Chlorine Poisoning Follow-up
- Author: Daniel Noltkamper, MD, FACEP; Chief Editor: Robert G Darling, MD, FACEP more...
Further Inpatient Care
Pulmonary edema may present in a delayed fashion after chlorine gas exposure.
Patients who present asymptomatic and remain asymptomatic 6 hours after exposure may be discharged with appropriate instructions and in the presence of reliable family members.
Admit patients who present with symptoms that continue for 6 hours after exposure for an observation period of at least 24 hours. If asymptomatic at 24 hours, patients may be discharged with appropriate follow-up care.
Consider patients exposed to large concentrations in an enclosed environment, those with underlying cardiopulmonary disorders, and children for admission and observation, even if initially asymptomatic.
Further Outpatient Care
- Discharge medications are not applicable since only asymptomatic patients should be discharged from the ED.
- Cases of chronic reactive airway disease after acute exposures to chlorine gas are described in the literature. Consider referring patients for pulmonary function testing.
Transfer
- Consider transfer to a higher level of care when patients cannot be treated locally. The major concern is the treatment of noncardiogenic pulmonary edema that may require positive pressure ventilation.
Deterrence/Prevention
- Proper labeling and avoiding mixing chemicals facilitate prevention. Household cleaning products should not be mixed. Using proper precautions when handling swimming pool chemicals reduces risks. Adequate ventilation is necessary when handling any potentially noxious chemical.
- On a larger scale, chemical warfare treaties between countries and the safe transportation and handling of industrial chlorine compounds facilitate deterrence.
- Training prehospital and hospital providers in the management of chemical casualties can improve the treatment provided to exposed personnel while minimizing personal risks. Hospitals can establish mass casualty plans and perform drills to ensure that preparations are adequate in the event of a large-scale industrial accident.
Complications
- Short-term effects: Bacterial superinfection resulting in bronchitis or pneumonia may present 3-5 days after chlorine gas exposure. Search for infection if the patient fails to recover from chlorine gas toxicity in 3-4 days. Pleural effusions associated with pulmonary edema are possible.
- Long-term effects: Long-term complications from exposure are rare, but some reports of chronic reactive airway disease following exposure exist. Other authors attribute these consequences to bacterial superinfection or smoking.
Prognosis
- Most individuals exposed to chlorine gas recover without significant sequelae. Even exposure to high-concentration chlorine gas is unlikely to result in significant, prolonged pulmonary disease.
Patient Education
- Educate patients on the risks associated with the improper handing of chlorine pool chemicals and the improper mixing of household cleaning chemicals.
- For excellent patient education resources, visit eMedicine's Bioterrorism and Warfare Center and Procedures Center. Also, see eMedicine's patient education articles Chemical Warfare, Personal Protective Equipment, and Bronchoscopy.
D'Alessandro A, Kuschner W, Wong H, Boushey HA, Blanc PD. Exaggerated responses to chlorine inhalation among persons with nonspecific airway hyperreactivity. Chest. Feb 1996;109(2):331-7. [Medline].
Baxter PJ. Gases. In: Hunter's Diseases of Occupations. 1994:213-235.
Beckett WS. Inorganic gases. In: Textbook of Clinical Occupational and Environmental Medicine. 1994:838-843.
Blanc PD, Galbo M, Hiatt P, Olson KR. Morbidity following acute irritant inhalation in a population-based study. JAMA. Aug 7 1991;266(5):664-9. [Medline].
Demeter SL, Cordasco EW. Reactive airway disease after chlorine gas exposure [letter; comment]. Chest. Sep 1992;102(3):984. [Medline].
Gjonaj ST, Lowenthal DB, Dozor AJ. Nebulized lidocaine administered to infants and children undergoing flexible bronchoscopy. Chest. Dec 1997;112(6):1665-9. [Medline].
Glindmeyer HW, Lefante JJ, Freyder LM, et al. Relationship of asthma to irritant gas exposures in pulp and paper mills. Respir Med. May 2003;97(5):541-8. [Medline].
Graham DR. Noxious gases and fumes. In: Textbook of Pulmonary Disease. 1994:901-916.
Horton DK, Berkowitz Z, Kaye WE. The public health consequences from acute chlorine releases, 1993-2000. J Occup Environ Med. Oct 2002;44(10):906-13. [Medline].
Joy RJ. Historical aspects of medical defense against chemical warfare. In: Textbook of Military Medicine: Medical Aspects of Chemical and Biologic Warfare. 1997:87-109.
Kennedy SM, Enarson DA, Janssen RG, Chang-Yeung M. Lung health consequences of reported accidental chlorine gas exposures among pulpmill workers. Am Rev Respir Dis. Jan 1991;143(1):74-9. [Medline].
Moore BB, Sherman M. Chronic reactive airway disease following acute chlorine gas exposure in an asymptomatic atopic patient. Chest. Sep 1991;100(3):855-6. [Medline].
Nelson LS. Simple asphyxiants and pulmonary irritants. In: Goldfrank's Toxicologic Emergencies. 1998:1529-1530.
Parrish JS, Bradshaw DA. Toxic inhalational injury: gas, vapor and vesicant exposure. Respir Care Clin N Am. Mar 2004;10(1):43-58. [Medline].
Rabinowitz PM, Siegel MD. Acute inhalation injury. Clin Chest Med. Dec 2002;23(4):707-15. [Medline].
Schonhofer B, Voshaar T, Kohler D. Long-term lung sequelae following accidental chlorine gas exposure. Respiration. 1996;63(3):155-9. [Medline].
Segal E, Lang E. Toxicity, Chlorine Gas. eMedicine Journal [serial online]. 2000. [Full Text].
Smart JK. History of chemical and biologic warfare: An American perspective. In: Textbook of Military Medicine: Medical Aspects of Chemical and Biologic Warfare. 1997:9-86.
Traub SJ. Respiratory agent attack (toxic inhalational injury). In: Ciottone GR. Disaster Medicine. 3rd ed. Philadelphia, PA: Mosby Elsevier; 2006:573-575/ chap 93.
Urbanetti JS. Toxic inhalational injuries. In: Textbook of Military Medicine: Medical Aspects of Chemical and Biologic Warfare. 1997:247-270.
Vinsel PJ. Treatment of acute chlorine gas inhalation with nebulized sodium bicarbonate. J Emerg Med. May-Jun 1990;8(3):327-9. [Medline].
Wadbrook PS. Advances in airway pharmacology. Emerging trends and evolving controversy. Emerg Med Clin North Am. Nov 2000;18(4):767-88. [Medline].
White CW, Martin JG. Chlorine gas inhalation: human clinical evidence of toxicity and experience in animal models. Proc Am Thorac Soc. Jul 2010;7(4):257-63. [Medline].

