ECG interpretation involves systematically analyzing the waveforms and intervals to assess heart rhythm, rate, and overall electrical activity. This includes evaluating the P-wave (atrial depolarization), PR interval, QRS complex (ventricular depolarization), ST segment, T-wave (ventricular repolarization), and QT interval. A normal ECG typically shows a regular heart rate (60-100 bpm), normal P-waves, a PR interval between 120-200 ms, a QRS complex duration less than 120 ms, and a normal QT int

Need to quickly calculate heart rate on an ECG? ~ Try the Big Box Method! Here's how it works: Count the number of big boxes between two consecutive R waves. Divide 300 by that number to estimate the heart rate in beats per minute (bpm)! 1 big box = 300 bpm 2 big boxes = 150 bpm 3 big boxes = 100 bpm 4 big boxes = 75 bpm 5 big boxes =60 bpm 6 big boxes = 50 bpm A Note: This method works for regular rhythms only! Use this method to spot tachycardia, bradycardia, or a normal heart rate in seconds!