Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
101 Pacemaker failure to sense - marquettePacemaker failure to sense - marquetteKnowledge Weavers ECG
102 Pacemaker fusion beat - marquettePacemaker fusion beat - marquetteKnowledge Weavers ECG
103 RAE & RVHRAE & RVHKnowledge Weavers ECG
104 Type II, 2nd degree sino-atrial blockTwo types of 2nd degree SA block have been described. In type-I, or SA Wenckebach, the P-P interval of the pause is less than 2x the preceding P-P intervals. In type-II SA block the P-P interval of the pause is approximately 2x the normal P-P interval. The distinction between types I and II is no...Knowledge Weavers ECG
105 Bradycardia-dependent LBBB with carotid sinus massageWhen carotid sinus massage slows the heart rate in this example, the QRS widens into a LBBB. This form of rate-dependent bundle branch block is thought to be due to latent pacemakers in the bundle undergoing phase 4 depolarization; when the sinus impulse enters the partially depolarized bundle, slow...Knowledge Weavers ECG
106 Atrial tachycardia with 3:2 AV blockIn this rhythm the atrial rate from an ectopic focus is 160 bpm. Atrial activity can be seen on top of T waves, and before QRS's. Careful observation reveals a 3:2 Wenckebach relationship between P waves and QRS's. Atrial tachycardia with block is often a sign of digitalis intoxication.Knowledge Weavers ECG
107 Ventricular fusion beatsFusion beats occur when two or more activation fronts contribute to the electrical event. These may occur in the atria or in the ventricles. In this example the ventricular fusions are the result of simultaneous activation of the ventricles from two foci, the sinus node and a ventricular ectopic...Knowledge Weavers ECG
108 Diagram: digitalis effect on rhythm and conductionDiagram: digitalis effect on rhythm and conductionKnowledge Weavers ECG
109 Calibration signal - marquetteCalibration signal - marquetteKnowledge Weavers ECG
110 Old inferior MIOld inferior MIKnowledge Weavers ECG
111 Second degree AV block, type I, with 3:2 conduction ratioThere are two types of 2nd degree AV Block. In this example of Type I or Wenckebach AV block there are 3 P waves for every 2 QRSs; the PR interval increases until a P wave fails to conduct. This is an example of group beating.Knowledge Weavers ECG
112 Infero-posterior MI with RBBBThis is an unusual RBBB because the initial R wave is taller than the R wave in lead V1. This is the clue for true posterior MI. The tall initial R wave in V1 is a pathologic R wave analagous to the pathologic Q wave of an anterior MI.Knowledge Weavers ECG
113 Right Atrial Enlargement (RAE) & Right Ventricular Hypertrophy (RVH)RAE is recognized by the tall (>2.5mm) P waves in leads II, III, aVF. RVH is likely because of right axis deviation (+100 degrees) and the Qr (or rSR') complexes in V1-2.Knowledge Weavers ECG
114 Frontal plane: accelerated junctional rhythm and inferior MIFrontal plane: accelerated junctional rhythm and inferior MIKnowledge Weavers ECG
115 QRS axis = -30 degreesLead II is isoelectric; I is positive; III is negative. The axis is -30 degrees.Knowledge Weavers ECG
116 Voltage criteria for LVHVoltage criteria for LVHKnowledge Weavers ECG
117 Infero-posterior MIInfero-posterior MIKnowledge Weavers ECG
118 RBBB - marquetteRBBB - marquetteKnowledge Weavers ECG
119 Second degree AV block, type I, with bradycardia-dependent RBBBAn interesting and unusual form of rate-dependent bundle branch block. Normal sinus rhythm at 85 bpm is present with a 3:2 and 2:1 2nd degree AV block. The progressive PR prolongation in the 3:2 block makes this a type-I or Wenckebach block.Long cycles end in RBBB; short cycles have normal QRS dur...Knowledge Weavers ECG
120 Bifascicular block: RBBB + LAFBThis is the most common of the bifascicular blocks. RBBB is most easily recognized in the precordial leads by the rSR' in V1 and the wide S wave in V6 (i.e., terminal QRS forces oriented rightwards and anterior). LAFB is best seen in the frontal plane leads as evidenced by left axis deviation (-50...Knowledge Weavers ECG
121 Frontal plane lead diagramThe six frontal plane leads are illustrated with their respective positive and negative poles.When forced to intersect at a center point, the six leads inscribe a 360 degree circle. The normal frontal plane axis is from -30 degrees to + 90 degrees, shaded in grey. Left axis deviation is from -30 d...Knowledge Weavers ECG
122 Anteroseptal MI: fully evolvedThe QS complexes, resolving ST segment elevation and T wave inversions in V1-2 are evidence for a fully evolved anteroseptal MI. The inverted T waves in V3-5, I, aVL are also probably related to the MI.Knowledge Weavers ECG
123 Atrial parasystoleThe evenly spaced dots indicate ectopic atrial activity from a parasystolic atrial pacemaker. Non-fixed coupled PACs are seen having a common inter-ectopic interval. One of the PACs is nonconducted.Knowledge Weavers ECG
124 Ventricular tachycardia - marquetteVentricular tachycardia - marquetteKnowledge Weavers ECG
125 Long QT IintervalLong QT IntervalKnowledge Weavers ECG
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