As a medical professional with expertise in cardiology, I can provide you with information on the normal range for an ECG, which stands for electrocardiogram. An ECG is a test that measures and records the electrical activity of the heart, providing a snapshot of the heart's function at a given moment.
Normal ECG Ranges:
1.
Heart Rate (HR): The normal range for a resting adult heart rate is typically between
60 - 100 beats per minute (bpm). However, it's not uncommon for athletes and individuals with very good physical fitness to have a lower resting heart rate, sometimes as low as 40 bpm.
2.
Rhythm: The ECG should show a regular sinus rhythm, which means that the heart's electrical activity is initiated by the sinoatrial (SA) node, the heart's natural pacemaker.
3.
P Wave: The P wave represents atrial depolarization and should be upright in leads I, II, and V4-V6, and usually less than 120 milliseconds in duration.
4.
PR Interval: This is the time from the beginning of the P wave to the beginning of the QRS complex. A normal PR interval is
0.12 - 0.20 seconds.
5.
QRS Duration: The QRS complex represents ventricular depolarization and should be less than
120 milliseconds in duration.
6.
QT Interval: The QT interval reflects the time from the start of the QRS complex to the end of the T wave, which represents ventricular repolarization. The normal QT interval varies based on heart rate and gender, but a rough guideline is that it should be less than
440 milliseconds for males and
460 milliseconds for females.
7.
Axis: The mean electrical axis of the heart's electrical activity should be between
0 and +90 degrees for the QRS complex in lead I.
8.
ST Segment: The ST segment should be isoelectric (flat) and not elevated or depressed more than
1 mm.
9.
T Wave: The T wave represents ventricular repolarization and should be upright in leads I, II, and V4-V6.
Please note: ECG interpretation can be complex and requires medical expertise. The normal values provided here are general guidelines and may vary based on individual factors and specific ECG machine settings.
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