Mental health in Latin America and the Caribbean.

Mental illnesses are a growing health problem and reducing the treatment gap in Latin America and the Caribbean is a great challenge. Evaluations conducted by the Pan American Health Organization (PAHO) and World Health Organization (WHO) have shown that the responsiveness of health services is still limited. Nonetheless, from an evaluation of how mental health reform has progressed in the region following the historical benchmark of the Caracas Declaration (1990), it is clear that - despite the limitations, shortcomings and challenges - significant progress has been made in most countries. This paper briefly reviews this progress.

Mental health care systems in Latin America and the Caribbean.

This paper summarizes a series of events that were historical milestones in Latin America and the Caribbean in the long road toward restructuring and setting up psychiatric and mental health services to shift from the old and obsolete psychiatric hospital models to other, community-based models. This has been and largely remains the principal challenge that we face. The burden of mental illness is described in terms of morbidity, mortality, and disability. In 1990, it was estimated that psychiatric and neurological disorders accounted for 8.8% of the disability-adjusted life years in Latin America and the Caribbean; in 2004 that burden had grown to 21%. However, the treatment gap (sick people who remain untreated) exceeds 60%; added to that there is a prevailing gap in funding and resources for the treatment of mental health problems. In response to these problems, the Pan American Health Organization (PAHO/WHO) has continued to strengthen its technical cooperation with the countries. The 49th Directing Council of PAHO/WHO approved the Strategy and Plan of Action on Mental Health for the region of the Americas, which constitutes a major historical landmark; for the first time, the ministries of health in every country in the hemisphere studied and approved a work programme to improve mental health care based on the experiences gained and expressing a technical and political commitment. It is a key priority to continue working to restructure mental health services and strengthen intersectoral initiatives to promote mental health; specific problems, such as care for vulnerable groups, child and adolescent mental health, suicide, alcohol abuse, and violence, also pose a great challenge for mental health programs today.

Totally implantable active middle ear implants: ten years' experience at the University of Tübingen.

Active middle ear implants do not produce acoustic sounds but, rather, micromechanical vibrations. The stimulating signal does not leave the transducer as sound, but as a mechanical vibration, directly coupled to the auditory system and bypassing the normal route via air. In this paper, we review our experience with the TICA and the Carina middle ear implants. Both are totally implantable and are coupled to the ossicular chain or to perilymph. The design requirements for electronic hearing implants for patients with conductive hearing loss differ from those for sensorineural hearing loss. Conductive hearing loss requires an implant that replaces impedance transformation and acts as an impedance transforming implant (ITI). In many respects, there are fewer demands on an ITI than on an electronic hearing aid for patients with sensorineural hearing loss.

Salud Mental en la Comunidad, segunda edición

[Prólogo]. Los trastornos mentales constituyen un creciente problema de salud en el mundo y en especial en el continente americano. Sin embargo, a pesar del significado y la magnitud de la carga de los trastornos mentales resulta indudable que el desarrollo de la atención de salud mental en América Latina y el Caribe ha tenido que enfrentar diferentes limitaciones y dificultades. La Conferencia sobre la Reestructuración de la Atención Psiquiátrica en América Latina celebrada en Caracas, Venezuela en noviembre de 1990 y auspiciada por la Organización Panamericana de la Salud (OPS) marcó un hito histórico en el camino de la reforma y modernización de los servicios de salud mental en la Región. La Declaración de Caracas enfatizó que la atención centrada en el hospital psiquiátrico debía ser sustituida por un modelo de base comunitaria, descentralizado, participativo e integral...

Use of mental health services among disaster survivors.

