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ecg basics dr salah mabrouk khallaf tachycardia cardiac axis lad rad calculation of cardiac axis hyperkalemia lvh rvh ow voltage ecg qrs complex- l- rvh -lvh - rbbb - lbbb heart block 3 degrees lgl syndrome wpw syndrome 兀乇卮丕丿丕鬲 賱賱賯卅 賵丕賱睾孬賷丕賳 賱賱毓賱丕噩 丕賱賰賷賲丕卅賷 chemotherpy nausea vomiting patient information thyroid cancer management salah mabrouk 爻乇胤丕賳 丕賱孬丿賷 丕賱賰卮賮 丕賱賲亘賰乇 丿賰 chemotherapy topoisomerase inhibitors diabetic ketoacidosis dr salah mabrouk cardiac chemotherapy keytruda bcg target therapy surgery bladder ischemia versus infarction inferior posterior lateral septal stage of mi fibrillation ventricular escape beat pvcs ventricular arrhythmias regular and irregular heart rate in ecg calculation of heart rate paroxysmal junctional sinus atrial bradycardia heart rate toxicity