A man who visited Mount Everest Base Camp to install a defibrillator as part of his advocacy work has revealed the device saved a woman’s life just three weeks after he left Nepal.

David Sullivan is the founder of Code Blue CPR , an organization that trains defibrillator use and CPR skills at home and around the world.

Earlier this year, the 62-year-old from Surrey ventured to the Himalayas where he installed what he says is the world’s highest defibrillator. Climbers die on Everest all the time—not always of cardiac arrest—but certainly sometimes, and the use of a defibrillator within the first 3 minutes of a heart attack can improve survival rates from 8% to over 50%.

Climbing to an altitude of 22,000 feet to test the defibrillator, Sullivan then descended to one of the villages nea

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