Dismantling cognitive-behavioral treatment for panic disorder: questioning the utility of breathing retraining

Cognitive-behavioral treatment (CBT) protocols for panic disorder (PD) consist of a set of interventions that often includes some form of breathing retraining (BR). A controlled outcome study was designed to assess the necessity of BR in the context of a multicomponent CBT protocol. To accomplish this, patients with PD (N = 77) were randomly assigned to receive CBT with or without BR or to a delayed-treatment control. The main study hypothesis was that patients receiving BR would display a less complete recovery relative to the other active-treatment condition given that BR appears to be a more attractive (but less adaptive) option for some patients. Some data suggested that the addition of BR yielded a poorer outcome. However, findings were generally more consistent with treatment equivalence, questioning whether BR produces any incremental benefits in the context of other CBT interventions for PD.

Case of enantiomer impurity identification by normal-phase chiral high-performance liquid chromatography with optical rotation and mass spectrometric detection

An impurity produced in the synthesis of compound I is separated and identified as its enantiomer II using normal-phase chiral high-performance liquid chromatography (HPLC) with UV absorbance, optical rotation (OR) and mass spectrometric (MS) detection. The results show that the impurity II and compound I have equal and opposite specific rotations, identical MS spectra and the same MS-MS fragmentation pattern, as required for enantiomers. The procedures presented demonstrate a novel combination of methods for enantiomer identification and characterization that do not require the preparation of individual enantiomer markers or even the racemic mixture, thus reducing the need for additional synthetic work.

Impact of population pharmacokinetic-pharmacodynamic analyses on the drug development process: experience at Parke-Davis

BACKGROUND

Continued scepticism about the benefits of population pharmacokinetics and/or population pharmacodynamics, here referred to collectively as the population approach, hampers its widespread application in drug development. At the same time the sources of this scepticism have not been clearly defined. In an attempt to capture and clearly define these concerns and to help communicate the value of the population approach in drug development at Parke-Davis we conducted a survey of customers within the company. The results of this survey are presented here.

METHODS

All drug development programmes conducted over the past 10 years that included a population approach in data analysis and interpretation were identified. A brief description of the population analysis was prepared together with a brief description of how the resulting information was used in each drug development programme. These synopses were forwarded to relevant members of each drug development team together with a survey designed to solicit opinions as to the relevance and impact of these analyses.

RESULTS

The most frequent use of information derived from population-based analysis was in labelling. In all cases of drugs making to New Drug Application (NDA) submission the analyses resulted in information that was included in approved or proposed labelling. In almost half of the cases summarised here (5 of 12), population-based analysis was perceived to have resulted in information that influenced the direction of individual development programmes. In many of these cases the information was serendipitous. It is also noted that most of these analyses were not the result of clearly defined objectives and prospective analysis plans.

CONCLUSIONS

Use of the population approach, even when applied retrospectively, may have value in complementing or supporting interpretation of other data collected during the course of a trial. Atypical systemic exposure is quickly and easily assessed for correlation with adverse events or exceptional efficacy in retrospective or ad hoc evaluation. Although we know of no direct evidence, it is possible that such use of population pharmacokinetic data has facilitated NDA review and approval by providing insight into the role of atypical systemic drug exposure in otherwise spurious events.

Issues in the delivery of dermatologic surgery for skin cancer

Significant financial resources need to be dedicated to treating the large numbers of skin cancers in the United States. The goal of the surgical treatment of skin cancer is to provide a high cure rate in a manner that is minimally morbid, convenient, and inherently of high value. Cost-effective delivery of this skin cancer care is critical given the prevalence of cutaneous neoplasia. Dermatologists are the best-trained physicians in the identification and management of melanoma and NMSCs. They are the most highly skilled judges of when intervention is indicated, of which lesions warrant biopsy, and of which treatment techniques are applicable for each individual tumor. These skills take years to develop and are necessary to provide the highest standard of medical and surgical management of skin cancer. As dermatologic surgery continues to evolve and dermatologists in residency receive even more surgical training, the dermatologist will prove to be the surgical skin cancer specialist well into the new millennium.

