Last October, my daughter Elizabeth and I stood at Londorossi gate (elevation 2,250 metres), the western entrance to Mount Kilimanjaro National Park in Tanzania, ready to begin the nine-day Lemosho route up Mount Kilimanjaro. Climbing “Kili” would fulfil a dream I’ve had since working as a medical student in Kenya. Elizabeth’s dream was to ensure her dad came back in one piece.
Unlike Mount Everest, Kilimanjaro is a hike, not a technical climb requiring ropes or crampons. However, as a cardiologist and researcher in oxygen sensing, I knew that our key challenge would be the lack of oxygen — a condition called hypoxia.
Altitude and oxygen
Hypoxia occurs at altitude. At sea level, gravity creates barometric pressure, which compresses nitrogen and oxygen, accounting for Earth’s oxygen-rich…