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The risk of needlestick injuries and needlestick-transmitted diseases in the practice of anesthesiology.

Anesthesiologists are at risk for acquiring blood-borne infections through contact with blood or body fluids. From prospective studies, the greatest risk of transmission is through a percutaneous exposure such as needlestick injury. Personal protective equipment such as gloves and gowns do not completely prevent these exposures. Although educational efforts can reduce the frequency of recapping of needles, they generally have not decreased the incidence of needlesticks. Therefore, in addition to practicing universal precautions, anesthesiologists can attempt to reduce their risk of needlestick injuries by eliminating nonessential unprotected needle use, through the use of needleless or protected needle devices (engineering controls) and by modifying anesthetic procedures requiring needles (work practice controls). Needleless or protected needle products are commercially available for use in many procedures performed by anesthesiologists. For tasks that require the use of needled devices, the practitioner should use safe techniques for handling (i.e., one-handed recapping if recapping is needed) and disposal (i.e., puncture-resistant containers) of these devices. Evaluation of the efficacy, cost, and safety of needleless or protected needle products should be continued as they are introduced into wider use. Additionally, anesthesiologists should be encouraged to report needlestick injuries so that appropriate postexposure treatment can be given and so that the incident can be studied to permit design of a work protocol or device to prevent similar accidents in the future.

Anesthesiology

A five-year study of needlestick injuries: significant reduction associated with communication, education, and convenient placement of sharps containers.

OBJECTIVE: To decrease the numbers of needlesticks among healthcare workers. DESIGN: All reported needlestick injuries at Santa Clara Valley Medical Center, San Jose, California, were reviewed, analyzed, and tabulated by the infection control department yearly from 1986 to 1990. SETTING: A 588-bed county teaching hospital in San Jose, California, affiliated with Stanford University. PARTICIPANTS: All employees of Santa Clara Valley Medical Center who reported needlestick injuries on injury report forms. INTERVENTIONS: From April to December 1987, more needle disposal containers were added to as many patient care areas and as close to the area of use as possible. Results of 1986, 1988, 1989, and 1990 analyses were communicated yearly to all personnel, extensive educational programs were conducted in 1987 and 1988, and educational efforts continued in 1989 and 1990. RESULTS: In 1986, there were 259 needlestick injuries at our institution, 22% (32) from recapping. After needle disposal containers were added to all patient care areas, needlestick injuries for 1988 totalled 143, a 45% decrease in the total needlestick injuries and a 53% decrease in recapping injuries. Communication of results to all areas of the hospital and educational activities were started in 1987 and continued through the next 3 years. In 1989, there were 135 needlestick injuries, a decrease of 6% from 1988; recapping injuries decreased 40% from 1988. In 1990, there were 104 needlestick injuries, a 23% decrease since 1989, and a 33% decrease in recapping injuries. The total number of needlestick injuries from 1986 to 1990 decreased by 60%, and those injuries from recapping decreased by 81% to 89%. CONCLUSIONS: We have continued to monitor needlestick injuries, communicate findings to all personnel, and include needlestick prevention in educational programs. We contend that more convenient placement of needle disposal containers, communication of findings, and education do decrease needlestick injuries in healthcare workers.

California

Effect of educational programs, rigid sharps containers, and universal precautions on reported needlestick injuries in healthcare workers.

