Inhalation of toxic gases can lead to pneumonitis. It has been known that methane gas intoxication causes loss of consciousness or asphyxia. There is, however, a paucity of information about acute pulmonary toxicity from methane gas inhalation. A 21-year-old man was presented with respiratory distress after an accidental exposure to methane gas for one minute. He came in with a drowsy mentality and hypoxemia. Mechanical ventilation was applied immediately. The patient's symptoms and chest radiographic findings were consistent with acute pneumonitis. He recovered spontaneously and was discharged after 5 days without other specific treatment. His pulmonary function test, 4 days after methane gas exposure, revealed a restrictive ventilatory defect. In conclusion, acute pulmonary injury can occur with a restrictive ventilator defect after a short exposure to methane gas. The lung injury was spontaneously resolved without any significant sequela.
Byard RW, Wilson GW. Death scene gas analysis in suspected methane asphyxia. Am J Forensic Med Pathol 1992;13:69-71.
Terazawa K, Takatori T, Tomii S, Nakano K. Methane asphyxia: coal mine accident investigation of distribution of gas. Am J Forensic Med Pathol 1985;6:211-4.
Kucuker H. Occupational fatalities among coal mine workers in Zonguldak, Turkey, 1994-2003. Occup Med (Lond) 2006;56:144-6.
Knoblauch A, Steiner B. Major accidents related to manure: a case series from Switzerland. Int J Occup Environ Health 1999;5:177-86.
Beaver RL, Field WE. Summary of documented fatalities in livestock manure storage and handling facilities: 1975-2004. J Agromedicine 2007;12:3-23.
Baldursdottir S, Sigvaldason K, Karason S, Valsson F, Sigurdsson GH. Induced hypothermia in comatose survivors of asphyxia: a case series of 14 consecutive cases. Acta Anaesthesiol Scand 2010;54:821-6.
Wallace GM, Brown PH. Horse rug lung: toxic pneumonitis due to fluorocarbon inhalation. Occup Environ Med 2005;62:414-6.
Parra ER, Noleto GS, Tinoco LJ, Capelozzi VL. Immunophenotyping and remodeling process in small airways of idiopathic interstitial pneumonias: functional and prognostic significance. Clin Respir J 2008;2:227- 38.
Weibrecht KW, Rhyee SH. Acute respiratory distress associated with inhaled hydrocarbon. Am J Ind Med 2011;54:911-4.