4.2 Respiratory Disorders & Airway Management

Respiratory Disorders & Airway Management

Optimal gas exchange requires the harmonious coordination of alveolar ventilation, pulmonary perfusion, and neural respiratory drive. Respiratory failure represents one of the most frequent pathways to critical decompensation in medical-surgical patients. Registered nurses must possess rigorous clinical knowledge of chronic obstructive diseases, acute airway obstruction, pulmonary infectious processes, thromboembolic emergencies, and complex mechanical airway devices to deliver safe, decisive care.

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Chronic Obstructive Pulmonary Disease (COPD)

Chronic Obstructive Pulmonary Disease (COPD) is a progressive, partially reversible airflow limitation caused by a chronic inflammatory response of the airways and lung parenchyma to noxious particles or gases, predominantly cigarette smoke. It encompasses two primary pathological phenotypes that frequently coexist:

Pathophysiological Phenotypes

• Emphysema ('Pink Puffers'): Characterized by abnormal, permanent enlargement of the airspaces distal to terminal bronchioles accompanied by destruction of alveolar walls and capillary beds without obvious fibrosis. The loss of pulmonary elastin leads to diminished elastic recoil and premature dynamic collapse of small bronchioles during exhalation. Trapped air causes hyperinflation, flattening of the diaphragm, and an increased anterior-posterior chest diameter (barrel chest, 1:1 AP-to-lateral ratio). Patients present with marked dyspnea, tachypnea, prolonged expiratory phase, pursed-lip breathing, hyperresonance to chest percussion, distant heart and breath sounds, and a lean, cachectic appearance due to the immense metabolic caloric cost of labored breathing.
• Chronic Bronchitis ('Blue Bloaters'): Defined clinically as a chronic productive cough present for at least 3 consecutive months in each of 2 successive years, in the absence of other cardiopulmonary conditions. Characterized by chronic airway inflammation, bronchial epithelial hypertrophy, submucosal goblet cell hyperplasia, and excessive production of tenacious mucus. Mucociliary clearance is severely impaired. The resulting ventilation-perfusion (V/Q) mismatch causes profound arterial hypoxemia and hypercapnia. Chronic alveolar hypoxia triggers pulmonary arteriolar vasoconstriction, leading to pulmonary arterial hypertension, right ventricular hypertrophy, and right-sided heart failure (cor pulmonale). Patients present with cyanosis, chronic cough with copious sputum, crackles and wheezes on auscultation, peripheral dependent pitting edema, and jugular venous distention.

Oxygen-Induced Hypercapnia & Controlled Oxygen Therapy

In COPD, airflow obstruction and limited effective alveolar ventilation can cause chronic carbon dioxide retention. Excessive oxygen can further increase PaCO2, chiefly through worsening ventilation-perfusion matching as hypoxic pulmonary vasoconstriction reverses. Reduced ventilation and the Haldane effect can also contribute. Breathing is not simply dependent on maintaining hypoxemia.

• Oxygen Delivery Principles: Titrate oxygen and monitor respiratory effort, consciousness and blood gases. Recheck gases within 30 to 60 minutes, or immediately if the patient deteriorates, to detect rising PaCO2 or falling pH. Increasing lethargy, confusion, asterixis or reduced ventilation requires urgent assessment for hypercapnic respiratory failure.
• Clinical Saturation Target: Titrate supplemental oxygen to achieve a target SpO2 of 88% to 92% (corresponding to a PaO2 of approximately 60 to 70 mmHg).
• Delivery Device of Choice: The Venturi mask is the gold standard device for delivering controlled, precise fractions of inspired oxygen (FiO2 24%, 28%, 31%, 35%, 40%) regardless of the patient's respiratory rate, tidal volume, or ventilatory pattern. Alternatively, low-flow nasal cannula at 1 to 2 L/min may be utilized.
• Critical Clinical Rule: NEVER withhold oxygen during severe, life-threatening hypoxemia or critical instability. Restore oxygenation, obtain urgent blood gases and support ventilation as needed. If hypercapnic acidosis persists despite treatment, prepare non-invasive ventilation or emergency intubation according to the patient’s condition; do not abruptly stop needed oxygen.