Three-dimensional whole body imaging of spin probes in mice by time-domain radiofrequency electron paramagnetic resonance

Imaging of stable paramagnetic spin probes in phantom objects and in vivo was evaluated using a RF time domain EPR spectrometer/imager operating at 300 MHz. Projections were collected using static magnetic field gradients and images were reconstructed using filtered back-projection techniques. Results from phantom objects containing approximately 10(17) spins of stable paramagnetic probes with single narrow EPR spectra provide three-dimensional spatial images with resolution better than 2 mm. When the spin probe was administered to mice, the spin probe accumulation was temporally observed in the thoracic, abdominal, and pelvic regions. A three-dimensional image (from 144 projections) from a live mouse was collected in 5 min. Using fiducial markers, the spin probe accumulation in organs such as liver, kidney, and bladder could be observed. Differences in the oxygen status between liver and kidney were observed from the EPR images from mice administered with spin probe, by treating the time-domain responses with convolution difference approach, prior to image reconstruction. The results from these studies suggest that, with the use of stable paramagnetic spin probes and time-domain RF EPR, it is possible to perform in vivo imaging on animals and also obtain important spatially resolved physiologic information.

Sternal instability after midline sternotomy

The purpose of this paper is to discuss sternal instability a problem occasionally associated with midline sternotomy, including the etiology, predisposing conditions, diagnosis and management. Among the methods of repair, sternal weaving and pectoralis muscle advancement are thought to be especially effective.

Videoconferencing: what are the benefits for dental practice?

For more than 3 years members of the TeleDent team from Bristol University have been looking at the potential of videoconferencing technology for dentistry. Here they explain what videoconferencing is and how it can help the GDP. They discuss examples of its most promising uses for the profession, which include professional updating and providing diagnostic support at a distance. They describe the equipment that is needed, the different types of system available and give an indication of costs. A suggested procedure for using the technology for remote referrals is outlined. 'Store and forward' techniques are also discussed. These do not involve a live video but involve the sending of static electronic files. This approach is compared with videoconferencing, and the article looks at the question of which will be best suited to the GDP, and for what purposes.

Multiresidue analysis of pesticides in fresh fruits and vegetables using procedures developed by the Florida Department of Agriculture and Consumer Services

Improved quality and efficiency of pesticide residue analysis were achieved by examining all aspects of the laboratory process. In an effort to eliminate methylene chloride hazardous waste, an acetonitrile extraction method, originally developed by the California Department of Agriculture, was modified and adopted. Sample size and solvent consumption were reduced with the new method. Custom glassware racks and disposable supplies reduced overall analysis time. Gravity-fed, solid-phase extraction simplified sample preparation and provided cleaner extracts for gas chromatographic analyses. Modifications to the method were made to achieve the ruggedness needed to maintain quality objectives during routine analysis. Instrumental improvements, including new selective detectors, retention time locking, and mass spectrometry screening for all samples, provided the laboratory with efficient, reliable, and confirmed analytical results.

[An epidemiological study of consultations of children under 5 years of age in Brazzaville (Congo)]

In most of the large cities in developing countries, geographic accessibility to health care is not a major problem. Thus, indifference to public services and a preference for home treatment, recourse to traditional medicine or to the private sector may be related to problems in the quality of services. A cross-sectional epidemiological study of hospital visits by under-5 children was carried out in health centres and hospital out-patient services in Brazzaville (Congo). Sampling in these health facilities was done using a systematic random sample with a proportion of 25%, during 4 periods chosen according to seasonal factors. An exhaustive investigation of the entire public sector serving children was done in the study. At the same time, the same data were gathered in a sample of private facilities (doctors' and nurses' offices, traditional healers, religious healing centres), chosen as a function of their permanence and the numbers of their clientele. This article analyses services offered during 2215 visits by children, who were under 1 year of age in more than 50% of cases. In the public sector, 75% of visits were to first-line health centres. Public services show marked dysfunctions: the complexity of internal referrals, clinical examinations which are inadequate in relation to symptoms, and poor communication (explanations as to cause of illness in less than 2% of cases, and on treatments in less than 50% of cases). Communication seems well developed among private physicians and traditional healers, the latter engaging in both preventive and curative activities. Communication during well-child visits and consultations at health centres is especially disappointing, in light of the very young age of the parents (1/4 are high-school or college students). There is a two-fold risk in this situation: flight towards non-conventional medicine on the one hand, and access to private medicine based on socio-economic status on the other. It thus appears necessary to standardise procedures and acts in first line public health services and to promote training of personnel in communication skills with families (training using social science perspectives and participative pedagogical techniques).

