Question

Explain what the ECG representation of an enlarged right atrium would look like and explain why. Then, do the same for an enlarged left atrium with a normal-sized right atrium.

Answer 1

Ans) The presence of any ECG LAE criteria and the individual criterion of P > 0.11s were highly sensitive for CMR LAE, while the criteria P mitrale, P wave axis < 30°, and NPTF-V1 > 0.04s·mm were very specific, though poorly sensitive, for detecting CMR LAE.

- ECG RAE criteria were highly specific, though insensitive, for detecting anatomic RAE.

- The limited specificity of the most sensitive ECG criteria for anatomic atrial enlargement is consistent with the fact that P wave perturbations reflect changes in atrial conduction, which may be due to a variety of etiologies.

- Thus, the term atrial "abnormality" may be more appropriate than "enlargement" to describe such ECG findings.