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Cardiology Terms

Focus location from which impulse arises
Hypertrophy enlargement of portion of the heart without increase in chamber size
Infarction necrotic tissue due to sustained period of interrupted blood flow
Infranodal located within the SA or AV nodes
Injury portion of damaged myocardium capable of partial recovery
Inotropic influencing cardiac contractility and force
Ischemia reduced oxygenated blood flow to portion of cardiac tissue which may be transient or reversible with early treatment and intervention
Isoelectric flat line on EKG graph indicating no electrical variations
Multifocal describes PVC's that originate from multiple locations
Necrosis dead tissue from insufficient oxygenated blood flow
Paroxysmal sudden or abrupt onset of dysrhythmia
Pathologic indicating disease of abormality
Precipitating factors that contribute to a condition or disease state
Preload measurement of amount of tension on ventricular muscle fibers prior to contraction
Quadrigeminy ectopic beat occurring every fourth complex
Reciprocal refers to EKG changes observed in an opposite lead
Reentry source of ectopic beats caused by a single electrical impulse reentering portion of tissue for second or subsequent time
Refractory inability to respond to electrical impluses
Repolarization process by which a cell is restored to a ready state
Retrograde process by which a cell is restored to a ready state
Stroke volume amount of blood pumped by left ventricle each beat
Supraventricular refers to portion of heart from bundle branches to SA node
Systole contraction and subsequent movement of blood through ventricles
Tachycardia rapid heart rate, typically greater than 100 beats / minute
Thrombolytic substance that breaks down or dissolves a thrombus
Thrombosis blood clot within a vessel that has potential to restrict flow
"Tombstone T Wave" hyperacute T wave resembling the shape of a tombstone; often seen early in development of MI and usually associated with ST elevation
Transcutaneous refers to pacing patches applied to skin of chest wall
Transmural pertaining to infracted area penetrating through full thickness of myocardium
Transvenous internal pacemaker inserted directly into heart via vein
Trigimenal ectopic complex arising every third beat
Triphasic single waveform that has three observable phases
Unifocal arising from single ectopic focus
Vector magnitude and direction of wave of deplorization
Voltage height or depth of waveform measure in millimeters
Abberent occasional abnormal intraventricular conduction of supraventricular impulses
Accessory pathway abnormal conduction tract between the atria and ventricles
Action potential electrical changes in the myocardial cell membrane during the depolarization and repolarization of a cardiac cycle
Amplitude the height of a waveform or complex measured in millimeters on the ECG graph paper
Anterograde electrical conduction of an impulse in a forward direction
Antiarrythmic refers to medications that attempt to abolish, control or prevent dysrhythmias and ectopic impulses
Arteriosclerosis hardening of arteries and loss of elasticity
Atherosclerosis condition caused by an accumulation of debris along the intimal layer of arteries
Atrial kick normal contraction of the atria with movement of blood into the ventricles during diastole
Automaticity the ability of a cell to depolarize spontaneously
Automatic rate rate at which a dominant or escape pacemaker normally initiates electrical impulses
Axis position of the heart within the thoracic cavity
Bigeminy ectopic complexes occurring every other complex
Bipolar includes leads I, II and III. These leads record the potential between two points on the body; also called stranded limb leads
Bradycardia slow heart rate, typically less than 60 beats per minute
Capture appropriate timing of a pacemaker to depolarize the myocardium
Cardiac output the amount of blood pumped by the heart in one minute; measured in liters / minute; calculated by multiplying stroke volume by heart rate
Chronotropic influencing heart rate
Compensatory pause a pause following a premature complex which allows the SA node to continue at its preset rhythm
Conductivity property of a cardiac cell to transmit electrical impulses
Contractility ability of cardiac cells to shorten when stimulated
Couplet two consecutive PVC's
Demand pacemaker mode that initiates an impulse only upon failure of atria or ventricles to fire within a preset time
Depolarization electrical process of discharging a resting cardiac cell
Diastole period of relaxation of atria and ventricles; period where heart chambers and coronary arteries fill with blood
Diphasic refers to single waveform that has two observable phases
Dissociation occurs when pacemakers of atria and ventricles are functioning independently
Ectopic beat or rhythm originating from site other than SA node
Equiphasic QRS complex that is relatively equal in positive and negative deflections relative to isoelectric line
Escape complex or rhythm initiated when underlying rhythm slows to less than the escape pacemaker's automatic rate
Fascicle pertaining to intraventricular bundle brances
Created by: aimeewhite