• I Jousela.
• Department of Anaesthesia, Helsinki University Central Hospital, Finland.
• Acta Anaesthesiol Scand. 1993 May 1;37(4):381-5.

AbstractVarious ways of delivering continuous positive airway pressure (CPAP) have been extensively studied, with little attention, however, being paid to the effects of an intubation tube compared with breathing through a face mask, with or without CPAP. Pulmonary and cardiovascular variables were measured while 12 patients recovering from coronary artery bypass grafting were spontaneously breathing at ambient airway pressure, then at 7.4 mmHg (1 kPa) CPAP, and again at ambient pressure just before extubation. The same stages were repeated immediately after extubation, with patients breathing through a tight-fitting face mask. Arterial oxygen tension (Pao2, mean +/- s.d.) was better when the patients were breathing at ambient pressure through a face mask (11.7 +/- 2.8 kPa) than when they were intubated (10.6 +/- 2.4 kPa, P < 0.05). Compared with ambient pressure, CPAP (7.4 mmHg) (1 kPa) increased Pao2 in both modes (13.4 +/- 3.5 kPa with mask, and 12.6 +/- 3.5 kPa when intubated, n.s.). The best arterial oxygen saturation was measured during CPAP with a face mask (96 +/- 1%). Cardiac output remained unchanged in all the breathing modes. After coronary artery bypass grafting, spontaneous breathing with a face mask resulted in better Pao2 than breathing through an endotracheal tube, both with and without 7.4 mmHg (1 kPa) CPAP. This study indicates that unnecessary delay in extubation should be avoided.

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