Kufema kwenguva refu kweokisijeni kunogona kubvisa pulmonary hypertension inokonzerwa ne hypoxia, kuderedza polycythemia, kuderedza viscosity yeropa, kuderedza mutoro we ventricle yakarurama, uye kuderedza kuitika uye kukura kwechirwere chemwoyo chemapapu. Kuvandudza kupihwa kweokisijeni kune ...