Cardiac Arrhythmias: Difference between revisions

Cardiac Arrhythmias (view source)

No change in size , 27 December 2012

585

edits

@@ Line 17: / Line 17: @@
 ===Phase 1: Early Rapid Repolarization===
-Immediately following rapid depolarization, the inactivation of the Na<sup>+</sup> channel (I<sub>Na</sub>) and subsequent activation of the outward K<sup>+</sup> channel (I<sub>TO</sub>) and the Na<sup>+</sup>/Ca<sup>2+</sup> exchanger produce a early rapid repolarization. Due to the limited role of the Na<sup>+</sup> channel in the upstroke of sinus node and AV node cells and the subsequent slower depolarization, this rapid repolarisation is not visible in their action potentials.
+Immediately following rapid depolarization, the inactivation of the Na<sup>+</sup> channel (I<sub>Na</sub>) and subsequent activation of the outward K<sup>+</sup> channel (I<sub>to</sub>) and the Na<sup>+</sup>/Ca<sup>2+</sup> exchanger produce a early rapid repolarization. Due to the limited role of the Na<sup>+</sup> channel in the upstroke of sinus node and AV node cells and the subsequent slower depolarization, this rapid repolarisation is not visible in their action potentials.
 ===Phase 2: Plateau===