• Clinics · Jan 2022

    Methylene Blue to Neonatal Septic Shock treatment in neonate pigs.

    • Walusa Assad Gonçalves-Ferri, AlbuquerqueAgnes Afrodite SumarelliAASFaculdade de Medicina de Ribeirão Preto (FMRP), Universidade de São Paulo, Ribeirão Preto, SP, Brazil., Renata Sayuri Ansai Pereira de Castro, Cristina Helena Faleiros Ferreira, Luis K Oharomari, Diego Fernando Silva Lessa, and EvoraPaulo Roberto BarbosaPRBFaculdade de Medicina de Ribeirão Preto (FMRP), Universidade de São Paulo, Ribeirão Preto, SP, Brazil. Electronic address: prbevora@gmail.com..
    • Faculdade de Medicina de Ribeirão Preto (FMRP), Universidade de São Paulo, Ribeirão Preto, SP, Brazil. Electronic address: walusa@fmrp.usp.br.
    • Clinics (Sao Paulo). 2022 Jan 1; 77: 100139100139.

    ObjectiveThe authors design an animal model of neonatal sepsis to analyze the treatment of neonatal septic shock with Methylene Blue (MB) in a swine model.MethodsThe study design included twenty male newborn pigs divided into four groups: 1) The control group; 2) The sepsis group (induced with lipopolysaccharide); 3) The MB group, and 4) The MB-treated sepsis group. Septic shock was defined as Blood Pressure (BP) dropping 20% below the baseline value. Continuous Blood Pressure (BP), Nitric Oxide (NO) levels, cyclic Guanosine Monophosphate (cGMP), malondialdehyde acid, base excess, lactate, arterial blood gases, hematocrit, and echocardiography were analyzed.ResultsThe BP of the sepsis group treated with MB showed a slight improvement in the first hour after treatment; however, a significant difference was not observed compared to the untreated sepsis group. Besides hemodynamic stability, the current study did not show symptomatic pulmonary hypertension, suggesting that MB was safe in neonates and children. An improvement in Base Excel (BE) levels after MB administration in septic animals may indicate a possible improvement in microcirculation.ConclusionThe MB improved biomarkers related to septic shock prognosis, although an improvement in the blood levels could not be detected. MB might be a beneficial drug for hemodynamic instability in infants.Copyright © 2022 HCFMUSP. Published by Elsevier España, S.L.U. All rights reserved.

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