What is the most significant factor of the EKG with saddleback type Brugada pattern?

The Brugada pattern on an EKG is characterized by a specific morphology that is a key feature in the diagnosis of Brugada syndrome, which is associated with an increased risk of ventricular arrhythmias and sudden cardiac death. The most significant factor of the saddleback type Brugada pattern is the presence of an upright or biphasic T wave that follows a slight downsloping ST segment that descends to the baseline. This distinctive pattern is considered a hallmark of the Brugada syndrome and is crucial for identifying patients at risk for life-threatening arrhythmias.

The upright or biphasic T wave signifies the abnormal repolarization characteristic of Brugada syndrome, setting it apart from other EKG changes that might present in different conditions. This morphology helps healthcare professionals make early diagnoses, which are essential for managing patients to prevent potential complications.

Other options provided do not reflect the distinctive ECG findings associated with the saddleback type of the Brugada pattern, thus highlighting why the upright or biphasic T wave is the most relevant factor.