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Title | Description | Subject | Collection |
176 |
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Atrial tachycardia with 3:2 AV block | In 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 |
177 |
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Ventricular fusion beats | Fusion 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 |
178 |
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Diagram: digitalis effect on rhythm and conduction | Diagram: digitalis effect on rhythm and conduction | | Knowledge Weavers ECG |
179 |
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Calibration signal - marquette | Calibration signal - marquette | | Knowledge Weavers ECG |
180 |
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Old inferior MI | Old inferior MI | | Knowledge Weavers ECG |
181 |
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Second degree AV block, type I, with 3:2 conduction ratio | There 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 |
182 |
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Infero-posterior MI with RBBB | This 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 |
183 |
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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 |
184 |
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Frontal plane: accelerated junctional rhythm and inferior MI | Frontal plane: accelerated junctional rhythm and inferior MI | | Knowledge Weavers ECG |
185 |
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QRS axis = -30 degrees | Lead II is isoelectric; I is positive; III is negative. The axis is -30 degrees. | | Knowledge Weavers ECG |
186 |
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Voltage criteria for LVH | Voltage criteria for LVH | | Knowledge Weavers ECG |
187 |
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Infero-posterior MI | Infero-posterior MI | | Knowledge Weavers ECG |
188 |
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RBBB - marquette | RBBB - marquette | | Knowledge Weavers ECG |
189 |
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Second degree AV block, type I, with bradycardia-dependent RBBB | An 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 |
190 |
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Bifascicular block: RBBB + LAFB | This 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 |
191 |
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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 |
192 |
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Anteroseptal MI: fully evolved | The 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 |
193 |
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Atrial parasystole | The 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 |
194 |
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Ventricular tachycardia - marquette | Ventricular tachycardia - marquette | | Knowledge Weavers ECG |
195 |
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Long QT Iinterval | Long QT Interval | | Knowledge Weavers ECG |
196 |
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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 |
197 |
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Left Atrial Enlargement & Nonspecific ST-T Wave Abnormalities | LAE is best seen in V1 with a prominent negative (posterior) component measuring 1mm wide and 1mm deep. There are also diffuse nonspecific ST-T wave abnormalities which must be correlated with the patient's clinical status. Poor R wave progression in leads V1-V3, another nonspecific finding, is als... | | Knowledge Weavers ECG |
198 |
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Atrial flutter with 3:2 AV conduction | This 12-lead ECG shows a subtle bigeminal rhythm resulting from atrial flutter with a 3:2 AV conduction ratio; RR intervals alternate by a small duration. This is uncommon! The impulses from the atrial flutter conduct through the AV junction in a Wenckebach sequence; for every 3 flutter waves the s... | | Knowledge Weavers ECG |
199 |
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A very subtle 1st degree AV block | Where are the P waves??? They are hiding in the T waves as indicated by the arrows. How do we know? The PVC unmasked the sinus P wave, and now it is seen in the pause following the PVC. The PR interval is, therefore, about 500 ms. | | Knowledge Weavers ECG |
200 |
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PAC's with and without aberrant conduction - marquette | PAC's with and without aberrant conduction - marquette | | Knowledge Weavers ECG |