1. Contamination has gotten into the motor of an electric bed making a 500,000 connection between the hot wire and the bed's frame. An attendant has one hand on the bed frame and the other on a bare pacing lead that is attached to the patient's heart. The patient is connected to ground by the ground lead of an ECG monitor. The bed is powered by 110V. The resistances involved are as follows:

Hot lead to bed frame 500,000

Nurses skin resistance (Each hand, people have 2 hands) 40,000

Pacing lead resistance 50,000

Viscera Resistance 0.5

Patient skin resistance to the monitor ground lead 10,000

What leakage current flows into the patient's heart from this defect? What would be the likely physiologic effect to the patient?

2. Body fluids have gotten into a pressure monitor connected to a patient creating a 750,000 resistance between the hot lead and the patient lead, which is connectedto the patient's heart. The listing of resistances from the 110 volt hot lead to ground is as follows:

Hot to patient lead 750,000

Catheter resistance 20,000,000

Viscera resistance 25,000

Monitor ground electrode 0.5

What leakage current flows into the patient's heart from this situation? What would be the likely physiologic effect to the patient?