Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
76 Atrial flutter with 2:1 conduction: leads II, III, V1Atrial flutter with 2:1 conduction: leads II, III, V1Knowledge Weavers ECG
77 Pacemaker lead wire placement diagram - marquettePacemaker lead wire placement diagram - marquetteKnowledge Weavers ECG
78 Frontal and horizontal plane lead diagramFrontal and horizontal plane lead diagramKnowledge Weavers ECG
79 ST segment diagram - marquetteST segment diagram - marquetteKnowledge Weavers ECG
80 Atrial bigeminy - marquetteAtrial bigeminy - marquetteKnowledge Weavers ECG
81 Right Bundle Branch BlockRight Bundle Branch BlockKnowledge Weavers ECG
82 2nd degree AV block, type I, with accelerated junctional escapes and a ladder diagramThe ladder diagram illustrates a Wenckebach type AV block by the increasing PR intervals before the blocked P wave. After the blocked P wave, however, a rev-ed up junctional pacemaker terminates the pause. Note that the junctional beats have a slightly different QRS morphology from the sinus beats...Knowledge Weavers ECG
83 Atrial tachycardia with exit block and AV blockThe ectopic P waves, easily seen in this example,occur in groups, separated by short pauses. This is likely due to an exit block just distal to the atrial pacemaker. Because not all of the P waves make it to the ventricles, there is also 2nd degree AV block. Therefore, two levels of block are pre...Knowledge Weavers ECG
84 LVHIn this example of LVH, the precordial leads don't meet the usual voltage criteria or exhibit significant ST segment abnormalities. The frontal plane leads, however, show voltage criteria for LVH and significant ST segment depression in leads with tall R waves. The voltage criteria include 1) R in a...Knowledge Weavers ECG
85 A nonconducted PAC causes an unexpected pauseUnexpected pauses in rhythm have several causes, the most frequent being a nonconducted PAC. In this example the nonconducted PAC is seen in the ST segment of the pause. Note the change in the ST-T compared to the other ST-T waves.Knowledge Weavers ECG
86 Giant TU fusion wavesTU fusion waves are often seen in long QT syndromes. The differential diagnosis of this ECG abnormality includes electrolyte abnormalities -hypokalemia, CNS disease, e.g., subarachnoid hemorrhage; hereditary long QT syndromes, and drugs such as quinidine.Knowledge Weavers ECG
87 Left anterior fascicular block (LAFB)LAFB is the most common of the intraventricular conduction defects. It is recognized by 1) left axis deviation; 2) rS complexes in II, III, aVF; and 3) small q in I and/or aVL.Knowledge Weavers ECG
88 Atrial flutter with 2:1 AV conduction: lead V1The arrows point to two flutter waves for each QRS complex. Atrial rate = 280; ventricular rate = 140.Knowledge Weavers ECG
89 Long QT Interval and Giant Negative T WavesLong QT Interval and Giant Negative T WavesKnowledge Weavers ECG
90 Frontal plane QRS axis = -15 degreesFrontal plane QRS axis = -15 degreesKnowledge Weavers ECG
91 Ventricular pacemaker rhythmNote the small pacemaker spikes before the QRS complexes in many of the leads. In addition, the QRS complex in V1 exhibits ventricular ectopic morphology; i.e., there is a slur or notch at the beginning of the S wave, and>60ms delay from onset to QRS to nadir of S wave. This rules against a suprav...Knowledge Weavers ECG
92 Diffuse anterolateral T wave abnormalitiesDiffuse anterolateral T wave abnormalitiesT Wave AbnormalitiesKnowledge Weavers ECG
93 Frontal plane QRS axis = -45 degreesFrontal plane QRS axis = -45 degreesKnowledge Weavers ECG
94 Marked sinus arrhythmia - marquetteMarked sinus arrhythmia - marquetteKnowledge Weavers ECG
95 Muscle tremor artifact - marquetteMuscle tremor artifact - marquetteKnowledge Weavers ECG
96 RBBB + LAFB: bifascicular blockRBBB + LAFB: bifascicular blockKnowledge Weavers ECG
97 ECG of the century: A most unusual 1st degree AV blockOn Day 1, at a heart rate of 103 bpm the P waves are not clearly defined suggesting an accelerated junctional rhythm. However, on Day 2, at a slightly slower heart rate the sinus P wave suddenly appears immediately after the QRS complex. In retrospect, the sinus P wave in Day 1 was found burried i...Knowledge Weavers ECG
98 RBBB plus mobitz II 2nd degree AV blockThe classic rSR' in V1 is RBBB. Mobitz II 2nd degree AV block is present because the PR intervals are constant. Statistically speaking, the location of the 2nd degree AV block is in the left bundle branch rather than in the AV junction. The last QRS in the top strip is a junctional escape, since...Knowledge Weavers ECG
99 Left axis deviation: QRS axis = -60 degreesLead aVR is isoelectric; leads II and III are mostly negative. The QRS axis, therefore, is -60 degrees.Knowledge Weavers ECG
100 QRS axis = +30 degreesLead III is isoelectric; leads I and II are positive. The QRS axis, therefore, is +30 degrees.Knowledge Weavers ECG
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