Wiggers Diagram

The Wiggers Diagram is a detailed graphical representation of the cardiac cycle, correlating pressure, volume, and electrical changes with mechanical events. The handout provides essential information about cardiac function, visually demonstrating how the ventricles, heart valves, and other structures coordinate to maintain efficient blood flow. It serves as a comprehensive reference for students, educators, and healthcare professionals.

The pulmonary artery is depicted in the Wiggers Diagram handout as the vessel carrying deoxygenated blood from the right ventricle to the lungs during the ejection phase of the cardiac cycle. The diagram illustrates how rising right ventricular pressure forces the heart valves open, ensuring smooth blood flow to the pulmonary circuit.

The Wiggers Diagram handout identifies the source and timing of heart sounds. The first sound (S1) corresponds to the onset of ventricular systole, marked by the closure of the atrioventricular valves. The second sound (S2) occurs when the semilunar valves close at the end of ventricular systole. These sounds are clearly linked to the mechanical events shown in the diagram, helping users understand their significance in valve function and heart activity.