Transcription 12/11/2025, 10:42:05 AM

Apuntes

• Major Events and Curves of the Cardiac Cycle **Isovolumic Contraction** - Isovolumic contraction - What is the heart doing? - Ventricles contracting → What does this say about pressure? - Increases - On the EKG, what wave does this correlate to? - QRS complex - What heart sound do you hear clinically at the beginning of this phase? - 1st heart sound **Isovolumic Relaxation** - Isovolumic relaxation - What is the heart doing? - Ventricles relaxing, pressure decreasing - When does this occur in the cycle? - After ventricular ejection and before the atrial systole **Ejection Phase** - Rapid Ventricular Ejection - What is the heart doing? - Ventricles contract (max pressure) → blood is flowing into the aorta - Aortic pressure is increasing - What is happening with ventricular volume? - Decreasing - On the EKG, what wave does this correlate to? - ST Segment - Which valve is open during this time? - Aortic Valve **Diastasis and Atrial Systole** - Diastasis - What occurs during this phase? - Slow filling of ventricles, atrial filling - Atrial Systole ...