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Daily Medical Update
Metabolic acidosis
Thursday, September 10, 2026
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🔬 Practice-Changing Findings
Evidence from RCTs and meta-analyses published in the
last 12 months.
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Acta anaesthesiologica Scandinavica (2026) - Systematic Review and Meta-Analysis
Key Findings
- In ICU patients with acute kidney injury, buffering therapy likely reduced renal replacement therapy use and bloodstream infections.
- Buffering therapy probably had no large effect on survival in ICU acute kidney injury and did not improve survival after out-of-hospital cardiac arrest.
📋 Practice Implication: Use bicarbonate primarily as a potential renal-support intervention in selected ICU patients, while avoiding claims of a proven survival benefit.
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Critical care medicine (2026) - Meta-Analysis of Randomized Clinical Trials
Key Findings
- Sodium bicarbonate significantly reduced renal replacement therapy use (risk ratio 0.69, 95% CI 0.61–0.78).
- Mortality showed a nonsignificant trend toward reduction (risk ratio 0.84, 95% CI 0.55–1.30), and secondary outcomes remained imprecise.
📋 Practice Implication: For critically ill adults with acute metabolic acidosis, bicarbonate may reduce the need for RRT, but mortality decisions should remain cautious pending larger trials.
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Critical care (London, England) (2026) - Individual Patient Data Meta-Analysis
Key Findings
- Sodium bicarbonate reduced renal replacement therapy initiation from 50.7% to 34.8% (risk ratio 0.69, 95% CI 0.60–0.79).
- Overall 90-day mortality was not significantly reduced (58.3% vs. 60.6%; risk ratio 0.96, 95% CI 0.86–1.07), while the most profound acidemia subgroup suggested mortality benefit.
📋 Practice Implication: Consider the greatest potential benefit in severe acidemia with a pH at or below 7.10, but treat the subgroup mortality signal as hypothesis-generating rather than definitive.
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The Cochrane database of systematic reviews (2026) - Systematic Review and Meta-Analysis
Key Findings
- Buffered solutions made little to no difference to in-hospital mortality (odds ratio 0.95, 95% CI 0.90–1.01) or acute kidney injury (odds ratio 0.87, 95% CI 0.75–1.02) versus 0.9% saline.
- Buffered solutions may reduce chloride and increase pH and bicarbonate, although certainty for these biochemical outcomes was low.
📋 Practice Implication: Choose buffered crystalloid when limiting chloride-associated acid-base disturbance is important, while recognizing that broad mortality and AKI advantages have not been established.
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Journal of intensive care medicine (2025) - Systematic Review and Meta-Analysis of Randomized Controlled Trials
Key Findings
- In pediatric septic shock, balanced salt solution was associated with lower acute kidney injury (sensitivity-analysis risk ratio 0.64, 95% CI 0.50–0.82), less RRT (risk ratio 0.52, 95% CI 0.35–0.76), and less hyperchloremia (risk ratio 0.74, 95% CI 0.62–0.87).
- Balanced salt solution was not associated with lower mortality (risk ratio 0.82, 95% CI 0.45–1.50), and data were too sparse for conclusions about metabolic acidosis itself.
📋 Practice Implication: In children with septic shock, balanced fluids are a reasonable organ-protective alternative to saline, but fluid selection should not be presented as a mortality-reducing therapy.
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Summary
Recent evidence supports sodium bicarbonate or other buffering therapy as a way to reduce renal replacement therapy use in selected critically ill adults with acute metabolic acidosis, but overall mortality benefit remains unproven. The strongest individual-patient analysis suggests a possible mortality benefit in patients with the most profound acidemia (pH ≤ 7.10), while buffered crystalloids improve chloride, pH, and bicarbonate profiles without established mortality or acute kidney injury advantages. In pediatric septic shock, balanced fluids were associated with less acute kidney injury, renal replacement therapy, and hyperchloremia, but not lower mortality; evidence for metabolic acidosis outcomes was sparse.
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