[Natural histories of disease: a pragmatic approach to multidisciplinary research on health care seeking behavior and therapeutic itineraries]

Public health is determined by the interaction of social, cultural and biological factors. Because of this complexity, a multidisciplinary approach is needed when doing research on public health problems. Medical anthropology and epidemiology share a common interest for human behavior and health, so it is especially appropriate for these two disciplines to work together in studying health seeking behavior and the use of health systems. In order to better understand social and cultural factors associated with health seeking behavior, a suitable qualitative research method was needed for use in association with a medical and epidemiological approach in the research program "Use and perception of health systems by children and their family", carried out in Algeria, the Congo (Brazzaville), Morocco, and Togo. Three factors were considered important: coordinating the qualitative and quantitative research methods within a single time frame, involving all members of the multidisciplinary research teams in each country, and producing data accessible and useful to health care professionals and others responsible for health system performance. A case study method based on "natural histories of illness" was adopted, using home interviews of families about a recent illness episode of an under-5 child. There are several advantages to this approach: 1) analysis of illness episodes reveals the totality of the health seeking process, including therapeutic itineraries; 2) families have little difficulty in describing an illness episode in the order events occurred; 3) these accounts are easily understood by health professionals, resembling as they do a "clinical case study" approach; 4) the content is readily available in the form of common discourse for use by health program planners and administrators. The method is thus able to provide information necessary for organizing health services which meet the perceived needs of the population.

[Health care seeking behavior of children in Togo]

Epidemiological and anthropological studies were carried out in Togo on health seeking behavior for under 5 children to determine causes of dysfunctions in health services. This article reports on the main findings of the anthropological study. Anthropological literature on health seeking behavior has identified labeling and associated explanatory models of illness as important factors for making choices in the use of health services. This study, carried out among 100 families in Togo on health seeking behavior for under-five children, found little difference in the signs and symptoms of illness recalled and the health resources used. Different causal explanations similarly showed little variation in signs and symptoms of illness. The only causal explanation for illness which appeared to correspond to place of recourse was related to social causes, where traditional practitioners were more often consulted. Families explained choices more on the basis of the accessibility and quality of health services (geographical and financial accessibility, reception by health personnel, organization of services, drug availability) than on the basis of the particular signs and symptoms of the illness. Improving the organization and functioning of health services should contribute more to appropriate use of the modern health care sector than interventions targeting user populations, since the latter appear to be aware of the advantages of modern medicine, but find financial, social and organizational features of services unsatisfactory.

Global nail dystrophy associated with human papillomavirus type 57 infection

Verrucae vulgares frequently induce nail dystrophy when infection of the nail matrix occurs. Classic periungual warts are easily recognized by the experienced physician. We report a very unusual presentation of human papillomavirus (HPV) infection of the nail matrix and nail bed involving all 20 nails in an otherwise immunocompetent patient. Viral typing by in situ hybridization revealed HPV type 57. To our knowledge, this is the first association between dystrophy of all 20 nails and HPV infection. However, as the ease of HPV typing improves, a variety of previously unrecognized cutaneous lesions is likely to be associated with HPV infection.

[Families and children confronting health care practices in Algeria]

This paper describes results of a study on perceptions and behaviors of families concerning care of sick children, within the context of the Algerian health system as it functioned in two zones, Aïn Taya and Tigzirt, in 1991. One hundred twenty families in the two zones were interviewed at home on the health seeking process during a recent illness episode of an under-5 child. Results show families make extensive use of curative health services for children, with apparently little use of traditional medicine, and only initial use of home remedies. Access to public services is often difficult due to distance, while incompetence, long waiting times, favoritism, lack of material, and poor communication with health personnel constitute families' main complaints. Use of private physicians, in spite of costs, is considered a gain in time, and rapport and communication are better. Results of the research among these families are discussed in relation to those from a study carried out at the same time among health professionals, results which show deep dissatisfaction on their part as to the means put at their disposal and with the quality of relationships maintained with the administration on the one hand, and with the client population on the other. Improving the public health sector in Algeria will entail greater investment in the quality of peripheral services, and training of health personnel in better communication skills.

