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20 Cards in this Set
- Front
- Back
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P wave shows
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atrial depolarization
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Q wave shows
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ventricular depolarization
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R wave shows
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ventricular depolarization
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S wave show
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late depolarization of ventricle base
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T wave shows
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repolarization of ventricles
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PQ interval shows
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atrial depolarization/AV node delay
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ST segment shows
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ventricles depolarized
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TP interval shows
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heart diastole
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QT interval shows
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ventricular electrical and mechanical activity.
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sinus rhythm is
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the normal rhythm generated by SA node
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bradycardia
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below normal HR, caused by increased vagal tone; Ach
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tachycardia
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higher than normal HR caused by stimulation of sympathetic nervous system
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sinus arrhythmia
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a condition in which HR increases during inspiration and decreases during expiration
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sinus bradycardia
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occurs when resting HR falls below 40 bpm, due to decreased activity of the SA node OCCURS NORMALLY IN DIVING MAMMALS AND BIRDS (reduces O2 consumption)
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Bundle branch block would show a greatly prolonged _______ interval on ECG
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QRS; impulse travels on only one branch of purkinje system
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Ischemia
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condition resulting from insufficient oxygen supply; T wave is inverted
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Infarct
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region of damaged cardiac muscle, replaced by scar tissue which cannot be excited or conduct impulses; elevated S-T segment
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Left ventricle hypertrophy
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due to high blood pressure; large amplitude S-Waves in limb leads II and III
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Right ventricle hypertrophy
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abnormally narrow pulmonary valve; large amplitude QRS in leads I and II
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Ectopic pacemaker potential
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can cause depolarization of the ventricles and result in a premature ventricular beat
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