Medication‑Free (Crash) Intubation in Cardiac Arrest and Deep Coma

Indications and Physiologic Rationale

In patients who are in cardiac arrest or who have a Glasgow Coma Scale ≤ 3, airway protective reflexes (gag, cough) are absent, so pharmacologic agents to facilitate intubation are unnecessary and may delay definitive airway control. 1
The loss of consciousness and reflexes in cardiac arrest eliminates the physiologic need for induction or paralytic drugs, unlike the majority of severely ill or injured patients who retain reflexes and therefore require medication‑assisted intubation. 2

While performing cardiopulmonary resuscitation, interruptions to chest compressions should be limited to ≤ 10 seconds; medication preparation and administration would extend interruptions without providing benefit. 1
Rapid placement of an endotracheal tube without drugs provides an alternative conduit for drug delivery during resuscitation, making medication‑free intubation the priority. 1
Administration of induction agents or neuromuscular blockers in cardiac arrest can cause hypotension and vasodilation, worsening the already compromised circulatory state. 4

Crash intubation must not be performed in patients who are merely obtunded (GCS 6–8) because they retain some airway reflexes; these patients require rapid‑sequence intubation (RSI) with medications. 3
Obese patients who are not in cardiac arrest should receive full RSI with pre‑oxygenation, as obesity accelerates desaturation and the risk of hypoxic injury. 5
Trauma patients should be assessed for level of consciousness rather than mechanism of injury; those with any retained reflexes need RSI, not crash intubation. 2

Direct laryngoscopy is the standard technique; videolaryngoscopy may be used if the operator is experienced and the device is available. 3
When cervical spine injury is suspected, manual in‑line stabilization should be applied and the anterior portion of the cervical collar removed to allow tube passage. 5
Waveform capnography must be attached immediately after tube placement to confirm correct endotracheal positioning. 3

If tube placement fails and adequate ventilation cannot be achieved with bag‑mask ventilation, proceed without delay to a surgical front‑of‑neck airway (cricothyrotomy) using a scalpel with a vertical incision. 3

Tracheal intubation has not been shown to improve survival or neurologic outcome in cardiac arrest, reinforcing that the risk‑benefit balance of medication use is unfavorable in this context. 2
Delaying intubation to “optimize” a cardiac arrest patient (e.g., by administering drugs) worsens outcomes because each second without compressions or a definitive airway increases the likelihood of irreversible injury. 1