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Emergency and Acute Medicine – Needlestick Injury
Needlestick and other sharps injuries are a common occupational hazard in healthcare and emergency settings, resulting in potential exposure to blood or body fluids. Exposure can occur through percutaneous injury, mucous membrane contact, or contact with nonintact skin. Prevention remains the cornerstone of management and includes strict adherence to universal precautions, avoidance of needle recapping, consistent glove use (with double gloving when appropriate), and compliance with body–substance isolation protocols. Wearing gloves can reduce the volume of blood exposure by approximately 50%, and hepatitis B vaccination is a critical preventive strategy for all at-risk personnel.
The risk of infection following a single needlestick exposure depends on the pathogen involved, characteristics of the exposure, and host factors. Without prior immunization, the risk of hepatitis B virus (HBV) transmission ranges from 37–62% when the source is HBsAg- and HBeAg-positive, and 23–37% when the source is HBsAg-positive but HBeAg-negative. The risk of hepatitis C virus (HCV) transmission is approximately 1.8%. HIV transmission risk is lower, estimated at 0.3% for percutaneous exposure and 0.09% for mucous membrane exposure. Infectivity also varies by body fluid, with plasma and serum carrying the highest viral concentrations and fluids such as urine, saliva, tears, and vaginal secretions having much lower concentrations. Factors that influence transmission risk include viral load, depth of inoculation, type and size of needle, duration of contact, volume of injected material, portal of entry, host susceptibility, and the presence of protective barriers such as gloves.
Evaluation begins with a detailed history documenting the date, time, and circumstances of exposure, the type of body fluid involved, and information about the source patient if known. Immunization history, particularly hepatitis B vaccination status, must be reviewed. Women of childbearing potential who may require antiviral prophylaxis should undergo pregnancy testing. Baseline laboratory evaluation should ideally be coordinated through occupational health services and includes serologic testing for HIV, HBV, and HCV, along with alanine aminotransferase levels. Consent should be obtained from the source patient, when possible, for HIV, HBV, and HCV testing, including the use of rapid HIV testing when available.
Immediate management focuses on local wound care with copious washing and cleaning of the exposure site. Tetanus prophylaxis should be updated as indicated. Prompt referral to occupational health is preferred to ensure confidentiality and continuity of care; however, if unavailable, evaluation and initiation of postexposure prophylaxis (PEP) should occur in the emergency department without delay. Timely initiation of prophylactic therapy is critical, particularly for HIV exposure, where treatment is most effective when started as soon as possible and continued for 28 days.
HIV postexposure prophylaxis recommendations are guided by the severity of exposure and the HIV status and viral load of the source patient. Depending on these factors, either a basic two-drug regimen or an expanded regimen with three or more antiretroviral agents is recommended. Counseling is an essential component of care and includes advice on safer sex practices, avoidance of pregnancy, blood or tissue donation, and breastfeeding during the follow-up period.
Management of hepatitis B exposure depends on the vaccination and immune status of the exposed individual and the HBV status of the source. Options include no treatment for adequately immunized individuals with protective antibody titers, initiation of the hepatitis B vaccine series for unvaccinated individuals, and administration of hepatitis B immune globulin for high-risk exposures or known nonresponders. In contrast, there is no proven prophylaxis for hepatitis C exposure; immunoglobulin and antiviral agents have not demonstrated consistent benefit, though early identification and treatment of established infection may improve outcomes.
Needlestick injuries rarely require hospital admission and are typically managed on an outpatient basis with close follow-up through occupational medicine services. Clear discharge instructions and follow-up plans are essential to ensure adherence to prophylactic regimens, completion of vaccination series when indicated, and serial testing to monitor for seroconversion.
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