Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
26 Multifocal PVC's - marquetteMultifocal PVC's - marquetteKnowledge Weavers ECG
27 Atrial flutter with 2:1 AV conductionIn this example of atrial flutter with 2:1 AV conduction the flutter waves are very hard to see. Atrial flutter with 2:1 block must be considered, however, because the heart rate is about 150 bpm. A careful look at V1 shows the two flutter waves for each QRS complex complex. One flutter wave imme...Knowledge Weavers ECG
28 Ventricular parasystoleIn ventricular parasystole, non-fixed coupled PVC's occur at a common inter-ectopic interval. Fusion beats, indicated by arrows, are often seen. Fusions occur when the sinus impulse entering the ventricles find the ventricles already partially depolarized by the parasystolic focus.Knowledge Weavers ECG
29 Atrial flutter with 2:1 and 4:1 conduction and rate dependent LBBBIn this example of atrial flutter with variable AV conduction, the faster rates are associated with rate-related LBBB. Don't confuse this for ventricular tachycardia.Knowledge Weavers ECG
30 2nd degree AV block, type I (Wenckebach)2nd degree AV block, type I (Wenckebach)Knowledge Weavers ECG
31 Diagram: stages of acute Q-wave MIDiagram: stages of acute Q-wave MIKnowledge Weavers ECG
32 Accelerated junctional rhythmAccelerated junctional rhythmKnowledge Weavers ECG
33 PVC's - marquettePVC's - marquetteKnowledge Weavers ECG
34 2nd degree AV block with junctional escapes and capturesSecond degree AV block is present; conducted beats are identified by those QRS's that terminate shorter cycles than the junctional escape cycle; i.e., the 3rd and probably the 4th QRS's are captures; the other QRS's are junctional escapes.Knowledge Weavers ECG
35 Atrial fibrillation with moderate ventricular response - MarquetteAtrial fibrillation with moderate ventricular response - MarquetteKnowledge Weavers ECG
36 Ventricular pacing in atrial fibrillation - marquetteVentricular pacing in atrial fibrillation - marquetteKnowledge Weavers ECG
37 Ventricular pacemaker: demand mode functioningVentricular pacemaker: demand mode functioningKnowledge Weavers ECG
38 Ventricular escape beat - marquetteVentricular escape beat - marquetteKnowledge Weavers ECG
39 LAFB: frontal plane leadsLAFB: frontal plane leadsKnowledge Weavers ECG
40 Old infero-posterior MIOld infero-posterior MIKnowledge Weavers ECG
41 2nd degree AV block, type IThe 3 rules of classic AV Wenckebach are: 1. decreasing RR intervals until pause; 2. the pause is less than preceding 2 RR intervals; and 3. the RR interval after the pause is greater than the RR interval just prior to pause. Unfortunately, there are many examples of atypical forms of Wenckebach wh...Wenckebach AV BlockKnowledge Weavers ECG
42 Atrial echosIn this example a typical Wenckebach sequence is interrupted by what looks like a PAC - indicated by red arrows. Atrial echos are more likely, however, because the preceding beat has a long PR interval, a condition that facilitates reentry and echo formation.Knowledge Weavers ECG
43 Anteroseptal MI with RBBB: precordial leadsAnteroseptal MI with RBBB: precordial leadsKnowledge Weavers ECG
44 Cardiac conduction system diagram - marquetteCardiac conduction system diagram - marquetteKnowledge Weavers ECG
45 ST segment depression: precordial leadsST segment depression: precordial leadsKnowledge Weavers ECG
46 Idioventricular escape rhythmIdioventricular escape rhythmKnowledge Weavers ECG
47 Unifocal PVCs - marquetteUnifocal PVCs - marquetteKnowledge Weavers ECG
48 Two Wrongs Sometimes Make a RightThe question mark is over a normal looking QRS that occurs during 2:1 AV block with RBBB. Following this QRS a ventricular escape rhythm takes over. The normal looking beat is actually a fusion beat resulting from simultaneous activation of the ventricles; the sinus impulse enters the left ventric...Knowledge Weavers ECG
49 WPW type preexcitationNote the short PR and the subtle delta wave at the beginning of the QRS complexes. The delta wave represents early activation of the ventricles in the region where the AV bypass tract inserts. The rest of the QRS is derived from the normal activation sequence using the bundle branches.Knowledge Weavers ECG
50 Long QT intervalThe QT interval duration is greater than 50% of the RR interval, a good indication that it is prolonged in this patient. Although there are many causes for the long QT, patients with this are at risk for malignant ventricular arrhythmias, syncope, and sudden death.Knowledge Weavers ECG
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