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https://heartlab.it/assets/images/ecg-glossary/ablation-ecg-heartlab.png ECG: Ablation - HeartLab A procedure that uses heat (radiofrequency) or cold (cryoablation) to destroy small areas of heart tissue causing abnormal rhythms. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/artifact-ecg-heartlab.png ECG: Artifact - HeartLab Unwanted electrical signals on an ECG caused by patient movement, poor electrode contact, or electrical interference — not representing true cardiac activity. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/asystole-ecg-heartlab.png ECG: Asystole - HeartLab Complete absence of electrical activity in the heart, appearing as a flat line on the ECG. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/atrial-fibrillation-afib-ecg-heartlab.png ECG: Atrial Fibrillation (AFib) - HeartLab The most common sustained arrhythmia. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/atrial-flutter-ecg-heartlab.png ECG: Atrial Flutter - HeartLab A macro-reentrant atrial tachycardia producing characteristic 'sawtooth' flutter waves (F waves), typically at ~300 bpm with a regular ventricular rate (often 150 bpm with 2:1 block). Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/av-block-ecg-heartlab.png ECG: AV Block - HeartLab Impaired conduction between the atria and ventricles. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/axis-ecg-heartlab.png ECG: Axis - HeartLab The net direction of ventricular depolarization in the frontal plane. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/bazett-formula-ecg-heartlab.png ECG: Bazett Formula - HeartLab The most widely used QTc correction formula: QTc = QT / √RR. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/bigeminy-ecg-heartlab.png ECG: Bigeminy - HeartLab A pattern where every other beat is a premature complex (PAC or PVC), creating a regular coupling of normal and premature beats. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/bradycardia-ecg-heartlab.png ECG: Bradycardia - HeartLab A heart rate below 60 beats per minute. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/brugada-syndrome-ecg-heartlab.png ECG: Brugada Syndrome - HeartLab A genetic channelopathy causing characteristic ST elevation in leads V1–V3 with a 'coved' or 'saddle-back' pattern. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/bundle-branch-block-bbb-ecg-heartlab.png ECG: Bundle Branch Block (BBB) - HeartLab Delayed conduction through the right (RBBB) or left (LBBB) bundle branch, producing a widened QRS complex (≥120 ms) with characteristic morphology patterns. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/calibration-ecg-heartlab.png ECG: Calibration - HeartLab Standard ECG calibration is 10 mm/mV (vertical) and 25 mm/sec (paper speed). Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/capture-beat-ecg-heartlab.png ECG: Capture Beat - HeartLab During ventricular tachycardia, a beat where the SA node manages to depolarize the ventricles normally through the AV node, producing a narrow QRS complex. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/concordance-ecg-heartlab.png ECG: Concordance - HeartLab In wide complex tachycardia, positive or negative concordance (all precordial leads deflecting in the same direction) strongly suggests ventricular tachycardia. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/couplet-ecg-heartlab.png ECG: Couplet - HeartLab Two consecutive premature beats (PACs or PVCs) in a row. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/delta-wave-ecg-heartlab.png ECG: Delta Wave - HeartLab A slurred upstroke at the beginning of the QRS complex, characteristic of Wolff-Parkinson-White (WPW) syndrome, indicating ventricular pre-excitation via an accessory pathway. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/depolarization-ecg-heartlab.png ECG: Depolarization - HeartLab The electrical process by which cardiac cells become positively charged, triggering contraction. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/ectopic-beat-ecg-heartlab.png ECG: Ectopic Beat - HeartLab A heartbeat originating from an abnormal location — atrial (PAC), junctional, or ventricular (PVC) — rather than the sinoatrial node. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/einthovens-triangle-ecg-heartlab.png ECG: Einthoven's Triangle - HeartLab The theoretical equilateral triangle formed by the three bipolar limb leads (I, II, III), with the heart at the center. