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Unusual Results

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Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
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Electrocardiogram

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Electrocardiogram Fundamentals

Introduction
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Definition
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Related Experiment Video

Updated: Feb 5, 2026

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

An Unusual Electrocardiogram.

Richard G Trohman^1,2, Summer B Dewdney³, Parikshit S Sharma³

¹Division of Cardiology, the Department of Medicine, and the Department of Obstetrics and Gynecology, Rush University Medical Center, Chicago, IL, USA. rtrohman@rush.edu.

Pediatric Cardiology

|September 21, 2018

Summary

A patient

Keywords:

Anatomic variation Electrocardiography Lead reversal

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Last Updated: Feb 5, 2026

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Area of Science:

Cardiology
Medical Imaging
Electrocardiography

Background:

Electrocardiograms (ECG) are crucial for diagnosing cardiac conditions.
Variant cardiac anatomy can complicate ECG interpretation.
Standard ECG recording techniques may encounter pitfalls.

Observation:

A 56-year-old female presented with an ECG that differed significantly from prior recordings.
The discrepancy prompted an investigation into potential causes.

Findings:

Understanding variant cardiac anatomy was key to interpreting the ECG.
Awareness of common ECG recording errors helped identify the source of the difference.

Implications:

This case highlights the importance of considering anatomical variations in ECG analysis.
Proper ECG technique and anatomical knowledge are vital for accurate diagnosis.
Clinicians should be vigilant for potential recording errors when interpreting ECGs.