Cardiovascular Physiology
in Acute Care

• Calculate mean arterial pressure (MAP) and interpret it against the perfusion threshold for organ viability
• Distinguish the four shock states — hypovolemic, cardiogenic, distributive, obstructive — from bedside findings alone
• Explain preload, afterload, and contractility and how each is manipulated at the bedside
• Relate stroke volume and heart rate to cardiac output and to oxygen delivery (DO₂)
• Integrate the human exam — capillary refill, mentation, urine output, skin temperature — with monitored numbers
• Recognize when a monitored value is artifactual or misleading and resuscitate the patient instead of the waveform
• Appreciate how upstream cardiometabolic burden shapes the acute presentations the ward treats downstream

This module was developed from acute-care workflow analysis across North American emergency departments and intensive-care units — not from textbook theory alone. The modern monitor is a triumph: continuous arterial pressure, pulse oximetry, capnography, cardiac-output estimation, all on one glowing screen. WestNet HealthOS integrates every one of those feeds. And yet the most common failure we observe at the bedside is not a missing number. It is a clinician who has stopped looking at the patient.

Module 02 is not anti-monitoring. It is anti-monitor-worship — the habit of treating the displayed value as the patient, charting the trend without touching the skin, and chasing a pressure target while the human beneath the cuff slips quietly into shock the numbers have not yet caught.

Hemodynamic monitoring exists to extend the senses, not to replace them. A blood-pressure cuff reports a pressure; it cannot tell you whether the kidney is making urine, whether the brain is adequately perfused, or whether the skin over the knee is warm or mottled. Those answers live in the patient. On a busy unit at 3 AM, a normal-looking number on a screen can lull a tired clinician into missing a body that is already compensating its way toward collapse.