Rocuronium vs succinylcholine for RSI
Succinylcholine gives better intubating conditions — except at the dose rocuronium is actually given for RSI, where the difference disappears.
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The traditional argument for succinylcholine has two parts: better intubating conditions, and a short duration that lets the patient wake up if intubation fails. The first part is true at low rocuronium doses and disappears at high ones. The second part was questionable before sugammadex existed and is now largely reversed.
Key takeaways
- Succinylcholine produces better intubating conditions overall — but the Cochrane meta-analysis found no statistical difference against rocuronium at 1.2 mg/kg.
- The advantage is dose-dependent, and it essentially disappears once rocuronium is dosed for RSI rather than for routine intubation.
- The “it wears off” rescue argument does not survive scrutiny. Critical desaturation occurs before return to an unparalyzed state after succinylcholine 1 mg/kg.
- Rocuronium plus sugammadex re-establishes spontaneous ventilation faster than succinylcholine does in a randomized trial.
- Succinylcholine has a long contraindication list. Rocuronium’s is allergy.
- In critically ill patients, desaturation rates were no different between the two.
Intubating conditions: the dose is the whole argument
The Cochrane systematic review pooled 50 trials and 4,151 participants.1,2
| Comparison | Result |
|---|---|
| Overall — excellent intubating conditions | Succinylcholine superior, RR 0.86 (95% CI 0.81–0.92); ARR 12%, NNT 83 |
| Overall — clinically acceptable conditions | RR 0.97 (95% CI 0.95–0.99) — statistically significant, clinically marginal |
| Rocuronium 0.9–1.0 mg/kg | RR 0.95 (95% CI 0.89–1.00) — essentially no difference |
| Rocuronium 1.2 mg/kg | No statistical difference from succinylcholine2 |
This is why the same review can be cited by both sides. The headline conclusion — succinylcholine created superior intubating conditions — is accurate, and so is the finding that no difference exists at the doses actually used for rapid sequence induction. The authors’ own reasoning for still preferring succinylcholine at 1.2 mg/kg was that it is “clinically superior as it has a shorter duration of action”2 — which is the second argument, not the first.
Other trials support the equivalence at proper dose. In 401 critically ill patients requiring emergent RSI, randomized to succinylcholine 1 mg/kg or rocuronium 0.6 mg/kg, there was no difference in oxygen desaturation.4 A randomized trial in elderly patients found excellent intubating conditions in 73% versus 75% (p = 0.82).5
The rescue argument, examined
The reasoning is intuitive: if intubation fails, succinylcholine wears off in six to ten minutes and the patient resumes breathing. Two findings undermine it.
First: critical desaturation occurs before the patient is unparalyzed. Benumof and colleagues showed that critical hemoglobin desaturation will occur before return to an unparalyzed state following succinylcholine 1 mg/kg intravenously.6 A patient who cannot be intubated or ventilated does not have the six to ten minutes that the argument assumes — they have the duration of their own oxygen reserve, which is shorter.
Second: rocuronium plus sugammadex is faster. In a randomized, patient- and observer-blinded trial, RSI with rocuronium 1 mg/kg followed by sugammadex 16 mg/kg after intubation allowed earlier re-establishment of spontaneous ventilation than succinylcholine 1 mg/kg.7
The authors of that trial were careful about what it does and does not show: they did not study a can’t-intubate-can’t-ventilate situation, where the answer is a front-of-neck airway rather than reversal.7 The scenario it does speak to is the more common one — a skilled operator recognizing early, before desaturation, that intubation will not succeed and wanting the patient back.
That distinction matters. Sugammadex is a rescue for failed intubation with maintained oxygenation. It is not a substitute for a surgical airway once oxygenation has failed.
The contraindications
| Succinylcholine | Rocuronium |
|---|---|
| Known hyperkalemia Severe burns beyond 48 hours Major crush injury beyond 48 hours Denervation syndromes Muscular dystrophy Malignant hyperthermia susceptibility Prolonged immobilization3 | Allergy3 |
Succinylcholine also causes bradycardia and asystole, plasma potassium elevation, myalgia, and masseter spasm.8 Rocuronium has little or no adverse cardiovascular effect and does not release histamine,9 which is why it may be preferred in patients where hemodynamic change is poorly tolerated — including those with mast cell activation syndrome.
Duration, and what it costs
Succinylcholine lasts roughly 6–10 minutes. Rocuronium at RSI doses lasts roughly 37–72 minutes.3 Where sugammadex is unavailable, that is a genuine and substantial difference, and it is the strongest remaining argument for succinylcholine.
Where sugammadex is available and immediately at hand, the calculation changes: rocuronium 1.2 mg/kg gives intubating conditions that are not statistically different from succinylcholine, reversal is faster than spontaneous recovery, and the contraindication list is one item long.
“Immediately at hand” is doing real work in that sentence. Sugammadex 16 mg/kg is a large dose — for an 80 kg patient that is 1,280 mg, which is six or seven vials at the usual concentration. If the drug is in a locked cupboard, in the pharmacy, or in a quantity insufficient for a 16 mg/kg dose, the rescue argument does not apply to your institution regardless of what the literature says. The dosing detail is on the sugammadex dosing page.
The practical reading
- If you use rocuronium for RSI, dose it for RSI. The equivalence in intubating conditions holds at 1.2 mg/kg and degrades below it.
- Check what a 16 mg/kg dose means at your institution — how many vials, where they are, and how long it takes to get them.
