Residential care and the elderly: the burden of infection.

Long term care facilities (LTCFs) include a variety of different types of healthcare settings, each with their own unique infectious disease problems. This report focuses on the epidemiological considerations, risk factors and types of infections that occur in elderly patients institutionalized in nursing home settings. In the US, the number of patients in nursing homes continues to grow as the population ages. Today, patients in nursing homes have more complicated medical conditions than they did five years ago as they become even more elderly and the trend continues towards shorter and shorter hospital stays in acute care facilities. The patient population in nursing homes is uniquely susceptible to infections because of the physiological changes that occur with ageing, the underlying chronic diseases of the patients and the institutional environment within which residents socialize and live. In addition, in nursing home settings, problems with infections may be more difficult to diagnose because of their subtle presentations, the presence of co-morbid illnesses which obscure the symptoms of infection and the lack of on site diagnostic facilities. Delays in diagnosing and treating infections allow transmission to occur within the facility. Both endemic and epidemic infections occur relatively commonly in nursing homes. The incidence of endemic infections, such as catheter-associated urinary tract infections, lower respiratory infections and skin infections, is influenced by the debility level of the patients. Calculations of infection rates are influenced by the intensity of surveillance methods at each institution. Many endemic infections are unpreventable. Epidemic infections account for 10-20% of nursing home infections. These include clusters of upper or lower respiratory infections, gastroenteritis, diarrhoea, and catheter-associated UTI's. Epidemic infections are potentially preventable with sound infection control practices. Special attention must be paid to promote universal precautions and give certain patients, such as those with known infection or colonization with Clostridium difficile, MRSA or VRE, special consideration. The potential for epidemic infections with antibiotic-resistant organisms is real. In the nursing home setting, attention must be given to develop and support strong infection control programmes that can monitor the occurrence of institutionally-acquired infections and initiate control strategies to prevent the spread of epidemic infections. Education in infection control issues and attention to employee health is essential to enable staff to care appropriately for today's nursing home population and to prepare them for the even more complicated patients who will be cared for in this type of setting in future.

Requirements for infrastructure and essential activities of infection control and epidemiology in hospitals: a consensus panel report. Society for Healthcare Epidemiology of America.

The scientific basis for claims of efficacy of nosocomial infection surveillance and control programs was established by the Study on the Efficacy of Nosocomial Infection Control project. Subsequent analyses have demonstrated nosocomial infection prevention and control programs to be not only clinically effective but also cost-effective. Although governmental and professional organizations have developed a wide variety of useful recommendations and guidelines for infection control, and apart from general guidance provided by the Joint Commission on Accreditation of Healthcare Organizations, there are surprisingly few recommendations on infrastructure and essential activities for infection control and epidemiology programs. In April 1996, the Society for Healthcare Epidemiology of America established a consensus panel to develop recommendations for optimal infrastructure and essential activities of infection control and epidemiology programs in hospitals. The following report represents the consensus panel's best assessment of needs for a healthy and effective hospital-based infection control and epidemiology program. The recommendations fall into eight categories: managing critical data and information; setting and recommending policies and procedures; compliance with regulations, guidelines, and accreditation requirements; employee health; direct intervention to prevent transmission of infectious diseases; education and training of healthcare workers; personnel resources; and nonpersonnel resources. The consensus panel used an evidence-based approach and categorized recommendations according to modifications of the scheme developed by the Clinical Affairs Committee of the Infectious Diseases Society of America and the Centers for Disease Control and Prevention's Hospital Infection Control Practices Advisory Committee.

Requirements for infrastructure and essential activities of infection control and epidemiology in hospitals: A consensus panel report. Society for Healthcare Epidemiology of America.

The scientific basis for claims of efficacy of nosocomial infection surveillance and control programs was established by the Study on the Efficacy of Nosocomial Infection Control project. Subsequent analyses have demonstrated nosocomial infection prevention and control programs to be not only clinically effective but also cost-effective. Although governmental and professional organizations have developed a wide variety of useful recommendations and guidelines for infection control, and apart from general guidance provided by the Joint Commission on Accreditation of Healthcare Organizations, there are surprisingly few recommendations on infrastructure and essential activities for infection control and epidemiology programs. In April 1996, the Society for Healthcare Epidemiology of America established a consensus panel to develop recommendations for optimal infrastructure and essential activities of infection control and epidemiology programs in hospitals. The following report represents the consensus panel's best assessment of needs for a healthy and effective hospital-based infection control and epidemiology program. The recommendations fall into eight categories: managing critical data and information; setting and recommending policies and procedures; compliance with regulations, guidelines, and accreditation requirements; employee health; direct intervention to prevent transmission of infectious diseases; education and training of healthcare workers; personnel resources; and nonpersonnel resources. The consensus panel used an evidence-based approach and categorized recommendations according to modifications of the scheme developed by the Clinical Affairs Committee of the Infectious Diseases Society of America and the Centers for Disease Control and Prevention's Hospital Infection Control Practices Advisory Committee.

