It is the paradoxical rise in jugular venous pressure with inspiration.
Decreased intrathoracic pressure during inspiration normally leads to an increase in venous return to the right side of the heart, with an associated decrease in jugular venous pressure. When there is impaired filling of the right ventricle, the jugular veins instead become engorged.
_Causes of Kussmaul's sign include
- right ventricular infarction,
- severe right ventricular failure,
- restrictive cardiomyopathy,
- constrictive pericarditis, and
- tricuspid stenosis.
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