Respiratory Therapist

Answers: A, B, and D - An inline galvanic fuel cell placed inline a ventilator circuit can be affected by excess water on the cell membrane, altitude, or excessive pressure settings.

Excess water in the circuits can cause excess water on the cell membrane, which will affect accuracy by interfering with the oxygen diffusing, and a low reading will occur. Altitude can also affect the galvanic fuel cell as it is affected by barometric pressure. Excessive pressure will cause the device to have a higher than accurate reading.