Background
Infants recovering from congenital heart surgery risk complications such as low cardiac output syndrome (LCOS) and acute kidney injury (AKI). Although clinicians use the vasoactive–inotropic score (VIS) to assess cardiovascular support, relying only on the peak value (VIS-max) may overlook meaningful changes in vasoactive requirements during early recovery.
Objective
This study evaluated whether early VIS kinetics—captured through the area under the curve (VIS-AUC₀–₁₂h) and the rate of change (VIS-slope₀–₁₂h)—offer better prediction of LCOS and AKI compared with VIS-max.
Methods
We retrospectively reviewed 320 infants under 24 months undergoing congenital heart surgery with cardiopulmonary bypass. Vasoactive doses from the first 12 postoperative hours were used to calculate VIS-max, VIS-AUC, and VIS-slope. LCOS and AKI were defined using standardized criteria. Predictive performance was evaluated with multivariable logistic regression and cross-validated AUCs.
Results
Among 320 infants, 31.6% developed LCOS and 10.3% developed AKI. Infants with LCOS showed higher VIS-max, greater VIS-AUC₀–₁₂h, and steeper VIS-slope trajectories than those without LCOS. VIS kinetics provided modest but consistent improvement in LCOS prediction over VIS-max (AUC 0.760 vs 0.746), and decision-curve analysis indicated additional net clinical benefit. In contrast, VIS metrics showed limited discrimination for AKI.
Conclusions
Monitoring VIS trends during early postoperative hours offers a broader assessment of circulatory stress than relying solely on VIS-max. Early VIS kinetics may help identify infants at higher risk of LCOS and support closer hemodynamic surveillance, while their limited value for AKI suggests a need for additional renal risk markers.
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