The V wave is caused by the relaxation of the right atrium whilst the tricuspid valve is still closed. The relaxation of the right atrium combined with a closed tricuspid valve results in blood being drawn into the column of blood that begins at the right atrium and extends up to the IJV.
As blood is drawn into the column, whilst the tricuspid valve is closed, the level of the JVP is temporality increased. The Y descent occurs when the tricuspid valve opens, resulting in blood from the right atrium filling the right ventricle and blood from the SVC and IJV filling the right atrium.
This results in a decrease in the height of the column of blood and thus a decrease in the JVP. Clinical Examination. An Introduction to the Arclight. Eye Drops Overview.
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PSA Question Bank. Medical Student Finals Question Bank. ABG Quiz. Share Tweet. Last updated: November 12, Palpable pulsations. Pulsations obliterated by pressure above the clavicle. Pulsations not obliterated by pressure above the clavicle. Level of pulse wave decreased on inspiration; increased on expiration. No effects of respiration on pulse. Usually two pulsations per systole x and y descents.
Jugular Venous Pressure In this article Description How to examine jugular venous pressure Waveforms of jugular venous pressure How to differentiate a jugular venous pulse from the carotid pulse Hepatojugular reflux abdominojugular reflux sign Causes of raised jugular venous pressure Abnormalities of jugular venous pressure Prognostic use of jugular venous pressure. Waves [ 1 , 2 , 3 ] a - presystolic; produced by right atrial contraction.
Descents x - a combination of atrial relaxation, downward movement of the tricuspid valve and ventricular systole. The jugular venous pulse is: Not palpable. Obliterated by pressure. Characterised by a double waveform.
Variable with respiration - it decreases with inspiration. Enhanced by the hepatojugular reflux see below. Abnormalities of the a wave It disappears in atrial fibrillation. Large a waves occur in any cause of right ventricular hypertrophy pulmonary hypertension and pulmonary stenosis and tricuspid stenosis.
Extra large a waves called cannon waves in complete heart block and ventricular tachycardia. Prominent v waves Tricuspid regurgitation - called cv or v waves and occurring at the same time as systole a combination of v wave and loss of x descent ; there may be earlobe movement. Slow y descent Tricuspid stenosis. Right atrial myxoma.
Steep y descent Right ventricular failure. Constrictive pericarditis.
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