A 40-year-old female with end-staged renal failure on continuous ambulatory peritoneal dialysis was admitted for fluid overload. Dialysis regime was intensified but without significant improvement in fluid status. She was also found to have persistent sinus tachycardia and hypotension. Physical examination showed elevated JVP up to earlobes, and positive Kussmaul sign.

Heart sound was not muffled but a vague rub was heard. What could be the most probable diagnosis for this condition? * This image based case is from Docplexus editorial team for educative purpose only. Source: Haymarket