Evidence-Based Nursing Interventions in COPD

1. Pursed-Lip Breathing Technique: Teach the patient to inhale slowly through the nose for 2 seconds with the mouth closed, then exhale slowly and gently through pursed lips (as if blowing out a candle) for 4 seconds (a 1:2 inspiration-to-expiration ratio). This technique creates positive backpressure inside the tracheobronchial tree, preventing bronchiolar collapse during exhalation, prolonging expiratory time, and promoting alveolar emptying.
2. Tripod Positioning: Instruct the patient to sit leaning forward with arms resting on an overbed table or knees. This biomechanically optimizes diaphragm descent, recruits accessory muscles (scalene, sternocleidomastoid, pectoralis minor), and increases thoracic cavity expansion.
3. Pulmonary Toilet & Hydration: Encourage adequate oral hydration, often 2 to 3 L/day if appropriate; individualize for cardiac or renal disease and fluid restrictions. Teach huff coughing to mobilize mucus without prolonged exhausting coughs.
4. Nutritional Optimization & Energy Conservation: Advise small, frequent, nutrient-dense, high-protein, moderate-fat meals. High-carbohydrate meals should be moderated because carbohydrate metabolism yields a high respiratory quotient, producing excessive carbon dioxide that the diseased lungs struggle to eliminate.
5. Smoking Cessation: The single most effective clinical intervention capable of halting the accelerated decline in forced expiratory volume in 1 second (FEV1).

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Asthma: Pathophysiology, Step-Wise Pharmacotherapy & Emergency Surveillance

Asthma is a heterogeneous chronic inflammatory disease of the conducting airways characterized by bronchial hyperresponsiveness, mucosal edema, chronic airway remodeling, and reversible airflow limitation.

Cellular Pathophysiology & Triggers

In response to an inhaled allergen or environmental trigger (dust mites, pollen, pet dander, tobacco smoke, cold air, exercise, viral respiratory infections, aspirin, or non-selective beta-blockers), sensitized immunoglobulin E (IgE) antibodies cross-link on the surface of airway mast cells. This triggers immediate degranulation, releasing preformed and newly synthesized inflammatory mediators: histamine, leukotrienes (C4, D4, E4), prostaglandin D2, and platelet-activating factor. This acute phase induces rapid smooth muscle contraction (bronchospasm), vascular engorgement, and mucosal edema. A late-phase reaction develops 4 to 12 hours later, driven by eosinophil, basophil, and T-helper 2 (Th2) lymphocyte recruitment, leading to epithelial desquamation, mucus plug formation, and persistent airway hyperreactivity.

Step-Wise Pharmacological Management

• Short-Acting Beta-2 Agonists (SABA; Albuterol, Levalbuterol): First-line rescue medications for acute bronchospasm. Stimulate beta-2 adrenergic receptors on bronchial smooth muscle, activating adenylate cyclase and increasing intracellular cyclic adenosine monophosphate (cAMP) to induce rapid smooth muscle relaxation within 5 to 15 minutes. Nursing considerations: Monitor for anticipated side effects, including sinus tachycardia, skeletal muscle tremor, palpitations, nervousness, and transient hypokalemia (due to intracellular potassium shifting).
• Inhaled Corticosteroids (ICS; Fluticasone, Budesonide, Beclomethasone): Cornerstone of long-term controller therapy. Suppress transcription of inflammatory cytokines, downregulate eosinophil activation, and reduce microvascular permeability. Essential Patient Education: Instruct the patient to rinse their mouth thoroughly with water and spit it out after every ICS inhalation, and use a valved holding chamber (spacer), to prevent local adverse effects: oropharyngeal candidiasis (thrush) and dysphonia (hoarseness).
• Long-Acting Beta-2 Agonists (LABA; Salmeterol, Formoterol): Provide bronchodilation lasting >= 12 hours. Black Box Warning: LABAs must NEVER be used as monotherapy for asthma. Using a LABA without an accompanying ICS relieves symptoms without treating underlying airway inflammation, markedly increasing the risk of severe, fatal asthma exacerbations. Always prescribe as combination therapy (e.g., Fluticasone/Salmeterol, Budesonide/Formoterol).
• Systemic Corticosteroids (Prednisone, Methylprednisolone): Indicated for moderate-to-severe acute exacerbations. Accelerate resolution of airflow obstruction and prevent relapse. Nursing considerations: Short-term adverse effects include hyperglycemia, fluid retention, mood lability, and insomnia; long-term use risks adrenal suppression, osteoporosis, peptic ulcer disease, and immunosuppression.
• Leukotriene Receptor Antagonists (LTRA; Montelukast, Zafirlukast): Oral controller agents that block cysteinyl leukotriene receptors, attenuating bronchoconstriction and mucus secretion. Useful in aspirin-sensitive asthma and allergic rhinitis.

