Research Article: S-ketamine plus dexmedetomidine vs. S-ketamine plus propofol for sedation–analgesia during positioning for spinal anesthesia in older adults undergoing lower extremity fracture surgery
Abstract:
Positioning for neuraxial anesthesia in geriatric lower extremity fracture surgery is painful and can destabilize hemodynamics. Sedation–analgesia must balance effective analgesia with respiratory safety and physiologic stability.
This single-center retrospective cohort study included patients aged ?65?years undergoing lower extremity fracture surgery under spinal anesthesia who received S-ketamine plus dexmedetomidine (Group A, n =?48) or S-ketamine plus propofol (Group B, n =?46). Primary outcomes included a numerical rating scale (NRS) positioning pain score of 0–10 and an ordinal posture quality score measured at five stages (T1–T5). Repeated measures were analyzed using mixed-effects models (group, stage, group×stage; random: patient) with covariate adjustment. Stage-wise contrasts were Holm-corrected.
A total of 100 records were screened, and 94 patients were analyzed. Group×stage interactions were significant for pain and posture quality. Group A had lower pain during the most noxious stages (T3–T5; adjusted differences ?0.42 to ?0.50) and higher odds of better posture quality (OR 2.30–2.70). Physiological differences were modest and stage-specific, with slightly higher SpO 2 and lower heart rate (HR)/mean arterial pressure (MAP) at T2–T3. Postoperative NRS differed only at 12?h. Adverse events were infrequent; delirium was identified from routine documentation without a standardized instrument (0/48 vs. 2/46).
In this retrospective cohort, dexmedetomidine-based sedation with S-ketamine was associated with improved comfort and cooperation during spinal positioning compared with propofol-based sedation, while adverse events were infrequent in both groups.
Introduction:
Positioning for neuraxial anesthesia in geriatric lower extremity fracture surgery is painful and can destabilize hemodynamics. Sedation–analgesia must balance effective analgesia with respiratory safety and physiologic stability.
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