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Health and Safety at Necropsy J L Burton 254 REVIEW J Clin Pathol: first published as 10.1136/jcp.56.4.254 on 1 April 2003. Downloaded from Health and safety at necropsy J L Burton ............................................................................................................................. J Clin Pathol 2003;56:254–260 The postmortem room is a source of potential hazards cution; and finally (but rarely) poisoning, as a and risks, not only to the pathologist and anatomical result of chemicals and/or radiation. Conse- quently, this review discusses the “high risk” (of pathology technician, but also to visitors to the mortuary infection) necropsy, dangerous foreign objects, and those handling the body after necropsy. Postmortem and the contaminated body. First, however, it is staff have a legal responsibility to make themselves useful to consider the nature of risks and hazards. aware of, and to minimise, these dangers. This review RISKS AND HAZARDS focuses specifically on those hazards and risks Although these terms are often used interchange- associated with the necropsy of infected patients, with ably, they are not synonymous in the context of foreign objects present in the body, and with bodies health and safety. The danger of injury posed by a slippery floor, the sharp corner of a table, the that have been contaminated by chemicals or blade of a knife or saw, or the point of a needle radioactive sources. represents a hazard. In contrast, the chance of .......................................................................... acquiring a blood borne infection such as hepati- tis B virus (HBV) or human immunodeficiency virus (HIV) from a sharps injury represents a “Quidquid agis, prudenter agas, et respice risk.13 21 finem.” (Whatever you do, do cautiously, Pathogens may be acquired by inhalation (of and look to the end.) Anon. aerosols), ingestion, direct inoculation, entry though pre-existing breaks in the skin, and “The chapter of knowledge is very short, through the mucous membranes of the eyes, but the chapter of accidents is a very long nose, and mouth. Any procedure that may result one.” Lord Chesterfield, 1694–1773. in infection through one of these routes consti- tutes a hazard.21 he mortuary can be a dangerous place. Most http://jcp.bmj.com/ dangerous in this environment is the indi- THE HIGH RISK (OF INFECTION) Tvidual who is ignorant of, or who ignores, the NECROPSY potential hazards at necropsy. Such people are a Occupationally acquired infections, particularly liability to themselves, colleagues working in the “hazard group 3” risk infections, can have a dev- 26 27 mortuary (pathologists and anatomical patho- astating impact on the health care worker. logy technicians (who have the highest rate of Knowledge of the risks of infection is therefore 1 essential. Accidental exposures to high risk necropsy related morbidity )), visitors to the mor- on September 29, 2021 by guest. Protected copyright. tuary (clinical staff and students), and those pathogens are uncommon but not infrequent, 28 29 involved in handling the body (relatives, funeral and many could be prevented. directors,23 embalmers,45 and crematoria staff), or material derived from it (laboratory workers3) “The decline in mortuary acquired after necropsy. The decline in mortuary acquired infections such as tuberculosis and blood infections such as tuberculosis and blood borne borne hepatitis in the past 25 years can be hepatitis in the past 25 years can be largely attrib- largely attributed to the increased uted to the increased awareness and adoption of awareness and adoption of safe working 6–9 safe working practices. practices” There is a considerable body of literature and legislation pertaining to the design and provision The high risk necropsy can be defined as the of a safe working environment10 11 and safe work- 12–20 “postmortem examination of a deceased person ing practices within the mortuary. It is not my who has had, or is likely to have had, a serious intention to focus on this, because such general infectious disease that can be transmitted to principles have been discussed in detail 21–23 those present at the necropsy, thereby causing ....................... elsewhere. Neither will I discuss general them serious illness and/or premature death”.30 aspects of laboratory health and safety, such as The principal biological risks faced by mortuary Correspondence to: handwashing, how to handle sharps, or the Dr J L Burton, Academic prohibitions on eating, drinking, smoking, and Unit of Pathology, E-Floor Medical School, Beech Hill the application of cosmetics that apply in the ................................................. Road, Sheffield S10 2RX, mortuary. Instead, this review will focus on Abbreviations: UK; [email protected] specific