What does a large box on an ECG measure?

Prepare for the West-MEC Medical Assisting Technical Skills Assessment with targeted study material. Test your knowledge with multiple choice questions and detailed explanations to ensure exam readiness.

Multiple Choice

What does a large box on an ECG measure?

Explanation:
A large box on the ECG grid is 5 mm across. The grid is built from small squares that are 1 mm each, so five of them form one large box. At the standard paper speed (25 mm/s), that 5 mm horizontally corresponds to 0.2 seconds of time.

A large box on the ECG grid is 5 mm across. The grid is built from small squares that are 1 mm each, so five of them form one large box. At the standard paper speed (25 mm/s), that 5 mm horizontally corresponds to 0.2 seconds of time.

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