COPD Exacerbation With Decreasing Consciousness
Dispatch sends you to a rural farmhouse for a 68-year-old man in respiratory distress. His wife reports two days of worsening cough and today he became 'sleepy.' He is sitting bolt upright, tripoding, and speaking in two- to three-word phrases. Vital signs: RR 34 and shallow, SpO2 82% on a nonrebreather at 15 L/min, HR 124, BP 146/88, temperature 38.1°C. He has diffuse expiratory wheezes and coarse crackles at both bases. He is drowsy but opens his eyes to voice and localizes pain; he can answer simple questions but drifts off. He has a history of COPD and uses home oxygen. The nearest hospital is 25 minutes away; no ALS backup is available. Your partner is a basic EMT. You carry a CPAP device, oral and nasal airways, a bag-valve-mask, and a video laryngoscope with endotracheal tubes.
1. At the scene, should you place this patient on CPAP? Explain the decision using his mental status, work of breathing, and likely diagnosis, and state your switch point.
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Treat CPAP as a short, monitored trial rather than a definitive airway. He is sitting upright and generating effort, and CPAP can stent small airways and reduce the work of breathing in COPD with respiratory failure. However, he is drowsy and drifts off, and CPAP requires enough alertness to keep the mask sealed and protect the airway. Because he can follow simple commands and localize pain, a 3-5 minute trial at low PEEP (about 5-8 cm H2O) is reasonable while you prepare BVM, suction, and airway equipment. Stop immediately if he cannot keep the mask on, becomes more obtunded, vomits, becomes hypotensive, or shows no improvement. Do not use CPAP as a reason to delay transport. If he cannot cooperate or protect his airway, go straight to BVM and advanced airway preparation.
2. He becomes unresponsive, SpO2 74%, RR 8, and has vomited. What sequence of airway and ventilation actions do you take, and what ventilation rate and target do you aim for?
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Suction the oropharynx, place him supine, insert an OPA if tolerated, and start two-person BVM ventilation with 100% oxygen. Use an oral airway and jaw thrust; if vomit recurs, suction again. Ventilate at about 10 breaths/min (one breath every 6 seconds) with just enough volume to see chest rise. Target SpO2 88-92% for a known CO2 retainer, not 100%, and use capnography to trend. Avoid the instinct to hyperventilate: rapid, large breaths raise intrathoracic pressure, reduce venous return, and can cause hypotension and barotrauma. If ventilation is ineffective or he remains hypoxic, proceed to advanced airway with video laryngoscopy and have suction ready. Reassess chest rise, breath sounds, and gastric distention.
3. During transport, his BP falls to 78/40 after 10 minutes of BVM ventilation. What are two likely causes related to your ventilation, and what do you change?
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Two ventilation-related causes are dynamic hyperinflation/auto-PEEP from too-fast or too-large breaths, and barotrauma such as tension pneumothorax. Slow the rate to 8-10/min, allow complete exhalation, and reduce tidal volume to just enough chest rise. Check for unilateral absent breath sounds, tracheal deviation, and worsening compliance; if tension pneumothorax is suspected, needle decompression per protocol. Also consider gastric distention from excessive BVM pressure, which splints the diaphragm. Treat hypotension with positioning and cautious fluids while correcting ventilation; do not simply speed up the bagging.