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Mekontso Dessap A, Papazian L, Schaller M, Nseir S, Megarbane B, Haudebourg L, Timsit JF, Teboul JL, Kuteifan K, Gainnier M, Slama M, Houeto P, Lecourt L, Mercat A, Vieillard-Baron A. Inhaled nitric oxide in patients with acute respiratory distress syndrome caused by COVID-19: treatment modalities, clinical response, and outcomes. Ann Intensive Care 2023; 13:57. [PMID: 37368036 DOI: 10.1186/s13613-023-01150-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Accepted: 06/07/2023] [Indexed: 06/28/2023] Open
Abstract
BACKGROUND Inhaled nitric oxide (iNO) has been widely used in patients with COVID-19-related acute respiratory distress syndrome (C-ARDS), though its physiological effects and outcome are debated in this setting. The objective of this cohort study was to describe the modalities of iNO use, clinical response, and outcomes in a large cohort of C-ARDS patients. METHODS Multicentre, retrospective cohort study conducted in France. RESULTS From end February to December 2020, 300 patients (22.3% female) were included, 84.5% were overweight and 69.0% had at least one comorbidity. At ICU admission, their median (IQR) age, SAPS II, and SOFA score were 66 (57-72) years, 37 (29-48), and 5 (3-8), respectively. Patients were all ventilated according to a protective ventilation strategy, and 68% were prone positioned before iNO initiation. At iNO initiation, 2%, 37%, and 61% of patients had mild, moderate, and severe ARDS, respectively. The median duration of iNO treatment was 2.8 (1.1-5.5) days with a median dosage of 10 (7-13) ppm at initiation. Responders (PaO2/FiO2 ratio improving by 20% or more) represented 45.7% of patients at 6 h from iNO initiation. The severity of ARDS was the only predictive factor associated with iNO response. Among all evaluable patients, the crude mortality was not significantly different between responders at 6 h and their counterparts. Of the 62 patients with refractory ARDS (who fulfilled extracorporeal membrane oxygenation criteria before iNO initiation), 32 (51.6%) no longer fulfilled these criteria after 6 h of iNO. The latter showed significantly lower mortality than the other half (who remained ECMO eligible), including after confounder adjustment (adjusted OR: 0.23, 95% CI 0.06, 0.89, p = 0.03). CONCLUSIONS Our study reports the benefits of iNO in improving arterial oxygenation in C-ARDS patients. This improvement seems more relevant in the most severe cases. In patients with ECMO criteria, an iNO-driven improvement in gas exchange was associated with better survival. These results must be confirmed in well-designed prospective studies.
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Affiliation(s)
- Armand Mekontso Dessap
- Service de Médecine Intensive Réanimation, Hôpitaux Universitaires Henri-Mondor, AP-HP, 94010, Créteil, France.
- CARMAS research group, Univ Paris Est Créteil, Faculté de Santé, 94010, Créteil, France.
- IMRB, INSERM, Univ Paris Est Créteil, 94010, Créteil, France.
