[Marked polyglobulia in patients with obstructive sleep apnoea].

Two patients with obstructive sleep apnoea are presented. Both had marked hypoxaemic polycythaemia treated for many years with phlebotomies before a proper diagnosis was established. Diagnosis of obstructive sleep apnoea and introduction of CPAP treatment resulted in clinical improvement and regression of polycythaemia. In secondary polycythaemia differential diagnosis should include obstructive sleep apnoea.