Infections and antibiotic resistance in nursing homes.

Infections occur frequently in nursing home residents. The most common infections are pneumonia, urinary tract infection, and skin and soft tissue infection. Aging-associated physiologic and pathologic changes, functional disability, institutionalization, and invasive devices all contribute to the high occurrence of infection. Antimicrobial agent use in nursing homes is intense and usually empiric. All of these factors contribute to the increasing frequency of antimicrobial agent-resistant organisms in nursing homes. Programs that will limit the emergence and impact of antimicrobial resistance and infections in nursing homes need to be developed.

Infection control in long-term-care facilities.

Although patients in long-term-care facilities are at increased risk of infection, little is known about how to practice infection control in this setting. This article reviews risk factors for infection, the components of an infection control program, and particular infections that are important in long-term-care facilities. In addition, special characteristics of long-term-care facilities that challenge the individuals charged with conducting effective infection control programs will be discussed.

The in-training examination in internal medicine.

OBJECTIVE: The In-Training Examination in Internal Medicine (ITE-IM) has been offered to internal medicine trainees annually since 1988 as an instrument for self-assessment. This report outlines the manner in which the test is prepared, reviews the results of annual examinations, and analyzes trends during the past 6 years. DESIGN: Results of each examination were reviewed with regard to the demographic characteristics of persons taking the test, their previous medical training, and their present program affiliations. RESULTS: Then number of residents participating in the ITE-IM has increased steadily over the past 6 years. In 1993, more than 12,000 residents from more than 90% of internal medicine training programs in the United States participated in the examination; the percentage of international medical school graduates taking the examination increased from 27% in 1988 to 47% in 1993. Statistical analyses of each examination have shown it to be reliable, internally consistent, and discriminating. Over the past 6 years, graduates of U.S. medical schools have scored consistently higher than those of international medical schools and schools of osteopathic medicine on all annual examinations. However, in 1993, for residents at all levels of training, the differences in scores between graduates of U.S. medical schools and graduates of international medical schools narrowed substantially. From 1988 to 1993, there has been a trend toward lower scores by every cohort on each subsequent examination. The decreases in scores are most pronounced for graduates of U.S. medical school and those of schools of osteopathic medicine. The lower scores may be caused by either an increased level of difficulty in the examination or decreased knowledge among examinees. CONCLUSIONS: The ITE-IM is a useful instrument to assess the knowledge base of residents and program directors with a reliable evaluation of themselves and their programs in comparison to their national peer groups. It also provides objective data to monitor trends over time in residents' scores and relates them to the changing demographic characteristics of trainees and to innovations in the clinical curricula of internal medicine training programs.

Risk factors and consequences of bacteriuria in non-catheterized nursing home residents.

BACKGROUND: There has been disagreement over the significance of bacteriuria in nursing home residents. METHODS: During an 18-month period, the risks and consequences of bacteriuria (BU) in 195 residents of a skilled nursing facility without indwelling catheters were examined. Clinical and epidemiologic data and urine for culture were collected every 2 weeks to identify risk factors, symptoms, and occurrences of BU. A mean of 23 cultures per resident was collected. RESULTS: Forty-three percent of the study population (35% of men; 47% of women) had "persistent BU" defined as > 10(5) cfu/ml of urine on > 25% of an individual's collected cultures. Women with persistent BU more frequently were incontinent of bowel and bladder (OR 5.3, 6.3, respectively), more likely to be functionally disabled (OR 3.2), to carry a diagnosis of dementia (OR 2.4), and less likely to have suffered a stroke (OR 0.40). Cancer (OR 6.5) was the only risk factor for persistent BU in men. The number of antibiotic courses prescribed, frequency of hospitalizations, and mortality rates were not significantly different between the two BU groups in either men or women. CONCLUSIONS: Persistent BU is common in nursing home residents. The association of bowel and bladder incontinence and functional disability with persistent bacteriuria suggests that treatment or prevention of these risk factors may prevent or decrease the incidence of bacteriuria. There was no evidence of significant adverse outcomes resulting directly from the bacteriuric state. Higher mortality in the bacteriuric group was the result of underlying functional debility and severity of illness rather than the presence or persistence of BU.

