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New obstacles in the path of marketing new medical devices.

Approval of a new medical device's safety and effectiveness by the Food and Drug Administration (FDA) is only one step in the typical device's passage into the marketplace. A review of 10 new Class II and III devices found an average of 62 months elapsing between the beginning of FDA-approved clinical trials and the device's final approval for general marketing. However, FDA marketing approval does not mean a new device can be sold because, for many new devices, the Health Care Financing Administration (HCFA) requests a technology assessment from the Office of Health Technology Assessment (OHTA) in order to determine whether the device's use is "reasonable and necessary" and thus appropriate for Medicare payment. The Medicare decision often guides other third parties. OHTA assessments of 93 devices and procedures required an average of 26 months to complete; of 16 FDA-approved Class III devices, OHTA reported to HCFA that insufficient data existed to recommend coverage for 12 (75 percent). Under the Medicare prospective payment system (PPS) for hospital care, a third step has been added to the process, consideration by the Prospective Payment Assessment Commission (ProPAC) and HCFA of the new device's impact on PPS payment rates. Further, under recent legislation, OHTA is mandated also to consider a device's cost effectiveness. Duplicative reviews of new devices should be eliminated, and until they are, medical equipment developers must recognize that delays and conflicting payment rulings may have serious impacts on the ability to market a new device.

Centers for Medicare and Medicaid Services, U.S.↗

Immunization practices of pediatricians and family physicians in the United States.

OBJECTIVE: To assess current practices and attitudes among pediatricians and family physicians across the United States regarding immunizations. DESIGN: Survey of a random sample of pediatricians and family physicians. SUBJECTS: Fellows of the American Academy of Pediatrics (N = 746) and American Academy of Family Medicine (N = 429). SURVEY TOPICS: General immunization practices (eg, types of visits during which vaccinations are provided, mechanisms to identify undervaccinated children); and opinions about perceived barriers to immunizations, acceptance of alternative sites for immunizations, and possible immunization requirements for Medicaid and The Special Supplemental Food Program for Women, Infants, and Children (WIC). RESULTS: Pediatricians and family physicians (combined) reported the following: immunizing children during acute illness visits (28%), follow-up visits (90%), and chronic illness visits (77%); using computer or reminder files to identify undervaccinated children (13%); and simultaneously administering four vaccines (diphtheria-tetanus-pertussis, oral poliovaccine, measles, mumps, and rubella and Haemophilus influenzae type b) to an eligible 18-month-old child (66%). Physicians perceived the following as barriers to immunizations: missed preventive visits (40%), vaccine costs (24%), lack of insurance coverage (24%), inability to track undervaccinated patients (22%), incomplete immunization records (12%), and missed vaccination opportunities (12%). Physicians agreed with offering vaccinations during hospitalizations (51%) or emergency department visits (30%), and with immunization requirements for continued eligibility for Medicaid (66%) or WIC (64%). Pediatricians were more likely to vaccinate during chronic illness and follow-up visits, and were more likely to use systems to track undervaccinated children (P < .05); however, most immunization practices and attitudes of pediatricians and family physicians were similar. Physicians who graduated from medical school more recently and those in high-risk urban practices were more likely to vaccinate during acute illness visits, provide simultaneous vaccinations, and favor vaccinations in hospital settings. CONCLUSIONS: Vaccination rates might be improved by closer adherence to current immunization guidelines regarding vaccinations during all encounters and simultaneous vaccinations, by developing systems to identify undervaccinated children, and by reducing patient costs for vaccinations. Current immunization practices fall short of the immunization guidelines; changes in individual practice styles will be required to conform with these standards.

Acute Disease↗

Clonal spread of methicillin-resistant Staphylococcus aureus in a large geographic area of the United States.

