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19 Cards in this Set
- Front
- Back
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which structure is replaced with a pacemaker A) AV node B) SA node
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SA node
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list elements of intrinsic conduction begining w/ SA
A) SA---->AV----->L/R bundle---->purkinje B)purkinjes---->SA---->AV----->L/R bundles |
SA---->AV----->L/R bundle---->purkinje
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what happens in cardiac cycle: during P wave
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atria depolarizes
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what happens in cardiac cycle b/4 P wave
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heart diastole
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what happens in cardiac cycle after P wave
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atria contracts
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what happens in cardiac cycle during QRS
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ventricle depolarize
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what happens in cardiac cycle after QRS wave (s-t interval)
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ventricle contracts
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what happens in cardiac cycle during T wave
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ventricle repolarizes
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extremely rapid but coordinated heart activity (atrial flutter=300BPM
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flutter
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heart rate below 60BPM
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bradycardia
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heart rate over 100BPM
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tachycardia
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region of dead myocardium that does not depolarize
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myocardium infarction
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very rapid uncoordinated myocardial activity
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fibrillation
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which would be more serious, atrial or ventricle fibrillation?
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ventricle
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Why is the impulse in intrinsic conduction system delayed
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allows complete atrial contraction before initial ventricular systole (contraction)
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what is the role of the nodal system
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1. ensures depolarization is an orderly manor from atrial to ventricle
2. accelerates and coordinates heart activity to effectively pump blood |
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define ECG
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recording electrical changes occurring suring heart activity
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why is ventricular fibrillation more serious than atrial
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ventricles bears major responsibility for ejecting blood from heart
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abnormal heart valves is detected better by auscultation than electrocardiography why
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valves are not part of depolarization path of heart, so ECG does not record...stethoscope can hear valves
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