Table 1-Effects of N-CPAP Plus Oxygen on ABGs

in stable conditions.4 Acute effects of N-CPAP on arterial blood gas (ABG) values in a group of our patients with stable COPD are shown in Table 1. Finally, we agree together with de Lucas et all that the beneficial effect of N-CPAP in COPD is predominantly related to a better ventilation/perfusion relationship. In one 65-year-old patient with COPD, we performed a lung ventilatory scan (Fig 1) which clearly showed that N-CPAP significantly improves ventilation of the lung. We think that more studies are needed to examine the effects