Hypoxaemia occurs with sloop apnoea and might induce nocturnal angina.
Sleep apnoea was found in 9 of 10 patients with nocturnal angina pect
oris. Nocturnal angina diminished during treatment of sleep apnoea by
continuous positive airway-pressure, and the number of nocturnal myoca
rdial ischaemic events measured by computerised vector-cardiography wa
s reduced.