Final answer:
The use of a Portable Dialysis Machine (PDM) during flight requires obtaining airline approval due to varying policies and the need to ensure safety and feasibility.
Step-by-step explanation:
The use of a Portable Dialysis Machine (PDM) during flight is subject to specific regulations. The correct answer to whether a PDM can be used during flight is c) Only with airline approval. Airlines have different policies regarding the use of medical devices on board their aircraft, and it is crucial for passengers to contact the airline in advance to ensure that their PDM is allowed.
The airline will consider factors such as available space, power supply, and the ability to meet safety regulations. In some cases, additional arrangements and formalities may be required to accommodate the use of a PDM during the flight.