Objectives: Metabolic acidosis is commonly observed in critically ill patients. Experimental studies suggested that acidosis by itself could impair vascular function, but this has been poorly investigated in human. Design: Prospective observational study. Setting: Medical ICU in a tertiary teaching hospital. Patients: To assess the relationship between metabolic acidosis severity and microvascular reactivity, we included adult diabetic patients admitted in ICU for ketoacidosis. Microvascular response to acetylcholine iontophoresis was measured at admission (baseline) and after correction of metabolic acidosis (24 hr). Interventions: None. Measurements and Main Results: Thirty-nine patients with diabetic ketoacidosis were included (68% male), with a median age of 43 (31–57) years. At admission, microvascular reactivity negatively correlated with acidosis severity (R = –0.53; p 7.20; p
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