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Evaluation of a course on medical microbiology for non-medical graduate scientists from medical microbiological laboratories.

An assessment of the educational value of a series of courses intended to improve the clinical awareness of non-medical graduate microbiologists has been made. Objective and subjective data were collected by means of questionnaires, pre- and post-course multiple choice tests and informal discussion. The format of the courses are described. The increase in cognitive knowledge acquired during three of the courses is comparable with results from another study in clinical students. The anomalous results from one of the four courses may be explained in terms of the composition of that course. The data presented contribute to the information required for the evaluation and assessment of educational courses.

Curriculum↗

Deficient colour vision and interpretation of histopathology slides: cross sectional study.

OBJECTIVE: To determine whether histopathologists with deficient colour vision make more errors in slide interpretation than those with normal colour vision. DESIGN: Examination of projected transparencies of histopathological slides under standardised conditions by subjects whose colour discriminating ability was accurately assessed. SETTING: Departments of histopathology in 45 hospitals in the United Kingdom. SUBJECTS: 270 male histopathologists and medical laboratory scientific officers. MAIN OUTCOME MEASURES: Number of slides correctly identified by subjects whose colour vision was measured on the Ishihara, City University, and Farnsworth-Munsell 100 hue tests. RESULTS: Mean (SD) scores (out of 10) for doctors with colour deficient vision were 9.4 (0.7) v 9.9 (0.4) for controls (P < 0.01) and 7.5 (1.6) v 9.4 (0.7) for scientific officers (P < 0.001). When subjects with colour deficient vision were categorised into severe, moderate, or mild, there was a significant trend towards those with severe deficiency making more mistakes (P < 0.001). CONCLUSIONS: Histopathologists and medical laboratory scientific officers should have their colour vision tested; if they are found to have a severe protan or deutan deficiency, they should be advised to adopt a safe system of working.

Clinical Competence↗

Safety procedures in clinical laboratories.

Five types of hazards encountered in the clinical laboratory and a list of safety procedures designed to avoid or minimize them are identified. The safety procedures are written in a precise and easy-to-follow manner so that they can be adopted and used in any clinical laboratory. Medical technology educators are encouraged to teach safety procedures and enforce them in the student laboratory.

Accidents, Occupational↗

A ladder curriculum in clinical microbiology.

A continuum of four microbiology courses for medical technology majors has been developed by the Medical Laboratory Science Program at Northeastern University. Using a system approach to curriculum design, the academic and clinical faculty identified career-entry capabilities, delineated appropriate subject content, and developed an instructional system which placed individual topics into one of four courses in the ladder curriculum: a basic, second-year, university-based clinical microbiology course stressing microbial technique and common organism identification; third-year microbiology and cellular physiology courses developing theoretical aspects; a fourth-year, hospital-based clinical microbiology rotation emphasizing isolation and identification techniques for significant pathogens; and a fourth-year, university-based, didactic course covering host defense-organism virulence interactions, infectious disease principles, and new techniques and unusual isolates as reported in the recent journal literature. Based on four years of experience with this system and in light of the publication of the 1978 American Society for Medical Technology (ASMT) Competency Statements, the Northeastern Medical Laboratory Science Program faculty is currently reexamining the continuum to insure completeness and appropriateness of overall subject content, to provide reinforcement, and to remove unnecessary duplication among the courses in the curriculum.

Certification↗

The cultural adaptability of health sciences faculty.

PURPOSE: Health care educators have a major responsibility to prepare future health care practitioners to provide services for culturally diverse clients. As a starting point, prior to making any curricular changes, the cultural adaptability of the faculty needs to be measured; therefore, this study was conducted to determine the cultural adaptability of the faculty within a College of Health Sciences of an urban regional university in Southeastern Virginia. METHODS: The sample consisted of 40 health sciences faculty representing dental hygiene, medical laboratory sciences, nursing and physical therapy. The principal investigator personally administered the Cross-Cultural Adaptability Inventory (CCAI), a 50-item instrument that contains questions to measure the construct cultural adaptability and its four dimensions: emotional resilience, flexibility/openness, perceptual acuity, and personal autonomy. The CCAI is not targeted to one particular culture, but rather is designed to be culture general. RESULTS: Overall, all four faculty groups exhibited higher average CCAI scores than the CCAI norm group which consisted of individuals with cross-cultural experience and training. Analysis of variance revealed no statistically significant difference, at the 0.05 level, in the overall CCAI scores among the health sciences faculty. Analysis of CCAI scores among the health sciences faculty, using analysis of variance revealed no statistically significant difference, at the 0.05 level, in emotional resilience, perceptual acuity, and personal autonomy. In the dimension flexibility/openness, a significant difference was exhibited between the physical therapy and medical laboratory sciences faculty. CONCLUSIONS: These qualities should provide a strong foundation for the development of additional competence in cross-cultural health care and for preparing practitioners who can provide culturally sensitive health care. Further exploration to determine whether a cross culturally adaptable faculty can impart this attribute to students might be to administer the CCAI to entering and exiting students.