| | - Laurent Papazian
- Médecine Intensive Réanimation, Centre d'Etudes et de Recherches sur les Services de Santé et Qualité de vie EA 3279, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix-Marseille University, 13015, Marseille, France
| | | | - Saad Nseir
- Department of Intensive Care Medicine, Critical Care Center, CHU of Lille, 59000, Lille, France
| | - Bruno Megarbane
- Department of Medical and Toxicological Critical Care, Lariboisière Hospital, INSERM MURS-1144, University of Paris, AP-HP, 2 Rue Ambroise Paré, 75010, Paris, France
| | - Luc Haudebourg
- Service de Pneumologie et Réanimation Médicale du Département R3S, Groupe Hospitalier Pitié-Salpêtrière Charles Foix, AP-HP, Paris, France
| | - Jean-François Timsit
- Medical and Infectious Diseases Intensive Care Unit, Bichat-Claude Hospital and U1137, IAME Université Paris-Cité, AP-HP, 75018, Paris, France
| | - Jean-Louis Teboul
- Service de Medecine Intensive-Reanimation, Hôpital de Bicêtre, AP-HP, 78, rue du Général Leclerc, 94270, Le Kremlin-Bicêtre, France
| | - Khaldoun Kuteifan
- Service de Réanimation Médicale, Groupe Hospitalier de la Région Mulhouse Sud Alsace, 68100, Mulhouse, France
| | - Marc Gainnier
- Réanimation des Urgences, Hôpital de La Timone, Assistance Publique des Hôpitaux de Marseille, Marseille, France
| | - Michel Slama
- Medical Intensive Care Unit, CHU Sud Amiens, Amiens, France
| | | | | | - Alain Mercat
- Department of Intensive Care, University of Angers, Angers, France
| | - Antoine Vieillard-Baron
- Medical Intensive Care Unit, Ambroise Paré Hospital, AP-HP, Boulogne-Billancourt, France
- Inserm UMR 1018, Équipe 5, CESP, Villejuif, France
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Houeto P, Borron SW, Baud FJ, Muszynski J, Buisine A, Gourlain H, Cheftel E, Marlière F. Assessment of erythrocyte cholinesterase activity in victims of smoke inhalation. J Toxicol Clin Toxicol 1999; 37:321-6. [PMID: 10384796 DOI: 10.1081/clt-100102429] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND The nature of the toxic gases that cause death from smoke inhalation is incompletely understood, and the mechanisms leading to incapacitation remain to be determined. Thermal degradation products of various compounds, including phosphorous-based fire retardants, are suspected capable of impairing human cholinesterase activity. The aim of this study was to measure the erythrocyte cholinesterase activity in victims of smoke inhalation. METHODS We prospectively measured the erythrocyte cholinesterase activity in blood samples obtained at the scene of residential fires from 49 fire victims. We compared the results with those in an unmatched group of 45 persons with acute drug poisoning. RESULTS The median (25th-75th percentiles) erythrocyte cholinesterase activity in the 49 fire victims, 1968 IU/L (1660-2276), was significantly lower than in the 45 control subjects 2460 IU/mL (1968-2890), (p = 0.0004). There was no significant difference of the red blood cell counts or plasma protein levels between the 2 groups, while the hematocrit was significantly greater in the fire victims than in the drug-poisoned patients. There was a significant correlation between blood cyanide and carbon monoxide concentrations in the fire victims (r = 0.494, p = 0.002). There was no correlation between erythrocyte cholinesterase activity and either blood cyanide (r = 0.11, p = 0.44) or blood carbon monoxide concentrations (r = 0.04, p = 0.78). CONCLUSIONS We found a significantly lower level of erythrocyte cholinesterase activity in victims of residential fires, when compared with a convenience sample of hospitalized poisoned patients. Despite the limitations of the study, investigations of the toxic gases potentially responsible for impairment of cholinesterase activity and the clinical significance of this lower enzymatic activity merit further investigation.
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Affiliation(s)
- P Houeto
- Université Paris INSERM U26 VII, France
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Abstract
Volatile nitriles are present in cigarette smoke. We tested the hypothesis that the presence of any of four nitriles in the blood can serve as a marker of recent cigarette smoking. We determined the sensitivity and specificity of these nitriles as indicators of daily cigarette smoking in 24 smokers (Group A) and 18 non-smokers (Group B), as well as the correlation between intensity of daily smoking and the blood concentration of acetonitrile. A new head space GLC assay method was used. Of the four nitriles, only acetonitrile was present in the blood of any study subject. Acetonitrile was moderately sensitive (67%) and entirely specific (100%) for self-reported daily smoking. There was fair correlation between blood acetonitrile concentration and the average daily number of cigarettes smoked (r2 = 0.39; P = 0.001), and the mean blood acetonitrile concentration was significantly higher (P = 0.03) among subjects with higher (> 10 cigarettes per day) current cigarette exposure (148.3 +/- 18.0 micrograms/l) than among smokers with low or minimal (1-10 cigarettes per day) exposure (43.3 +/- 6.0 micrograms/l). Thus, acetonitrile in blood appears to be highly specific and a moderately sensitive marker of cigarette smoking with a dose-effect relationship. As such, acetonitrile shows promise as a marker of current cigarette exposure.
