Ace the CBET Challenge 2025 – Master Biomedical Equipment with Style!

When only lead 1 on a telemetry transmitter displays properly, the most likely cause is a defect in the LA (left arm) lead wire. The telemetry system relies on inputs from various lead wires to obtain a complete picture of the heart's electrical activity. Lead 1 specifically captures the electrical potentials between the left arm and the right arm. If the LA lead wire is malfunctioning or defective, it can result in data being received only from that particular lead, leading to the display anomaly observed.

In scenarios with defective lead wires, the issue can often stem from poor connections, breakages, or internal defects in the wire itself. If the LA lead wire is the one not transmitting properly, then only the signal from lead 1 would be effectively captured and displayed.

Other options suggest issues with alternative lead wires or the battery but do not align with the symptom of only lead 1 being functional. For instance, a defective LL (left leg) or V (precordial) lead wire would typically affect other leads, while a low battery usually results in a complete failure or intermittent operation across multiple leads, rather than just one. Thus, focusing on the performance of lead 1 in isolation strongly indicates an issue with the LA lead wire as the most