Semilunar Valves — ECG/EKG Terminology

Definition: The valves (aortic and pulmonary) that prevent backflow from the arteries into the ventricles.

Key Facts

• Includes aortic and pulmonary valves at ventricular outflow tracts.
• Open during systole and close in diastole based on pressure gradients.
• Prevent retrograde flow from arteries into ventricles.

ECG Connection: Outflow valve disease may produce secondary chamber strain patterns on ECG.

Why It Matters: Unexpected rhythm instability in valvular disease should prompt timely escalation.