure wall oxygen outlets supplemented by portable, fully pressurized E-cylinders equipped with calibrated pressure regulators, flowmeters (0–15 L/min), nasal cannulas, and non-rebreather masks.
2. Suction Apparatus: Continuous wall or portable electrical suction unit capable of generating subatmospheric pressure > 150 mmHg, equipped with rigid Yankauer suction tips and flexible suction catheters for airway clearance.
3. Automated External Defibrillator (AED) / Crash Cart: Dedicated, rapidly accessible resuscitation cart stocked with:
   • Adult AED with spare electrode pads.
   • Bag-Valve-Mask (BVM) manual resuscitators with clear adult face masks.
   • Oropharyngeal (OPA) and Nasopharyngeal (NPA) airways.
   • Intravenous (IV) access supplies, normal saline IV fluids, and tubing.
   • Emergency ACLS medications: Epinephrine 1 mg/10 mL, Atropine, Amiodarone, Sublingual Nitroglycerin, Aspirin, IV Corticosteroids (Methylprednisolone), and Subcutaneous Epinephrine.
4. Emergency Rescue Medications & Nebulizers: Short-acting beta-2 agonist (Albuterol) solutions, anticholinergic solutions (Ipratropium bromide), jet nebulizer kits, and valved holding chambers.
5. Emergency Call System / Pull Cords: Wall-mounted emergency call buttons or pull cords located in every testing room, plethysmography booth area, and patient restroom, wired directly to the hospital central emergency switchboard or nursing station.

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Technologist Credentials & Physician Supervision Rules

Patient safety and legal regulatory compliance require specific professional credentials and medical director supervision levels.

Technologist BLS and ACLS Certification Mandates

• Basic Life Support (BLS): All pulmonary function technologists performing patient testing must hold current American Heart Association (AHA) or American Red Cross BLS Certification for Healthcare Providers, renewed every 2 years.
• Advanced Cardiac Life Support (ACLS): ACLS certification is strongly recommended for all diagnostic staff and is mandatory for technologists conducting high-risk procedures, including Cardiopulmonary Exercise Testing (CPET) and Methacholine Challenge Testing.

Physician Supervision Requirements

The Centers for Medicare & Medicaid Services (CMS) and ATS guidelines define two distinct levels of physician supervision for pulmonary diagnostic testing:

1. Direct Physician Supervision:
   • Definition: The supervising physician must be physically present in the diagnostic suite, immediately available, and able to provide assistance and direction throughout the performance of the procedure.
   • Mandatory Procedures: Methacholine / Bronchial Challenge Testing (CPT 94070) and Complex Cardiopulmonary Exercise Testing (CPT 94621).
2. General / Immediate Availability Supervision:
   • Definition: The procedure is performed under the physician's overall direction and control, but the physician's physical presence is not required in the room during testing; however, the physician must be in the building and reachable within 1 to 2 minutes.
   • Mandatory Procedures: Routine spirometry (94010/94060), plethysmography (94726), and DLCO (94729) in stable outpatients.