Da"U= conclude that the situation is one of com- pensated respiratory alkalosis.Surely these patients have a ventilation-perfusion imbalance, with a shunting effect in the collapsed areas.Consequent hypoxaemia has led to hyperventilation in unaffected lung with resulting hypocapnoea and alkalosis.It is clear that is is unwise to make assumptions about acid/base status on the basis of bicarbonate values alone.Less than one third of the patients studied had pH values performed, and those were in the latter portion of the study when the stimulus to ective reappraisal of the initial preli.e canno w Ave been strong.If the lowered Bicarbonate is a compensatf;
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Barker et al. (1970) studied this question.