Why the study?
Does passive increase of airway pressure produce a different arterial pressure response compared to a Valsalva manoeuvre in anaesthetized patients?
Does passive increase of airway pressure produce a different arterial pressure response compared to a Valsalva manoeuvre in anaesthetized patients?
The normal Valsalva blood pressure response may be partly due to reflexes from isotonically contracting respiratory muscles, as passive airway pressure increases produce a different arterial pressure response.
Answers are grounded in this paper and cite their sources.
Different arterial pressure responses to passive airway pressure versus Valsalva in anesthetized patients; leaves open the contribution of respiratory muscle reflexes to normal Valsalva hemodynamics.
Passive increase of the airway pressure in anaesthetized patients resulted in a different pattern of arterial pressure response from that observed in the same subjects performing a Valsalva manoeuvre at the same airway pressure beforehand. Thoracotomy had no effect on the response, suggesting that the changes observed in systemic blood pressure result from direct interference with pulmonary blood flow at alveolar-capillary level. It is also suggested that the normal Valsalva blood pressure response is due in part to reflexes arising from the isotonically contracting respiratory muscles.
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SCOTT et al. (1969) studied this question.
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