Welcome to our JULY 29 issue of #JACCCaseReports @JACCJournals featuring Part 2 of the EKG Challenge jacc.org/journal/case-report…. Full PDF here: jacc.org/doi/10.1016/S2666-0… Thank you @aroniskn our Associate Editor for this Editor’s Page: Clues, Not Patterns: The Electrocardiogram as a Detective Story jacc.org/doi/10.1016/j.jacca… @minnowwalsh @hmkyale @Justine_Turco Wide-Complex Tachycardia: VT and VT Mimics Wide-Complex Tachycardia in a Neonate jacc.org/doi/10.1016/j.jacca… Atypical Andersen–Tawil Syndrome in an Asymptomatic Child With Bidirectional Ventricular Tachycardia and Incipient Tachycardiomyopathy jacc.org/doi/10.1016/j.jacca… An Extreme Wide-Complex Tachycardia and Tremors jacc.org/doi/10.1016/j.jacca… Seamless Transition Between Narrow- and Wide-QRS Tachycardia Revealing Double Tachycardia jacc.org/doi/10.1016/j.jacca… AVNRT With Intermittent Aberrancy-Mimicking Ventricular Tachycardia: One Tachycardia, Two QRS Morphologies jacc.org/doi/10.1016/j.jacca… Atrial Tachycardia and Bundle Branch Re-Entry Ventricular Tachycardia with Similar QRS Complex Morphology jacc.org/doi/10.1016/j.jacca… Irregularly Irregular Wide Complex Tachycardia: Look Beyond the Atrium jacc.org/doi/10.1016/j.jacca… Ventricular Tachycardia or Not?: Decoding Post-Cardioversion Wide Complex Tachycardia in a CRT-D Patient jacc.org/doi/10.1016/j.jacca… Device Interrogation Unmasking Flecainide-Induced Wide Complex Tachycardia jacc.org/doi/10.1016/j.jacca… Wide QRS Tachycardias With Syncope: Two for One? jacc.org/doi/10.1016/j.jacca… ST-Segment Deviation Patterns and STEMI Mimics Takotsubo Cardiomyopathy With Dynamic LVOT Obstruction Mimicking Inferior STEMI jacc.org/doi/10.1016/j.jacca… Atrial Repolarization as a Rare Mimicker of ST-Segment Elevation Myocardial Infarction: Revisiting Ta jacc.org/doi/10.1016/j.jacca… Reading the ECG in Time: Ta-Wave Pseudo-STEMI and Crochetage Sign in Adult Congenital Heart Disease jacc.org/doi/10.1016/j.jacca… Shark-Fin Pattern in aVR Lead as First Manifestation of Acute Left Main Coronary Artery Occlusion jacc.org/doi/10.1016/j.jacca… “Left Main” Pattern Electrocardiogram: A Diagnostic Trap for Cardiologists jacc.org/doi/10.1016/j.jacca… Isolated Cardiac Rhabdomyoma With Marked ST-Segment Elevation: Benign Tumor, Malignant ECG jacc.org/doi/10.1016/j.jacca… Midventricular Hypertrophic Cardiomyopathy With Apical Aneurysm Presenting as Persistent ST-Segment Elevation Mimicking Acute Myocardial Infarction jacc.org/doi/10.1016/j.jacca… ST-Segment Elevation Caused by Lung Cancer Mimicking STEMI jacc.org/doi/10.1016/j.jacca… ST-Segment Elevation in a Patient With Vocal Cord Cancer: A Great Mimicker jacc.org/doi/10.1016/j.jacca… A Dangerous Wave: Recognizing the Shark-Fin ECG Sign in STEMI jacc.org/doi/10.1016/j.jacca… Atrioventricular Block and Conduction A Premature Ventricular Complex as Both Culprit and Cure: Paroxysmal Intrinsic Atrioventricular Block jacc.org/doi/10.1016/j.jacca… Progressive Conduction Disease in a Mitochondrial Disorder jacc.org/doi/10.1016/j.jacca… From Ophthalmoplegia to Multilevel Atrioventricular Block: Timing Cardiac Device