Peak Expiratory Flow (PEF) Monitoring & Asthma Action Plan

The peak flow meter measures the maximum speed of expiration (liters per minute) and provides an objective assessment of airway resistance relative to the patient's personal best:

• Green Zone (80% to 100% of Personal Best): Signals excellent control. No active wheezing, shortness of breath, or nocturnal awakening. Continue routine baseline maintenance controller medications.
• Yellow Zone (50% to 79% of Personal Best): Signals caution and acute airway narrowing. Symptoms include cough, mild wheezing, chest tightness, or nocturnal symptoms. Action: Administer prescribed quick-relief SABA (2 to 4 puffs via MDI with spacer), reassess peak flow in 20 to 30 minutes, and initiate temporary step-up in controller therapy per the written action plan.
• Red Zone (< 50% of Personal Best): Signals a medical emergency with severe airflow limitation. Extreme dyspnea, retractions, difficulty speaking. Action: Administer rescue SABA immediately, take oral systemic corticosteroids, and seek emergency hospital medical evaluation immediately.

Status Asthmaticus & The 'Silent Chest' Phenomenon

Status asthmaticus is a severe, life-threatening asthma exacerbation that is refractory to standard intensive bronchodilator and corticosteroid therapy. The patient presents with marked diaphoresis, inability to speak in complete sentences (one-word or two-word dyspnea), intercostal and supraclavicular retractions, pulsus paradoxus (> 10 mmHg fall in systolic blood pressure during inspiration), and severe agitation.

• The 'Silent Chest' Sign: In an acutely dyspneic, tachypneic asthma patient, the sudden cessation of audible wheezing accompanied by severely diminished or absent breath sounds is an ominous, life-threatening clinical sign. It does NOT indicate clinical improvement. Rather, it indicates that airflow obstruction has become so profound and airway resistance so extreme that the patient can no longer move sufficient air to generate turbulence and produce wheezing sounds. The respiratory muscles are fatigued. This heralds impending respiratory arrest and death, mandating immediate preparation for emergency endotracheal intubation and mechanical ventilation.
• Arterial Blood Gas Progression in Asthma:
  • Early Exacerbation: Hyperventilation produces acute respiratory alkalosis with hypoxemia (low PaCO2 < 35 mmHg, elevated pH > 7.45, low PaO2).
  • Severe Decompensation: As muscle fatigue sets in, the PaCO2 normalizes (35 to 45 mmHg). A 'normal' PaCO2 in a severely tachypneic patient is an alarming sign of imminent respiratory exhaustion.
  • Late Arrest: Progression to severe respiratory acidosis (elevated PaCO2 > 50 mmHg, low pH < 7.30) due to alveolar hypoventilation.

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Pneumonia: Classification, Assessment & Pulmonary Protocols

Pneumonia is an acute infection of the pulmonary parenchymal tissue (alveoli and bronchioles) resulting in inflammatory exudate accumulation that consolidates the lung and impairs alveolar-capillary gas diffusion.

Epidemiological Classification

• Community-Acquired Pneumonia (CAP): Acquired outside of healthcare facilities or diagnosed within the first 48 hours of hospital admission. Most common microbial etiology: Streptococcus pneumoniae (pneumococcus), Haemophilus influenzae, and Mycoplasma pneumoniae.
• Hospital-Acquired Pneumonia (HAP): Pneumonia developing >= 48 hours after hospital admission, not incubating at the time of admission. Frequently caused by multidrug-resistant pathogens: Pseudomonas aeruginosa, Methicillin-Resistant Staphylococcus aureus (MRSA), and Klebsiella pneumoniae.
• Ventilator-Associated Pneumonia (VAP): A distinct subtype of HAP arising >= 48 to 72 hours following endotracheal intubation. Prevented using the evidence-based VAP Bundle: elevate head of bed 30 to 45 degrees, daily sedative interruptions ('sedation vacations') and spontaneous breathing trials, regular oral care with toothbrushing rather than routine chlorhexidine mouthwash, subglottic secretion drainage when indicated, and assessment for early liberation from ventilation. Provide stress-ulcer and venous-thromboembolism prophylaxis for their separate clinical indications; stress-ulcer prophylaxis does not prevent VAP.

