As a medical professional with expertise in cardiology, I can provide you with the general understanding of the normal range for an Electrocardiogram (ECG). The ECG is a diagnostic tool that measures the electrical activity of the heart, and it's essential for diagnosing various heart conditions. Here are the normal values for the different components of an ECG: - RR interval: This is the time between two successive R-waves (peaks of the QRS complex) and is typically between 0.6 to 1.2 seconds in adults at rest. It reflects the heart rate, with a normal resting heart rate being 60 to 100 beats per minute (bpm). - P wave: The P wave represents atrial depolarization and should last no more than 120 milliseconds. - PR interval: This is the time from the beginning of the P wave to the beginning of the QRS complex and should be between 120 to 200 milliseconds. It represents the time for electrical impulses to travel from the atria to the ventricles. - PR segment: This is the isoelectric segment between the P wave and the PR interval, and it's typically between 50 to 120 milliseconds. - QRS complex: This complex represents ventricular depolarization and should last between 80 to 100 milliseconds. - J-point: The J-point is the junction between the QRS complex and the ST segment. It's not typically measured in milliseconds as part of the normal ECG values. - ST segment: The ST segment represents the time between the end of the QRS complex and the beginning of the T wave. It should be relatively flat and isoselectric, with any deviation potentially indicating ischemia or other conditions. The duration is not typically measured in milliseconds for normal values. - T wave: The T wave represents ventricular repolarization and should last no more than 160 milliseconds. Please note that these values can vary based on age, heart rate, and other factors. It's important to interpret ECG results in the context of the patient's clinical presentation and other diagnostic information. read more >>

Normal values for waves and intervals are as follows:RR interval: 0.6-1.2 seconds.P wave: 80 milliseconds.PR interval: 120-200 milliseconds.PR segment: 50-120 milliseconds.QRS complex: 80-100 milliseconds.J-point: N/A.ST segment: 80-120 milliseconds.T wave: 160 milliseconds.More items...read more >>