<prompt> Plethoric non collapsible IVC on echocardiography denotes?Budd chiari syndromeHepatic venous malformationRight heart failureIVC thrombosis  <response>: Ans CIn Heart failure increasing IVC diameter is associated with a worse prognosis Q. The IVC diameter is a summary measure of cardiac function as well as a marker of venous congestion. Measurements of IVC collapse are commonly reported as the collapsibility index Q which is calculated as maximum IVC diameter on expiration - minimum IVC diameter on inspirationmaximum IVC diameter on expiration. Mean IVC diameter correlates with CVPQ. 