OBJECTIVE: To evaluate the effect of infection control programs on reported needlestick injuries in a general hospital. DESIGN: Surveillance of all reported needlestick injuries at the University of Cincinnati Hospital was maintained by the infection control department for five years, from 1985 through 1989. Data on individual workers were collected, tabulated on a monthly basis, and reviewed continually to monitor trends in injuries. During this time, the effects of each of three new infection control programs on reported injuries were evaluated sequentially. SETTING: A 700-bed general hospital that serves as the main teaching hospital of the University of Cincinnati. PARTICIPANTS: All employees of University Hospital who reported to personnel health for management of needlestick injuries. INTERVENTIONS: In 1986, an educational program to prevent injuries was initiated and continued throughout the surveillance period. In 1987, rigid sharps disposal containers were placed in all hospital rooms. In 1988, universal precautions were introduced with an intensive inservice. RESULTS: Surveillance identified 1,602 needlestick injuries (320/year) or 104/1,000/year. After the educational program began, reported injuries increased rather than decreased, and this was attributed to increased reporting. Subsequently, after installation of the new disposal containers, reported injuries returned to the levels seen prior to the educational program, but recapping injuries showed a significant decrease from 63/year to 30, or 20/1,000/year to 10. This decrease was observed in nurses but not in other healthcare workers. After universal precautions were instituted, total injuries increased slightly, but recapping injuries remained at 50% of the levels reported prior to the use of rigid sharps disposal containers. CONCLUSIONS: The three infection control programs failed to produce a major reduction in reported needlestick injuries, except for a decrease in recapping injuries associated with the placement of rigid sharps disposal containers in all patient rooms. These observations indicate that new approaches are needed to reduce needlestick injuries.

Accidents, Occupational

Influence of an educational program and mechanical opening needle disposal boxes on occupational needlestick injuries.

OBJECTIVES: To determine whether an educational program had a beneficial impact on healthcare worker needlestick injuries, particularly those caused by recapping. Secondary goals were to evaluate the efficacy of in-room needle-boxes and to determine whether surveillance data were useful when evaluating new products. DESIGN: Survey of employee health department reports. SETTING: Tertiary care teaching hospital. PARTICIPANTS: Healthcare workers who reported needlestick injuries and other blood and body fluid exposures to the employee health department. INTERVENTIONS: Exposure data from the 10 months prior to institution of the educational program and installation of disposal boxes were compared with data from the following 27 months. Additionally, the type of disposal box was changed for the last 9 months of the survey. RESULTS: Needlestick injuries caused by recapping fell significantly following the educational program (p = .005). However, injuries caused by previously disposed needles protruding into the mechanical opening of the needleboxes increased significantly (p = .002). Following a change of needleboxes to a nonmechanical opening design, the latter type of injury declined (p = .052). Total needlestick injuries, most other categories of needlestick injury, and other exposures did not change significantly during the 37 months of the study. CONCLUSIONS: The educational programs appeared to have positive impact on reducing recapping injuries, but many other needlestick categories did not change significantly. Mechanical opening needle disposal boxes appear to present a hazard when compared with fixed opening boxes. Surveillance data appear to be useful in monitoring injuries as well as evaluating products.

Accidents, Occupational

Evaluating needlestick injuries in nursing personnel. Development of a questionnaire.

1. Needlestick injuries are the most common type of occupational injury experienced by nursing personnel. Sixty percent to 90% of needlestick injuries in medical centers are incurred by nurses. 2. Future increases in patient acuity and more advanced technology are likely to increase the risk of nurses experiencing accidental needlesticks. 3. Needle devices that require disassembly of equipment, especially those related to intravenous piggybacks and prefilled cartridge syringes, are placing nurses at an increased risk for injury. 4. Needle-less devices or devices which keep the needle recessed except during intended use have been designed. The assessment instrument can identify needlestick injury incidence and trends and can be used to evaluate and justify the increased costs of purchasing new safety equipment.

Accidents, Occupational

Reported hospital needlestick injuries in relation to knowledge/skill, design, and management problems.

