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What is Giant 'a' waves in JVP occur in all except: and explain in detail?
Answer is C (Tricuspid Regurgitation) Tricuspid stenosis (not Tricuspid regurgitation) is associated with large or 'a' giant waves. `a' waves in JVP: Are positive waves, due to distension produced by Right atrial contraction. Large 'a' waves indicate atrium is contracting against increased resistance. Large 'a' waves : Tricuspid stenosis Pulmonary stenosis Pulmonary hypeension Cannon 'a' waves : Regularly - During junctional rhythm Irregularly - Atrioventricular dissociation with ventricular tachycardia - Complete hea block Absent `a' waves : Atrial fibrillation