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The initial phase and the development of myocardial focal necroses were studied in 50 rats adapted successively to intermittent high altitude. The altitude hypoxia was produced in a low pressure chamber (7000 m, five days a week, four hours daily). First-minute myocardial changes detected by histochemical methods were found after 4 exposures at a level of 3000 m and distinct ones after 8 exposures at a level of 4500 m. Histologically, acute focal necroses were found after 11 exposures at a level of 6000 m. Hypoxia and stress are suggested to account for these myocardial focal changes. During further adaptation no further acute focal necroses were observed.
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