Optimal electrocardiographic limb lead set for rapid emphysema screening.
Rishi Bajaj1, Lovely Chhabra, Zainab Basheer
1Department of Internal Medicine, University of Massachusetts Medical School, Worcester, MA 01604, USA.
International Journal of Chronic Obstructive Pulmonary Disease
|February 5, 2013
Summary
A vertical P wave axis is linked to emphysema. Comparing electrocardiogram leads, a P wave in lead III greater than in lead I is a more sensitive indicator for diagnosing emphysema than a negative P wave in aVL.
Area of Science:
- Cardiology
- Pulmonology
- Electrocardiography
Background:
- Pulmonary emphysema is strongly associated with a vertical frontal P wave axis.
- A vertical P wave axis (>60 degrees) can be identified using specific electrocardiogram (ECG) lead criteria.
- Identifying the most effective ECG leads for this diagnosis is crucial.
Purpose of the Study:
- To compare the effectiveness of two limb lead criteria in identifying a vertical P wave axis in adult patients with emphysema.
- To determine which ECG lead set is superior for detecting the vertical P vector associated with emphysema.
Main Methods:
- Analysis of electrocardiograms from 100 adult patients diagnosed with emphysema.
- Exclusion of patients under 45, those not in sinus rhythm, or with poor quality ECGs.
- Categorization of frontal P wave axis based on two criteria: P wave in lead III > lead I, and negative P wave in aVL.
Main Results:
- A vertical P wave axis (>60 degrees) was identified in 88% of patients using the lead III > lead I criterion.
- Using the negative P wave in aVL criterion, a vertical P wave axis was identified in 66% of patients.
- The criterion of P wave in lead III greater than in lead I demonstrated higher sensitivity.
Conclusions:
- A P wave in lead III greater than in lead I is a more sensitive marker for diagnosing emphysema compared to a negative P wave in aVL.
- This finding is recommended for rapid routine screening of emphysema using ECGs.
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