during inspiration, the lower intrathoracic pressure favours the venous filling of the right ventricle more than the left
the relative overfilling of the right ventricle may compromise the lumen of the left ventricle resulting in a lower stroke volume and lower systolic pressure
pericardial tamponade:
increased intra-pericardial pressure during inspiration results in a compensatory increase in central venous pressure (Kussmaul's sign)
on the left side of the heart there is insufficient pressure to maintain the filling of the left ventricle: a low stroke volume results in a low systolic pressure
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