Hemodynamics, fluids & transfusion

Exploration of different statistical approaches in the comparison of dopamine and norepinephrine in the treatment of shock: SOAP II

Crit CarePublished Secondary analysis of the SOAP II randomised trial

Primary result · Hierarchical endpoint (death, new RRT, new arrhythmia)Result — go to the resultWin ratio 0.79 95% CI 0.68–0.92

Authors' conclusion

The harm associated with the use of dopamine for the management of shock appears to be present in both septic and cardiogenic shock patients. There was no suggestion of any subgroup in which dopamine was found to be favourable over norepinephrine.

Study context

Population
Patients with shock enrolled in SOAP II (62% septic, 17% cardiogenic shock)
Participants
1,679 patients
Comparison
Dopamine vs norepinephrine for shock
Primary endpoint
Hierarchy of:
  1. Death
  2. New use of RRT
  3. New-onset arrhythmia (win-ratio)
Methodological detailswin-ratio, Bayesian reanalysis stratified by shock type, risk-based and effect-based heterogeneity of treatment effect
  • Win-ratio
  • Bayesian reanalysis stratified by shock type
  • Risk-based and effect-based heterogeneity of treatment effect

Primary result

As reported in the abstract

Hierarchical endpoint:
  1. Death
  2. New RRT
  3. New arrhythmia

Win ratio

0.79

95% CI 0.68–0.92

P = 0.003

Dopamine vs Norepinephrine
WR 0.79 (95% CI 0.68–0.92); P = 0.003

Further findings

Bayesian reanalysis by shock type: probability of harm with dopamine

Probability of harm, mortality
0.95
Probability of harm, composite endpoint (mortality, new renal-replacement therapy (RRT), new arrhythmia)
> 0.99
Probability of harm, DAFICU28
0.91
Fewer DAFICU28 with dopamine, cardiogenic shock
0.92

Risk-based heterogeneity in treatment effect (HTE), DAFICU28

High probability of fewer DAFICU28 with dopamine in highest quartile of predicted mortality risk

Effect-based HTE, composite endpoint

Absolute increase in composite endpoint when receiving dopamine where model recommended norepinephrine
6%
Dopamine not recommended over norepinephrine for any combination of modifiers (age, shock type, cardiomyopathy, SOFA score)

Original publication

Exploration of different statistical approaches in the comparison of dopamine and norepinephrine in the treatment of shock: SOAP II. Crit Care. Published 10 September 2024. doi:10.1186/s13054-024-05016-9

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