OBJECTIVES: To investigate reported needlestick injuries in hospital workers from an adult learner theory perspective: identifying safe needle device knowledge and practice, and flaws in needle designs and management practices surrounding such problems. DESIGN: Exploratory descriptive study of reported needlestick injuries from hollow needled devices in a hospital. Injured healthcare workers were counseled via hospital protocol, then a survey was filled out containing no identifiers of individual or institution. SETTING: Seventeen Metropolitan Washington, DC, area hospitals. PARTICIPANTS: All workers reporting needlestick injuries during February 1-28, 1990. RESULTS: Seventy-two injuries were reported; there were no multiple injuries to any individual. Thirty-three (45.8%) were to registered nurses (RNs)-more than any other group of workers. Recapping accounted for a higher percentage than any other activity (10 sticks, 14.1%). Of workers incurring recapping injuries, 3 identified a knowledge of a one-handed spearing technique and did not practice it; 4 neither knew nor practiced it. Eighteen (25.0%) were to "down-stream" housekeepers and aides who did not use such devices in their practice. Disposable needle/syringes caused 49.3% of injuries; hypodermic needles on intravenous lines caused 16.9%. Of the needlesticks, 60.6% were after use and before disposal, 4.2% occurred as the worker was putting an item into a needlebox, and 9.9% occurred from needles protruding from inappropriate bags. Many injuries occurred in the first 2 hours of work after being off the previous day, on Sunday, and on Monday. CONCLUSIONS: Of nurses and medical technologists reporting knowledge of a spearing recapping technique, 97.3% suffered injury via other methods. This strongly suggests that knowledge leads to different action. Safer needled devices and needle-free systems would make a safer workplace. Further study is indicated to identify if and why the first two hours after returning to work on Sunday or Monday are risky for needlestick injuries. Management practices must ensure compliance to safe practice both by employees and related medical staff.

Clinical Competence

Needlestick injury: impact of a recapping device and an associated education program.

OBJECTIVE: To determine the impact of the introduction of a plastic shield-shaped device (Needleguard, Biosafe, Auckland, New Zealand) and education program designed to allow safer recapping, on recorded rates of needlestick injury. DESIGN: A before-after trial with a two-year duration of follow-up. SETTING: Tertiary referral hospital. PARTICIPANTS: Nursing and other hospital personnel. RESULTS: Prospectively collected baseline data, together with the results of an anonymous questionnaire of 25% of the hospital nursing staff, defined a reported needlestick injury rate of 6.9 per hundred full-time nursing staff per year. In the pre-intervention period, there were 6.7 needlestick injuries per 100 nursing staff members per year reported. This increased to 15.4 (p less than .0001) needlestick injuries per 100 nursing staff members per year after the intervention. An anonymous survey undertaken at both time periods suggests that the apparent increase in officially reported needlestick injuries is due to an increase in the willingness of nurses to now report previously unreported needlestick injuries. CONCLUSIONS: The impact of the safety device and education program was the more accurate reporting of needlestick injuries; many nursing staff continued to resheath needles contrary to hospital policy. Many staff simply did not use the newly designed safety device. Approaches to improving compliance with such safety devices are considered.

Accidents, Occupational

Needlestick injury in hospital personnel: a multicenter survey from central Italy. The Latium Hepatitis B Prevention Group.

OBJECTIVES: To assess the rate of needlestick injury in hospital personnel in an Italian region. To identify risk factors potentially amendable to correction. DESIGN: Hospital workers undergoing hepatitis B prevaccination testing in 1985 through 1986 were interviewed regarding needlestick injury in the previous year, job category, area of work, years of employment, and other pertinent information. SETTING: Of the 98 public hospitals of the Latium region, 68 participated in the survey: 32 of 55 with less than 200 beds, 20 of 25 with 200 to 300 beds, 11 of 13 with 400 to 900 beds, and all of the 5 with more than 1,000 beds. PARTICIPANTS: All healthcare workers providing direct patient care or environmental services as well as student nurses were invited by the hospital directors to undergo hepatitis B prevaccination testing and vaccination, if eligible. RESULTS: Of 30,226 hospital workers of the 68 participating hospitals, 20,055 were interviewed (66.3%): 47.7% of the 7,172 doctors, 71% of the 14,157 nurses, 55.9% of the 2,513 technicians, and 71.9% of the 6,384 ancillary workers. Needlestick injury was recalled by 29.3%; the rates were 54.9%, 35.3%, 33.8%, 26.5%, 18.7%, and 14.7% in surgeons, registered and unskilled nurses, physicians, ancillary workers, and technicians, respectively. The recalled injury rate was 39.7% and 34.0% in surgical and intensive care areas; in infectious diseases, it was 16.7%. Rates were lower in hospitals with 200 to 300 beds (25.6%). The needlestick injury rate declined from 32% in those with less than 5 years of employment to 28% in those with more than 20 years (p less than .01). Prevalence of HBV infection was higher in student nurses and young workers recalling a needlestick exposure (14.3% and 15.8%, respectively), versus 10.1% and 12.8% in those not exposed (p less than .01 and less than .05, respectively). CONCLUSIONS: Parenteral exposure to blood-borne infectious agents is a relevant risk among healthcare workers in our region, particularly in defined job categories and hospital areas (surgeons, nurses, surgical, and intensive care areas). Immunization and educational efforts should be made along with better designs of devices to reduce the risk of infection.