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/electrical-alternans-ecg-heartlab.png ECG: Electrical Alternans - HeartLab Beat-to-beat alternation in QRS amplitude. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/fibrillation-ecg-heartlab.png ECG: Fibrillation - HeartLab Chaotic, uncoordinated electrical activity. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/fusion-beat-ecg-heartlab.png ECG: Fusion Beat - HeartLab A QRS complex resulting from simultaneous ventricular activation by two sources (e.g., normal conduction and a ventricular ectopic focus), producing an intermediate morphology. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/heart-rate-variability-hrv-ecg-heartlab.png ECG: Heart Rate Variability (HRV) - HeartLab The variation in time intervals between consecutive heartbeats (RR intervals). Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/hemiblock-ecg-heartlab.png ECG: Hemiblock - HeartLab Block of one of the two fascicles of the left bundle branch. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/holter-monitor-ecg-heartlab.png ECG: Holter Monitor - HeartLab A portable, continuous ECG recording device worn for 24–48 hours to detect intermittent arrhythmias, ST changes, or conduction abnormalities not captured on a standard ECG. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/hypertrophy-ecg-heartlab.png ECG: Hypertrophy - HeartLab Thickening of the heart muscle. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/interpolated-pvc-ecg-heartlab.png ECG: Interpolated PVC - HeartLab A premature ventricular complex that falls between two normal sinus beats without disturbing the sinus rhythm or creating a compensatory pause. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/isoelectric-line-ecg-heartlab.png ECG: Isoelectric Line - HeartLab The flat baseline of the ECG tracing when no electrical activity is occurring. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/j-point-ecg-heartlab.png ECG: J Point - HeartLab The junction between the end of the QRS complex and the beginning of the ST segment. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/junctional-rhythm-ecg-heartlab.png ECG: Junctional Rhythm - HeartLab A cardiac rhythm originating from the AV junction (rate 40–60 bpm). Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/lead-ecg-heartlab.png ECG: Lead - HeartLab An ECG 'viewpoint' of cardiac electrical activity. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/long-qt-syndrome-lqts-ecg-heartlab.png ECG: Long QT Syndrome (LQTS) - HeartLab A condition of prolonged ventricular repolarization (QTc > 470 ms in males, > 480 ms in females) that increases risk of Torsades de Pointes. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/multifocal-atrial-tachycardia-mat-ecg-heartlab.png ECG: Multifocal Atrial Tachycardia (MAT) - HeartLab An irregular tachycardia with ≥3 different P wave morphologies and varying PP, PR, and RR intervals. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/myocardial-infarction-mi-ecg-heartlab.png ECG: Myocardial Infarction (MI) - HeartLab Heart attack — death of myocardial tissue due to prolonged ischemia. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/normal-sinus-rhythm-nsr-ecg-heartlab.png ECG: Normal Sinus Rhythm (NSR) - HeartLab The normal heart rhythm originating from the sinoatrial node: regular rate 60–100 bpm, upright P waves in leads I, II, aVF, consistent PR interval (120–200 ms), and narrow QRS (<120 ms). Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/non-sustained-vt-nsvt-ecg-heartlab.png ECG: Non-sustained VT (NSVT) - HeartLab Three or more consecutive ventricular beats at a rate ≥100 bpm lasting less than 30 seconds that terminates spontaneously. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/p-wave-ecg-heartlab.png ECG: P Wave - HeartLab The first positive deflection on a normal ECG, representing atrial depolarization. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/pac-premature-atrial-complex-ecg-heartlab.png ECG: PAC (Premature Atrial Complex) - HeartLab An early heartbeat originating from an ectopic atrial focus. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/pr-interval-ecg-heartlab.png ECG: PR Interval - HeartLab The time from the beginning of the P wave to the beginning of the QRS complex, representing atrioventricular conduction time. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/pvc-premature-ventricular-complex-ecg-heartlab.png ECG: PVC (Premature Ventricular Complex) - HeartLab An early heartbeat originating from the ventricles. