S04 ECG 2

ECG 2 explains Einthoven’s triangle. Students record Leads I and III while performing a number of tasks designed to change the rhythm of the heart. They then analyze the data and estimate the mean QRS axis and potential.

• National Science Education Standards Correlation

Experimental Objectives

1. To record ECG from Leads I and III in the following conditions: lying down, sitting up, and breathing deeply while sitting.
2. To compare the direction of the QRS complex (+ or -) with the direction of the lead axis.
3. To estimate the mean ventricular potential.
4. To estimate the mean electrical axis of the QRS complex.

Tasks Performed by the Student

• Record ECG using bipolar Leads I and III.
• Lie down and relax.
• Sit and relax.
• Breathe in and out once in each position.

Student Prep & Distance Learning

Click the link(s) below for sample data and/or lesson procedure video(s), BSL PRO Lesson procedures (PDF) for human lessons*, and graph template files (*.gtl) for BSL PRO Lessons. If more than one .gtl is available, download the .gtl with the _suffix to match BSL version and hardware.

• Biopac Science Lab Lesson S04 (review copy)