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Torsade in a patient with left bundle branch block: is there a long QT? (And: Left Bundle Pacing).

Dr. Smith's ECG Blog

EKG with paced complexes shown below shows much narrower QRS complex and echocardiogram showed improved LV systolic function primarily due to improvement in LV dyssynchrony. (J Even with tachycardia and a paced QRS duration of ~0.16 J Am Coll Cardiol.

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Wide Complex Tachycardia

EMS 12-Lead

Corresponding echocardiogram demonstrated LV systolic dysfunction with an EF 30%. Readers of the Smith ECG Blog will probably recognize this a very subtle inferior OMI. Ultimately the patient went to Cath and was found to have multi-vessel obstructive coronary disease with an acute LCX culprit vessel, which was stented.

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Tachycardia must make you doubt an ACS or STEMI diagnosis; put it all in clinical context

Dr. Smith's ECG Blog

He was rushed by residents into our critical care room with a diagnosis of STEMI, and they handed me this ECG: There is sinus tachycardia with ST elevation in II, III, and aVF, as well as V4-V6. ACS and STEMI generally do not cause tachycardia unless there is cardiogenic shock. He had this ECG recorded. Are the lungs clear?

STEMI 52
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Acute chest pain and ST Elevation. CT done to look for aortic dissection.

Dr. Smith's ECG Blog

This would have been fairly easy and much more expedient to diagnose with bedside echocardiogram. The constellation of dyspnea, tachycardia, and (relatively) low voltage on ECG should prompt immediate evaluation for pericardial effusion and tamponade.

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A 40-something woman with acute pulmonary edema -- see the Speckle Tracking echocardiogram.

Dr. Smith's ECG Blog

Conventional algorithm interpretation: SINUS TACHYCARDIA ABNORMAL RHYTHM ECG Confirmed by over-reading physician Transformed ECG by PM Cardio: PM Cardio interpretation: OMI with Low Confidence Dr. Rob Reardon did a bedside echo using Speckle tracking. On arrival, lung ultrasound confirmed pulmonary edema (B lines).

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60-something with wide complex tachycardia: from where does the rhythm originate?

Dr. Smith's ECG Blog

Here is her ED ECG: Here is the ED physician's interpretation: IMPRESSION UNCERTAIN REGULAR RHYTHM, wide complex tachycardia, likely p-waves. LEFT BUNDLE BRANCH BLOCK [120+ ms QRS DURATION, 80+ ms Q/S IN V1/V2, 85+ ms R IN I/aVL/V5/V6] Comparison Summary: LBBB and tachycardia are new. This is clearly ventricular tachycardia.

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A man in his 40s with acute chest pain. What do you think?

Dr. Smith's ECG Blog

It's a very "fun" ECG, with initial ectopic atrial tachycardia (negative P waves in inferior leads conducting 1:1 with the QRSs), followed by spontaneous resolution to sinus rhythm. The emergent echocardiogram showed normal EF, no WMA, and normal valve function. What About the Tachycardia? Triage ECG: What do you think?