What does a diphasic P wave typically indicate on an EKG?

What does a diphasic P wave typically indicate on an EKG?

• A. Atrial enlargement
• B. Ventricular hypertrophy
• C. Normal atrial electrical activity
• D. Arrhythmia

Answer: (A)

A diphasic P wave typically indicates atrial enlargement on an EKG. This is observed when the P wave has two distinct phases: an initial positive deflection followed by a negative deflection, or vice versa. The presence of a diphasic P wave often suggests that the atria are undergoing changes due to conditions such as atrial dilation or hypertrophy, commonly associated with factors like hypertension or valvular heart disease.

In the case of atrial enlargement, the diphasic morphology can occur because the electrical activity is altered as a result of the increased size of the atria, reflecting abnormal conduction patterns. This finding can be indicative of left atrial enlargement particularly in specific leads, such as V1 and II. Other associated features may also include an increase in the amplitude or duration of the P wave.

Understanding the significance of P wave morphology helps in identifying underlying cardiac conditions early, facilitating appropriate management strategies.