Tricuspid or pulmonic stenosis is indicated by what type of wave in a CVP tracing?

The presence of cannon A waves in a central venous pressure (CVP) tracing is indicative of tricuspid or pulmonic stenosis. Cannon A waves occur when there is a disruption in the timing of the atrial contraction relative to the ventricular contraction, which can happen due to increased pressures that hinder proper blood flow through the valves. In cases of tricuspid and pulmonic stenosis, the restricted outflow from the right atrium can lead to these prominent cannon A waves.

This pattern arises because the atria contract against a closed or narrowed valve, resulting in a notable increase in atrial pressure that is reflected in the CVP tracing as tall, peaked waves. Recognizing cannon A waves is crucial in clinical practice because it provides insights into the underlying cardiac issues, enabling appropriate evaluation and management.

In contrast, A waves typically represent normal atrial contraction with no obstruction, B waves are related to respiratory changes, and V waves are associated with ventricular filling. Thus, the distinctive features of cannon A waves in this context help distinguish the specific pathophysiological condition affecting the tricuspid or pulmonic valve.