The aim of this work is to compare atenolol, propranolol, and ivabradine as a premedication to achieve bloodless field anesthesia primarily controlling heart rate in lumbar spine surgery.
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Perioperative Heamodynamic Effect of the drugs
Timeframe: every 5 minutes for 15 minutes and then every 10 minutes till end of surgery, then every 15 minutes for 1hour in the recovery room