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What is "a" wave in JVP indicates: and explain in detail?
A wave: Arc positive waves due to distention producedby right atrial contraction Large a waves: Indicate atrium is contracting against increased resistance tricuspid stenosis, pulmonary stenosis, pulmonary hypertension.
Cannon S waves
Regularly: During junctional rhythm. Irregularly: complete Heart Block. Absent a waves: Atrial Fibrillation