NURS 4390 Lecture Notes - Lecture 8: Qt Interval, Pr Interval, Chest Pain
3 May 2020
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Looks at all parts of the heart and where something is happening. Lead 2 = easiest to look at because it"s going upright. Steps in rhythm interpretation: determine rate, determine regularity, analyze p waves, pr interval (0. 12-0. 20 sec, qrs (0. 04-0. 12 sec, qt interval (0. 34-0. 43 sec, what is the rhythm. Treatment: resolve underlying causes, pharmacologic: beta blockers (e. g. metropolol) or calcium channel blockers (e. g. cardizem) Some little spot in atrium is irritable and sets off impulse before sa node does. A bunch of p"s, delay at av node, if all the p"s go through the ventricle, all the heart would be too fast. Person can live this, but on drugs: coumadin, warfarin, prevent clots d/t pooling of blood in atrium. Newer drugs; dabigatran (pradaxa), rivaroxaban (xarelto: cardioversion. Transesophageal echocardiogram if there"s chance of clots due to increased risk of clots. More than three pvc"s in a row = ventricular tachycardia. Treat: beta blockers, procainamide, amiodarone, lidocaine, procainamide.