Clinical Presentation & Diagnostic Signs

• Classic Symptoms: High fever, rigors (shaking chills), pleuritic chest pain aggravated by deep inspiration or coughing, tachypnea, tachycardia, dyspnea, and productive cough with purulent, green, or characteristically rust-colored sputum (pathognomonic for pneumococcal infection).
• Physical Examination of Consolidated Lung:
  • Localized inspiratory crackles (rales) over the affected lobe.
  • Bronchial breath sounds auscultated over peripheral lung fields (harsh, high-pitched tubular sounds with prolonged expiration, caused by sound conducting rapidly through consolidated, fluid-filled parenchyma rather than air-filled alveoli).
  • Dullness to percussion over the consolidated lobe.
  • Increased tactile fremitus (palpable chest wall vibrations during vocalization of 'ninety-nine').
  • Egophony: Auscultating the chest while the patient vocalizes the letter 'E'; consolidation transmits the sound as an open, nasal 'A'.
• Atypical Presentation in Geriatric Patients: Older adult patients frequently lack classic febrile responses and respiratory symptoms. Instead, they present with acute delirium, altered mental status, confusion, generalized weakness, anorexia, and falls.

Sputum Culture & Antimicrobial Golden Rule

Obtain prescribed microbiological samples promptly, preferably before antibiotics, when indicated by severity and resistant-pathogen risk. Routine sputum and blood cultures are unnecessary for low-severity CAP. Do not wait for sputum if this would delay urgent treatment: in septic shock or probable/definite sepsis, give antimicrobials immediately, ideally within 1 hour. An unsuccessful culture attempt is not a four-hour waiting period.

CURB-65 Severity Scoring System

The CURB-65 score is a validated clinical prediction rule used to determine mortality risk and the appropriate clinical setting for treatment:

• C (Confusion): New-onset mental confusion (abbreviated mental test score <= 8) (1 point)
• U (Urea): Blood urea nitrogen (BUN) > 19 mg/dL (> 7 mmol/L) (1 point)
• R (Respiratory Rate): >= 30 breaths/min (1 point)
• B (Blood Pressure): Systolic BP < 90 mmHg OR Diastolic BP <= 60 mmHg (1 point)
• 65 (Age): >= 65 years (1 point)
• Clinical Decision Triage:
  • Score 0 to 1: Low risk (< 3% mortality); candidate for safe outpatient management.
  • Score 2: Moderate risk (~9% mortality); inpatient hospital admission or closely monitored outpatient care.
  • Score 3 to 5: High risk; arrange urgent inpatient care and assess whether critical care is required. A score of 4 or 5 does not alone mandate ICU admission: use clinical judgment, organ support needs, comorbidities and the patient’s goals of care.

Nursing Interventions & Pulmonary Toilet

1. Hydration: Encourage oral fluids as tolerated; individualize intake for volume status, cardiac/renal disease and prescribed restrictions. Give IV fluids when clinically indicated, with reassessment for overload.
2. Incentive Spirometry: Instruct the patient to perform sustained maximal inhalations using the incentive spirometer 10 times every hour while awake. The patient must seal their lips around the mouthpiece, inhale slowly and deeply to elevate the cylinder, hold their breath for 3 to 5 seconds at peak inhalation, and exhale quietly. Follow with directed coughing.
3. Positioning: Maintain head of bed elevated 30 to 45 degrees (semi-Fowler's to high-Fowler's). When unilateral pneumonia is present, position the patient with the 'good lung down' (dependent position). Gravity enhances blood flow to the well-ventilated dependent lung, optimizing ventilation-perfusion matching and systemic oxygenation.

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Pulmonary Embolism (PE): Virchow's Triad & Rapid Escalation

Pulmonary embolism (PE) is the mechanical occlusion of one or more pulmonary arterial branches by a thrombus, tumor, air bubble, or fat globule. Over 90% of pulmonary emboli originate as deep vein thrombosis (DVT) in the deep veins of the lower extremities or pelvis.