Analysis of Variance↗

Allergens in the workplace.

Allergy is an important cause of work-related illness. Data are presented concerning the prevalence and relationship of atopy and hypersensitivity states in persons working as grain handlers, pathologists, and medical laboratory technologists. Studies were carried out in the above occupational groups in the Province of Alberta. A survey of male grain handlers failed to demonstrate significant differences between their serum total IgE levels and allergen specific IgE profiles and those of a control group of sedentary workers. Investigation of pathologists in active practice indicated that 46% of the study group had problems related to formaldehyde. There was no tendency for atopic subjects to be more sensitive to formaldehyde and no subjects had detectable circulating formaldehyde-specific IgE. Since the introduction of Universal Precautions into the clinical laboratory, there has been an increased incidence of hypersensitivity reactions to latex. A controlled investigation of medical laboratory technologists found that, although most subjects with latex glove-related problems had no in vitro evidence of IgE mediated hypersensitivity to latex, three subjects (2.5%) were RAST positive for latex and hence at risk of an anaphylactic reaction with continued exposure to the allergen. A history of atopy was more common in the group with glove-related problems and the severity of the skin reactions documented were more severe in smokers.

Allergens↗

A distributed microprocessing system for laboratory computing.

The concepts and practical implementation of a distributed processing system used for biomedical research demonstrably increase efficiency and cost effectiveness of microprocessor use. The hardware system is based on a minicomputer host and remote microcomputer slaves. Remote microcomputer systems are used for data acquisition and display, whereas the host system is used for data and program storage, as well as program compilation. The software used is the "C" programming language and the Unix operating system. Methods for programming the microcomputer in the higher level language "C" for laboratory usage are described. Examples illustrate how a distributed microprocessor system can be effectively used in a medical laboratory for the common tasks of data acquisition, processing, and display.

Biomedical Engineering↗

Investigating clandestine drug laboratories: adverse medical effects in law enforcement personnel.

A retrospective cohort study was conducted among an international group of 46 law enforcement chemists and 13 Washington State clandestine drug laboratory investigation team members with more than 2,800 combined investigations. Each participant completed a questionnaire concerning previous drug laboratory investigations and adverse health effects during response activities. Methamphetamine laboratories accounted for 81-97% of all responses. Total illness incident rates varied between 0.75-3.4% of responses. Most exposures were through inhalation, and many occurred in the years prior to use of personal protective equipment. Symptoms were primarily those of headache and respiratory, mucous membrane, and skin irritation. Most illness episodes occurred during the processing phase of laboratory responses, and none occurred during the entry phase. A majority of illness episodes occurred in laboratories with leak/spills, fire/explosion, or uncontrolled reactions. Responding to an active laboratory was associated with a 7 to 15-fold risk of becoming ill as compared with setup, in-transit, or former (equipment removed) laboratory responses. No other laboratories characteristics were consistently associated with a significantly elevated relative risk of adverse health effects.

Accidents, Occupational↗

Postanalytical factors and their influence on analytical quality specifications.

Quality thinking in medical laboratories is placed within the framework of the European Foundation for Quality Management Model which suggests the use of medical outcome indicators such as those developed by the Joint Commission on Accreditation of Healthcare Organizations. From here concepts were illustrated to improve the quality of the medical laboratory towards the data produced but moreover towards the information given, the knowledge acquired and the decision taken. Postanalytical factors were used to define analytical quality specifications.

Clinical Laboratory Techniques↗

External quality assessment schemes for clinical chemistry in Germany.

The external quality assessment schemes in clinical chemistry are regulated by the guidelines of the Federal Association of Physicians for Quality Assurance in Medical Laboratories (Richtlinien der Bundesärztekammer zur Qualitätssicherung in Medizinischen Laboratorien) which are part of a legal act. The basis of the mandatory quality assessment in medical laboratories is the internal accuracy and precision control. The target values for the internal accuracy and external quality control are determined by method-independent reference methods as far as possible. But for most of the analytes method-dependent assigned values are determined by expert laboratories. The decision limits for the internal and external quality control are derived from the interindividual dispersions of the analytes of a normal population (reference intervals) and should meet the medical requirements. The advantages of method-independent target values are discussed.

