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Short-term effects of methylene blue on hemodynamics and gas exchange in humans with septic shock

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Abstract

Objective

The aim of this study was to investigate the acute effects of methylene blue (MB), an inhibitor of thel-arginine nitric oxide pathway, in patients with septic shock.

Design

A prospective, open, single-dose study.

Setting

The medical ICU of a university hospital.

Patients

Six patients with severe septic shock.

Interventions

Complete hemodynamic values were recorded before and 20 min after the infusion of intravenous MB (3 mg kg−1). Arterial pressure was then monitored during the next 24 h or until death.

Measurements and results

Methylene blue increased the mean arterial pressure from 69.7±4.5 to 83.7±5.1 mmHg (p=0.028) and the mean pulmonary artery pressure, from 34.3±7.2 to 38.7±8.0 mmHg (p=0.023). Systemic vascular resistance index was increased from 703.1±120.6 to 903.7±152.2 dyne.s.cm−5.m−2 (p=0.028) and pulmonary vascular resistance index, from 254.6±96.9 to 342.2±118.9 dyne.s.cm−5.m−2 (p=0.027). The PaO2/FIO2 decreased from 229.2±54.4 to 162.2±44.1 mmHg (p=0.028), without significant modification of intrapulmonary shunting. Heart rate, cardiac index, right atrial pressure, DO2, VO2, oxygen extraction and arterial lactate were essentially unchanged. Sequential measurements of arterial pressure demonstrated a return to baseline level in 2–3 h. All but one patients died, three in shock and two in multiple organ failure.

Conclusions

MB induces systemic and pulmonary vasoconstriction in patients with septic shock, without significant decrease in cardiac index. The worsening of arterial oxygenation following MB injection may limit its use in patients with the adult respiratory distress syndrome. Larger studies are required to determine whether MB improves the outcome of patients with septic shock.

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Authors and Affiliations

  1. Clinique de Réanimation des Maladies Infectieuses, Hôpital Bichat-Claude, Bernard, 46, rue Henri Huchard, F-75018, Paris, France

    B. Gachot, J. P. Bédos, B. Veber, M. Wolff & B. Régnier

Authors
  1. B. Gachot
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  2. J. P. Bédos
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  3. B. Veber
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  4. M. Wolff
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  5. B. Régnier
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Additional information

The study was supported by the Délégation à la Recherche Clinique, Assistance Publique-Hôpitaux de Paris

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Gachot, B., Bédos, J.P., Veber, B. et al. Short-term effects of methylene blue on hemodynamics and gas exchange in humans with septic shock. Intensive Care Med 21, 1027–1031 (1995). https://doi.org/10.1007/BF01700666

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  • DOI: https://doi.org/10.1007/BF01700666

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