electrocardiogram

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16 Terms

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p wave

atrial depolarization

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q wave

conduction through bundle branches

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r wave

conduction through purkinje fibers at apex

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s wave

conduction through purkinje fibers at base

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t wave

ventricular repolarization

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u wave

repolarization of papillary muscles

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pr interval

0.18 sec; atrial depolarization and conductance of impulse through AV node to bundle of his

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pr segment

0.04 sec; stim is delayed in bundle of his to allow atria enough time to pump blood into ventricles

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qrs complex

0.08-0.10 sec; atrial repolarization and ventricular depolarization

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qt interval

atrial repolarization and ventricular depolarization/repolarization

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st segment

0.1 sec; no conductance (isoelectric)

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st interval

0.32 sec; ventricular repolarization

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tp interval

0.24 sec; isoelectric time between t and p

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rr interval

beat period (length of one heartbeat)

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heart rate

number of times the heart beats per minute

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sinoatrial (SA) node

pacemaker cell