Medical evaluation for respirator use

The purpose of a respirator is to prevent the inhalation of harmful airborne substances or to provide a source of respirable air when breathing in oxygen-deficient atmospheres. For a physician to recommend the use of respirator, general background information on respiratory-protective devices is required. The first part of this clinical practice review describes the general aspects of industrial hygiene, respirators and a respirator-certification program. The second part addresses matters related to medical certification for respirator use. Medical certification for respirators is an important part of the activities of the occupational physician. To determine whether a worker is able to tolerate the added strain of a respiratory protective device is a complex process in which factors such as fitness for work, health of the individual, characteristics of the work itself, and the properties, type, and requirements of the respiratory protective device, have to be considered. Medical certification is of utmost importance for respirator use, and it should be viewed as an element in a comprehensive respiratory protection program. A comprehensive program is the key element in affording the workers' effective respiratory protection once the initial steps of the hierarchy of methods of hazard control have proved insufficient or infeasible. As a result, the need for the industrial hygiene/safety officer, the worker, the employer and the medical professional to work as a team is much more than in any other field of occupational medicine--a necessary requirement for making the right decision.

Patient factors and compliance with asthma therapy

Compliance by patients to prescribed treatment regimens can be considered as the interface between effective therapy and effective disease management. Compliance can be affected by the nature of the relationship between the practitioner and the patient, and their attitudes towards each other. It has also been suggested that practitioner behaviour can influence patient behaviour and health status. However, each individual patient is influenced in his or her attitudes, and reactions to disease and its management, by a wide variety of patient-related factors. These include psychological variables such as mood, beliefs, and the knowledge, motivation and ability of the patient. Social factors may also play a role: these include age, marital and socioeconomic status and level of education. Results from a range of studies in patients with pulmonary or other diseases show that the psychosocial determinants of compliance are only poorly understood, and suggest that compliance cannot be predicted from patients' health status and that social factors are weak indicators only. Furthermore, it appears from available data that patients' beliefs about health issues are not as useful as indicators of likely compliance as was previously believed.

A new class of cobalamin transport mutants (btuF) provides genetic evidence for a periplasmic binding protein in Salmonella typhimurium

No periplasmic binding protein has been demonstrated for the ATP-binding cassette (ABC)-type cobalamin transporter BtuCD. New mutations (btuF) are described that affect inner-membrane transport. The BtuF protein has a signal sequence and resembles the periplasmic binding proteins of several other ABC transporters.

Absconding: how and when patients leave the ward

Information about how and when patients abscond from acute psychiatric wards may provide important clues to effective prevention strategies. This paper reports relevant findings from a large scale study of absconding conducted in the East End of London. In contrast to the findings in previous studies, the vast majority of absconders left from the ward directly, mostly via the front door. Some were known to be at risk of absconding, and although more than half had declared their intention to leave, they still succeeded in getting away. On some occasions they circumvented locked or guarded doors, or special nursing observation. Shift handovers were a peak time for absconds, possibly due to decreased nursing surveillance of the ward. Most absconds occur during the first few weeks of admission, and most absconders simply went home and engaged in normal, everyday activities. The findings indicate that physical security measures alone are not a sufficient answer to the problem of absconding, and nurses need to work harder to develop supportive alliances with patients.

Absconding: nurses views and reactions

Absconding from acute psychiatric wards is common. This paper reports the views of 25 staff nurses working on acute mental health wards in East London about absconding. Interviews explored how staff feel when a patient absconds, the complexities of risk assessment and observation policies, who is blamed when patients abscond and what might reduce absconding. The assessment of the level of risk which a patient posed varied considerably, with some wards using standard risk assessment tools and others talking about their own methods. There was some evidence of conflict with medical staff about what measures should be put in place to manage the risk (observation level, leave). The interviewees were aware of serious consequences of absconding, and this made them worry when patients absconded. Following an abscond most nurses look for an explanation, and this can lead to blame of other members of the team. A sizeable minority spoke of feeling unsupported by their managers, and that their jobs could be at risk following an abscond. The nurses felt that absconding could be reduced through a number of measures, principally raising staffing levels and reducing the reliance on agency nurses.

