'Y' descent of the IVP is due to:
(Opening of the tricuspid valve): Ref: 1306-H, 569-G (1384-HI7th) (512- Ganong 23rd)Jugular venous pulse: (JVP)* Positive presystole 'a wave' is produced by venous distension due to right atrial contraction and is the dominant wave in the JVP.* Large 'a wave' indicates that the right atrium is contracting against an increased resistance (Tricuspid stenosis, pulmonary hypertension or PS)* Large 'a-wave' also occurs during arrhythmias whenever the right atrium contracts while the tricuspid valve is closed by right ventricular systole.* C-wave - produced by the bulging of the tricuspid valve into the right atrium during right ventricular isovolumetric systole and by the impact of the carotid artery adjacent to the jugular vein* "X-descent" is due to both to atrial relaxation and to the downward displacement of the tricuspid valve during ventricular systole* "V wave" results from the increasing volume of blood in the right atrium during ventricular systole when the tricuspid valve is closed.* "Y descent" produced mainly by the opening of the tricuspid valve and the subsequent rapid inflow of blood in the right ventricles. (Tricuspid regurgitation)
Atrial relaxation
Closure of the right ventricle
Opening of the triscuspid valve
Opening of the left ventricle
Heart, Circulation, and Blood