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Background This is a prospective observational study to examine if the delayed supine positioning after induction of subarachnoid block will be of value in minimizing hemodynamic derangement following subarachnoidblock for knee Arthroscopein the teaching hospital of Misr University for science and technology Methods Fifty healthy patients are undergoing knee Arthroscope under spinal Anesthesia were randomized into 2 groups Group A(immediate supine position after Subarachnoid block) and Group B (delayed supine position after Subarachnoid block by 2.5 minutes) each group includes 25 patients. After the injection of local anaesthetic, Heart rate (HR), non-invasive blood pressure (Systolic Blood pressure (SBP), diastolic Blood pressure (DBP) and mean blood pressure(MBP)) were measured at 3 min intervals for the first 15 min following administration of local anaesthetic, and then every 5 min until completion of the surgical intervention. Results Hemodynamic readings (SBP, DBP, MBP, HR) showed more stability in Group(B) than Group(A), group(A) showed higher anesthetic sensory level but adequate anesthetic sensory level to perform Knee Arthroscope surgery was achieved in group (B) Conclusion Under the conditions of this study delayed supine positioning after induction of SAB for 2.5 minutes is of great value in gaining an adequate level of anesthesia with more hemodynamic stability and less vasopressor need as a management of hypotension compared to the conventional SAB in Knee Arthroscope surgery.

Effects of Delayed Supine Positioning after Induction of Subarachnoid Block on Post-spinal Hemodynamic Changes Compared to Traditional Subarachnoid Block: prospective observational randomized controlled dose response clinical study