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Terms in this set (14)
What are the conduction steps?
1. The SA node generates impulses, atrial excitation begins
2. impulses pause at AV node
3. AV bundle conducts the impulses to bundle branches
4. bundle branches conduct impulses through interventricular septum
5. subendocardial conducting network depolarizes contractile cells
What happens at the P wave?
atrial depolarization which results in atrial contraction
what happens after a P wave occurs?
atrial depolarization is complete, and the impulse is delayed at the AV node
what happens at the QRS complex?
ventricular depolarization begins at the apex, atrial repolarization occurs
directly after the QRS complex ________ occurs
ventricular depolarization is complete
what happens at the T wave?
ventricular repolarization begins at the apex
What is the P-R interval?
the interval between the start of P deflection to the start of Q deflection, last about 0.16 seconds any longer can indicate 1st degree heart block
what is the ST segment?
region between S deflection and the start of T wave, normally it is slightly elevated and last about 0.10 sec. If flat it indicates coronary ischemia and elevation may indicate heart attack
what does the SA node generate?
what does an enlarged R wave mean?
what does a prolonged Q-T interval mean?
increased risk of ventricular arrhythmias
what is myocardial infarction?
also known as heart attack, is a blockage of blood flow to the heart
what is the function of purkinje fibers?
relays cardiac impulses to ventricles, causing them to contract
what is fibrillation?
rapid uncoordinated heart contractions
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