You Are Ventilating A Patient With A Stoma

Ventilating a patient with a stoma requires a clear understanding of the airway anatomy, the specific type of stoma present, and the adjustments needed to deliver safe and effective mechanical ventilation. Whether the stoma is a tracheostomy, a laryngectomy opening, or another surgically created airway, the principles of ventilation remain rooted in maintaining adequate oxygenation, preventing lung injury, and minimizing complications such as infection or accidental decannulation. This guide walks you through the essential preparation, equipment, step‑by‑step technique, monitoring strategies, and troubleshooting tips you need to confidently manage a ventilated patient with a stoma.

1. Understanding the Stoma and Its Implications for Ventilation

A stoma is a surgically created opening that allows direct access to a body cavity. In the context of mechanical ventilation, the most relevant stomas are:

For the purpose of this article, we focus on tracheostomy and laryngectomy stomas, as they directly influence ventilatory mechanics.

Key physiological points:

• Airway resistance drops after a tracheostomy because the endotracheal tube’s length and curvature are eliminated. This can lead to higher tidal volumes for the same set pressure if not adjusted.
• Cuff pressure (if a cuffed tracheostomy tube is used) must be kept between 20–25 cm H₂O to prevent mucosal ischemia while maintaining an adequate seal.
• Humidification is critical; the bypassed upper airway no longer warms and humidifies inspired gases, increasing the risk of mucus plugging and atelectasis.
• Speaking valves (e.g., Passy‑Muir) can be used with cuff‑deflated tracheostomy tubes to allow phonation, but they must be removed during mechanical ventilation.

2. Preparing for Ventilation

2.1. Patient Assessment

1. Confirm stoma patency – suction gently to ensure no obstruction.
2. Check tube type and size – note inner diameter (ID), cuff status, and length. 3. Review recent imaging or bronchoscopy (if available) to rule out false tract or granulation tissue.
3. Assess secretion load – copious secretions may necessitate more frequent suctioning and heated humidification. 5. Determine ventilatory goals – based on underlying pathology (e.g., COPD exacerbation, postoperative ARDS).

2.2. Equipment Checklist

3. Step‑by‑Step Procedure for Initiating Ventilation

3.1. Pre‑oxygenation

1. Pre‑oxygenate the patient with 100 % FiO₂ via a bag‑valve‑mask (BVM) attached to the stoma for 3–5 minutes. 2. Suction the airway if secretions are visible or if the patient shows signs of distress.

3.2. Securing the Circuit

1. Connect the ventilator tubing to the tracheostomy tube using a swivel adapter to reduce torque on the tube.
2. If a cuffed tube is in place, inflate the cuff to the target pressure (verified with a manometer).
3. Attach the heated humidifier (set to 37 °C, 44 mg H₂O/L) or an HME if humidification is unavailable for short periods.

3.3. Setting Initial Ventilator Parameters | Parameter | Typical Starting Value | Rationale |

|-----------|-----------------------|-----------| | Mode | Assist‑Control (AC) Volume or Pressure | Guarantees a minimum minute ventilation | | Tidal Volume (Vt) | 6–8 mL/kg predicted body weight (PBW) | Lung‑protective strategy | | Respiratory Rate (RR) | 12–18 breaths/min | Adjust to achieve target PaCO₂ 35–45 mmHg | | FiO₂ | 0.30–0.50 (titrate to SpO₂ 92–96 %) | Avoid hyperoxia | | PEEP | 5 cm H₂O (increase if needed for oxygenation) | Prevents alveolar collapse | | Inspiratory Time (I:E) | 1:2 (adjust if needed for patient synchrony) | Ensures adequate expiratory time |

Note: Because tracheostomy reduces airway resistance, you may observe higher delivered Vt for a set pressure. Continuously monitor the actual exhaled Vt and adjust accordingly.

3.4. Initiating Ventilation 1. Start the ventilator and observe chest rise, breath sounds, and ventilator graphics.

3. Step‑by‑Step Procedure for Initiating Ventilation (Continued)

3.4. Initiating Ventilation (Continued)

1. Start the ventilator and observe chest rise, breath sounds, and ventilator graphics.
2. Immediately verify tube placement by auscultating bilateral breath sounds over the chest and checking for equal chest expansion. Auscultate the tracheostomy site itself; breath sounds should be present but diminished compared to the mouth.
3. Monitor vital signs (heart rate, blood pressure, SpO₂, EtCO₂) continuously.
4. Assess patient response: Look for signs of distress (tachycardia, hypertension, diaphoresis), excessive secretions, or inability to trigger the ventilator.
5. Check for tube dislodgement or obstruction: Ensure the swivel adapter is secure and the tube is not kinked. If suction is needed, use a closed system if available.

3.5. Post-Initiation Monitoring and Adjustment

1. Continuous monitoring:
   • SpO₂: Target 92–96% (adjust FiO₂ as needed).
   • EtCO₂: Target 35–45 mmHg. A sudden drop indicates tube displacement or obstruction.
   • Ventilator graphics: Verify delivered Vt matches set Vt (especially with volume control).
   • Arterial blood gases (ABGs): Obtain within 30–60 minutes to confirm ventilation and oxygenation goals (PaO₂ >60 mmHg, PaCO₂ 35–45 mmHg).
2. Adjust parameters based on response:
   • If hypercapnia (elevated EtCO₂/PaCO₂): Increase Respiratory Rate (RR) or Tidal Volume (Vt).
   • If hypoxemia (low SpO₂): Increase FiO₂ or PEEP.
   • If hemodynamic instability: Consider reducing RR or Vt slightly, ensure adequate sedation/analgesia, and rule out pneumothorax.
   • If patient is triggering the ventilator excessively: Ensure adequate sedation and consider increasing I:E ratio.
3. Regular tube checks: Ensure the swivel adapter is secure and the tube is not displaced.

3.6. Emergency Considerations

• Cuff deflation: If the patient becomes hemodynamically unstable or develops a pneumothorax, immediately deflate the cuff (using a manometer to confirm 0 cm H₂O) and switch to a cuffless circuit if available.
• Rapid re-establishment: Have the emergency tracheostomy kit readily accessible. If the tube is dislodged or obstructed beyond suction, be prepared for immediate re-intubation via the stoma using the emergency kit.

Conclusion

Initiating mechanical ventilation via a tracheostomy requires meticulous preparation, precise equipment selection, and a systematic approach to ensure patient safety and effective gas exchange. The cornerstone is pre-oxygenation, secure circuit connection, and appropriate humidification. Setting initial ventilator parameters (AC mode, lung-protective Vt, targeted RR, FiO₂, PEEP) provides a foundation, but continuous, vigilant monitoring of physiological parameters (SpO₂, EtCO₂, ABGs) and ventilator graphics is paramount. Immediate verification of tube placement and ongoing assessment of the patient's response to ventilation are critical to detect and promptly address complications such as tube displacement, obstruction, or hemodynamic instability. The presence of a spare tube, emergency tracheostomy kit, and suction equipment at the bedside is non-negotiable for managing unforeseen events. By adhering to this structured protocol, healthcare providers can effectively transition a patient from an acute tracheostomy to stable, controlled ventilation, minimizing risks and optimizing outcomes.