Can You Place a Supraglottic Airway with Ketamine Alone (Without a Paralytic)?
Yes, you can successfully place a supraglottic airway device (SAD) using ketamine induction without a paralytic agent, and this approach is supported by clinical evidence showing high success rates with maintained hemodynamic stability.
Key Evidence Supporting Ketamine-Only SAD Placement
Ketamine's unique dissociative properties allow for adequate jaw relaxation and airway insertion conditions without neuromuscular blockade. Research demonstrates that ketamine-propofol combinations (ketofol) provide equivalent SAD insertion conditions compared to propofol alone, with the added benefit of maintaining hemodynamics 1. In pediatric populations, ketofol achieved comparable laryngeal mask airway insertion scores while maximizing hemodynamic stability and minimizing apnea time 1.
Clinical Performance Data
First-pass success rates are excellent with ketamine-facilitated SAD placement:
- In prehospital settings using ketamine for medication-facilitated airway management with first-line SAD use, the first-pass success rate was 87.5% when protocol was followed 2
- This compares favorably to non-compliant first-line endotracheal intubation attempts at only 44.4% 2
- No SADs required emergent exchange upon hospital arrival due to dislodgement 2
When This Approach Is Particularly Valuable
Ketamine-only breathing intubation (KOBI) or SAD placement is especially useful when:
- The patient cannot tolerate apnea (severe hypoxia, acidemia, or hemodynamic instability)
- Difficult airway anatomy is anticipated
- Inadequate time for preparation and preoxygenation exists
- You want to preserve spontaneous ventilation as a safety mechanism 3
Important Caveats and Limitations
The Critical Exception - Emergency FONA
The most recent DAS 2025 guidelines explicitly state: "An eFONA should not be attempted without full neuromuscular block" 4. This is the one scenario where paralysis is mandatory. If you've reached a "cannot intubate, cannot oxygenate" (CICO) situation requiring emergency front-of-neck airway, you must administer a paralytic (and if sugammadex was given, use a non-rocuronium/vecuronium agent) 4.
Guideline Context
The ASA 2022 guidelines acknowledge that supraglottic airways are appropriate noninvasive devices for difficult airway management 5. While these guidelines don't specifically mandate paralytic use for SAD placement, they emphasize:
- Limiting attempts to avoid injury
- Testing mask ventilation after each attempt when feasible
- Being aware of passage of time and oxygen saturation 5
Practical Approach
For ketamine-facilitated SAD placement without paralytic:
Dosing: Use ketamine 1-2 mg/kg IV for induction (based on general anesthetic dosing principles)
Expect maintained spontaneous ventilation: This is a safety feature, not a bug - the patient continues breathing while you secure the airway 3
Hemodynamic advantages: Ketamine maintains or increases blood pressure and heart rate, unlike propofol which causes significant drops 1, 6
Insertion technique: Use a second-generation SAD (i-gel, LMA Supreme) as recommended by DAS 2025 guidelines 4
Limit attempts: Maximum 3 attempts per DAS guidelines 4
Common Pitfalls to Avoid
- Don't assume you need paralysis for SAD placement - the evidence shows excellent success without it
- Don't use this approach for emergency FONA - that's the one absolute contraindication 4
- Don't forget preoxygenation - even though spontaneous ventilation is maintained, optimize oxygen reserves
- Monitor for emergence reactions - ketamine's known side effect, though less relevant in emergency airway scenarios 7
Bottom Line Algorithm
Can you do it? → Yes, with high success rates
Should you do it? → Yes, especially when:
- Hemodynamic instability present
- Difficult airway anticipated
- Need to preserve spontaneous ventilation
- Time-critical situation
Must you avoid it? → Only if proceeding to emergency FONA (CICO scenario) - then paralysis is mandatory 4