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cardiac terms

Heart rate normal resting heart rate for adults ranges from 60 to 100 beats per minute
Ejection fraction total amount of blood in the left ventricle is pumped out with each heartbeat.
Preload end diastolic volume that stretches the right or left ventricle of the heart to its greatest dimensions under variable physiologic demand
Afterload the pressure against which the heart must work to eject blood during systole
Cardiac output the amount of blood pumped by the heart per minute.
Cardiac index Cardiac Output ÷ Body Surface Area (BSA) 2.7 to 3.2 L/min/m2 BSA
Stroke volume amount of blood pumped by the left ventricle of the heart in one contraction.
Myocardial contractility the “strength” of contraction
SA Node the heart's natural pacemaker consists of a cluster of cells that are situated in the upper part of the wall of the right atrium (the right upper chamber of the heart). The electrical impulses are generated there.
AV Node controls the heart rate, is one of the major elements in the cardiac conduction system. The AV node serves as an electrical relay station, slowing the electrical current sent by the sinoatrial (SA) node before the signal is permitted to pass down through
Arrhythmia condition in which the heart beats with an irregular or abnormal rhythm
Bachmann's Bundle is a branch of the anterior internodal tract that resides on the inner wall of the left atrium
LAD anterior interventricular branch of left coronary artery, or anterior descending branch) is a branch of the left coronary artery. Occlusion of this artery is often called the widow-maker infarction due to a high death risk
P wave atrial depolarization befor every QRS
PR interval tracks the atrial impulse from the atria through the AV node, bundle of His, and right and left bundle branches .12 -.20 sec
QRS Interval Ventricular depolarization last 0.06-0.10seconds
ST Segment represents the end of ventricular conduction or depolarization and the beginning of ventricular recovery or repolarization. may vary from –0.5 to +1 mm in some precordial leads.
T Wave represents ventricular recovery or repolarization.
U Wave represents the recovery period of the Purkinje or ventricular conduction fibers. It isn’t present on every rhythm strip
QT Interval measures ventricular depolarization and repolarization. varies according to heart rate.
MAP indication of perfusion. Want at least 60 mmHg to provide enough blood to the coronary arteries, kidneys, and brain. The normal range is between 70 and 100 mmHg
Created by: tbarnable