Trick of the Trade: Speed up ECG paper rate to differentiate tachycardias

Undifferentiated tachycardias, especially when the rate is extremely fast, make it difficult to see anything other than the QRS complexes! Is there a P or flutter wave?
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By Michelle Lin, MD|2019-01-28T22:09:48-08:00Dec 11, 2012|ECG, Tricks of the Trade|

PV Card: Electrolytes and ECG changes

The electrocardiogram can pick up all sorts of electrolyte abnormalities. The most common abnormalities revolve around high and low levels of potassium and calcium. Magnesium derangements typically have nonspecific findings. How do you keep things straight? To make things more complicated, multiple electrolyte derangements can occur at the same time, making ECG interpretation challenging.

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By Michelle Lin, MD|2021-10-08T09:38:57-07:00Sep 21, 2012|ALiEM Cards, ECG, Endocrine-Metabolic|

What lead is the most overlooked on the ECG?

Answer: aVR Lead

This lead can provide some unique insight into 5 different conditions:

Acute MI
Pericarditis
Tricyclic antidepressant (TCA) and TCA-like overdose
AVRT in narrow complex tachycardias
Differentiating VT from SVT with aberrancy in wide complex tachycardias by using the Vereckei criteria (possibly better than Brugada criteria)

PV Card: The aVR Lead on ECG

Adapted from [1-4]
Go to ALiEM (PV) Cards for more resources.

References

Williamson K, Mattu A, Plautz C, Binder A, Brady W. Electrocardiographic applications of lead aVR. Am J Emerg Med. 2006;24(7):864-874. [PubMed]
Vereckei A, Duray G, Szénási G, Altemose G, Miller J. New algorithm using only lead aVR for differential diagnosis of wide QRS complex tachycardia. Heart Rhythm. 2008;5(1):89-98. [PubMed]
Kireyev D, Arkhipov M, Zador S, Paris J, Boden W. Clinical utility of aVR-The neglected electrocardiographic lead. Ann Noninvasive Electrocardiol. 2010;15(2):175-180. [PubMed]
Riera A, Ferreira C, Ferreira F, et al. Clinical value of lead aVR. Ann Noninvasive Electrocardiol. 2011;16(3):295-302. [PubMed]

By Michelle Lin, MD|2021-10-11T15:47:33-07:00Nov 18, 2011|ALiEM Cards, Cardiovascular, ECG|

Trick of the trade: Quieting the shaky EKG tracing

A patient with Parkinson’s disease presents with chest pain to your ED. Her tremors prevent you from getting a good quality EKG because of the movement artifact.

How can you eliminate this artifact? (No cheating with rocuronium.)

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By Michelle Lin, MD|2019-01-28T22:36:03-08:00Oct 11, 2011|ECG, Tricks of the Trade|

Paucis Verbis: Brugada syndrome

You always hear about it when working up syncope and sudden cardiac arrest in young patients, but it’s so easy to forget what it looks like on ECG. We so rarely see it… or DO we?!

This Paucis Verbis card on Brugada Syndrome is to help emblazon these ECG tracings in our mind, so that we don’t miss the subtle findings which place a patient at risk for sudden cardiac death. Pay special attention to Type 1, which is most specific for Brugada Syndrome.

PV Card: Brugada Syndrome

* Update 8/2/18: Only Type 1 and Type 2 are recognized for Brugada syndrome. The type 3 pattern is likely a normal variant.

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Adapted from [1]
Go to ALiEM (PV) Cards for more resources.

Reference

Antzelevitch C. Brugada Syndrome: Report of the Second Consensus Conference: Endorsed by the Heart Rhythm Society and the European Heart Rhythm Association. Circulation. 2005;111(5):659-670. doi:10.1161/01.cir.0000152479.54298.51

By Michelle Lin, MD|2021-10-15T11:04:55-07:00May 6, 2011|ALiEM Cards, Cardiovascular, ECG|

Paucis Verbis: AMI and ECG Geography

Sometimes a picture is worth MORE than a 1000 words. Such is the case of the above illustration that I saw on the Life In The Fast Lane blog. When I first saw it, I knew that I immediately had to find out who made the graphic. It turns out it is the multitalented Dr. Tor Ercleve, who is an emergency physician at Sir Charles Gairdner Hospital and an established medical illustrator.

This graphic demonstrates the EKG findings for the various types of acute MI’s as broken down by coronary vascular anatomy (right coronary artery, left circumflex artery, left anterior descending artery). This detailed illustration won’t be readable in print form but is great in digital format on your mobile device.

Thanks, Tor!

[PDF]

Go to ALiEM (PV) Cards for more resources.

By Michelle Lin, MD|2021-10-15T11:17:43-07:00Apr 8, 2011|ALiEM Cards, Cardiovascular, ECG|

Paucis Verbis: Right and posterior ECG leads

A standard 12-lead ECG can be very telling for patients with chest pain or shortness of breath. A right ventricular (RV) and posterior wall infarct, however, can present very subtly. You can obtain special right-sided (V1R-V6R) and posterior leads (V7-V9), if you are concerned. What are the indications for obtaining right-sided and posterior ECG leads?

Go to the ALiEM Cards for more resources.

Addendum 3/11/11:

Right sided ECG leads (V1R-V6R) are positioned in a mirror image fashion from the standard 12-lead precordial leads.

Posterior ECG leads (V7-V9) are applied by moving V4-V6 in the posterior positions.