Absconding: outcome and risk

Absconding by patients from acute psychiatric wards is known to be linked to self harm and harm to others. Previous research has focused only on officially reported absconds, thus missing out many patients who although they abscond and pose a risk, are never officially processed. This paper reports the findings of a large prospective study of absconding in the East End of London using an objective definition of absconding not linked to official bureaucratic processes. Absconders are considered by staff to be high risk patients, and many have histories of violence and/or suicide attempts. Nevertheless nurses only request the aid of the police in returning patients on 47% of occasions. The actions of the police are very variable, and range from two policemen calling at the patient's house, to an entire team in riot gear appearing at the patient's door in the early hours of the morning. Most absconds result in no harm to anyone, and most absconders return by themselves. Relatives and carers also play a significant role in persuading the patient to return or bringing them back. Nurses should develop more sophisticated ways of working with the police and with relatives to maintain absconding patients' safety.

Absconding: why patients leave

Absconding by patients from acute psychiatric care poses a significant problem to professional staff, and can involve significant risks for patients and others. This paper describes the methodology of a major prospective study of absconding recently completed in the East End of London, and reports the findings on why patients abscond from hospital. Interviews with 52 patients who returned to their wards showed that they abscond because they are bored, frightened of other patients, feel trapped and confined, have household responsibilities they feel they must fulfil, feel cut off from relatives and friends, or are worried about the security of their home and property. Psychiatric symptoms also contribute to the decision to leave, but in nearly every case patients can give additional and rational reasons for their abscond. Some patients leave impulsively and in anger following unwelcome news about delayed permission for leave or discharge. Others leave specifically in order to carry out some activity outside the hospital. In order to reduce absconding and rejection of care, nurses may need to carefully consider the meaning admission has for patients, and the impact it can have upon their everyday lives.

Subunit principles in midface fractures: the importance of sagittal buttresses, soft-tissue reductions, and sequencing treatment of segmental fractures

The patterns of midface fractures were related to postoperative computed tomography scans and clinical results to assess the value of ordering fracture assembly in success of treatment methods. A total of 550 midface fractures were studied for their midface components and the presence of fractures in the adjacent frontal bone or mandible. Preoperative and postoperative computed tomography scans were analyzed to generate recommendations regarding exposure and postoperative stability related to fracture pattern and treatment sequence, both within the midface alone and when combined with frontal bone and mandibular fractures. Large segment (Le Fort I, II, and III) fractures were seen in 68 patients (12 percent); more comminuted midface fracture combinations were seen in 93 patients (17 percent). Midface and mandibular fractures were seen in 166 patients (30 percent). Midface, mandible, and nasoethmoid fractures were seen in 38 patients (7 percent). Frontal bone and midface fractures were seen in 131 patients (24 percent). Split-palate fractures accompanied 8 percent of midface fractures. Frontal bone, midface, and mandibular fractures were seen in 54 patients (10 percent). The midface, because of weak bone structure and comminuted fracture pattern, must therefore be considered a dependent, less stable structure. Its injuries more commonly occur with fractures of the frontal bone or mandible (two-thirds of cases) and, more often than not (>60 percent), are comminuted. Comminuted and pan-facial (multiple area) fractures deserve individualized consideration regarding the length of intermaxillary immobilization. Examples of common errors are described from this patient experience.

Nutrition support programs for young adult athletes

After graduating from college and entering the work force, young adult athletes often struggle with the task of fueling themselves optimally for top performance and weight control. The stresses and time constraints of work, family, and social responsibilities often result in eating fast foods on the run. These young adults can benefit from nutrition education programs in the worksite, at health clubs, in the community, and via the media. Dietitians who specialize in sport nutrition have particular appeal to these athletes, who are struggling to each well, exercise well, and stay lean yet put little time or effort into their food program. This article includes two case studies of young adults and the dietary recommendations that taught them how to make wise food choices, fuel themselves well for high energy, and control their weight.