Virchow's Triad

The three predisposing pathophysiological factors that lead to intravascular thrombosis:

1. Venous Stasis: Immobility, prolonged bed rest, major orthopedic surgery (hip/knee arthroplasty), stroke, paralysis, long-haul air travel, obesity, pregnancy.
2. Hypercoagulability: Active malignancy, inherited thrombophilias (Factor V Leiden mutation, protein C or S deficiency, antithrombin III deficiency), antiphospholipid syndrome, oral contraceptive or hormone replacement therapy, sepsis, severe trauma.
3. Endothelial Vascular Injury: Direct vessel trauma, intravenous catheterization, central venous lines, orthopedic fractures, atherosclerosis, smoking.

Clinical Presentation

• Classic presenting symptoms include the sudden onset of unexplained dyspnea, rapid tachypnea (> 20 breaths/min), pleuritic chest pain (sharp, stabbing pain aggravated by inspiration), resting sinus tachycardia (> 100 bpm), dry cough, apprehension or a pervasive feeling of impending doom, diaphoresis, and syncope.
• Hemoptysis, pleural friction rub, and fever occur if pulmonary infarction develops.
• High-Risk PE: Major pulmonary vascular obstruction can cause acute RV failure, reduced LV filling, obstructive shock, and cardiac arrest. A saddle embolus describes clot location at the pulmonary artery bifurcation; hemodynamic instability, not location alone, determines the emergency risk.

Diagnostic Protocols

• D-Dimer Assay: Measures fibrin degradation products produced during endogenous fibrinolysis. Extremely high sensitivity (> 95%), but low specificity. A normal D-dimer (< 500 ng/mL) reliably rules out PE in low-to-moderate probability patients. Elevated D-dimer confirms clot breakdown but requires confirmatory imaging.
• Computed Tomography Pulmonary Angiography (CTPA): The definitive gold standard diagnostic imaging modality. Rapidly visualizes intraluminal filling defects in pulmonary arterial branches. Nursing priority: Screen for iodinated contrast allergy and assess renal function (serum creatinine, eGFR).
• Ventilation-Perfusion (V/Q) Lung Scan: An alternative when CTPA is unsuitable, such as with severe renal impairment or major iodinated-contrast allergy. During pregnancy, either CTPA or V/Q imaging may be appropriate under the pregnancy-specific diagnostic pathway. Identifies characteristic mismatched defects (areas of normal ventilation with absent perfusion).

Immediate Emergency Nursing Priorities

1. Place the patient in high-Fowler's position immediately to maximize thoracic excursion.
2. Give supplemental oxygen for hypoxemia and titrate toward SpO2 94% to 98%, or 88% to 92% if at risk of hypercapnic respiratory failure. Profound hypoxemia or critical instability may require initial high-concentration oxygen while urgent support is arranged.
3. Establish continuous pulse oximetry, 12-lead ECG, and telemetry (watch for sinus tachycardia, S1Q3T3 pattern, or right bundle branch block).
4. Obtain stat arterial blood gases (ABGs), troponin, and BNP (elevations indicate right ventricular strain).
5. Establish two wide-bore IV access lines immediately.
6. Anticoagulation: Initiate immediate parenteral anticoagulation to prevent thrombus extension and promote endogenous clot lysis:
   • Unfractionated Heparin (UFH): IV bolus (80 units/kg) followed by continuous infusion (18 units/kg/hr), titrated to an activated partial thromboplastin time (aPTT of 1.5 to 2.5 times the control, typically 60 to 80 seconds) or anti-Xa levels (0.3 to 0.7 units/mL).
   • Low-Molecular-Weight Heparin (LMWH; Enoxaparin): 1 mg/kg subcutaneously every 12 hours. Does not require routine aPTT monitoring; monitored with anti-Xa levels in renal failure or morbid obesity.
7. Systemic Fibrinolytic Therapy: For massive, hemodynamically unstable PE with refractory hypotension (systolic BP < 90 mmHg) or cardiac arrest, administer recombinant tissue plasminogen activator (Alteplase / tPA 100 mg IV over 2 hours) in the absence of absolute contraindications (active bleeding, recent stroke, intracranial pathology).
8. Bleeding & Heparin-Induced Thrombocytopenia (HIT) Precautions: Monitor platelet counts daily. A drop in platelet count of > 50% from baseline or < 100,000/mm³ between days 5 and 10 of heparin therapy strongly suggests HIT, requiring immediate cessation of all heparin products and initiation of a non-heparin direct thrombin inhibitor (argatroban).

