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19 Cards in this Set

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