08 - o Arrhythmia is when it doesn’t happen on a good...

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EXSC 205 – 3/13/08 16:35 Electrocardiography (EKG) – electrical changes preceding contraction There’s an isoelectric line (to the right is time, upwards is amplitude (mV)) Little waves go up (like a normal curve) called a p-wave o P-waves are atrial depolarization Then it goes a bit below, spikes very high, goes a bit low and evens out again o The spikes are R o QRS complex – ventricular depolarization We see one more little wave go up (same as first wave), called a t-wave o T-wave – ventricular repolarization This all occurs in about .6 seconds Distance between R shows how often heart beats o Normal sinus rhythm
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Unformatted text preview: o Arrhythmia is when it doesn’t happen on a good rhythm • If there’s no p-wave, it’s called premature ventricular contraction (PVC) • Ischemia – term for lack of blood • Fibrillation – no pattern, just looks like noise • Beta blockers – beta 2 antagonists EKG Test • Inject dye into femoral veins Diagnostic Potential • Purkinje fibers transmit electricity waves through the atria and ventricles There are also nodes (sino atrial node SA, atrio-venticular node (AV) Cardiac muscle • 1. Aerobic fibers • 2. Functional syncitium • 3. Intrinsic rhymicity 16:35 16:35...
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This note was uploaded on 03/24/2008 for the course EXSC 205 taught by Professor Girandola during the Spring '08 term at USC.

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08 - o Arrhythmia is when it doesn’t happen on a good...

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