Despite adequate monitoring of ventilatory parameters and prophylactic treat ment with alkali, severe acidosis and hypercapnia may develop during the ischemic and reperfusion phase of the operation of the thoracic aorta when cross-clamping is used. The authors present a case wherein the use of sodium bicarbonate made possible the development of transient paradoxical acidosis and severe hypercap nia. Their report is focused on initial presentation and management.
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