Acute mountain sickness (11234058)

Acute mountain sickness (AMS) is the set of symptoms that can develop when a climber gains altitude too quickly for the body to adjust to diminishing oxygen. During the 1996 Mountain Madness expedition, it was both a medical risk and a test of the expedition’s plans: symptoms appeared after a sudden change of itinerary, prompted rest and treatment, and raised doubts about whether some clients could safely attempt the summit. The account repeatedly distinguishes reaching higher ground from becoming fit to remain there.

Definition and Medical Risks

The book describes AMS as illness brought on by going too high too fast, particularly through large elevation gains before the body has adjusted to lower oxygen availability. Its moderate symptoms include headache, nausea, disturbed sleep, fatigue, shortness of breath, malaise, dizziness, and loss of appetite. The condition can progress to high-altitude cerebral edema or high-altitude pulmonary edema, two more serious and potentially deadly manifestations. The distinction matters: ordinary early symptoms may linger for a day or two during acclimatization, but persistence can signal a more serious problem.

Diamox, a sulfa-drug derivative used by climbers for more than twenty years, can help the body metabolize oxygen and is recommended as a preventive by some high-altitude physicians. But medication does not make rapid ascent safe. The manufacturer’s warning, quoted in the account, says gradual ascent is desirable and that Diamox does not remove the need for prompt descent if severe altitude sickness occurs. The drug therefore appears as a supporting measure, not a replacement for acclimatization or a reason to ignore worsening symptoms.

The Itinerary and Its Reversal

The Mountain Madness clients arriving from the United States were originally scheduled to leave Los Angeles on March 23, spend time in Kathmandu, and fly to Lukla at 2,850 meters on March 28. That conservative itinerary was designed to reduce the risk of AMS. Starting below 3,040 meters and walking upward slowly followed a widely recommended acclimatization maxim, reflected in popular Himalayan trekking and climbing guides.

Shortly before the expedition began, Scott Fischer changed the plan: instead of taking the clients by helicopter to Lukla, he arranged to fly them with expedition gear to Syangboche on March 29. The same village had been reached four days earlier by Anatoli Boukreev and Ngima Sherpa without difficulty, but the clients experienced the substantial altitude jump almost immediately. Sandy Hill Pittman reported that nearly everyone was short of breath simply walking around, while two people were in bed with upset stomachs. One was Lene Gammelgaard. A route change made before the trek had properly begun thus turned a preventive itinerary into an early health problem.

Symptoms, Treatment, and Observation

From Syangboche, the team trekked to Namche Bazaar, where it spent two days resting and taking short hikes in an effort to acclimatize. Some members’ symptoms continued. Although symptoms during the first day or two at altitude were described as normal, their persistence was treated as a reason for concern rather than proof that the body had successfully adjusted. Many team members took Diamox, but the account’s discussion of the drug emphasizes that it could not eliminate the need to descend if serious illness developed.

The expedition’s medical concern was not limited to the approach trek. At Base Camp, climbers closely monitored bodily functions and worried that nausea, headaches, gastrointestinal trouble, or respiratory illness could prevent them from continuing. Tim Madsen developed acute symptoms and descended to Pheriche with expedition doctor Ingrid Hunt; Hunt was also experiencing altitude problems. The decision to go lower made the general principle concrete: a climber’s presence on the expedition did not make continuing upward the appropriate response to illness.

Hunt used a pulse oximeter to measure the maximum amount of oxygen carried in the blood under the conditions at altitude. The results varied sharply among the people tested: Boukreev and Fischer scored in the low 90s, while Hunt scored in the mid-70s and a client of particular concern scored in the 60s, which Hunt considered low even for that elevation. Boukreev questioned how much the readings alone could tell him, preferring to assess clients’ outward condition. Despite that difference in emphasis, he and Hunt shared the concern that some clients might be at high risk if they attempted a summit bid. The episode places measurement beside observation, without suggesting that either could make the danger disappear.

Acclimatization as an Expedition Plan

At Base Camp, Boukreev established a staged acclimatization routine intended to let the team adjust through successive excursions to higher camps. The plan called for four excursions and treated rest as part of the process, not as time lost from climbing. On the first excursion, clients would reach the 6,100-meter site of Camp I but return to Base Camp the same day. They would carry only personal belongings and equipment, preserving strength, while the climbing Sherpas under Lopsang Jangbu Sherpa carried ropes and supplies. Afterward, the team would rest so members could recover and guides could observe their condition.

The second excursion was to include an overnight at Camp I, followed by a training climb to 6,500 meters, where the Sherpas were establishing Camp II as an advance base camp. The clients were not to spend the night at that higher elevation on this outing; they would descend and take a multiday rest. Later, the planned mandatory excursion to Camp III was intended to include a night at altitude and, if clients felt able, a further gain of 200 to 300 meters before descending. Boukreev argued that acclimatization also required conserving energy: repeated climbs depleted strength that even a long rest at Base Camp would not fully restore. His concern was that some clients understood the routine chiefly as a sequence of elevation gains, rather than as a balance of ascent, recovery, and assessment.

That balance had consequences for the expedition’s work. When Camp III was not yet established and the Sherpas were nearing exhaustion, Mountain Madness had agreed with other expeditions to help fix ropes between Camps III and IV on April 26. Sending its Sherpas to establish Camp III and then rest would leave none available for the joint rope-fixing effort, so Boukreev was sent in their place. Mountain Madness did not want to lose its position among the early summit bidders, with May 10 already circulating as a possible date. This episode shows how the time needed for acclimatization and Sherpa recovery competed with the logistical pressure to prepare the route and preserve a summit opportunity.

Summit-Day Limits and Significance

By the night before the May 10 summit bid, the expedition’s oxygen reserve left little room for delay. At Camp IV, the team had 62 canisters: nine heavier Zvesda canisters reserved for sleeping and 53 Poisk canisters set aside for the climb. Five of the six climbing Sherpas planned to use oxygen, while Lopsang Jangbu Sherpa climbed without it but carried one canister for emergencies. The Sherpas took 21 bottles uphill; the six clients, Fischer, and Neal Beidleman carried 17 between them, while Boukreev carried one. After 38 Poisk canisters went up, only 15 full ones remained at Camp IV, along with whatever oxygen was left from the Zvesda bottles. The available margin was not enough to support an overnight delay and a second summit attempt on May 11.

Before the expedition, Fischer and Boukreev had agreed that Boukreev would guide without oxygen if he was properly conditioned and acclimatized. Fischer planned three canisters—18 hours of oxygen—for each client, with departure at midnight, a return to Camp IV by 6:00 p.m., and Boukreev available to bring oxygen, hot drinks, or physical assistance if climbers were late. The plan linked acclimatization and oxygen to a firm practical limit: clients needed enough reserve to climb and return before their supplies ran out. On summit day, however, the expected early rope-fixing by the Sherpas had not happened, and the clients’ ascent involved waiting rather than uninterrupted progress. AMS was one part of a larger high-altitude danger, but it belonged to the same chain of vulnerability: the body had to adjust, energy had to be preserved, equipment and communication had to work, and a summit plan had to leave room for descent. The account’s central warning is therefore not that every symptom foretold disaster, but that altitude illness could not be separated from the decisions and constraints governing whether climbers continued upward or turned back.