Test II

purposeful destruction of heart muscle cells, usually inan attempt to control a dysrhythmia

a medication that suppresses or prevents a dysrhythmia

ability of the cardiac cells to initiate an electricalimpulse

electrical current administered in synchrony withthe patient’s own QRS complex to stop a dysrhythmia

rate of impulse formation

transmission of electrical impulses from one cell toanother

electrical current administered to stop a dys-rhythmia, not synchronized with the patient’s QRS complex

process by which cardiac muscle cells changefrom a more negatively charged to a more positively chargedintracellular state

conduction velocity

disorder of theformation or conduction (or both) of the electrical impulsewithin the heart, altering the heart rate, heart rhythm, or bothand potentially causing altered blood flow

a device implantedinto the chest to treat dysrhythmias

in reference to pacemakers, term used to describe thepacemaker withholding an impulse (not firing)

force of myocardial contraction

the part of an electrocardiogram (ECG) that reflectsconduction of an electrical impulse through the atrium; atrialdepolarization

a dysrhythmia that has a sudden onset and/or termination and is usually of short duration

the duration between the beginning of one P waveand the beginning of the next P wave; used to calculate atrialrate and rhythm

the part of an ECG that reflects conduction of anelectrical impulse from the sinoatrial (SA) node through theatrioventricular (AV) node

an agent (eg, a medication) that causes or exacerbates a dysrhythmia

the part of an ECG that reflects conduction of an elec-trical impulse through the ventricles; ventricular depolarization

the part of an ECG that reflects the time from ven-tricular depolarization through repolarization

process by which cardiac muscle cells return to a more negatively charged intracellular condition, their resting state

electrical activity of the heart initiated by thesinoatrial (SA) node

the part of an ECG that reflects the end of the QRScomplex to the beginning of the Twave

a rhythm that originates inthe conduction system above the ventricles

the part of an ECG that reflects the time between theend of the T wave and the beginning of the next P wave; usedto identify the isoelectric line

the part of an ECG that reflects repolarization of theventricles

in reference to pacemakers, term used to describe therelease of an impulse in response to some stimulus

the part of an ECG that may reflect Purkinje fiber repolarization; usually it is not seen unless a patient’s serumpotassium level is low

a rhythm that originates in the ventricles