How do you calculate the QRS interval on an ECG?

Related questions

1. What does it mean if you have an inverted T wave?
2. What is happening in the heart during the T wave?
3. What is wide QRS tachycardia?
4. Why is the P wave smaller than the QRS complex?
5. What is normal P value in ECG?
6. How do you measure QRS complex?
7. What is a normal P QRS T axis?

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