What is represented with a decreased "a" wave and a flying W on M-Mode?

Study for the CCI Echocardiography Test. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

A decreased "a" wave and a "flying W" appearance on M-Mode echocardiography typically indicate changes related to right atrial pressure and can be associated with pulmonary hypertension. The "a" wave represents atrial contraction, and a decrease suggests that the right atrium may not be effectively contracting against elevated pressures, which is a common finding in pulmonary hypertension.

The "flying W" pattern specifically reflects the altered movement of the tricuspid valve during diastole, where it may not fully close due to excessive pressure, demonstrating the classic changes seen in patients with increased pulmonary arterial pressure. This finding on M-Mode is significant for diagnosing pulmonary hypertension, as it correlates with the increased load on the right side of the heart and resultant hemodynamic changes.

Overall, the combination of a decreased "a" wave and the "flying W" appearance effectively signal the presence of pulmonary hypertension as the right heart struggles to maintain normal function under elevated pressure conditions.

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