Potassium leaves the cell resulting in the cell becoming increasingly negative; at 60-70 mV, the cell’s fast sodium channels begin to be receptive to causing

The polarized state of the cell with resting negative potential of approximately –90 mV; early in this phase, the sodium-potassium ATP pump restores the cell

Metabolism that utilizes oxygen is called aerobic metabolism. Energy production through oxygenation (with oxygen) yielding 32 ATP molecules from the interaction of one glucose and

The pressure that the ventricle (right or left) must overcome to eject blood (i.e. the left ventricle pumps against aortic diastolic pressure and systemic vascular

A fatal dysrhythmia with rates usually less than 20/minute and common widening of the QRS; also referred to as the dying heart. Asystole is characterized

The peripheral vasoconstriction that results from circulating catecholamines (epinephrine & norepinephrine). 1. Six Second ECG Guidebook (2012), T Barill, p. 190

The height or depth of waves and complexes of an ECG in millimetres; represents millivolts where 10 mm is 1 millivolt with a properly calibrated

Energy production without oxygen with only 2 ATP produced as well as lactic and pyruvic acid. When energy demands surpass the supply of vital energy

Chest discomfort – usually pressure or tightness – that results from a relative poor oxygen supply to cardiac tissue (ischemia). 1. Six Second ECG Guidebook

The left bundle branch splits into the septal, anterior and posterior fascicles. Normal ventricular depolarization begins with the septal fascicle of the left bundle branch

Poor R wave progression (i.e. not until leads V5 or V6) may signal an anterior infarction. In line with QRS axis deviation, abnormal R wave

Forward conduction of the electrical impulse across the atria & ventricles; the expected route of electrical conduction from top to bottom. 1. Six Second ECG

As a general rule, a patient experiencing a left ventricular infarction – anterior, lateral or anterolateral MI – should be managed with particular attention to