Research Article
Volume 12 Issue 9 - 2020
Transient Cardiovascular Responses to Passive Up and Down of Lower Extremities in Supine Position
Kenji Nemoto1, Takayo Kaiho2, Akira Maki1,3*, Susumu Ito3 and Koichi Yoshioka1
1Graduate School of Emergency Medical Systems, Kokushikan University, Tokyo, Japan
2Department of Health Science, Health Science University, Tokyo, Japan
3High-Tech Research Centre, Kokushikan University, Tokyo, Japan
*Corresponding Author: Akira Maki, Graduate School of Emergency Medical Systems, Kokushikan University, Tokyo, Japan.
Received: July 14, 2020; Published: August 18, 2020




Abstract

Objective: The purpose of this study is to clarify the characteristics of the phasic component of cardiovascular responses to the passive raising and lowering of the legs in the supine position.

Methods: Cardiovascular variables were measured continuously using a noninvasive finger blood pressure measurement system in 8 healthy male subjects, and transient responses to leg-up and leg-down in supine position at 20° and 40° leg lifted angles were compared.

Results and Discussion: Phasic cardiovascular responses lasting tens of seconds to leg-up and leg-down were observed. Responses to leg-up at 20° consisted of transient increases in heart rate (HR) and total peripheral resistance (TPR), with concomitant responses in other cardiovascular variables. The transient increase in TPR was slightly delayed to that of heart rate and followed by a slower transient decrease from the base level. The transient responses to the leg-down were similar to the leg-up with slight differences, if any. Dependencies on the elevation angle were also small, except for lowering the legs from 40°, where TPR decreased immediately without an initial transient increase. These transient responses triggered by the passive movement of the legs were probably caused by the autonomic nervous reflex, although it is not clear whether they are triggered by the hemodynamic alteration by the movement of the legs or by the sensory stimulation of the body surface. The change in the response pattern of the 40° leg-down may indicate the existence of an additional factor contributing to the TPR response.

Conclusion: Passive elevation and re-flattening of the legs caused transient cardiovascular responses in addition to tonic responses during leg lift. The pattern of transient cardiovascular responses was relatively indifferent to the direction of upward or downward movement, nor to the lifting angle of the legs, except in the leg-down from a 40° angle of the leg lift.

Keywords: Cardiovascular Function; Passive Leg-Raising; Total Peripheral Resistance

References

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Citation: Kenji Nemoto., et al. “Transient Cardiovascular Responses to Passive Up and Down of Lower Extremities in Supine Position”. EC Neurology 12.9 (2020): 35-41.

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