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Chest Tube Drainage Systems & Pleural Space Troubleshooting

Chest tube thoracostomy is performed to evacuate abnormal collections of air (pneumothorax), blood (hemothorax), fluid (pleural effusion), or purulent exudate (empyema) from the pleural space, restoring negative intrapleural pressure (-4 to -8 cmH2O) and allowing the collapsed lung to re-expand.

Anatomy of the Three-Chamber Drainage System

Modern closed-chest drainage systems combine three discrete functional chambers within a single disposable unit:

Critical Chest Tube Emergency Protocols

1. Accidental Tube Dislodgement from the Patient's Chest:
   • If the chest tube is accidentally pulled out of the thoracic wall, NEVER attempt to reinsert it.
   • Immediate Action: Call for help and cover the site promptly with the dressing specified for the drain indication and local emergency protocol. Guidance distinguishes an occlusive dressing for pleural-fluid drainage from gauze taped on three sides for pneumothorax.
   • Rationale: Prevent air entry while urgently assessing breathing and arranging clinical review. Do not teach that every occlusive dressing inevitably causes tension pneumothorax; continue close respiratory observation after any drain dislodgement.
   • Assess lung sounds immediately, monitor for tracheal deviation, apply oxygen, and call the physician stat.
2. Accidental Tubing Disconnection from the Drainage Unit:
   • If the drainage unit cracks, breaks, or disconnects, call for help and promptly restore safe drainage; do not leave the tube clamped.
   • Immediate Action: Immediately submerge the open distal end of the chest tube 2 to 4 cm (1 to 2 inches) below the surface of a container of sterile water or sterile saline.
   • Rationale: Submerging the tube creates an emergency water seal, allowing air and fluid to escape while preventing atmospheric air entry. Keep the container below the level of the patient's chest. Obtain a new sterile drainage unit, connect it to the chest tube, and resume prescribed suction.
3. Chest Tube Clamping Rules:
   • Do not routinely clamp a chest tube during transport or ambulation. Prolonged clamping can trap air and cause tension pneumothorax.
   • Avoid clamping a bubbling drain unless a specialist directs a specific, closely supervised intervention. Brief clamping during system replacement or a prescribed trial requires the applicable protocol and immediate reassessment.
   • Pleural-fluid drainage may need to be paused for repetitive cough or chest pain to prevent re-expansion pulmonary edema; obtain urgent clinical review.
4. Systematic Air Leak Troubleshooting:
   • With continuous water-seal bubbling, assess the patient first, inspect the insertion site and visible tubing connections, and notify the responsible clinician.
   • Do not independently perform a prolonged clamp search along a bubbling drain. Specialist-supervised brief occlusion may be used under the local troubleshooting protocol, with rapid release and close respiratory observation.
5. Subcutaneous Emphysema:
   • Characterized by air dissecting into the subcutaneous tissues of the chest wall, neck, and face. Manifests as soft tissue swelling that produces a classic crackling, popping sensation upon digital palpation (crepitus).
   • Outline the outer margins of the crepitus with a skin marker to track progression. Rapidly expanding subcutaneous emphysema indicates an improperly positioned tube, displaced eyelet, or severe air leak, which can threaten airway patency.
6. No 'Stripping' of Chest Tubes:
   • Milking or stripping chest tubes (vigorously compressing and pulling along the length of the tubing) generates extreme, dangerous negative intrathoracic pressures (up to -400 cmH2O), which traumatizes lung tissue, shears pleural adhesions, and provokes microvascular hemorrhage. Only gentle, intermittent repositioning of dependent loops is permitted.

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Tracheostomy & Endotracheal Airway Care

Artificial airways bypass the protective upper airway filtering, warming, and humidifying mechanisms, placing patients at high risk for airway obstruction, mucosal trauma, and ventilator-associated infections.

Open & Closed Tracheal Suctioning Principles

Tracheal suctioning is performed only when clinically indicated (audible gurgling, coarse crackles, decreased SpO2, visible secretions in the tube, increased peak airway pressures on mechanical ventilator) and never on a rigid schedule.

