Regarding patients suffering from pre-existing chronic diseases, Figure 1 proposes a non-exhaustive list of important comorbidities needing a particular look before departure.
General recommendations for people with comorbidities are listed in the table on the next page.
REF: David Eidenbenz, 2017. BJSM. Mountain sports: what should a sports doctor check before authorizing patients to go at high altitudes? https://blogs.bmj.com/bjsm/2017/06/03/mountain-sports-sports-doctor-check-authorizing- patients-go-high-altitudes/