Nerve Supply to the Heart / SA & AV Nodes / EKG
Nerve Supply to the Heart / SA & AV Nodes / EKG
Nerve Supply to the Heart / SA & AV Nodes / EKG
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Electrocardiogram (ECG or <strong>EKG</strong>)<br />
• composite of all action potentials of nodal and<br />
myocardial cells<br />
• detected, amplified and recorded by electrodes on<br />
arms, legs and chest<br />
0.8 second<br />
R<br />
R<br />
+1<br />
Millivolts<br />
0<br />
P wave<br />
T wave<br />
PQ<br />
segment<br />
ST<br />
segment<br />
PR<br />
interval<br />
Q<br />
S<br />
QT<br />
interval<br />
QRS interval<br />
–1<br />
Atria<br />
contract<br />
Ventricles<br />
contract<br />
Atria<br />
contract<br />
Ventricles<br />
contract
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