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Affiliation(s)
- P Houeto
- Laboratoire de Toxicologie-Hôpital Fernand Widal, Paris, France
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Pery-Man N, Houeto P, Coirault C, Suard I, Perennec J, Riou B, Lecarpentier Y. Hydroxocobalamin vs cobalt toxicity on rat cardiac and diaphragmatic muscles. Intensive Care Med 1996; 22:108-15. [PMID: 8857117 DOI: 10.1007/bf01720716] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Hydroxocobalamin has been shown to be a rapid and powerful antidote in acute cyanide poisoning and to prevent cyanide poisoning during sodium nitroprusside administration. This cobalt-containing compound has been shown to be devoid of significant immediate side effects during acute administration. However, its potential delayed toxicity related to cobalt accumulation in tissue remains unknown. Therefore, we evaluated the toxicity of hydroxocobalamin as compared with that of cobalt salts on rat cardiac and diaphragmatic muscles. METHODS For a 21-day period, rats were treated intraperitoneally with either hydroxocobalamin (70 mg kg-1 per day, n = 14), cobalt chloride hexahydrate (12 mg kg-1 per day, n = 14) or saline (n = 10). Hydroxocobalamin and cobalt chloride groups received equimolar doses of cobalt. We studied: (1) the mechanical properties of isolated left ventricular papillary muscles and diaphragmatic strips, (2) the cardiac and diaphragmatic cobalt tissue concentrations, and (3) the myocardial histological aspect. RESULTS During the study period, no significant increase in body weight was noted in the cobalt-treated group (-4 +/- 1%), which was in contrast to the hydroxocobalamin-treated group (+21 +/- 2%) and the saline-treated group (22 +/- 2%). Compared with controls, the mechanical properties of cardiac and diaphragmatic muscles were unchanged after either hydroxocobalamin or cobalt salt treatments, and myocardial histological characteristics were similar in all groups. Conversely, large amounts of cobalt deposit were observed in the cobalt-treated group in both the diaphragm (41.90 +/- 16.30 vs 0.70 +/- 0.40 mu mol mu g-1 in the control group, P < 0.001) and the myocardium (16.90 +/- 6.40 vs 0.14 +/- 0.01 mu mol mu g-1 in the control group, P < 0.001). After hydroxocobalamin administration, cobalt concentrations were significantly lower in the diaphragm (25.10 +/- 16.50 mu mol mu g-1, P < 0.001 vs cobalt-treated group) and the myocardium (4.50 +/- 1.20 mu mol mu g, P < 0.001 vs cobalt-treated group). CONCLUSION These results indicate that repeated administration of hydroxocobalamin was devoid of significant diaphragmatic and cardiac muscle toxicity and therefore remains a safe antidote for acute cyanide poisoning.
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Affiliation(s)
- N Pery-Man
- INSERM U275-LOA-ENSTA-Ecole Polytechnique, Palaiseau, France
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Houeto P, Borron SW, Sandouk P, Imbert M, Levillain P, Baud FJ. Pharmacokinetics of hydroxocobalamin in smoke inhalation victims. J Toxicol Clin Toxicol 1996; 34:397-404. [PMID: 8699553 DOI: 10.3109/15563659609013809] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
OBJECTIVE Hydroxocobalamin has been proposed as a cyanide antidote. Little is known, however, about its pharmacokinetics in human cyanide poisoning. METHODS We prospectively studied the pharmacokinetics of hydroxocobalamin in 11 smoke inhalation victims of whom all but one had objective evidence of cyanide exposure. Serum hydroxocobalamin levels were followed from just before drug administration to six days after a single 5 g dose of hydroxocobalamin. RESULTS The results (mean +/- standard error) suggest a two compartment model. Distribution half-life is on the order of 1.86 +/- 0.34 h and the elimination half-life 26.2 +/- 2.7 h. The apparent volume of distribution is 0.45 +/- 0.03 L/kg. Renal and total body clearance are 0.31 +/- 0.06 and 0.83 +/- 0.07 L/h, respectively. CONCLUSION The apparent volume of distribution suggests a predominantly extracellular partitioning of the antidote, even in the presence of cyanide, an important factor in terms of its antidotal effect. Hydroxocobalamin's elimination half-life in these cyanide-exposed patients far exceeds those found in previous studies of dogs and minimally-exposed humans. If confirmed, this half-life suggests that a single dose of hydroxocobalamin, sufficiently large enough to bind the cyanide present, should be adequate.
