When a study compares recovery from two sedative regimens, check what happened at the end of each procedure. In a rhesus macaque study by Bertrand and colleagues, the recovery comparison included an active reversal step for one group.
What differed after the observation period
The researchers allocated 16 macaques to ketamine or a combination of fentanyl, midazolam and medetomidine. After the scheduled 20-minute assessment, the combination group received atipamezole and naloxone. The ketamine group did not receive a corresponding reversal regimen. Reported mean recovery times were 9.1 minutes for the combination protocol and 21.4 minutes for ketamine.
Which conclusion the comparison supports
The result describes recovery under the two protocols as performed, including the reversal agents. The study had no unreversed combination group, so it did not measure how long recovery from the combination would take without that intervention. An expert comparing a real-world timeline with this experiment should identify which medicines were given and when reversal occurred before applying the study’s times.
Source
Bertrand et al., BMC Veterinary Research (2016), full text · DOI
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