• Pre-Oxygenation: Always hyperoxygenate the patient with 100% oxygen for at least 30 to 60 seconds prior to inserting the suction catheter.
• Aseptic Technique: Maintain strict surgical sterility for open suctioning; use a sterile glove on the dominant hand and a clean glove on the non-dominant hand. For closed in-line suctioning, maintain cleanliness of the protective sleeve.
• Catheter Insertion: Use shallow suctioning first: insert gently without suction to the premeasured artificial-airway depth. Do not routinely advance to the carina or force against resistance. Deep suctioning is reserved for ineffective shallow suctioning under the applicable procedure.
• Suction Application: Apply suction intermittently while rotating the catheter 360 degrees between thumb and forefinger as it is smoothly withdrawn.
• Time Limit: Each individual suction pass must NOT exceed 10 to 15 seconds (suctioning removes oxygen as well as mucus).
• Number of Passes: Limit suctioning to a maximum of 2 to 3 passes per session. Allow at least 20 to 30 seconds of rest and hyperoxygenation between passes.
• Negative Suction Pressure: Set the vacuum regulator between 80 and 120 mmHg for adults (maximum 150 mmHg). Pressures exceeding 150 mmHg cause severe mucosal shearing, edema, and atelectasis.
• Emergency Cessation Rule: Monitor heart rate, rhythm, and SpO2 throughout the procedure. If the patient develops bradycardia (HR < 60 bpm), tachycardia, ventricular ectopy, or oxygen desaturation (SpO2 < 90%), IMMEDIATELY terminate suctioning, withdraw the catheter, and administer 100% oxygen via manual resuscitation bag or mechanical ventilator.

Cuff Pressure Monitoring Standards

The inflatable balloon cuff at the distal end of a tracheostomy or endotracheal tube seals the airway against positive-pressure ventilation leaks and minimizes microaspiration of contaminated subglottic secretions.

• Target Cuff Pressure: Maintain cuff pressure strictly between 20 and 30 cmH2O (equivalent to 15 to 22 mmHg), measured objectively at least once every 8 to 12 hours using a calibrated handheld cuff manometer.
• Complications of Hyperinflation (>30 cmH2O): Excessive cuff pressure can impair tracheal mucosal perfusion. Prolonged overinflation risks ulceration, necrosis, stenosis and tracheoesophageal fistula. Keep pressure in the recommended 20–30 cmH2O range using a manometer; do not compare a cmH2O reading directly with a threshold stated in mmHg.
• Complications of Underinflation (< 20 cmH2O): Inadequate seal allows silent microaspiration of pharyngeal secretions around the cuff into the lower respiratory tract, dramatically increasing the risk of Ventilator-Associated Pneumonia (VAP), as well as delivering subtherapeutic positive-pressure tidal volumes.

Mandatory Bedside Safety Equipment for Tracheostomy Patients

The following emergency equipment must be maintained and verified at the bedside of every patient with a tracheostomy at all times:

1. The Obturator: Taped visibly to the wall at the head of the bed in a clear plastic sleeve. The rounded obturator is inserted inside the outer cannula during emergency reinsertion to provide a smooth, blunt tip that prevents tracheal wall perforation.
2. Two Spare Tracheostomy Tubes:
   • One spare tube of the identical size and model currently in the patient.
   • One spare tube that is one size smaller (to facilitate emergency insertion if stomal edema or constriction prevents insertion of the standard size).
3. Working Suction System: Wall suction regulator, canister, tubing, and sterile suction catheters.
4. Emergency Resuscitation Equipment: Manual bag-valve-mask (Ambu bag) equipped with both a standard adult face mask and a 15-mm tracheostomy adapter.
5. Tracheal Dilator: Sterile curved Trusseau dilator or sterile curved Kelly hemostats to spread stomal edges if accidental decannulation occurs.
6. Sterile Water-Soluble Lubricant & Tracheostomy Ties/Dressing Kit.

Accidental Tracheostomy Decannulation Protocol

• Call for emergency airway/ENT assistance and prioritize oxygenation. Apply oxygen to both the face and stoma while assessing breathing and the documented upper-airway anatomy. If ventilation is needed and the upper airway is patent, use bag-mask ventilation over the face with the stoma gently occluded. Alternatively, ventilate through the stoma with a suitable mask while closing the mouth and nose. Assess chest rise and use waveform capnography when available.
• Avoid blind reinsertion, especially in a fresh or uncertain tract. A false passage can cause fatal airway obstruction; elapsed time alone does not establish a safe tract. Follow the emergency airway plan and have the same-size and smaller spare tubes ready. An experienced clinician may attempt stoma reinsertion if oxygenation cannot otherwise be maintained. If an obturator is used, remove it immediately after insertion and confirm effective ventilation before securing the tube.