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/pericarditis-ecg-heartlab.png ECG: Pericarditis - HeartLab Inflammation of the pericardium producing diffuse ST elevation (concave up) and PR depression across multiple leads, often with reciprocal PR elevation in aVR. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/q-wave-ecg-heartlab.png ECG: Q Wave - HeartLab The initial negative deflection of the QRS complex before the R wave. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/qrs-complex-ecg-heartlab.png ECG: QRS Complex - HeartLab The ECG waveform representing ventricular depolarization. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/qt-interval-ecg-heartlab.png ECG: QT Interval - HeartLab The time from the start of the Q wave to the end of the T wave, representing total ventricular electrical activity (depolarization + repolarization). Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/r-wave-ecg-heartlab.png ECG: R Wave - HeartLab The first positive deflection of the QRS complex. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/r-on-t-phenomenon-ecg-heartlab.png ECG: R-on-T Phenomenon - HeartLab A PVC falling on the T wave of the preceding beat, occurring during the 'vulnerable period' of repolarization. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/repolarization-ecg-heartlab.png ECG: Repolarization - HeartLab The process by which cardiac cells return to their resting electrical state after depolarization. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/rr-interval-ecg-heartlab.png ECG: RR Interval - HeartLab The time between two consecutive R waves, used to calculate heart rate. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/sinus-arrhythmia-ecg-heartlab.png ECG: Sinus Arrhythmia - HeartLab A normal variation in heart rate that occurs with breathing — heart rate increases with inspiration and decreases with expiration. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/sinus-tachycardia-ecg-heartlab.png ECG: Sinus Tachycardia - HeartLab Normal sinus rhythm with a rate >100 bpm. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/st-segment-ecg-heartlab.png ECG: ST Segment - HeartLab The interval between the end of the QRS (J point) and the beginning of the T wave. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/supraventricular-tachycardia-svt-ecg-heartlab.png ECG: Supraventricular Tachycardia (SVT) - HeartLab A rapid heart rhythm (>100 bpm) originating above the ventricles — includes AVNRT, AVRT, atrial tachycardia, atrial flutter, and atrial fibrillation. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/t-wave-ecg-heartlab.png ECG: T Wave - HeartLab The wave following the QRS complex, representing ventricular repolarization. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/torsades-de-pointes-ecg-heartlab.png ECG: Torsades de Pointes - HeartLab A polymorphic ventricular tachycardia occurring in the setting of prolonged QT interval. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/trigeminy-ecg-heartlab.png ECG: Trigeminy - HeartLab A pattern where every third beat is a premature complex (PAC or PVC), creating a repetitive normal-normal-premature grouping. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/u-wave-ecg-heartlab.png ECG: U Wave - HeartLab A small deflection sometimes seen after the T wave, most prominent in leads V2–V3. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/ventricular-fibrillation-vfib-ecg-heartlab.png ECG: Ventricular Fibrillation (VFib) - HeartLab A chaotic, lethal arrhythmia with no organized ventricular activity — appears as irregular, chaotic waveforms on ECG. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/ventricular-tachycardia-vt-ecg-heartlab.png ECG: Ventricular Tachycardia (VT) - HeartLab A rapid rhythm (≥100 bpm) originating from the ventricles with wide QRS complexes (≥120 ms). Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/wenckebach-mobitz-type-i-ecg-heartlab.png ECG: Wenckebach (Mobitz Type I) - HeartLab A second-degree AV block characterized by progressive PR prolongation until a P wave is not conducted (dropped QRS), then the cycle repeats. Free ECG Glossary by HeartLab. https://heartlab.it/assets/images/ecg-glossary/wolff-parkinson-white-wpw-ecg-heartlab.png ECG: Wolff-Parkinson-White (WPW) - HeartLab A pre-excitation syndrome caused by an accessory pathway (Bundle of Kent) connecting atria and ventricles. 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