alexa Copeptin as a marker of relative arginine vasopressin deficiency after pediatric cardiac surgery.
Cardiology

Cardiology

Journal of Clinical & Experimental Cardiology

Author(s): Mastropietro CW, Mahan M, Valentine KM, Clark JA, Hines PC,

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Abstract PURPOSE: Relative arginine vasopressin (AVP) deficiency after pediatric cardiac surgery has recently been described. Copeptin, a more stable and easily measured product of pro-AVP processing, may be a means of identifying these patients. We aimed to determine if copeptin was correlated with AVP in these children and whether it can be a surrogate marker of relative AVP deficiency. METHODS: Patients <6 years of age with basic Aristotle scores ≥7 requiring surgery with cardiopulmonary bypass were prospectively enrolled. Plasma AVP and copeptin concentrations were measured pre-cardiopulmonary bypass and 4 and 24 h post-cardiopulmonary bypass. Relative AVP deficiency was defined a priori based on our previous work as AVP <9.2 pg/ml at 4 h post-cardiopulmonary bypass. RESULTS: Of 41 children enrolled, relative AVP deficiency was present in 13 (32 \%). AVP and copeptin concentrations were significantly lower in these 13 children at 4 h post-cardiopulmonary bypass as compared to the other 28 patients. A significant positive association between plasma AVP and copeptin concentrations over time was determined. Based on log-transformed analyses, a 1 \% increase in plasma AVP led to a 0.19 \% increase in copeptin. Further, copeptin <1.12 ng/ml at 4 h post-cardiopulmonary bypass had a sensitivity of 92 \% and a negative predictive value of 95 \% for relative AVP deficiency. CONCLUSIONS: Plasma AVP and copeptin are positively associated in children undergoing cardiac surgery. Copeptin may represent a useful means of identifying relative AVP deficiency in these patients. This article was published in Intensive Care Med and referenced in Journal of Clinical & Experimental Cardiology

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