The Nature of PHAHD

The syndrome of PHAHD fully represents the biological general character of the pulmonary circulatory adaptation at high altitude.

Figure 4. Transverse section of a muscular pulmonary artery from a Han male infant aged 4 months with ISMS and severe pulmonary hypertension. There is a very thick muscular media sandwich between the internal and external elastic laminae (HEx 100) (After Li and Jiao, 1983).
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