Hepatitis B

Impact of a shielded safety syringe on needlestick injuries among healthcare workers.

OBJECTIVES: Evaluate the impact of a shielded 3 cc safety syringe on needlestick injuries among healthcare workers. DESIGN: Surveillance study. SETTING: Three medical centers. RESULTS: The total number of needlesticks from all sources rose from 134 during the baseline period to 140 during the study phase. However, the overall rate of needlesticks involving 3 cc syringes decreased from 14/100,000 inventory units to 2/100,000, and the frequency declined substantially at each of the participating medical centers. CONCLUSIONS: These results suggest that shielded syringes and related technology may offer potential for reducing the risk of needlestick injuries among hospital and other healthcare employees. This study should be viewed as a preliminary effort to assess the potential of shielded-syringe technology for reducing the risk of needlestick injuries among healthcare workers. The results are encouraging, but more clinical experience with this new device and longer follow up are essential to provide the data necessary for a definitive assessment of efficacy.

Humans

Needlestick injuries and hepatitis B immunization in Florida paramedics: a statewide survey.

STUDY OBJECTIVES: To determine the incidence of needlestick injury among paramedics working in Florida during 1987, to describe the circumstances surrounding such injuries, and to assess the hepatitis B vaccination status of this group. DESIGN: Survey of a systematic random sample of paramedics using a self-administered questionnaire. SETTING: Florida. TYPE OF PARTICIPANTS: Paramedics. MAIN RESULTS: A completed questionnaire was returned by 300 of 500 paramedics (60%) who received the mailed questionnaire. Sixty-nine paramedics (23%) reported a total of 110 needlestick injuries. More than one third of injuries occurred in conjunction with recapping needles. Almost 62% of reported injuries could have been prevented had proper needle disposal technique been used. Sixty-two percent of paramedics reported having had at least one dose of the hepatitis B vaccine. Sixty-five percent of the unvaccinated paramedics said they would take the hepatitis B vaccine if it was offered free. CONCLUSION: The majority of needlestick injuries among paramedics in Florida could be prevented with proper needle disposal. Offering the hepatitis B vaccine at no charge to paramedics in Florida could increase the vaccination rate substantially.

Adult

Needlestick injury: blood, mononuclear cells, and acquired immunodeficiency syndrome.

INTRODUCTION: Because transmission of HIV to health care workers after needlestick injury has occurred mainly a result of deep insertion of large gauge needles, blood and viable mononuclear cells transferred after needlestick injury were measured. METHODS: Needles of 20 to 27 gauge were filled with HIV-1 seropositive blood and inserted through extracorporeal human skin or parafilm covering physiologic saline solution modified Drabkin's solution, or culture medium, or inserted directly into one of these fluids, to a depth of one third of the needle length (0.5 inch) for 1 second. Volume of blood transferred was measured by both modified Drabkin's method and by chromium 51 labeling of red blood cells. Transfer of viable mononuclear cells was measured by growth in culture medium containing autologous feeder cells. RESULTS: The volume of blood transferred from a needle passed through skin varied from 312 +/- 69 nl from a 20-gauge needle to 14 +/- 4 nl from a 27-gauge needle, as measured by modified Drabkin's technique, and from 404 +/- 80 nl to 12 +/- 3.1 nl, as measured by chromium 51 labeling of red blood cells. The volume of blood transferred from a needle passed through parafilm was twice that transferred through skin. The volume of blood transferred through skin was 40% that transferred directly into fluid not covered by any barrier; blood transferred through parafilm was 80% of that transferred directly. When needles containing blood were inserted into culture medium for 1 second in the absence of a barrier, at least one viable mononuclear cell was almost always transferred to fluid from all gauges of needle tested. Insertion of needles through skin prevented transfer of all viable mononuclear cells from only 3% to 5% of 20- to 23-gauge needles, and from 12% to 32% of 26- and 27-gauge needles. Parafilm was an even less effective barrier than skin. Insertion of needles through parafilm completely prevented transfer of viable mononuclear cells from no 20- to 23-gauge needles and from only 5% to 10% of 26- and 27-gauge needles. CONCLUSION: The volume of blood transferred after needle insertion through skin for 1 second varied with the gauge of the needle and was 30-fold higher from a 20-gauge than from a 27-gauge needle. Variable mononuclear cells were transmitted after insertion through skin from more than 95% of 20- to 23-gauge needles and from 68% to 88% of 26- and 27-gauge needles. Parafilm was less effective than skin in reducing transmission of blood and viable mononuclear cells.

