Jugular Venous Pulsations

A man in his mid-50s with exertional dyspnea and no significant medical history had jugular venous pulsations (JVP), illustrated in this video, while sitting upright. He had a pulsating liver with smooth edges palpable 4 cm below the costal margin and a diastolic murmur. What is the JVP pattern and its underlying cause? See link below for a complete description and discussion of the case.