Methicillin resistance in Staphylococcus aureus has rapidly increased over the last two decades. This increase is paralleled by the emergence of unique multi-resistant MRSA clones. In Brazil, Argentina, Uruguay, Portugal and Czech Republic a specific MRSA clone is widely spread, the so-called Brazilian epidemic clone. Another epidemic clone, the Iberian clone, is disseminated in Spain, Portugal, Belgium, Scotland, Italy, Germany and New York. Thus, a large number of hospital-acquired infections have been caused by specific MRSA clones. Using different molecular techniques for MRSA typing, we verified that two unique epidemic clones are spread over large geographic area in the US. In addition, we showed that a previously described MRSA clone type, the New York clone (I::A:A), is widely spread beyond the New York frontiers.

Cloning, Molecular↗

Theory of interlayer tunneling in bilayer quantum Hall ferromagnets.

Spielman et al. [Phys. Rev. Lett. 84, 5808 (2000] recently observed a large and sharp Josephson-like zero-bias peak in the tunnel conductance of a bilayer system in a quantum Hall ferromagnet state. We argue that disorder-induced topological defects in the pseudospin order parameter limit the peak size and destroy the predicted Josephson effect. We predict that the peak would be split and shifted by an in-plane magnetic field in a way that maps the dispersion relation of the ferromagnet's Goldstone mode. We also predict resonant structures in the dc I-V characteristic under bias by an ac electric field.

Journal Article↗

National MOTTEP: educating to prevent the need for transplantation. Minority Organ Tissue Transplant Education Program.

The purpose of this study was to determine whether participation in culturally appropriate, community-developed, health education programs addressing organ/tissue donation and preventing the need for transplantation, is an effective strategy for contributing to sustained behavior change among members of minority population groups. Within 15 target cities, 800 (40%) minority participants consented to a 2-3 month telephone follow-up survey. The 5-item questionnaire using items extracted from the pre- and post-survey instrument, addressed: 1) knowledge and beliefs; 2) willingness to sign donor cards and have family discussions; and 3) prevention/health behaviors. The preliminary findings based on telephone interviews with 253 participants indicate the following: [table: see text] The conclusions indicate that the community-based, culturally appropriate health education strategies used contributed to and sustained behavior changes.

Attitude to Health↗

Appetitive conditioning in neonatal rats: conditioned ingestive responding to stimuli paired with oral infusions of milk.

Components of rat pups' ingestive responses to orally infused milk came to be elicited by a novel odor conditioned stimulus (cedar) that had been repeatedly paired with milk infusions (Experiment I). Pups responded specifically to one odor, and they did not generalize their conditioned responding to either another odor or an unscented airstream (Experiment II). Ingestive responses could also be conditioned to a vibrotactile CS paired with milk, although levels of conditioned responding were lower than were obtained with an odor CS (Experiment III). Pups' internal state determined the effectiveness of training, in that pups that were removed from their dam for 24 hr showed reliable conditioned responding, while nondeprived pups and dehydrated pups did not (Experiment IV). Finally, pups showed retention of conditioned responding for at least several days after training (Experiment V).

Animals↗

Luttinger liquid at the edge of undoped graphene in a strong magnetic field.

We demonstrate that an undoped two-dimensional carbon plane (graphene) whose bulk is in the integer quantum Hall regime supports a nonchiral Luttinger liquid at an armchair edge. This behavior arises due to the unusual dispersion of the noninteracting edge states, causing a crossing of bands with different valley and spin indices at the edge. We demonstrate that this stabilizes a domain wall structure with a spontaneously ordered phase degree of freedom. This coherent domain wall supports gapless charged excitations, and has a power law tunneling I-V with a nonintegral exponent. In proximity to a bulk lead, the edge may undergo a quantum phase transition between the Luttinger liquid phase and a metallic state.

Journal Article↗

Evidence of soft-mode quantum phase transitions in electron double layers

Inelastic light scattering by low-energy spin-excitations reveals three distinct configurations of spin of electron double layers in gallium arsenide quantum wells at even-integer quantum Hall states. The transformations among these spin states appear as quantum phase transitions driven by the interplay between Coulomb interactions and Zeeman splittings. One of the transformations correlates with the emergence of a spin-flip intersubband excitation at vanishingly low energy and provides direct evidence of a link between quantum phase transitions and soft collective excitations in a two-dimensional electron system.

Journal Article↗

A biological safety centrifuge.

