CABT Healthcare and Electrical Safety 5

Question 1

An electrically susceptible patient (ESP) is one who has a direct conductive pathway to the heart. The ventricular fibrillation threshold for such a patient is approximately:

Accepted Answer

10–20 µA

Answer

Current as low as 10–20 µA applied directly to the myocardium can trigger ventricular fibrillation in electrically susceptible patients.

Question 2

The 'source leakage current' measured during medical device safety testing represents current flowing:

Accepted Answer

From the power source through the chassis to ground without any external patient load

Answer

Source leakage current (also called chassis or enclosure leakage) flows from the power-line conductors through insulation to the chassis and then to ground.

Question 3

Which organization publishes the Health Care Facilities Code that governs electrical safety requirements in US hospitals?

Accepted Answer

NFPA

Answer

NFPA 99, Health Care Facilities Code, published by the National Fire Protection Association, sets US electrical safety standards for healthcare environments.

Question 4

During preventive maintenance, a technician measures 0.15 Ω between two metal IV poles in the same patient room. Per NFPA 99, this finding indicates:

Accepted Answer

An unsafe condition exceeding the 0.1 Ω limit

Answer

NFPA 99 requires that resistance between any two exposed conductive surfaces in a patient care vicinity not exceed 0.1 Ω; 0.15 Ω exceeds this limit.

Question 5

Which type of power outlet is required by NFPA 99 to be supplied by the emergency essential electrical system in an operating room?

Accepted Answer

Red-colored receptacles connected to the critical branch

Answer

Red receptacles in ORs are connected to the critical branch of the essential electrical system, ensuring power during a utility failure.

(CABT) Certified Associate in Biomedical Technology Practice Test

(CABT) Certified Associate in Biomedical Technology Practice Test

CABT Healthcare and Electrical Safety 5