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Title | Description | Subject | Collection |
76 |
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ECG of the century - part II: dual AV pathways | An astute cardiology fellow, yours truly, went to the patient's bedside on Day 2 and massaged the right carotid sinus as indicated by the arrow. Four beats later at a slightly slower heart rate the PR interval suddenly normalized suggesting an abrupt change from a slow AV nodal pathway to a fast AV... | | Knowledge Weavers ECG |
77 |
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ECG of the century: A most unusual 1st degree AV block | On 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 |
78 |
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Electrical and mechanical events diagram - marquette | Electrical and mechanical events diagram - marquette | | Knowledge Weavers ECG |
79 |
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Electronic atrial pacing - marquette | Electronic atrial pacing - marquette | | Knowledge Weavers ECG |
80 |
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Electronic ventricular pacemaker rhythm - marquette | Electronic ventricular pacemaker rhythm - marquette | | Knowledge Weavers ECG |
81 |
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Extensive anterior/anterolateral MI: precordial leads | Extensive anterior/anterolateral MI: precordial leads | | Knowledge Weavers ECG |
82 |
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Extensive anterior/anterolateral MI: recent | Significant pathologic Q-waves (V2-6, I, aVL) plus marked ST segment elevation are evidence for this large anterior/anterolateral MI. The exact age of the infarction cannot be determined without clinical correlation and previous ECGs, but this is likely a recent MI. | | Knowledge Weavers ECG |
83 |
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First degree AV block - marquette | First degree AV block - marquette | | Knowledge Weavers ECG |
84 |
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Frontal and horizontal plane lead diagram | Frontal and horizontal plane lead diagram | | Knowledge Weavers ECG |
85 |
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Frontal plane QRS axis = +15 degrees | Frontal plane QRS axis = +15 degrees | | Knowledge Weavers ECG |
86 |
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Frontal plane QRS axis = +150 degrees (RAD) | This is an unusual right axis deviation (RAD). Lead I is negative, which usually means RAD. Lead II is the isoelectric lead, which almost always means -30 degrees; but in this example the axis is 180 degrees away from -30, or +150 degrees. | | Knowledge Weavers ECG |
87 |
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Frontal plane QRS axis = +30 degrees | Frontal plane QRS axis = +30 degrees | | Knowledge Weavers ECG |
88 |
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Frontal plane QRS axis = +50 degrees | 1) lead aVL is the smallest QRS and closest to being the isoelectric lead; 2) perpendiculars to aVL are +60 and -120 degrees; 3) lead I is positive; 4) therefore, the axis is closest to being +60 degrees. Because aVL is actually slightly positive, the axis is only about +50 degrees (i.e., slightly ... | | Knowledge Weavers ECG |
89 |
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Frontal plane QRS axis = +75 degrees | Since there is no isoelectric lead in this ECG, the two closest leads are I and aVL. If I were isoelectric, the axis would be +90 degrees; if aVL were isoelectric, the axis would be +60 degrees. A nice compromize is +75 degrees. (The two closest leads are always 30 degrees apart.) | | Knowledge Weavers ECG |
90 |
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Frontal plane QRS axis = +90 degrees | 1) Lead I is isoelectric; 2) perpendiculars to lead I are +90 and -90 degrees; 3) leads II, III, aVF are positive; 4) therefore, the axis must be +90 degrees. | | Knowledge Weavers ECG |
91 |
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Frontal plane QRS axis = -15 degrees | Frontal plane QRS axis = -15 degrees | | Knowledge Weavers ECG |
92 |
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Frontal plane QRS axis = -45 degrees | Frontal plane QRS axis = -45 degrees | | Knowledge Weavers ECG |
93 |
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Frontal plane QRS axis = -45 degrees | Frontal plane QRS axis = -45 degrees | | Knowledge Weavers ECG |
94 |
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Frontal plane QRS axis = -75 degrees | Frontal plane QRS axis = -75 degrees | | Knowledge Weavers ECG |
95 |
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Frontal plane QRS axis = 0 degrees | Frontal plane QRS axis = 0 degrees | | Knowledge Weavers ECG |
96 |
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Frontal plane QRS axis = 90 degrees | Frontal plane QRS axis = 90 degrees | | Knowledge Weavers ECG |
97 |
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Frontal plane lead diagram | The 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 |
98 |
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Frontal plane: accelerated junctional rhythm and inferior MI | Frontal plane: accelerated junctional rhythm and inferior MI | | Knowledge Weavers ECG |
99 |
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Fully evolved inferior MI: frontal plane | Fully evolved inferior MI: frontal plane | | Knowledge Weavers ECG |
100 |
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Giant TU fusion waves | TU 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 |