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Affiliation(s)
- P Houeto
- Hôpital Fernand Widal, Université de Paris VII, France
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Houeto P, Hoffman JR, Imbert M, Levillain P, Baud FJ. Relation of blood cyanide to plasma cyanocobalamin concentration after a fixed dose of hydroxocobalamin in cyanide poisoning. Lancet 1995; 346:605-8. [PMID: 7651005 DOI: 10.1016/s0140-6736(95)91437-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Hydroxocobalamin combines with cyanide to form cyanocobalamin. We hypothesised that the amount of cyanocobalamin formed after a fixed dose of hydroxocobalamin given for cyanide poisoning would correlate with initial blood cyanide concentration. We determined blood cyanide concentration in 12 patients exposed to residential fires, and compared this with markers of the amount of cyanocobalamin formed after treatment with 5 g intravenous hydroxocobalamin. All relationships were highly correlated (r2 0.79-0.95), for the whole group, and there appeared to be an almost linear relationship for the 9 patients with initial cyanide concentration below 40 mumol/L. Above this concentration, no further cyanocobalamin was formed from a single 5 g dose of hydroxocobalamin. In one patient with initial blood cyanide concentration of 96 mumol/L, however, plasma cyanocobalamin concentration approximately doubled after a second 5 g dose of hydroxocobalamin. 5 g of hydroxocobalamin appears capable of binding all available cyanide ions for blood cyanide concentrations up to about 40 mumol/L. Beyond this, more hydroxocobalamin must be given for remaining cyanide ions to be bound. This information will allow clinicians to use rapidly measurable plasma cyanocobalamin concentrations to gauge severity of exposure and evaluate adequacy of treatment.
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Affiliation(s)
- P Houeto
- Laboratoire de Toxicologie, Hôpital Fernand Widal, Paris, France
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Abstract
Humans are exposed to ethylenebisdithiocarbamates (EBDCs) from environmental sources. Exposure to EBDCs is chronic for workers in a variety of industries, where EBDCs are used for their properties as slimicides, vulcanization accelerators, antioxidants, and scavengers in waste-water treatment. EBDCs, and particularly the EBDC metabolite ethylenethiourea, have clearly defined, important toxic effects in various animal species, and there is reason to suspect they are carcinogenic in humans. In the absence of definitive information regarding human risk, further studies need to be done. In the interim, regular surveillance of workers with high levels of exposure to EBDCs, with specific attention to markers of thyroid and hepatic pathology, should be considered.
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Affiliation(s)
- P Houeto
- Laboratoire de Toxicologie, Hopital Fernand Widal, Paris, France
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Abstract
1. We report two cases of acute mercury vapour intoxication in humans. The mercury vapour was released from smelting alloys (gold-mercury amalgam). The alloy was apparently contaminated with an unknown amount of mercury. 2. Within half an hour of the incident, the victims began having moderate headache, nausea, lumbar pain and shortness of breath at rest. The patients were treated with BAL (2,3 dimercaptopropanol), followed by DMSA (2,3 dimercaptosuccinic acid). 3. Serial measurements of mercury metal in plasma and in urine were made for ten days. 4. The results suggest that in spite of the treatment, relatively high concentrations of mercury remain in the plasma for a very long time, and this could be explained by the progressive release of mercury from red blood cells and tissues after oxidation. However, BAL and DMSA did not seem to be the most efficient antidotes. They reduce the plasma inorganic mercury uptake at concentrations of < 50 micrograms I-1.