Acquired Immunodeficiency Syndrome

Occupational needlestick injuries: educational program and mechanical opening needle disposal boxes.

1. Needle recapping injuries, which individual employees have considerable ability to prevent, declined significantly following inservice education. 2. The problem of needles protruding into the opening of mechanical lids in needle disposal boxes persisted even after the inservice sessions. When clearlid, nonmechanical opening boxes were used, disposal injuries related to protruding needles declined significantly. 3. An educational program coupled with the appropriate placement of disposal boxes had a beneficial impact on some categories of needlestick injuries, although the total number of needlestick injuries did not decline.

Humans

Needlestick injury in surgeons: what is the incidence?

A prospective study by questionnaire was carried out to investigate the incidence of needlestick injury in the operating theatre staff of a teaching hospital and to calculate the individual risk of acquiring blood-borne virus infection in the UK from this source. The individual rate of needlestick injury in operating theatre staff was 1.55% per surgeon per operation (confidence interval (Cl) 0.6-2.5%). The calculated rate of clinical hepatitis B in surgeons compared with the observed rate suggests that needlestick in theatre is the main mode of transmission.

Accidents, Occupational

Bloody needles: the volumes of blood transferred in simulations of needlestick injuries and shared use of syringes for injection of intravenous drugs.

Residual HIV-infected blood in needles and syringes is a source of HIV infection. Using radiolabelled blood we have stimulated needlestick injuries and sharing of syringes by intravenous drug users and quantified the volumes of blood which could be transferred to recipients in these situations. Up to 0.75 microliters of blood was transferred in needlestick simulations, but there was a large variation. In simulations of needlesharing, seven to ten times more blood was transferred from the index user to the first sharer when 2 ml syringes were used compared with 1 ml syringes. Washing with water was not effective in removing 'infected' blood from a syringe.

HIV Infections

An examination of needlestick injury rates, hepatitis B vaccination uptake and instruction on 'sharps' technique among medical students.

A 12-question survey designed to examine venepuncture techniques and instruction and uptake of hepatitis B vaccination was completed by 172 of the 275 medical students to whom it was distributed (a response rate of 62.5%). Seventy-five injuries were reported, at an average of 0.3 per student per year. Of the respondents, 63% resheathed needles after use, a practice frequently cited as a cause of needlestick injury. However, in this sample resheathing was not significantly associated with a higher or lower injury rate (chi 2 = 2.07, P > 0.1). Of the respondents from the most recent intake, only 20 out of 57 had completed a course of hepatitis B vaccinations prior to the commencement of venepuncture duties. There was almost universal ignorance concerning the correct course of action following 'sharps' injury. Recommendations are made concerning hepatitis B vaccination and teaching strategies for medical students.

Bloodletting

Human infection with B virus following a needlestick injury.

A 26-year-old veterinary technician who became infected with B virus at the site of a needlestick injury is described. After the patient was treated with intravenous acyclovir, all cultures became negative for B virus and have remained so during treatment with oral acyclovir. The literature on infections due to B virus in humans is reviewed, and a detailed discussion of the various aspects of this simian herpesvirus is presented.

Adult