The Washington State Public Health Laboratories has devised a metho to capture and remove aerosols produced during centrifugation. The method to adapt any centrifuge having an enclosed chamber with an air intake hole in the lid, and an exhaust hole in the bottom of the chamber, is discussed.

Aerosols↗

Aldehyde oxidoreductase activity in Desulfovibrio gigas: in vitro reconstitution of an electron-transfer chain from aldehydes to the production of molecular hydrogen.

The molybdenum [iron-sulfur] protein, first isolated from Desulfovibrio gigas by Moura et al. [Moura, J. J. G., Xavier, A. V., Bruschi, M., Le Gall, J., Hall, D. O., & Cammack, R. (1976) Biochem. Biophys. Res. Commun. 72, 782-789], was later shown to mediate the electronic flow from salicylaldehyde to a suitable electron acceptor, 2,6-dichlorophenolindophenol (DCPIP) [Turner, N., Barata, B., Bray, R. C., Deistung, J., LeGall, J., & Moura, J. J. G. (1987) Biochem. J. 243, 755-761]. The DCPIP-dependent aldehyde oxidoreductase activity was studied in detail using a wide range of aldehydes and analogues. Steady-state kinetic analysis (KM and Vmax) was performed for acetaldehyde, propionaldehyde, benzaldehyde, and salicylaldehyde in excess DCPIP concentration, and a simple Michaelis-Menten model was shown to be applicable as a first kinetic approach. Xanthine, purine, allopurinol, and N1-methylnicotinamide (NMN) could not be utilized as enzyme substrates. DCPIP and ferricyanide were shown to be capable of cycling the electronic flow, whereas other cation and anion dyes [O2 and NAD(P)+] were not active in this process. The enzyme showed an optimal pH activity profile around 7.8. This molybdenum hydroxylase was shown to be part of an electron-transfer chain comprising four different soluble proteins from D. gigas, with a total of 11 discrete redox centers, which is capable of linking the oxidation of aldehydes to the reduction of protons.

Aldehyde Oxidoreductases↗

Modelling and prediction of soil sorption coefficients of non-ionic organic pesticides by molecular descriptors.

Soil sorption coefficients (K(OC)) of 185 non-ionic organic heterogeneous pesticides have been studied searching for quantitative structure-property relationships (QSPRs). The chemical description of pesticide structure has been made in terms of some molecular descriptors: count descriptors, topological indices, information indices, fragment-based descriptors and weighted holistic invariant molecular (WHIM) descriptors; these last are statistical indices describing size, shape, symmetry and atom distribution of molecules in the three-dimensional space. Three new topological indices derived from the electrotopological state indices of Kier and Hall were proposed. Multiple linear regression analysis was performed after previous selection of the descriptors mostly correlated to the response by Genetic Algorithms. The obtained results confirm the capability of the proposed approach to give predictive models for one of the most important partition properties, such as soil sorption coefficient (K(OC)).

Algorithms↗

A Hall effect transducer for measuring length changes in mammalian diaphragm.

When a conductor through which a current is flowing is brought into a magnetic field, the isopotential lines are distorted (E. H. Hall, 1879). When a constant current is made to flow through a Hall generator, the measured voltage perpendicular to the current flow can be made to vary by altering the distance between a permanent magnet and a Hall generator. A length transducer useful for measuring length changes in the diaphragm of a dog is made by connecting a commercially available Hall generator to a Plexiglas plate (5 X 10 X 3 mm, 0.5 g), and suturing the plate to the surface of the muscle. A permanent magnet (20 X 10 X 4 mm, 1.5 g) is attached to the diaphragm at a distance of 2 or 3 cm along the expected direction of length change. Fine wires from the terminals of the Hall generator are connected to an external constant-current source and to solid-state circuitry which provides amplification, linearization, and temperature compensation of the output signal. Model experiments indicate that the length measurements may be accurate within 5% if the distance between the magnet and Hall generator is greater than 5 mm. With this type of transducer measurements of segmental length changes in the diaphragm of an anesthetized dog have been successfully recorded.

Animals↗