CCRN Exam Notes

Which of the following does not predispose the patient to digitalis toxicity? Hyponatremia. Remember that potassium, calcium, and magnesium affect cardiac contractility, Which single lead is the most valuable for the diagnosis of ventricular tachycardia? V1 Cardio Sites of MIs Inferior MI - Right Coronary (RC), associated with papillarymuscle ruputure Indicative Changes: II, III, aVFReciprocal Changes: I, AVL Anterior MI - Left Anterior Descending (LAD), associated with ventricular septal ruputure (holosystic murmur) Indicative Changes: V2, V3, V4 Reciprocal Changes: II, III, AVF Septal Wall - Left Anterior Descending (LAD)Indicative Changes: V1 , sometimes V2 Reciprocal Changes: V5, V6 Lateral MI - Circumflex Artery Indicative Changes: I, AVL, V5, V6Reciprocal Changes: II, III, AVF Posterior Wall MI - Right coronary, if dominantIndicative Changes: V7, V8, V9 Reciprocal Changes: V1, V2, V3 **Remember posterior Wall MI has leads that are high numbers, post means after soassociate these two • murmur is loudest at the apex, and the clinical presentation is related to acute pulmonary edema.2 Cardiac Values3 Swanz gaz – measures pressure , cardiac output , and oxygen PAOP 6-12mmHg (left atrial pressures = left ventricular end-diastolic pressure)(aka left ventricular preload) PAWP (pulmonary artery wedge pressure) 4-12mmHG (in the pulmonaryartery), inflate for 3-5 seconds and will have direct measurement of from back pressure. PAOP or PAWP 4 = hypovolemic patientPAOP or PAWP 4 = hypervolemic p