The incidences of sinus tachycardia ( 5 % vs 25 % ) and hypertension ( 0 vs 30 % ) in group P were significantly reduced than in group I ( P < 0.05 ) , and there were no significant difference in the incidences of sinus brachycardia ( 30 % vs 15 % ) and hypotension ( 20 % vs 10 % ) ( P > 0.05 ) .