Therapy in Kearns–Sayre Syndrome jacc.org/doi/10.1016/j.jacca… Syncope and 2:1 Atrioventricular Block in a Middle-Aged Man jacc.org/doi/10.1016/j.jacca… Idiopathic 2:1 AV Block With Ventriculophasic Sinus Arrhythmia in a Young Male jacc.org/doi/10.1016/j.jacca… Mobitz Type I Progressing to High-Grade AV Block: Beyond Wenckebach jacc.org/doi/10.1016/j.jacca… Intermittent Simultaneous Antegrade Dual Nodal Conduction With Progressive Rate-Dependent Aberrancy jacc.org/doi/10.1016/j.jacca… Dual Atrioventricular Nodal Physiology in Sinus Rhythm: An Extraordinary Manifestation of a Common Substrate jacc.org/doi/10.1016/j.jacca… The Double Fire Phenomenon With Alternating Right Bundle Aberrancy jacc.org/doi/10.1016/j.jacca… Atrial Activation and the PR Interval: Pre-excitation and Impulse-Origin Puzzles The Many ECG Faces of Wolff-Parkinson-White Syndrome jacc.org/doi/10.1016/j.jacca… Left Ventricular Hypertrophy With Pre-Excitation: Thinking Beyond the Usual Hypertrophic Cardiomyopathy Diagnosis jacc.org/doi/10.1016/j.jacca… Evaluation of the Elusive Delta Wave in Intermittent Pre-excitation jacc.org/doi/10.1016/j.jacca… An Abrupt Doubling of Heart Rate jacc.org/doi/10.1016/j.jacca… Junctional Ectopic Tachycardia After Adult Cardiac Surgery jacc.org/doi/10.1016/j.jacca… Three Voices of the Atrium: A Unique Case Finding on a Neonate ECG jacc.org/doi/10.1016/j.jacca… Repolarization Abnormalities — T-Wave, QT and J-Wave Wellens’ Sign and Syndrome Detected With the Home Use of a Novel 12-Lead Electrocardiogram jacc.org/doi/10.1016/j.jacca… Macroscopic T-Wave Alternans in QTc Prolongation: A Warning Sign Before Torsades de Pointes jacc.org/doi/10.1016/j.jacca… Short QT Syndrome Masquerading as Lone Atrial Fibrillation: Hidden in Plain Sight jacc.org/doi/10.1016/j.jacca… A Reversible ECG Signature of Hypothermia jacc.org/doi/10.1016/j.jacca… QRS Axis, Localization and Artifact Posteroseptal RVOT PVCs in a Clockwise-Rotated Congenital Heart: A Left-Sided Illusion jacc.org/doi/10.1016/j.jacca… Northwest Axis on Electrocardiogram: Decoding an Unusual Cardiac Axis in a Young Patient jacc.org/doi/10.1016/j.jacca… Crochetage Sign on Electrocardiography as a Diagnostic Marker of Patent Foramen Ovale jacc.org/doi/10.1016/j.jacca… An Electrocardiographic Artifact Mimicking Pacemaker Malfunction jacc.org/doi/10.1016/j.jacca… This ECG Does Not Fit: Rethinking Left Ventricular Hypertrophy jacc.org/doi/10.1016/j.jacca… Pseudo-Infarction Reversal in Right Precordial Leads: ECG Evolution in Severe Pulmonary Hypertension jacc.org/doi/10.1016/j.jacca… @aroniskn @CraigBasman @JACabreraCardio @MiChen__ @aabha_divya @sarano_maurice @MarcEngels7 @Miho_Fukui_ @CardioOncCO @Nishaki1 @MMarinCuartas @ChrissyMD2000f @ACHDocTMoe @PanjrathG @jsaef1 @Kentso987 @m_taramasso @SyedZaidMD Author’s Handles: @mariaelisasales @BPushparaji @MattSegar @sudarshanballa @sthangjui @aronismd @luisreneps @DrAvinash_ @dlypourlis @dr__hunt @JustinMarkMD @jennyjlcao @abhishek_mbbs @MayoClinicC @MayoCVFellows @mazenkawji @stavrosstavrak1 @drdave0 @AishKamble67 @RobertHelmMD @YooTaeKyung1 @albcipri6 @LauraDemichiel