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1) Respiration and the QRS amplitude,  2) U waves,  3) Accelerated AV junctional rhythm,  4) Heart block and pacemaker,  5) Osborn wav

1) TdP vs Polymorphic VT,  2) ST elevation in aVL,  3) ST elevation in aVR,  4) Posterior STEMI,        5) Acute left circumflex occlusion,  6) Pericarditi

PVC morphology, standard ventricular pacing on ECG, biventricular pacing on ECG, reciprocal ST changes, Osborn waves, action potential duration, flecainide, propafenone, sinoventricular conduction

right ventricular hypertrophy (RVH), right-sided precordial tracings, negative P waves (with normal PR) in lead 1 and aVL, ostium primum atrial septal defect, ostium secundum ASD

p wave, right atrial overload, left atrial overload, cardiac pacing (failure to capture and failure to sense), tricyclic overdose, respiratory sinus arrhythmia

QRS in 2° type 1 AV block vs. QRS in 2° type 2 AV block, right axis deviation, atrial fibrillation in WPW syndrome, class 1 antiarrhythmic

tall R wave in V1, dominant R wave in aVR, poor R wave progression, complete vs. incomplete RBBB, Wolff-Parkinson-White pattern vs. syndrome, prevalence of WPW

cerebral disturbance and ECG change, ventricular tachycardia versus SVT with wide QRS, Brugada syndrome, causes of right bundle branch block

ventricular tachycardia, SVT with wide QRS, AV junctional rhythm, inferior MI, wandering atrial pacemaker, multifocal atrial tachycardia, sotalol, shortened QT interval

AV nodal reentrant tachycardia (AVNRT), multifocal atrial tachycardia (MAT), Verapamil, left anterior hemiblock (LAFB), right-left arm lead reversal, bifascicular block, trifascicular block

atrial depolarization, PR segment, electrical alternans, pericardial effusion, cardiac tamponade, left anterior fascicular block (LAFB), wide QRS at the HIS bundle, accelerated idioventricular rhythm (AIVR)

Sgarbossa criteria, T waves of bundle branch block, digitalis (digoxin) toxicity, ventriculophasic sinus arrhythmia, J point, hypercalcemia, Wolff-Parkinson-White (WPW), Kent bundle

Accelerated Idioventricular Rhythm, wide QRS supraventricular tachycardia vs ventricular tachycardia, adenosine, causes of wide QRS SVT, antidromic and orthodromic atrioventricular reentrant tachycardia (AVRT), atrial flutter, preexcitation syndrome, WPW, LGL, Mahaim fibers

renal failure, entrance block, parasystolic focus vs. premature ventricular contractions, tall T waves, Romhilt-Estes criteria for left ventricular hypertrophy, short QT interval

capture beat, atrioventricular dissociation, complete heart block, entrance block, fusion beat, echo beat, delayed onset of intrinsicoid deflection (delayed R wave peak time)