dangers faced at necropsy. Such dangers CI, confidence interval; HBV, hepatitis B virus; HCV, hepatitis C virus; HIV, human include: the acquisition of “category 3” risk immunodeficiency virus; OR, adjusted odds ratio; TSE, Accepted for publication 24 25 16 October 2002 pathogens ; injuries (with the concomitant transmissible spongiform encephalopathy; v-CJD, variant ....................... dangers of haemorrhage and sepsis) and electro- Creutzfeldt-Jakob disease www.jclinpath.com Health and safety at necropsy 255 workers are the infections caused by Mycobacterium tuberculosis, staff caring for a patient who died of unsuspected tuberculo- the blood borne hepatitides, HIV, and agents responsible for sis showed a skin test conversion, whereas all five non-reactors J Clin Pathol: first published as 10.1136/jcp.56.4.254 on 1 April 2003. Downloaded from transmissible spongiform encephalopathies (TSE), such as present at the necropsy converted from negative to positive variant Creutzfeldt-Jakob disease (v-CJD).3 All of these and two of these developed positive sputum cultures.40 Kantor pathogens retain their infectivity after death.31–35 et al observed a similar preponderance of nosocomial infection Such diseases are frequently asymptomatic and may be among postmortem workers.34 present without morphological evidence at necropsy.34 The social stigma attached to those in groups at high risk of Human immunodeficiency virus acquiring such infections means that both the clinical team The necropsy is a valuable investigation in patients who have and the mortuary staff (including the pathologist) may be died from AIDS because it permits clinicopathological follow unaware of the risk associated with the necropsy.36–38 For up, elucidation of the descriptive clinical pathology and epide- example, it is estimated that there are more than 11 000 cases miology of HIV disease, validation of endpoints in clinical of undiagnosed HIV infection in the UK.39 The presence of trials, assessment of drug efficacy and toxicity, accumulation such pathogens may not become known until after the gross of tissue for further research, and medical education.53 HIV examination.34 40 This becomes less worrisome if all staff in the serophobia has been documented among staff working in mortuary regard every necropsy as a potential source of these mortuaries handling high risk cases since the 1980s,53–57 pathogens, regardless of whether or not an infection has been although there is no evidence that HIV is readily acquired in documented in the medical notes, and irrespective of whether the mortuary. Consequently, it is difficult to justify refusal to the patient is known to belong to a high risk group. This is undertake necropsies on patients with such infections.53 58 especially prudent in medicolegal cases, where the pathologist Indeed, Gottfried57 has suggested that “those individuals who often has to rely on the brief non-medical notes provided by remain unwilling to expose themselves to high risk patients or the coroner’s officer.41 specimens, even after expert counselling, should be advised to Let us consider first the risks of acquiring such pathogens at seek a change of career”. However, pathologists (and other necropsy, before discussing strategies for reducing such risks. mortuary workers) should not undertake such cases if they are themselves immunosuppressed (and hence at risk of Mycobacterium tuberculosis acquiring opportunistic pathogens from such cases),53 have It has long been known that staff working in the mortuary are uncovered wounds, weeping skin lesions, or other at risk of occupational infection with M tuberculosis. The litera- dermatitides.58 ture abounds with reported cases of acquired pulmonary40 42–46 47 Most health care workers found to be HIV seropositive have and cutaneous infection. Indeed, René Laennec (1781–1826; a history of behavioural (male homosexual contact or inventor of the stethoscope) died of the disease, having 59 48 intravenous drug use) or transfusional exposure. Occupa- acquired it from the dissection of tuberculous cadavers. tional exposure to HIV is uncommon,60 61 and the overall risk of Xavier Bichat (1771–1802), regarded as the “Father of Histol- seroconversion after contact with HIV positive blood is low ogy” and performer of some 600 necropsies in the year of his 28 29 62 63 49 (seroconversion rate, 0–0.42%). Most documented death, also succumbed to the disease. cases of HIV seroconversion after occupational exposure Pulmonary tuberculosis accounts for approximately 90% of occurred after needlestick injuries (the most common source cases and is acquired by inhalation of aerosols or dried of exposure20 28 64). The estimated HIV transmission rate after a material.43 Cutaneous infection (“prosector’s paronychia”, single percutaneous
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