alternating current (AC) interference
Electrical interference that appears as small, uniform spikes on ECG tracing.
Device on the electrocardiograph that magnifies or enlarge the heart's electrical impulses so they can be recorded.
Abnormal heart rate, rhythm, and conductionsystem; also called dysrhythmia
Unwanted changes in an ECG tracing caused by movement, machine malfunction, or other factors.
Atrioventricular (AV) node
Knot of specialized cells in the lower portion of the right atrium that produces the heart's electrical impulses
Leads that measure cardiac activity from one electrode on the body at a time; recordings are augmented (made larger) so they can be read.
Line that separates the various cardiac waves
Standard limb leads
Branches of cardiac fibers that receive electrical impulses from the bundle of His.
Bundle of His
Small band of atypical cardiac muscle fibers that receive electrical impulses from the AV node
one heartbeat; one contraction/relaxtion phase of the heart
chest (precordial) leads
Leads that measure in only one direction.
Discharge of electrical energy that causes contraction, such as in heart muscle.
Graphic picture of the heart's electrical activity
Machine that records the electrical activity of the heart.
Noninvasive procedure used to detect the heart's electrical activity.
Devices made of a conductive material to pick up the electrical activity of the heart; sensors.
Forced vital capacity (FVC)
Measurement of the maximum volume of air that can be expired when the patient exhales forcefully.
Device that detects and converts the amplified electrical signal into a tracing on the ECG machine
Ambulatory heart monitor that records heart activity during a 24- to 48- hour period.
ECG pattern that shows the length of a wave with a segment.
Poor blood supply to body tissue causing a lack of oxygen to that tissue.
Covered wires that carry electrical impulses from the sensors to the ECG machine.
Myocardial infarction (MI)
Heart attack; death of heart tissue caused by blockage of the heart's blood vessels.
Normal sinus rhythm (NSR)
Rhythm measurement that starts at the SA node, occurs within an established time frame, and follows an expected, est pattern.
Device attached to a patient's finger that detects oxygen content in arterial blood
ECG pattern that shows atrial contraction originating at the SA node
Device that delivers electrical impulses to the heart muscle when the SA node is unable to do so
paroxysmal atrial tachycardia (PAT)
Sudden onset and ending of atrial tachycardial, 150 to 250 beats per min
Peak flow meter (PFM)
A hand-held device that measures expiratory flow.
Device that records the percentage of oxygen in the blood after a light source passes through arterial blood
Phase when the heart is in a ready state to contract
time interval from atrial contraction to ventricular contraction
Time interval necessary for an electrical impulse to cause contraction of the atria and begin contraction of the ventricles
Premature atrial contraction (PAC)
Condition in which an electrical impulse in the atria starts before the next expected heartbeat
Premature ventricular contraction (PVC)
Condition in which the ventricles receive an impulse prematurely and contract early
Pulmonary function tests (PFTs)
Tests done to assess lung function
Method to measure the amount of oxygen in a patient's blood
fibers from bundle branches that spread throughout ventricles carry electrical impulses, causing them to contract
ECG pattern that shows when the impulse moves through the ventricles and reaches the Purkinje fibers, depicting contraction of both ventricles
Time interval on ECG that shows the time needed for the ventricles to contract and recover
rest phase of the ECG cycle
Lead II recording on ECG that shows the hearts rhythm
ECG pattern between two waves
Sinoatrial (SA) node
Pacemaker of the heart, located in the right atrium
Slow heart rate, less than 60 beats per minute
Rapid heart rate, 100 to 180 beats per minute
Body tremor caused by voluntary or involuntary muscle movement
Type of test that measures lung volume and capacity over time
Time interval between the ventricular contraction and the beginning of ventricular relaxation
Standard limb lead
Device that carries the electrical impulses to the ECG and traces the electrical impulse of the heart in two different directions simultaneously
The process of making a test or procedure the same for everyone so that results can be compared to each other.
mark made on ECG paper that indicates the ECG is standardized
Heated device that records the heart's activity on heat sensitive graph paper
wave represents the Ventricles resting ;(repolarization)
recording of the ECG cycle.
The use of exercise during electrocardiography to examine heart function under stress
normal, small upward curve that occasionally follows a complete ECG cycle after the PQRST; has unknown indication.
Chest (precordial) leads
Disorganized, and ineffective twitching of the ventricles, resulting in no blood flow and a state of cardiac arrest
Three or more consecutive PVCs with heart rate exceeding 100 beats per minute
Measurement of the volume of air that can be expired when the patient exhales completely
Shift on the ECG tracing from the baseline or center of the paper
ECG pattern that represents specific electrical heart activity
How many leads on a standard ECG
Augmented limb leads
aVR, aVL, aVF