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cardiac terms

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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  


   


 
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Created by: tbarnable