right ventricular stroke volume decreases during inspiration because right ventricular preload decreases while right ventricular afterload increases.
left ventricular stroke volume increases during inspiration because left ventricular preload increases while left ventricular afterload decreases.The reverse occurs during mechanical ventilation, LV SV is lower during expiration > left heart filling reduced and lower stroke volume increase in negative intrathoracic pressure during inspiration.Pulse pressure = stroke volume / arterial compliance SVV or PPV >10% suggests that the patient is fluid responsiveness as indicates that stroke volume is sensitive to fluctuations in preload caused by the respiratory cycle.pulse pressure variation (PPV) = (PPmax – PPmin) / PPmean over a respiratory cycle or other period of time.Stroke volume variation (SVV) is calculated by taking the( SVmax – SVmin) / SVmean over a respiratory cycle or other period of time.
Other names for reverse pulsus paradoxus are paradoxical pulsus, respiratory paradox, systolic pressure variation and pulse pressure variation.Reverse pulsus paradoxus - occurs during controlled mechanical ventilation when arterial pressure rises during inspiration and falls during expiration due to changes in intra-thoracic pressure secondary to positive pressure ventilation.Pulsus paradoxus is a phenomenon in which the difference in systolic blood pressure (BP) between inspiration and expiration is more than 10 mmHg.
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