“…The diaphragm, that is the main inspiratory muscle, is spared in lesions below C5 but at this level all expiratory muscles are paralysed. This has very deleterious effects on the ventilatory function of the lungs, especially in the early stages when the mortality rate, due to respiratory problems, is very high, ranging from 7'4 to 40 per cent (Durbin, 1957;Norton, 1962;Tribe, 1963;Cheshire, 1964;Cheshire & Coats, 1966;Guttmann & Frankel, 1966;Silver & Gibbon, 1968;Bellamy et at., 1973).…”