Does Sodium Bicarbonate Help in Cardiac Arrest Trials?
Clinicians frequently consider empirical treatments during advanced resuscitation. However, routine sodium bicarbonate cardiac arrest administration does not improve resuscitation outcomes. A landmark multicenter randomized trial evaluated whether intravenous sodium bicarbonate improves sustained return of spontaneous circulation. Consequently, researchers investigated adult patients suffering in-hospital cardiac arrest. The findings challenge decades of empirical bedside practice across emergency units.
Evaluating Sodium Bicarbonate Cardiac Arrest Outcomes
The double-blind BIHCA trial enrolled adult patients across twenty-one hospital centres. Specifically, investigators randomized participants receiving adrenaline to receive either sodium bicarbonate or matched saline placebo. Patients received up to two doses during active resuscitation efforts. Ultimately, thirty-nine percent of patients in the bicarbonate group achieved sustained circulation. Similarly, thirty-seven percent of patients receiving placebo achieved sustained circulation. Therefore, the primary outcome showed no statistically significant difference between groups.
Secondary Outcomes and Adverse Effects
Secondary clinical endpoints also demonstrated no meaningful divergence between trial groups. For instance, thirty-day survival reached twelve percent with bicarbonate and nine percent with placebo. Furthermore, favorable neurological survival rates remained comparable at eight percent versus five percent. However, the intervention caused notable metabolic complications. Specifically, patients receiving bicarbonate experienced significantly higher rates of hypernatremia and alkalosis. Thus, the drug added physiological stress without providing demonstrable clinical benefit.
Clinical Implications for Resuscitation Teams
Physicians often administer bicarbonate to correct severe metabolic acidosis during prolonged arrest. Nevertheless, intracellular paradoxical acidosis and hyperosmolarity frequently worsen myocardial dysfunction. Resuscitation guidelines already recommend against routine buffer administration during cardiac arrest. Therefore, clinicians must reserve sodium bicarbonate for established indications. In particular, verified hyperkalemia and severe tricyclic antidepressant toxicity warrant targeted therapy. Resuscitation teams should prioritize uninterrupted chest compressions and early defibrillation instead.
Frequently Asked Questions
Q1: Does sodium bicarbonate improve survival in cardiac arrest?
No, rigorous randomized trial data show no improvement in sustained return of spontaneous circulation or overall survival.
Q2: When should clinicians administer sodium bicarbonate during resuscitation?
Clinicians should only administer sodium bicarbonate for specific conditions such as hyperkalemia or severe sodium-channel blocker overdose.
Q3: What risks accompany sodium bicarbonate administration?
Sodium bicarbonate can induce severe metabolic alkalosis, hypernatremia, and paradoxical intracellular acidosis during low-flow states.
References
- Maqsood MH et al. In adults with in-hospital cardiac arrest, sodium bicarbonate vs. placebo did not increase sustained ROSC rates. Ann Intern Med. 2026 Oct 06. doi: 10.7326/ANNALS-26-03498-JC. PMID: 42832811.
- Granfeldt A, Kirkegaard BL, Vallentin MF, et al. Sodium Bicarbonate for In-Hospital Cardiac Arrest: A Randomized Clinical Trial. JAMA. 2026;332(6):467-476. doi:10.1001/jama.2026.10628.
- Callaway CW. Sodium Bicarbonate for In-Hospital Cardiac Arrest. JAMA. 2026;332(6):455-457. doi:10.1001/jama.2026.11077.
