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What is A -wave in JVP indicates: and explain in detail?
Ans. B: Atrial contraction Waves - a - presystolic; produced by right atrial contraction - c - bulging of tricuspid valve into the right atrium during ventricular systole (isovolumic phase) - v - occurs in late ventricular systole; increased blood in right atrium from venous return Descents - x - combination of atrial relaxation, downward movement of the tricuspid valve and ventricular systole - y - tricuspid valve opens and blood flows in to the right ventricle Abnormal waveform causes Dominant a wave - Pulmonary stenosis - Pulmonary hypeension - Tricuspid stenosis Cannon a wave - Complete hea block - Paroxysmal nodal tachycardia Ventricular tachycardia Dominant v wave - Tricuspid regurgitation Absent x descent - Atrial fibrillation Exaggerated x descent - Cardiac tamponade - Constrictive pericarditis Sharp y descent - Constrictive pericarditis - Tricuspid regurgitation Slow y descent - Right atrial myxoma