Chondrosarcoma of the aorta: a rare source of bowel and lower extremity emboli

Malignant aortic tumors occur infrequently. At least 70 cases of primary aortic malignancies have been reported in the literature. Within this group, chondrosarcoma is exceedingly rare, with only 1 case having been reported. An aortic chondrosarcoma developed in our patient and embolized to the small bowel and lower extremities. Although initially thought to arise from the abdominal aorta, this tumor, in fact, originated from the thoracic aorta. This case illustrates the need for complete aortic imaging when unexplained recurrent embolization occurs. In general, the survival rates with chondrosarcoma are diminished, but this patient survived 69 months after he was initially seen.

Abdominal aortic aneurysm in a young child: a 25-year follow-up study

Although abdominal aortic aneurysm (AAA) is a common problem in elderly patients, AAA is rare in children. Despite its rarity, early diagnosis is imperative to prevent limb-threatening or fatal complications. The treatment may be complicated, because it must allow for the growth of the child. A saccular AAA in an 11-year-old boy, complicated by three repeated embolizations to the lower extremities and treated by aneurysmorrhaphy 25 years ago, was studied. In addition, the long-term function of a vein interposition graft in the common femoral artery was identified.

Absconding: a literature review

Incidents of absconding from inpatient care are high-risk events which have been linked to serious harm to self and others. This paper brings together for the first time findings from a disparate body of research literature spanning many years. Varied definitions of absconding and methods of calculating the rates of absconding make comparisons between studies difficult. Nevertheless, it is clear that absconders are more often young, male, from disadvantaged groups, and suffering from schizophrenia, compared to admissions generally. Roughly half of the abscondings take place while the patient is temporarily off the ward with permission, the remainder of absconding patients use an assortment of means to make their escape. A large variety of reasons for absconding have been elicited from patients or advanced as possibilities by researchers. Only six evaluative studies of interventions impacting upon absconding have been reported in the literature, but no firm conclusions can be drawn from them.

Eating before competing

Many casual exercisers and competitive athletes believe they should avoid food for several hours before they exercise or compete. Others wonder if they should snack, perhaps on an energy bar before a soccer game. And a few are so nervous that even the thought of food is nauseating.

New reference reagent for the quality assurance of anti-D antibody detection

A UK BTS-NIBSC freeze-dried anti-D preparation has been prepared and used to monitor the performance of routine antibody detection tests and of the test operators. With the day-to-day use of this preparation, adverse changes in test performance and in test operator may be detected and appropriate action taken before the effect becomes significant. Two dilutions of this preparation have been defined, one which should be detected unequivocally in every test; the other, more dilute, may not be detected in every test but is used to monitor changes in performance. Experience with the use of this preparation is reported from three test centres undertaking routine antibody detection tests. By monitoring results over a series of working days, significant differences were noted in operator performance within one test centre, as was a reduced sensitivity of a given test system within one test centre compared with the same system in the other test centres. These differences were detected only by monitoring the results obtained with this preparation.

How do eggs pan out?

Once upon a time, eggs were considered a "breakfast of champions." Just about every active, hard-working person enjoyed them fried, scrambled, poached, or even raw in eggnog and protein drinks. Then, Americans became cholesterol-conscious and began to substitute bagels, cereal, and other high-carbohydrate, low-cholesterol breakfast foods.

Jumping for soy

Years ago, folks had little good to say about soy foods. Tofu, which is made from soy, was maligned as a food for "nutty" vegetarians. Textured vegetable protein, a soy-based meat extender, was called "mystery meat." Today, however, people are jumping for soy as the benefits of soy foods are recognized. Here is information to help you understand the health and nutritional power of soy, along with tips to help you add more soy to your diet.

