Cheng, J.H., Wang, S., Zhang, H.N., Jiao, F.B. and Zhang, L.F.
Posture shift alters pattern of heart rate and blood pressure response during valsalva maneuver
Journal of the Fourth Military Medical University, 22, (12), .
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Objective: To compare the different postures under the Valsalva maneuver, cardiovascular response patterns difference. Method in -15 ° head-down tilt, the level of supine and +75 ° head-up tilt three positions, respectively 4 kPa / 30s the Valsalva maneuver, by jumping and record heart rate and arterial blood pressure changes. results +75 ° head-up tilt posture, heart rate increased in phase II the largest in the Phase III was at the lower changes, and in the other two there was a higher position changes. blood pressure in the early phase II to reduce the margin in -15 ° head-down tilt posture, to the smallest, +75 ° head-up tilt posture, to the greatest. +75 ° head-up tilt posture under Phase III of blood pressure was elevated in response, In -15 ° head-down tilt and level under the supine position was typical lower blood pressure changes. postural changes phase II of the Valsalva maneuver heart rate, blood pressure response mode most affected. conclusions postural changes can cause central blood volume and redistribution of the balance of the autonomic nervous change, so the Valsalva maneuver, heart rate and blood pressure response patterns have an impact.
Aim: To examine the influence of posture shift on the pattern of heart rate and blood pressure response to Valsalva.
Methods: Thirty seconds Valsalva maneuver strains at 4 kPa were performed under -15° head-down tilt, supine or +75° head-up tilt posture, and the beat-by-beat changes of heart rate and blood pressure were noninvasively recorded and analyzed.
Results: The increasing change of heart rate for phase ? under +75° head-up tilt was beyond that under the other two postures. Under +75° head-up tilt, the heart rate decreased during phase ?, whereas under horizontal supine or -15° head-down tilt posture, the heat rate manifested an increasing change. The decreasing change of blood pressure during early phase ? was lowest under -15° head-down tilt, and highest under +75° head-up tilt. Blood pressure increased during phase ? under +75° head-up tilt, and decreased under other two postures.
Conclusion: Posture shift alters the response pattern of heart rate and blood pressure during Valsalva maneuver, by circulating blood volume redistribution and autonomic balance shift to sympathetic predomination.
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