201 - 225 of 248
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TitleDescriptionSubjectCollection
201 RBBB: Precordial leadsRBBB: Precordial leadsKnowledge Weavers ECG
202 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
203 Right Axis Deviation & RAE (P pulmonale): Leads I, II, IIIRight Axis Deviation & RAE (P pulmonale): Leads I, II, IIIKnowledge Weavers ECG
204 Right axis deviation: QRS axis = +130 degreesLead aVR is almost isoelectric; lead I is mostly negative, and lead III is very positive. The QRS axis, therefore, is +130 degrees. Note that the slightly more positive AVR moves the axis slightly beyond +120 degrees; i.e., closer to the + pole of the aVR lead.Knowledge Weavers ECG
205 Right Bundle Branch BlockRight Bundle Branch BlockKnowledge Weavers ECG
206 Right bundle branch block (RBBB)Right bundle branch block (RBBB)Knowledge Weavers ECG
207 Right Ventricular Hypertrophy (RVH) & Right Atrial Enlargement (RAE)In this case of severe pulmonary hypertension, RVH is recognized by the prominent anterior forces (tall R waves in V1-2), right axis deviation (+110 degrees), and P pulmonale (i.e., right atrial enlargement). RAE is best seen in the frontal plane leads; the P waves in lead II are >2.5mm in amplitud...Knowledge Weavers ECG
208 RV vs LV PVC's - marquetteRV vs LV PVC's - marquetteKnowledge Weavers ECG
209 SA exit block - marquetteSA exit block - marquetteKnowledge Weavers ECG
210 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
211 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
212 Sino-atrial exit block, type I or wenckebachThis example illustrates 2nd degree sino-atrial exit block. In type 1 S-A block the conduction time between sinus firing and atrial capture progressively prolong, but this cannot be seen on the ECG tracing; type I exit block is inferred if the P-P intervals gradually shorten before the pause and if...Wenckebach AV Block; Ladder DiagramKnowledge Weavers ECG
213 Sinus bradycardiaSinus bradycardiaKnowledge Weavers ECG
214 Sinus pause or arrest - marquetteSinus pause or arrest - marquetteKnowledge Weavers ECG
215 Sore thumbsTwo funny looking premature beats are seen in this rhythm strip. Beat A is preceded by a PAC which distorts the T wave, making this an aberrantly conducted PAC. Beat B is a PVC. The notch on the down slope of the QRS complex clearly identifies this as a PVC and not aberrancy.Knowledge Weavers ECG
216 ST segment depressionST segment depression is a nonspecific abnormality that must be evaluated in the clinical context in which it occurs. In a patient with angina pectoris ST depression usually means subendocardial ischemia and, unlike ST elevation, is not localizing to a particular coronary artery lesion.Knowledge Weavers ECG
217 ST segment depression: precordial leadsST segment depression: precordial leadsKnowledge Weavers ECG
218 ST segment diagram - marquetteST segment diagram - marquetteKnowledge Weavers ECG
219 Supernormal conduction: 2nd degree AV block with rare captures; accelerated ventricular rhythmThis complicated rhythm strip illustrates 'supernormal' conduction... a situation where conduction is better than expected. The ladder diagram shows that the accelerated ventricular rhythm prevents most of the sinus impulses from reaching the ventricles. Only appropriately timed sinus impulses rea...Knowledge Weavers ECG
220 three fates of PAC'sAs illustrated, PAC's can have three fates: PAC-1enters the ventricles and encounters no conduction delays, therefore causing a narrow QRS; PAC-2 occurs a little earlier and can't get through the AV junction, therefore beingnonconducted; PAC-3 seen inlead V1 makes it into the ventricles but encounte...Knowledge Weavers ECG
221 three fates of PAC's: 1. normal conduction; 2. aberrant conduction; 3. non-conductionthree fates of PAC's: 1. normal conduction; 2. aberrant conduction; 3. non-conductionKnowledge Weavers ECG
222 Trifascicular block: RBBB, LAFB, and mobitz II 2nd degree AV blockA nice example of trifascicular block: Lead V1 shows RBBB; Lead II is mostly negative with an rS morphology suggesting left anterior fascicular block. Since Mobitz II 2nd degree AV block is more often located in the bundle branch system, the only location left for this block is the left posterior ...Knowledge Weavers ECG
223 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
224 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
225 Unifocal PVCs - marquetteUnifocal PVCs - marquetteKnowledge Weavers ECG
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