Risk factors for postoperative infection.

During a 4-year period, we collected prospective epidemiologic data and intraoperative wound cultures from 1,852 surgery patients at a university-affiliated community hospital in order to identify the critical risk factors for postoperative wound infections and study the impact of perioperative antibiotics on the bacteriology of infected wounds. Stepwise logistic regression analysis revealed four risk factors that were independent of each other and highly predictive for subsequent wound infection. These were the surgical wound class, American Society of Anesthesiologists physical status grouping, duration of surgery, and results of intraoperative cultures. Addition of other variables to our model did not increase the predicted probability of infection. Even though patients with positive intraoperative cultures had an increased rate of infection, this information had limited clinical utility. The predictive value of a positive culture was low (32%), false-positive rate was high (82%), and concordance with isolates from infected wounds was low (41% when both cultures were positive). Patients who had received perioperative antibiotics and who developed infections were frequently infected with organisms that were resistant to the perioperative drug regimen, compared with patients who had not received antibiotics. A better understanding of the variables that affect the epidemiology and pathogenesis of postoperative wound infection will enable us to make more valid comparisons of rates among hospitals, help us to develop more effective infection control strategies and provide us with more effective treatments.

Predictors of intraoperative-acquired surgical wound infections.

During a 4-year period, we collected prospective epidemiological data and intraoperative wound cultures from 1852 surgery patients at a university-affiliated community hospital in order to identify the critical risk factors for postoperative wound infections and study the impact of perioperative antibiotics on the bacteriology of infected wounds. Stepwise logistic regression analysis revealed four risk factors that were independent of each other and highly predictive for subsequent wound infection. These were the surgical wound class, American Society of Anesthesiology (ASA) physical status grouping, duration of surgery and results of intraoperative cultures. Addition of other variables to our model did not increase the predicted probability of infection. Even though patients with positive intraoperative cultures had an increased rate of infection, this information had limited clinical utility because of its low predictive value, high false-positive rate and poor concordance with isolates from infected wounds. Patients who had received perioperative antibiotics and who developed infections were frequently infected with organisms that were resistant to the perioperative drug regimen, compared with patients who had not received antibiotics.

Bacillus species isolates from cerebrospinal fluid in patients without shunts.

Of 849 CSF cultures done at Hartford Hospital, nine were positive for nonanthrax Bacillus species. Differentiation of true nonanthrax Bacillus species infection from contamination requires careful consideration of the clinical findings, the clinical course, and the laboratory data. In seven patients the nonanthrax Bacillus species represented contamination. In two patients the nonanthrax Bacillus species represented true infection. In one of these infected patients, nonanthrax Bacillus species complicated a cranial gun shot wound. Bacillus cereus meningitis developed in the second patient, a premature infant, following sepsis from a contaminated IV catheter. Nonanthrax Bacillus species, especially B cereus, can be resistant to penicillins and cephalosporins when nonanthrax Bacillus species infections are being treated, susceptibility testing should always be performed.

Description of case-mix adjusters by the Severity of Illness Working Group of the Society of Hospital Epidemiologists of America (SHEA).

Hospitals, insurance companies, and federal and state governments are increasingly concerned about reducing patient cost expenditures while maintaining high quality patient care. One method of reducing expenditures has been to tie hospital reimbursement with a prospective payment system based on diagnosis-related groups (DRGs). However, reimbursement under the DRG system is not acceptable for all patients in all hospitals because it is neither an accurate predictor of costs nor of clinical outcome. This deficiency poses significant problems for hospitals because DRGs are used nationwide as the prospective payment system for inpatients covered by Medicare. Several case-mix adjusters have been proposed to modify DRGs to improve their accuracy in predicting costs and outcome. We reviewed five of the most widely available indices: Acute Physiologic and Chronic Health Evaluation (APACHE II), Coded Disease Staging, Computerized Severity Index (CSI), Medical Illness Severity Group System (MEDISGROUPS), and Patient Management Categories (PMC). Recommendations for the use of a single case-mix adjuster cannot be made at this time because all indices have not been compared in sufficiently diverse settings and because some are better predictors of costs while others are better predictors of clinical outcome. Hospital epidemiologists and other infection control practitioners should be informed about these indices and their potential applications as they expand their role beyond infection control problems to issues concerning cost containment, quality assurance, and reimbursement.

