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GP develops an altitude sickness aid

Keen climber Dr Nigel Hart is developing a method of spotting the early symptoms of altitude sickness.

The device uses angina spray GTN to predict whether climbers are more prone to suffering

a cerebral oedema as

they ascend to greater heights.

On a recent trip to Nepal, 60 researchers were asked to take GTN, which causes the brain temporarily to swell, and rate the severity of their headache afterwards.

'The aim of the test is to give tomorrow's symptoms today,' said

Dr Hart, a GP in Belfast.

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