ECG intervals (reference)
Typical adult rest intervals.
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How to use
ECG
Clinician interprets tracings.
Educational use only. Biology models are simplified; clinical and field decisions need appropriate expertise and measurement.
Typical adult rest intervals.
Clinician interprets tracings.
Educational use only. Biology models are simplified; clinical and field decisions need appropriate expertise and measurement.
Model / formula
ECG intervals (typical adult rest — ranges vary)
Reference
Rate: 60–100 bpm often quoted at rest. PR ~120–200 ms; QRS ~80–120 ms; QT varies with HR (use corrected QT in practice). **Diagnosis requires** a clinician and full clinical context.