Methylene Blue to Neonatal Septic Shock treatment in neonate pigs,

Author(s)

Walusa Assad Gonçalves-Ferri ^[1] ; Agnes Afrodite Sumarelli Albuquerque ^[2] ; Renata Sayuri Ansai Pereira de Castro ^[3] ; Cristina Helena Faleiros Ferreira ^[4] ; Luis K. Oharomari Jr. ^[5] ; Diego Fernando Silva Lessa ^[6] ; Paulo Roberto Barbosa Evora ^[7]

Affiliation

^[1] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto - Brasil

^[2] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto - Brasil

^[3] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto - Brasil

^[4] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto - Brasil

^[5] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto - Brasil

^[6] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto - Brasil

^[7] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto - Brasil

• Document type: Journal article
• Source: Clinics; v. 77, 2023-01-09.

Abstract

Abstract Objective The authors design an animal model of neonatal sepsis to analyze the treatment of neonatal septic shock with Methylene Blue (MB) in a swine model. Methods The 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. Results The 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. Conclusion The 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. (AU)

• FAPESP's process: 17/03124-3 - Inhibition of the cGMP/NO in the circulatory shock caused by vasoplegic endothelial dysfunction
• Grantee: Paulo Roberto Barbosa Evora
• Support Opportunities: Regular Research Grants