- Do not treat succinylcholine’s duration as a safety net in a patient who is difficult to oxygenate. The desaturation data say the net is not there.
- Where succinylcholine is contraindicated the question does not arise, and its contraindication list is long enough that this is a frequent situation.
- Sugammadex is not the answer to can’t-intubate-can’t-oxygenate. That is a front-of-neck problem, and reaching for reversal instead costs time.
Frequently asked questions
Is rocuronium as good as succinylcholine for RSI?
At the right dose, yes. The Cochrane review of 50 trials and 4,151 participants found succinylcholine superior overall for excellent intubating conditions (RR 0.86), but no statistical difference against rocuronium at 1.2 mg/kg, and RR 0.95 (0.89–1.00) at 0.9–1.0 mg/kg.1,2 The difference is a dose effect.
Does succinylcholine wear off fast enough to rescue a failed intubation?
Not reliably. Critical hemoglobin desaturation occurs before return to an unparalyzed state after succinylcholine 1 mg/kg.6 A patient who cannot be intubated or oxygenated has the duration of their oxygen reserve, not the duration of the drug.
Is rocuronium plus sugammadex faster than succinylcholine?
For re-establishing spontaneous ventilation, yes. A randomized, patient- and observer-blinded trial found that RSI with rocuronium 1 mg/kg followed by sugammadex 16 mg/kg allowed earlier return of spontaneous ventilation than succinylcholine 1 mg/kg.7 The authors noted this does not address a can’t-intubate-can’t-ventilate situation, where a front-of-neck airway is the answer.
What dose of rocuronium is used for rapid sequence intubation?
1.2 mg/kg is the dose at which the Cochrane review found no statistical difference from succinylcholine in intubating conditions.2 Lower doses shorten the duration but degrade the conditions, and 0.6 mg/kg is a routine intubating dose rather than an RSI dose.
When is succinylcholine contraindicated?
Known hyperkalemia, severe burns beyond 48 hours, major crush injury beyond 48 hours, denervation syndromes, muscular dystrophy, malignant hyperthermia susceptibility, and prolonged immobilization.3 It also causes bradycardia and asystole, potassium elevation, myalgia and masseter spasm.8 Rocuronium’s only contraindication is allergy.
Can sugammadex rescue a can’t-intubate-can’t-oxygenate situation?
No, and treating it as though it can costs time. Sugammadex reverses paralysis; it does not open an obstructed airway or restore oxygenation in a patient who cannot be ventilated. The trial authors explicitly declined to extend their finding to that scenario.7 Once oxygenation has failed, the answer is a front-of-neck airway.
References
- Tran DTT, Newton EK, Mount VAH, Lee JS, Wells GA, Perry JJ. Rocuronium vs. succinylcholine for rapid sequence intubation: a Cochrane systematic review. Anaesthesia. 2017;72(6):765–777. PMID 28654173. Fifty trials, 4,151 participants.
- Tran DTT, Newton EK, Mount VAH, et al. Rocuronium versus succinylcholine for rapid sequence induction intubation. Cochrane Database Syst Rev. 2015;10:CD002788. PMID 26512948. Excellent conditions RR 0.86 (0.81–0.92, n = 4151); clinically acceptable RR 0.97 (0.95–0.99, n = 3992, 48 trials); no statistical difference against rocuronium 1.2 mg/kg, with the authors’ reasoning that succinylcholine remains “clinically superior as it has a shorter duration of action.”
- Rocuronium vs. succinylcholine for rapid sequence intubation. TheNNT review of the Cochrane analysis. Reports the ARR of 12% and NNT of 8, the contraindication list, and the duration figures of 6–10 minutes for succinylcholine and 37–72 minutes for rocuronium.
- Marsch SC, Steiner L, Bucher E, et al. Succinylcholine versus rocuronium for rapid sequence intubation in intensive care: a prospective, randomized controlled trial. Crit Care. 2011;15:R199. doi:10.1186/cc10367. 401 critically ill patients.
- Intubating conditions during rapid sequence induction with either rocuronium or suxamethonium in elderly patients: a randomised study. PMC11798891. Excellent intubating conditions 73% versus 75% (p = 0.82).
- Benumof JL, Dagg R, Benumof R. Critical hemoglobin desaturation will occur before return to an unparalyzed state following 1 mg/kg intravenous succinylcholine. Anesthesiology. 1997;87(4):979–982.
- Sørensen MK, Bretlau C, Gätke MR, Sørensen AM, Rasmussen LS. Rapid sequence induction and intubation with rocuronium–sugammadex compared with succinylcholine: a randomized trial. Br J Anaesth. 2012;108(4):682–689. doi:10.1093/bja/aer503. PMID 22315329. Includes the authors’ reply to correspondence clarifying the can’t-intubate-can’t-ventilate limitation.
- Sørensen MK, et al., as above, on the adverse effect profile of succinylcholine — bradycardia, asystole and plasma potassium elevation.
- Comparison of intubating conditions following administration of low-dose rocuronium or succinylcholine in adults: a randomized double blind study. PMC4173439. Notes rocuronium’s onset comparable to succinylcholine above 0.9 mg/kg and its lack of cardiovascular effect or histamine release.
Disclaimer. Reference information for licensed clinicians and students. Not a medical device, and not a substitute for clinical judgment. Whether sugammadex rescue is available to you is an institutional question, not a literature one. Verify against your institutional protocol and current package inserts.
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