Isolated Left Bundle Branch Block in a Toddler
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Introduction
Isolated LBBB has been widely described in adult literature. Previous studies have postulated that it is an independent predictor of mortality and confers a risk similar to that of conventional cardiac risk factors. However, electrocardiographic analysis of large cohorts of healthy children has failed to identify this entity. This discrepancy may be due to the fact that adults are predisposed to age related degeneration of the conduction system or may have undetected ischemic or valvular heart disease or cardiomyopathy, which is uncommon in children. Chiu et al. studied cardiac conduction disturbances in 432,166 children and mentioned 1 case with isolated LBBB. However no further description or follow-up of this case is mentioned in the article.

Case Report
A 27-month-old African American female was brought to the emergency room within an hour of a questionable exposure to 1-2 pills of sustained release Nifedipine 30?mg tablets. Two tablets of Nifedipine were found missing in the grandmother's medication bottle following which she performed blind finger sweeps and retrieved some partially dissolved pill fragments from the patient's mouth. The child was alert and in no distress. Vitals' signs were stable: temperature: 98.1°F, heart rate: 109/minute, respiratory rate: 26/minute, and blood pressure: 116/69?mmHg.....

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4052074/
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