The nutritional assessment of iron status

In nutritional studies to assess the prevalence of iron deficiency, it has been common practice to define 3 stages of increasing severity: iron storage depletion as defined by low serum ferritin, mild iron deficiency without anemia based on laboratory evidence of iron deficient erythropoiesis (IDE), and overt iron deficiency anemia (IDA). While this approach provides a broad perspective of impaired iron status, the main liabilities of iron lack are associated only with the more advanced stage of IDA. Consequently, the hemoglobin determination can be used to screen for nutritionally significant iron deficiency. Having identified anemia, more specific laboratory studies are needed to establish iron lack as the cause. The traditional measurements of iron deficient erythropoiesis (IDE) such as a low transferrin saturation, elevated erythrocyte protoporphyrin, or decreased mean corpuscular volume are commonly used. The major drawback in using these parameters is that they are affected similarly in individuals with the anemia of chronic disease (ACD), a common form of anemia in low socioeconomic populations. Because iron stores are invariably absent in individuals with uncomplicated IDA, a low serum ferritin concentration below 20 micrograms/L confirms the diagnosis of IDA when anemia is present. The main limitation of the serum ferritin is that it is falsely elevated to within the normal range when IDA develops in individuals with concurrent infection or chronic inflammation. When this occurs in a clinical setting, a bone marrow examination is commonly performed to identify IDA. Recent investigations indicate that this cumbersome procedure can be avoided by measuring an important new iron-related measurement, the serum transferrin receptor (TfR). Because the synthesis of TfR is upregulated with tissue iron deficiency, IDA can be identified readily by an elevated serum TfR. Importantly, the serum TfR is normal in individuals with the ACD but becomes elevated if these individuals develop IDA. The optimal combination of laboratory measurements for detecting IDA is the hemoglobin, serum ferritin and serum TfR.

[Contributions to the sociologic analysis of the impact of sickle cell disease on families from Northern Tunisia]

The improvement of the conditions of care and quality of life of people living with drepanocytosis now constitutes a major concern of health authorities and voluntary groups (associations of sick people and their parents). In order to examine the conditions and methods of care for children living with drepanocytosis in the Bizerte region of Northern Tunisia and to understand the problems and difficulties experienced by them and their families in their daily lives, an anthropological study was carried out in the region between January 16 and February 12, 1997. Thirty-three interviews were carried out with families of infected children. The interviews were semi-directive using a pre-established protocol (interview guide). Thirty interviews were then analysed. A multitude of information concerning various medical and psycho-social aspects of drepanocytosis in the region were revealed. The data were regrouped into the following categories: circumstances of discovering the illness; explicative model of the illness as perceived by the people interviewed; conditions and methods of care of the sick child; degree of satisfaction with the health care system; psychological profile of the children interviewed; educational level of the children interviewed; repercussions the illness has on the family; impact of the illness on household budget; suggestions and comments of the people interviewed. In light of the information collected, various actions have been proposed with the goal of improving the conditions of care and quality of life of people living with drepanocytosis in the region.

Pattern Formation of Scale Cells in Lepidoptera by Differential Origin-dependent Cell Adhesion

We present a model for the formation of parallel rows of scale cells in the developing adult wing of moths and butterflies. Precursors of scale cells differentiate throughout each epithelial monolayer and migrate into rows that are roughly parallel to the body axis. Grafting experiments have revealed what appears to be a gradient of adhesivity along the wing. What is more, cell adhesivity character is maintained after grafting. Thus we suggest that it is a cell's location prior to migration that determines its interactions during migration. We use nonlinear bifurcation analysis to show that differential origin-dependent cell adhesion can result in the stabilization of rows over spots.

Information Technology for postgraduate education: survey of facilities and skills in the South West Deanery

OBJECTIVE

To determine the Information Technology (IT) infrastructure available to, and IT skills of, obstetric specialist registrars across the South West Deanery.

DESIGN

Open prospective study.

SETTING

NHS Hospitals in the South West Deanery.

METHODS

Two separate surveys. Firstly, the computer equipment available to trainees was determined at each hospital in the deanery on site using a software programme. Secondly, IT skills of a sample of 22 specialist registrars were assessed using a checklist at a series of four workshops.

