Figure 1.

Ambulatory acoustic cardiography monitor. This figure shows the placement of the acoustic cardiography recorder unit (5 × 7.6 × 1.9 cm, weight 43 g) and the ECG/sound sensors. Regular ECG monitoring electrodes are placed on the right arm, left arm, and left leg locations for ECG monitoring. Combined ECG/sound sensors are placed in the precordial V₃ and V₄ positions. The recorder unit is placed on either the patient's chest or abdomen. Abbreviations: ECG, electrocardiography; LA, left arm; LLA, modified left leg position; RA, right arm.