Wiggers Diagram Explained | Cardiac Cycle Animation | NEET PG & USMLE

The Wiggers diagram is one heartbeat told four ways: pressure, volume, electricity (ECG) and sound. Watch the left heart beat beside the graph it draws, and learn the one rule that runs it: valves move when pressures cross. Covers: the four valve events in order, isovolumic contraction and relaxation, rapid and slow ejection, the a, c and v waves, S1 to S4, the incisura (dicrotic notch), EDV, ESV, stroke volume and ejection fraction, and the pressure-volume loop. Chapters 0:00 The Wiggers diagram, one heartbeat four ways 0:34 The one rule: valves move when pressures cross 1:20 One beat on a clock (0.8 s at 75 bpm) 1:55 Atrial systole and the a wave 2:39 Isovolumic contraction and S1 3:48 Ejection, stroke volume and ejection fraction 4:49 The v wave 5:07 Isovolumic relaxation, S2 and the incisura 6:06 Filling: rapid filling, diastasis, atrial kick 7:02 The whole Wiggers diagram 7:53 The pressure-volume loop 8:41 Murmur timing and the right heart 9:12 Recap Facts: Guyton & Hall, Textbook of Medical Physiology, 11th ed., Ch. 9. Cross-checked with Ganong's Review of Medical Physiology, Klabunde's Cardiovascular Physiology Concepts and StatPearls. Values differ slightly between textbooks; ranges are noted on screen. All diagrams drawn for MedLearn. For education only, not medical advice. Also on MedLearn: Mechanism of Normal Labour, animated    • Mechanism of Labour, Animated | Cardinal M...   MedLearn: animated, textbook-referenced lessons for NEET PG, INI-CET, MBBS, USMLE, nursing and allied health students. Subscribe for the next topic. #physiology #cardiaccycle #wiggersdiagram #neetpg #usmle #mbbs #medicalstudent