MAIN OUTCOME MEASURES

Computers with sufficient specification to use CD-ROMs, to access the Internet, and to support data-, audio- and video-conferencing. The number of trainees with IT skills to use a computer-aided learning package and the Internet.

RESULTS

Sixty-six percent of trainees have access to a computer with a CD-ROM drive. Sixty-six percent also have access to the Internet at their place of work. Thirteen percent have access to data-conferencing but there were no computers in the Deanery able to support audio- or video-conferencing. Twenty-five percent of trainees have no IT skills and require basic training in the use of computers. Thirty-six percent of our sample would require training to be able to use computer-based tutorials programs. Seventy-seven percent of trainees require training to be able to use the Internet without assistance.

CONCLUSION

A significant minority of trainees do not have access to computers with sufficient specification to run basic tutorial programmes or access the Internet. Similarly, a large minority of trainees do not even have a basic knowledge of computer technology and IT training is required for the majority of trainees for them to reap the potential benefits which computer-based tutorials systems and the Internet can give.

[Maternal mortality and referral maternities in Morocco: how to (re)motivate professionals?]

The very high rates of maternal mortality and perinatal mortality, as well as the deficiencies and dysfunctions observed in maternity hospitals, which play the role of referential maternity wards, led the Moroccan Minister of Public Health to implement a project in order to improve the quality of care of parturient women and new-borns. This project included 8 provinces in the country. The strategy chosen was "the team approach to resolving health problems", which is a learning process which leads local teams to implement and evaluate projects they have developed themselves. This pedagogical approach, which is carried out over a period of more than a year, proved itself to be very motivating and mobilising for the professionals included, despite the obstacles that were encountered. It also contributed to creating a true team spirit. Most activities planned within these projects were carried out and many indicators improved.

Taxanes as radiosensitizers for head and neck cancer

Combinations of paclitaxel and radiation therapy or paclitaxel with other chemotherapy agents and radiation have been tested with variable results in patient populations. To date, three phase I trials have been conducted using paclitaxel alone in combination with radiotherapy for the treatment of patients with head and neck cancer. Dose-limiting toxicity in the 1-hour infusion was mucositis, whereas in the 24-h/wk infusion, fever was the dose-limiting toxicity. In the long-term infusion (24 h/d, 7 d/wk), no dose-limiting toxicity was seen at the doses of paclitaxel given. In two of the protocols in which biopsies were obtained, a G2/M block was observed. A phase I protocol using paclitaxel in combination with fluorouracil and hydroxyurea with radiation and a phase II protocol using paclitaxel with cisplatin in operable head and neck cancers have been reported. Preliminary results suggest that paclitaxel in combination with radiotherapy is a reasonable experimental treatment that deserves further study in patients with stage III and IV squamous cell carcinomas of the head and neck.

Modeling the long-term outcomes and costs of HIV antiretroviral therapy using HIV RNA levels: application to a clinical trial

A model was developed to gain insight into the potential clinical and economic impact of antiretroviral therapy for HIV-infected patients. Observed HIV RNA levels and CD4 cell counts are used in the model to estimate the probability that an individual progresses from asymptomatic infection to the first AIDS-defining illness and death and to estimate the total net cost of care and long-term cost-effectiveness of antiretroviral therapy. The model was applied to patients in a clinical trial (Merck protocol 035) that compared the surrogate marker response to triple therapy with indinavir (IDV; 800 mg every 8 hr) plus zidovudine (ZDV; 200 mg every 8 hr) plus lamivudine (3TC; 150 mg twice a day) to double therapy with ZDV+3TC. The model projected that for an individual without AIDS who received triple therapy the progression to AIDS and death would be delayed more than for a patient who received double therapy with ZDV+3TC if no other treatment options were offered. Because of this delay in disease progression, the total discounted cost over the initial 5-year period was projected to be $5100 lower for patients who received triple therapy compared with double therapy if suppression with triple therapy lasts up to 3 years. If suppression with triple therapy lasts up to 5 years, costs were projected to be higher with the triple combination, but 81% of the cost is offset by lower disease costs as a result of fewer patients progressing to AIDS. Over 20 years, total discounted cost was projected to be higher for the triple-therapy regimen primarily because of a longer estimated survival time. At 20 years, the incremental cost per life-year gained by adding IDV to a ZDV+3TC regimen was estimated at $13,229, which is well within the range of other widely accepted medical interventions.