Prevention of intraoperative wound contamination with chlorhexidine shower and scrub.

In a prospective, controlled, clinical trial, we found that preoperative showering and scrubbing with 4% chlorhexidine gluconate was more effective than povidone-iodine or triclocarban medicated soap in reducing skin colonization at the site of surgical incision. Mean log colony counts of the incision site were one half to one log lower for patients who showered with chlorhexidine compared to those who showered with the other regimens. No growth was observed on 43% of the post shower skin cultures from patients in the chlorhexidine group compared with 16% of the cultures from patients who had povidone-iodine showers and 5% of those from patients who used medicated soap and water. The frequency of positive intraoperative wound cultures was 4% with chlorhexidine, 9% with povidone-iodine and 14% with medicated soap and water. This study demonstrates that chlorhexidine gluconate is a more effective skin disinfectant than either povidone-iodine or triclocarban soap and water and that its use is associated with lower rates of intraoperative wound contamination.

The impact of preoperative skin disinfection on preventing intraoperative wound contamination.

The efficacy of total body showering and incision site scrub with disinfectant agents was evaluated in a randomized, prospective study of 575 patients undergoing selected surgical procedures. Patients who showered twice with 4% chlorhexidine gluconate had lower mean colony counts of skin bacteria at the surgical incision site in the operating room prior to the final scrub than patients who showered twice with povidone-iodine solution or medicated bar soap. Patients in the chlorhexidine group had no growth on 43% of the incision site skin cultures compared with 16% in the povidone-iodine group and 6% in the soap and water group. Patients who showered and who were scrubbed with chlorhexidine also had lower rates of intraoperative wound contamination. Bacteria were recovered from the wounds of 4% of patients using this regimen compared with 9% for patients who used povidone-iodine and 15% for patients who showered with medicated soap and water and were scrubbed with povidone-iodine. We noted no difference in surgery-specific infection rates among patients in the three treatment groups; however, our sample sizes were too small to evaluate this outcome parameter adequately. These data suggest that preoperative showering and scrubbing with chlorhexidine is an effective regimen to reduce extrinsic intraoperative contamination of the surgical wound from skin bacteria. The efficacy of this regimen to prevent postoperative wound infection needs to be evaluated in a well-designed, carefully controlled prospective trial with adequate numbers of patients to achieve statistically valid conclusions.

Postoperative pneumonia and urinary-tract infection: epidemiology and prevention.

Hospital-acquired pneumonias and urinary-tract infections are important causes of morbidity and mortality in surgical patients, and a great deal of effort has been expended on infection control strategies to prevent their occurrence. Prophylactic antibiotics, used either systemically or topically, are not routinely recommended for the prevention of either of these infections. The beneficial effects of these agents are transient, and they are often in association with the acquisition of colonization or infection with resistant bacteria. New approaches for infection control, not involving antibiotic agents, are being developed to lower the infection rates of both hospital-acquired pneumonias and urinary-tract infections to an irreducible minimum.

Urinary tract symptoms: microbiologic evaluation in rural family practice.

In order to define the etiology of urinary symptoms in rural family practice, this study examines 106 patients (88 women, 18 men) who went to their family physicians in private practice or a resident-faculty practice with genitourinary symptoms. Evaluation of each patient included history, physical examination, urinalysis, and urine or cervical cultures for bacteria, Mycoplasma, and Chlamydia. Using agar plate culturing techniques, 37 patients (35 percent) were identified as having significant urine bacteria. Chlamydia was rarely associated with urinary tract symptoms. Mycoplasma hominis, however, was isolated and felt to be etiologic in 19 (22 percent) of the 88 symptomatic women (P = 0.0026). Older women (mean age 42 years, P less than 0.001) with greater than 5 white blood cells per high-power field (WBC/hpf) on microscopic urinalysis (P less than 0.001) were likely to have cystitis and significant bacteria on urine culture. Younger women (mean age 31 years, P less than 0.001) with less than 5 WBC/hpf (P less than 0.001) had negative urine cultures and were likely to have M. hominis as a pathogen. These results demonstrate that the etiology of genitourinary symptoms seen in rural family practice may vary substantially from those seen in other patient care settings.