One of the helicopter myths (enforced by some air anbulances) is never to use a defibrilator onboard. That's an urban legend
and nonsense. The circuit is completed by the quick-look paddles and the pilots nor the instruments won't be affected. The trick to not getting airsick in a helicopter or fixed wing aircraft is to keep your head looking straight ahead in ANY turn or BANK. In a light fixed wing there are two such turns coming into the pattern, or 90 degrees.