Intervals: PR, QRS, QT Measurement — ECG Academy Lesson

Master the three critical EKG intervals — PR, QRS, and QT — their normal ranges, how to measure them accurately, and what abnormal values mean clinically.

Learning Objectives

• Define the PR interval and measure it accurately using the EKG grid
• Identify normal, short, and prolonged PR intervals and their clinical significance
• Measure QRS duration and classify it as normal, borderline, or wide
• Define the QT interval and explain why it varies with heart rate
• Recognize prolonged QT interval as a risk factor for Torsades de Pointes