Run Time: 6 minutes
Author: Dr. Eric Miller
- The QT interval is the time from the depolarization of the ventricle through the repolarization of the ventricle. Long QT increases the risk for dangerous dysrhythmias.
- The QTC – the corrected QT interval – abnormal is over 440ms for men and 460ms for women.
- Several conditions can prolong the QT including low potassium, low magnesium, low calcium, certain cardiac medications, and genetics.
- Drugs can prolong QT such as certain antibiotics, antifungals, cardiac drugs, phenothiazines, and antihistamines. There is a strong recommendation to have the patient on monitor if giving these medications.
- Treatment w/ beta-blocker – adrenergic response is prevented. AICD also pretty effective at eliminating dysrhythmias.