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Affiliation(s)
- P Houeto
- Laboratoire de Biochimie-Toxicologie, Hôpital Fernand Widal, Paris, France
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Laforge M, Buneaux F, Houeto P, Bourgeois F, Bourdon R, Levillain P. Inaccuracies in a Procedure for Cyanide Determination: Reply. J Anal Toxicol 1994. [DOI: 10.1093/jat/18.7.424-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Houeto P, Buneaux F, Galliot-Guilley M, Baud FJ, Levillain P. Determination of hydroxocobalamin and cyanocobalamin by derivative spectrophotometry in cyanide poisoning. J Anal Toxicol 1994; 18:154-8. [PMID: 8065126 DOI: 10.1093/jat/18.3.154] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Hydroxocobalamin (OHCo) and cyanocobalamin (CNCo) are determined directly in biological media, without extraction, by using first derivative spectrophotometry. We diluted 200 mL of plasma, urine, or standards with 1.8 mL of pH 6 buffer (boric acid, potassium dihydrogen orthophosphate, and potassium hydroxide). The first derivative spectra of the dilutions were plotted between 320 and 400 nm. At the exact zero-crossing point for hydroxocobalamin, the derivative values of cyanocobalamin concentration were determined. The same procedure was followed for hydroxocobalamin at the zero-crossing point for cyanocobalamin. The derivative values of the concentration curves are linear in the range 5-100 microM. The minimum detection limit is approximately 5 microM for hydroxocobalamin of cyanocobalamin on the determination of hydroxocobalamin or vice versa, although the spectra strongly overlap. The method is fast and simple to use, thus making it easy to assess the in vivo transformation of hydroxocobalamin into cyanocobalamin after the administration of high doses of hydrocobalamin in cyanide poisoning.
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Affiliation(s)
- P Houeto
- Laboratoire de Biochimie-Toxicologie, Hôpital Fernand Widal, Paris, France
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Laforge M, Buneaux F, Houeto P, Bourgeois F, Bourdon R, Levillain P. A rapid spectrophotometric blood cyanide determination applicable to emergency toxicology. J Anal Toxicol 1994; 18:173-5. [PMID: 8065128 DOI: 10.1093/jat/18.3.173] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Cyanide determination in whole blood can be performed by spectrophotometry after using diffusion coupled with coloration by hydroxocobalamin in a Conway dish. The technique may be accelerated by the use of a heating sheet at 45 degrees C. The method proved to be specific, sensitive, and fast, thus permitting measurements in emergency situations.
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Affiliation(s)
- M Laforge
- Laboratoire de Biochime-Toxicologie, Hôpital Fernand Widal, Paris, France
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Abstract
Hydroxocobalamin is a powerful cyanide antidote that prevents sodium nitroprusside-induced cyanide toxicity. The pharmacokinetics of an i.v. bolus of hydroxocobalamin (70 and 140 mg/kg) were studied in conscious dogs (n = 6). Plasma hydroxocobalamin concentrations were measured using derivative spectrophotometry. The pharmacokinetics were compatible with a two-compartment model with a first-order distribution and elimination rate, and pharmacokinetic parameters were not different between the two doses, except for the elimination half-life. At 70 mg/kg, which is the recommended dose in acute cyanide poisoning, the elimination half-life was 7.36 +/- 0.79 h, the volume of distribution was 0.49 +/- 0.10 L/kg, and the total clearance 0.58 +/- 0.11 L/h. At high doses, hydroxocobalamin has a short elimination half-life and a limited volume of distribution that exceeds blood volume. These results could be useful in elaborating guidelines for the administration of hydroxocobalamin, when repetitive bolus and/or continuous infusion is required.
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