LETTER TO THE EDITOR


https://doi.org/10.5005/jp-journals-10071-24524
Indian Journal of Critical Care Medicine
Volume 27 | Issue 11 | Year 2023

SOFA-based Prognostication in PICU: A Cardiovascular Critique!


Rohan Magoonhttp://orcid.org/0000-0003-4633-8851

Department of Anaesthesia, Atal Bihari Vajpayee Institute of Medical Sciences (ABVIMS) and Dr. Ram Manohar Lohia Hospital, New Delhi, India

Corresponding Author: Rohan Magoon, Department of Anaesthesia, Atal Bihari Vajpayee Institute of Medical Sciences (ABVIMS) and Dr. Ram Manohar Lohia Hospital, New Delhi, India, Phone: +91 9711128628, e-mail: rohanmagoon21@gmail.com

How to cite this article: Magoon R. SOFA-based Prognostication in PICU: A Cardiovascular Critique! Indian J Crit Care Med 2023;27(11):861–862.

Source of support: Nil

Conflict of interest: None

Keywords: Mortality, Pediatric intensive care unit, Prognosis, Sequential organ failure assessment score, Vasoactive agents, Vasoactive-inotropic score.

Dear Editor,

In the recent issue of the Indian Journal of Critical Care Medicine, Lois and Save serially evaluate the sequential organ failure assessment (SOFA) score for the prediction of mortality across the stages of pediatric intensive care unit (PICU) admission.1 Meanwhile, the index prospective observational study outlines the value of the initial, 72 hour and delta SOFA scores in the matter, a corresponding cardiovascular prognostic standpoint would be worth discussing here keeping abreast with the evolving developments in the subject.1

Sequential organ failure assessment score, albeit commonly used for assessing the severity of organ dysfunction, has been found to inadequately characterize cardiovascular failure in the modern-day ICU.2,3 Emanating from a post hoc analysis of two existing databases, Bachmann et al. delineate surprising results from a cohort of 1,031 adult patients admitted to the ICU.2 They suggest exercising caution in substituting the cardiovascular component of the SOFA score (cvSOFA) as numerical variables in the regression models. Their analysis reveals a peculiarly skewed distribution of cvSOFA scores, to raise concerns in expecting a linear association of the same with mortality.2 The research group simultaneously opines that the cvSOFA score may serve as a poor severity metric of the prevailing cardiovascular dysfunction owing to its’ insufficient representation of the current ICU practices pertaining to the administration of vasoactive agents.2,3

Specific to PICU, however, literature characteristically demonstrates poor outcomes in the backdrop of high hemodynamic support.4,5 Employing described formulas like vasoactive-inotropic score (VIS) for reporting cardiovascular support, Musick et al. highlight an escalating relative risk of mortality alongside an increasing VIS in PICU.4 Adding to the debate and propounding an update of the cvSOFA, Pölkki et al. recently discover an improved mortality predictive accuracy of the SOFA score on replacing the cvSOFA with maximum VIS or the VISmax, in a setting involving 8,079 ICU patients with a 30-day mortality rate of 13%.3 Ahead of the original SOFA score exhibiting a decent 30-day mortality-risk discrimination (area under the receiver operating characteristic curve or the AU-ROC of 0.813; 95% CI: 0.800–0.825), the predictive accuracy of the VISmax-based SOFA score was found to be accentuated (AU-ROC for SOFA-VISmax of 0.822; 95% CI: 0.809–0.834; difference when compared to the original SOFA score being 0.009; p < 0.001).3

Moreover, accounting for the dynamic nature of the disease course in critical care, it only appears appropriate for Lois and Save to have sought an incremental prognostic value of the delta SOFA in their prospective research endeavor.1 To that end, a retrospective cohort study by Shah et al. outlines the merit of estimating the aggregate VIS, computed using the hourly VIS area under the curve calculation premised on the trapezoidal rule.5 Amidst an elevated aggregate VIS being associated with in-hospital mortality and the need for continuous renal replacement therapy (CRRT) and extracorporeal membrane oxygenation (ECMO) (p < 0.0001, for all the parameters), classification and regression tree (CART) analysis revealed aggregate VIS >16 and >20 as respective independent predictors of ECMO use and in-hospital mortality (p < 0.0001).5 Indeed, the role of catering to outcomes like ECMO or CRRT in a prospective observational PICU-based study like the one by Lois and Save, can also not be overemphasized.1,5

ORCID

Rohan Magoon http://orcid.org/0000-0003-4633-8851

REFERENCES

1. Lois A, Save S. Serial evaluation of sequential organ failure assessment score (SOFA) as a predictor of outcome in children admitted in pediatric intensive care unit (PICU) at Tertiary Care Hospital. Indian J Crit Care Med 2023;27(8):588–593. DOI: 10.5005/jp-journals-10071-24509.

2. Bachmann KF, Arabi YM, Regli A, Starkopf J, Reintam Blaser A. Cardiovascular SOFA score may not reflect current practice. Intensive Care Med 2022;48(1):119–120. DOI: 10.1007/s00134-021-06536-6.

3. Pölkki A, Pekkarinen PT, Lahtinen P, Koponen T, Reinikainen M. Vasoactive inotropic score compared to the sequential organ failure assessment cardiovascular score in intensive care. Acta Anaesthesiol Scand 2023. Epub ahead of print. DOI: 10.1111/aas.14287.

4. Musick MA, Loftis LL, Kennedy CE. Comparing vasoactive-inotropic score reporting strategies in the PICU relative to mortality risk. Pediatr Crit Care Med 2018;19(12):1130–1136. DOI: 10.1097/PCC.0000000000001738.

5. Shah P, Petersen TL, Zhang L, Yan K, Thompson NE. Using aggregate vasoactive-inotrope scores to predict clinical outcomes in pediatric sepsis. Front Pediatr 2022;10:778378. DOI: 10.3389/fped.2022.778378.

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