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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Abnormal <strong>Heart</strong> Rhythms<br />
• spontaneous firing from some part of heart o<strong>the</strong>r than <strong>the</strong> <strong>SA</strong><br />
node<br />
– ec<strong>to</strong>pic foci<br />
• region of spontaneous firing<br />
• nodal rhythm – if <strong>SA</strong> node is damaged, heart rate is set by<br />
<strong>AV</strong> node, 40 <strong>to</strong> 50 bpm<br />
• intrinsic ventricular rhythm – if both <strong>SA</strong> and <strong>AV</strong> nodes are<br />
not functioning, rate set by o<strong>the</strong>r myocardiocytes at 20 <strong>to</strong> 40<br />
bpm<br />
– Arrhythmia<br />
– this requires artificial pacemaker <strong>to</strong> sustain life long term<br />
• any abnormal cardiac rhythm<br />
• failure of conduction system <strong>to</strong> transmit signals (heart block)<br />
• bundle branch block<br />
• <strong>to</strong>tal heart block (damage <strong>to</strong> <strong>AV</strong> node)
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