CBET - Certified Biomedical Equipment Technician Healthcare Technology Problem-Solving Questions and Answers 1 — Questions and Answers
Question 1: A nurse reports an infusion pump is alarming for "Downstream Occlusion." The BMET visually inspects the IV tubing from the pump to the patient and finds no visible kinks or clamps. What is the MOST appropriate next step in troubleshooting?
- Reboot the infusion pump to reset the software.
- Disconnect the tubing from the patient and attempt to run a small volume of fluid into a container. (Correct answer)
- Immediately replace the pump's internal pressure sensor.
- Instruct the nurse to increase the infusion rate to try and clear the line.
Correct answer: Disconnect the tubing from the patient and attempt to run a small volume of fluid into a container.
This step effectively isolates the problem. If the pump can infuse into a container without alarming, the issue is likely with the patient's IV catheter or access site (e.g., a clot or positional infiltration). If it still alarms, the problem is with the pump or the disposable tubing set. This is a critical and non-invasive troubleshooting step that differentiates a device problem from a clinical one.
Question 2: During a surgical procedure, the surgeon reports poor cutting performance from the electrosurgical unit (ESU), and the ECG monitor simultaneously displays significant noise and artifact. Which of the following is the MOST likely root cause for both issues?
- The ESU's power cord is frayed.
- The ECG monitor's filter settings are incorrect.
- A poor or dried-out patient return electrode (grounding pad) connection. (Correct answer)
- The ambient humidity in the operating room is too low.
Correct answer: A poor or dried-out patient return electrode (grounding pad) connection.
The patient return electrode provides a low-impedance path for the high-frequency ESU current to return to the generator. A poor connection increases this impedance, which reduces the ESU's cutting effectiveness and can cause the current to seek alternative paths, often through ECG leads, creating significant artifact.
Question 3: To verify that a defibrillator is delivering the correct amount of energy and that its waveform characteristics are within specifications, a BMET must use which specialized piece of test equipment?
- A digital multimeter with a peak-hold function.
- An electrical safety analyzer.
- An oscilloscope with a high-voltage probe.
- A defibrillator/pacer analyzer. (Correct answer)
Correct answer: A defibrillator/pacer analyzer.
A defibrillator/pacer analyzer is a specialized instrument that presents a specific resistive load (typically 50 ohms) to the defibrillator and precisely measures the delivered energy in Joules. It is also designed to analyze key waveform parameters like pulse duration and current, which cannot be done with the other listed devices.
Question 4: A BMET is tasked with troubleshooting an intermittent "No Signal" error on a single patient monitor connected to a large central monitoring network. The problem occurs randomly. Which of the following represents the MOST effective initial troubleshooting approach?
- Systematically swap components one at a time with known good ones, starting with the easiest to replace. (Correct answer)
- Re-terminate the network connections at the wall plate and the back of the monitor.
- Immediately replace the patient monitor with a new one.
- Request the hospital's IT department to reboot the central network switch for that floor.
Correct answer: Systematically swap components one at a time with known good ones, starting with the easiest to replace.
For intermittent problems, systematically swapping components is a highly effective troubleshooting technique. Starting with the simplest and most common failure points, such as the network patch cable, then the monitor itself, allows the technician to isolate the faulty element without making assumptions or performing unnecessarily disruptive actions like rebooting a network switch.
Question 5: An anesthesia machine is failing its automatic low-pressure leak test. The technician has already replaced the entire external breathing circuit with a known good set, but the failure persists. Which of the following is the MOST likely internal component to investigate next for a leak?
- The oxygen flowmeter.
- The CO2 absorber canister and its seals. (Correct answer)
- The main power supply board.
- The vaporizer interlock mechanism.
Correct answer: The CO2 absorber canister and its seals.
The CO2 absorber canister is a critical part of the low-pressure breathing circuit. Its seals can easily become compromised when the canister is changed or if it is cracked, making it one of the most common sources of leaks within the machine after the external circuit has been ruled out.
Question 6: A surgeon reports that a surgical laser is not cutting tissue effectively, despite the power being set correctly on the console. The BMET confirms the laser is generating the correct power at its output port using an external power meter. What is the MOST probable cause for the low power delivery at the surgical site?
- A faulty footswitch.
- Incorrect room temperature.
- A damaged or dirty distal tip of the laser fiber. (Correct answer)
- A software calibration error in the main console.
Correct answer: A damaged or dirty distal tip of the laser fiber.
The BMET has already verified that the laser itself is working correctly, which isolates the problem to the delivery system. The distal (patient-end) tip of the laser fiber is fragile and subject to damage or contamination. A fractured, dirty, or poorly cleaved fiber tip will cause the laser energy to scatter and diffuse instead of being focused, resulting in a dramatic loss of power density at the tissue.
CBET - Certified Biomedical Equipment Technician Healthcare Technology Problem-Solving Questions and Answers 1
A nurse reports an infusion pump is alarming for "Downstream Occlusion." The BMET visually inspects the IV tubing from the pump to the patient and finds no visible kinks or clamps.
What is the MOST appropriate next step in troubleshooting?