<prompt> Which of the following is not true of a wave of venous pulsations in neck?Exaggerated in tricuspid stenosisAbolished in atrial fibrillationOccurs just after in carotid aeryExaggerated in complete hea block when P wave falls between QRS and T waves  <response>: There is no valve at the junction of superior vena cava SVC and right atrium RA therefore right atrial pressure changes are transmitted to the jugular vein in the neck. a wave is due to atrial systole. Some blood regurgitates into the great veins when atria contracts, even though the orifices of IVC and SVC are constricted. In addition veins inflow stops, causing the rise in venous pressure, contributing to the a wave. 