Computer simulated cost effectiveness of care management strategies on reduction of long-term sequelae in patients with non-insulin dependent diabetes mellitus

Systems dynamics and computer "microworlds" offer a window on the long-term benefit of investing in aggressive care management for patients with non-insulin dependent diabetes mellitus. This article describes how clinicians, planners, payment specialists, and patients collaborated to make the business case for aggressive management of this disease.

Palatal fractures: classification, patterns, and treatment with rigid internal fixation

A classification of palatal fracture types is developed from patterns observed on CT scans, and success with open reduction techniques is correlated with fracture pattern. The six palatal fracture types are as follows: I, anterior and posterolateral alveolar; II, sagittal; III, parasagittal; IV, para-alveolar; V, complex; and VI, transverse. Associated fractures were LeFort I (100 percent), LeFort II and III (55 percent), mandible (48 percent), and dental (55 percent). Large segment, sagittally oriented palatal fractures could be stabilized with rigid internal fixation. Complete rigid fixation of the palate consists of (1) roof of mouth, (2) pyriform or alveolar, and (3) four LeFort I buttress stabilization. Comminuted palatal fractures were managed by standard LeFort I and alveolar buttress fixation, palatal splinting, and intermaxillary, fixation. If complete rigid fixation was employed in the palate in type II, III, and IV fractures, a palatal splint was avoided in 60 percent of these cases. Rigid internal fixation is therefore concluded to facilitate the treatment of certain types of palatal fractures by reduced length of intermaxillary fixation and avoidance of palatal splinting.

A nutritious new year: resolutions from a to z

The arrival of every new year prompts many of us to resolve to eat more wisely. These healthful eating tips can help you feel great, perform well, and invest in your well-being for many new years to come.

Detection of vancomycin-resistant enterococci in fecal samples by PCR

Surveillance cultures for vancomycin-resistant enterococci (VRE) are time-consuming and expensive for the laboratory to perform. Therefore, we investigated the use of PCR as an alternative method of detecting and identifying VRE directly in fecal samples. PCR primers directed to vanA, vanB, vanC1, vanC2, and enterococcal ligase genes were used to detect and identify VRE in fecal material obtained by rectal or perirectal swabbing. Although PCR-inhibitory substances were present in DNA prepared directly from the swabs, the inhibitory substances could be reduced by processing the nucleic acid with two commercially available DNA preparation columns. Fecal material from 333 swabs was cultured on several selective agar media before and after broth enrichment. DNA was extracted from the fecal material and was analyzed by PCR. By using all four primer sets, only 59 (67.8%) of the samples were positive for vanA. However, after retesting the negative samples with only the vanA primer set, 77 (88.5%) of 87 specimens that were culture positive for Enterococcus faecium containing vanA were positive by PCR. One specimen was PCR positive for the vanA gene but culture negative for enterococci. The specificity of the vanA assay was 99.6%. PCR analysis of enrichment broth samples with all four primers sets after 15 to 18 h of incubation detected 74 (85.1%) of the 87 culture-positive specimens. The specificity of the vanA assay after the enrichment step was 100%. No vanB-containing enterococci were recovered by culture. Since 16 samples can be tested by PCR in 4 h (including electrophoresis), identification of VRE is possible within 8 h of specimen submission at a cost of approximately $10.12/assay. Thus, PCR may be a cost-effective alternative to culture for surveillance of VRE in some hospitals.

The edentulous Le Fort fracture

A retrospective review of 328 Le Fort fractures has identified 20 (6.1%) of these fractures as edentulous. A review of treatment of the patients was conducted. Conservative (nonsurgical treatment methods) and classic open reductions produce aesthetic and functional results that lead to posterior and oblique positioning of the maxillary occlusal segment in comminuted fractures. Attention to positioning the maxilla by relating it to the mandible through maxillomandibular fixation minimized these deformities. Establishing maxillary-mandibular relationships in edentulous fractures, therefore, seems to have the same importance as establishing occlusion in dentulous patients as an important initial step in the treatment of comminuted Le Fort fractures.