Chemistry, Clinical↗

Analysis of results of toxicological examinations performed by coroners' or medical examiners' laboratories in 2000 drug-involved deaths in nine major U. S. cities.

Data were collected on 2000 deaths in which psychoactive drugs were involved. The data were submitted by medical examiners or coroners in nine U. S. cities from their case files. The 2000 cases comprise a representative sample from each of these cities of deaths from psychoactive drugs between 1972 through 1974. This report details inter-city differences in methods and practices of the toxicological examination as well as the type and numbers of drugs reported. Even when the same analytical method was used in various cities, there were differences in extraction solvent and extraction pH. Of the 3909 drugs detected, 2945 were quantitated; the number of drugs quantitatively measured per case studied ranged from a low of 0.82 for New York to a high of 2.20 for Washington, D.C. The number of different drugs quantitatively measured varied from 16 for New York to 30 for San Francisco; however, New York qualitatively assayed for the presence of a total of 25 drugs. The number and type of drugs found per case varied. Methadone, for example, was found in 60% of the cases reported by New York and in 49% of the cases from Washington, D.C., but in only about 10% of cases reported by Philadelphia, Dallas, Miami, and San Francisco, and in less than 1% of Los Angeles and Cleveland cases; it was not reported by Chicago. Phenmetrazine-caused deaths were reported only by Dallas (one case) and Washington, D.C. (29 cases). From the data as a whole, information is presented for 33 drugs as to the concentration in physiological tissues and fluids. Analysis of single psychoactive drug cases and single-drug-plus-ethanol cases shows that, in the presence of ethanol, the toxic blood concentration of imipramine, amytriptyline, meprobamate, thioridazine, morphine, propoxyphene, methaqualone, and all barbiturates was decreased by an average of 50%.

Forensic Medicine↗

Rates of Chlamydia trachomatis testing and chlamydial infection in pregnant women.

AIMS: To determine the rate of Chlamydia trachomatis testing and chlamydial infection in pregnancy (by auditing a community medical laboratory database). METHODS: Data for women registered with a maternity care provider between 1999 and 2002 were matched with a community medical laboratory database for patients who met one of three criteria: tested for C. trachomatis, or had a first or second antenatal blood screen at that laboratory. The rate of C. trachomatis testing and of chlamydial infection was then calculated in this sample. RESULTS: The overall rate of C. trachomatis testing for 6614 matched deliveries was 37.5%, with 4.8% of those tests positive for chlamydial infection. The rate of testing differed significantly between age-bands (p<0.0001), and by ethnicity (p<0.0001). The rate of infection showed a significant effect of age (p<0.0001) and ethnicity (p<0.0001). Maori and Pacific women, and those under the age of 25 years, had the highest rates--both of testing and of C. trachomatis infection. CONCLUSIONS: There is a high rate of maternal C. trachomatis in under 25-year-olds, and in Maori and Pacific women, together with incomplete testing for the infection in pregnancy. This highlights the need to instigate routine testing for C. trachomatis in pregnancy--to reduce the significant, yet preventable, morbidity associated with chlamydia in both the mother and the neonate.

Adolescent↗

Inability of community-based laboratories to identify pathological casts in urine samples.

OBJECTIVE: To determine the accuracy of microscopic examination of urine from patients with known renal disease, performed by community-based laboratories. DESIGN: Twenty-six urine specimens from 7 children with Alport syndrome, lupus nephritis, and IgA nephropathy were simultaneously submitted to 4 investigative sites: 2 community-based medical laboratories (laboratories A and B), and the offices of 2 nephrologists (nephrologists C and D). Participants A, B, and C were unaware of the nature of this investigation and blinded to the diagnosis associated with each specimen. RESULTS: Twenty-six specimens from 7 children were analyzed. Pathological casts were identified in the 26 submitted specimens in the following order: 1 (4%) by laboratory A, 2 (8%) by laboratory B, 20 (77%) by nephrologist C, and 26 (100%) by nephrologist D. Four-way and 3-way (A, B, C) comparisons using the chi 2 test are significant at the P < .001 level. CONCLUSIONS: The 2 community-based medical laboratories participating in this study did not accurately identify pathological casts in urine specimens routinely submitted to them. In addition to raising quality assurance issues, these misleading reports may result in inaccurate diagnosis and unnecessary laboratory and diagnostic investigations.

Diagnostic Errors↗