This document provides an overview of cardiovascular physiology and ECG monitoring. It discusses the coronary circulation and conduction system of the heart. It describes the different cardiac cell types and their functions. Topics covered include the action potential, automaticity, conduction speed, the phases of the cardiac cycle, and pressure-volume loops. The document also discusses regulation of the cardiovascular system through neural mechanisms, hormones, and the renin-angiotensin-aldosterone system. Finally, it provides guidance on interpreting ECGs, including identifying rates, durations, abnormalities, and determining the location of myocardial infarction.