A change in regimen across calendar periods can be confounded by changes in practice.
What the publication shows
The retrospective study compared sixty-two patients receiving dexmedetomidine with midazolam against seventy-eight earlier patients managed with midazolam alone. The newer regimen required less additional midazolam and had fewer oxygen-desaturation events, but lower minimum blood pressure and heart rate were also reported.
Limits of the evidence
The groups were not randomized contemporaneously. Monitoring, operators, patient selection and procedural practice may have changed. Reduced supplemental midazolam does not isolate the independent effect of adding dexmedetomidine, and no serious arrhythmia in this sample does not exclude rare risk.
Application to expert review
For an expert comparison, report respiratory and circulatory outcomes together. Examine whether the actual patient resembled the over-eighty cohort and whether the same sedation target was used. A dose-sparing result should not become an unqualified statement of overall superiority.
Source and related reading
Source: Publication PMC6219039. The case-review applications above are interpretive analysis.
Related reading: COVID-ARDS Sedation Cohort’s Shorter Stay Was Confounded by Very High Mortality.
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