Wednesday, June 12, 2013

Cardiac Cycle

In this mind map is represented the VENTRICULAR cardiac cycle.
  • Focusing in the "ISRR" word that represents the 5 phases of the Ventricular cardiac cycle, the Atrial phase is not included (see Dr. Najeeb video).
    1. Isometric contraction (max. O2 consumption)
    2. Systolic ejection (rapid and slow phases)
    3. Isometric relaxation
    4. Rapid filling or rapid passive ventricular filling
    5. Reduced filling or slow passive ventricular filling
  • See the Aorta & Mitral valves icons and remember Aorta up - Mitral down in the house scheme.
  • Only the healthy valve sound are in closing, the opening of valves does not produce sounds.

A beautiful Cardiac Cycle explanation in this video by Dr. Najeeb


  1. Q: A 45-year-old-man comes to ED in hypovolemic shock after sustaining a severe gunshot wound. How do his preload and contractility compare to normal, and what is the effect on his cardiac output?

    A: Lookinh the minmap the CO depends of preload (filling), contractility, and afterload (aorta pressure). In this case the preload is decreasing for bleeding, and the contractility increases to compensate the bleeding, but the patient is in shock, so the preload is most severe (important) than contractility in this case, that's why the CO will be decreased.

  2. Q: What phase of cardiac cycle presents a positive rate of change of pressure (+dP/dt)?

    A: Phase 3 or isometric contraction.