ShockCal Review

High-Yield Hemodynamics Review

A bedside teaching view of how heart rate, stroke volume, arterial compliance, resistance, and diastolic runoff change the pressure tracing.

This is a reduced-order educational model. It does not replace validated monitoring, clinical judgment, or institutional protocols.

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Predicted Target State

Diastolic pressure -- mmHg --
Mean arterial pressure -- mmHg --
Cardiac output -- L/min --

Arterial Pressure Runoff

BaselineTarget HR

Calibration Snapshot

Arterial compliance--
RC time constant--
Modeled baseline MAP--

High-Yield Takeaways

  • Diastolic pressure is strongly shaped by how long the arterial tree has to run off between beats.
  • For a fixed stroke volume, slowing the heart rate can lower cardiac output even when each beat still ejects the same volume.
  • MAP is tied to flow and resistance: MAP - CVP approximates cardiac output times systemic vascular resistance.
  • Real patients compensate through vascular tone, contractility, venous return, autonomic reflexes, valves, rhythm, and afterload.
CO = HR x SV MAP - CVP = CO x SVR P(t) - CVP = (P0 - CVP)e^(-t/RC) Pulse pressure approx SV / C
Arterial Windkessel review 0-D and 1-D blood-flow models Cardiac output physiology Diastolic time and heart rate