PURPOSE OF REVIEW: A sizable proportion of individuals following a disaster develop mental health problems. The consequences of these disorders can be long lasting. Only recently has research focused on mental health service delivery following disasters. This review examines the rates, predictors, and barriers to mental health service utilization following a disaster. RECENT FINDINGS: Most of the data on mental health service delivery come from three sources: a fireworks disaster in The Netherlands, the September 11, 2001, attack on New York City, and hurricane Katrina. Most survivors of disasters are reluctant to utilize mental health services and face barriers to accessing care. Even among disaster victims who are severely mentally ill, only a minority receive treatment. Among those who do receive assistance, more than half drop out shortly thereafter. Mental health service utilization following a disaster is influenced by a set of predisposing characteristics, enabling resources, and perceived need. The model for mental healthcare delivery following a disaster that has gained acceptance is Psychological First Aid. SUMMARY: Research is evolving on mental health service utilization. It is limited however to developed countries, although most disasters occur in developing countries. More research is needed, particularly among populations with scarce resources.

Acoustomechanical properties of open TTP titanium middle ear prostheses.

OBJECTIVE: The purpose of the study was to identify acoustcomechanical properties of various biostable and biocompatible materials to create a middle ear prosthesis with the following properties: (i) improved handling including a good view of the head of the stapes or footplate and adjustable length, (ii) improved acoustical characteristics that are adequate for ossiculoplastic. The identified material should serve to build CE and FDA approved prostheses for clinical use in patients. METHODS: Test models made of Teflon, polyetheretherketone, polyethylenterephtalate, polysulfone, gold, Al2O3 ceramics, carbon and titanium were investigated for their potential to fulfill the requirements. Acoustical properties were investigated by laser Doppler velocimetry (LDV) in mechanical middle ear models (MMM). Measured data were fed in to a recently created computer model of the middle ear (multibody systems approach, MBS). Using computer-aided design (CAD) measured and computed data allowed creation and fine precision of titanium prostheses (Tübingen Titanium Protheses, TTP). Their handling was tested in temporal bones. Acoustomechanical properties were investigated using the MBS and mechanical middle ear models. MAIN OUTCOME MEASURES: Input impedance, mass, stiffness, and geometry of test models and prostheses were determined. Furthermore, their influence on the intraprosthetic transfer functions and on coupling to either tympanic membrane or stapes was investigated. RESULTS: Final results were FDA- and CE-approved filigreed titanium prostheses with an open head that fulfilled the four requirements detailed above. The prostheses (TTP) were developed in defined lengths of between 1.75 and 3.5 mm (partial) and 3.0 and 6.5 mm (total) as well as in adjustable lengths (TTP-Vario). CONCLUSIONS: The results suggest acoustomechanical advantages of TTPs because they combine a significantly low mass with high stiffness. In contrast to closed prostheses, the open head and filigreed design allow an excellent view of the prosthesis foot during coupling to the head or footplate of stapes, contributing to an improved intraoperative reliability of prosthesis coupling.

Dynamics of middle ear prostheses - simulations and measurements.

The efficient and systematic development of a middle ear prosthesis necessitates the use of computer models for the prosthesis itself and the reconstructed middle ear. The structure and parameters of the computer model have to be verified by specific measurements of the implant and the reconstructed ear. To obtain a realistic model of a reconstructed ear, three steps of modeling and measurements have been carried out. To get a first approach of the coupling elements a mechanical test rig representing a simplified reconstructed middle ear was built. The velocity of the stapedial footplate was measured with a laser Doppler vibrometer. The corresponding computer model was formulated, and the respective parameters were determined using the measured dynamical transfer functions. In the second step, a prosthesis was implanted into a human temporal bone without inner ear. Exciting this system with noise, the velocity of the stapes footplate was measured with the laser Doppler vibrometer. Based on the multibody system approach, a mechanical computer model was generated to describe the spatial motions of the reconstructed ossicular chain. Varying some significant parameters, simulations have been carried out. To describe the dynamical behavior of the system consisting of middle and inner ear, the computer model used in the second step has been enlarged by adding a simplified structure of the inner ear. The results were compared with in situ measurements taken from living humans.

[Laser vibrometry. A middle ear and cochlear analyzer for noninvasive studies of middle and inner ear function disorders]. / Laservibrometrie. Ein Mittelohr- und Kochleaanalysator zur nicht-invasiven Untersuchung von Mittel- und Innenohrfunktionsstörungen.

A complete battery of audiometric methods is required for the differential diagnosis of different hearing disabilities (including puretone audiometry, impedance, stapes reflex, speech audiometry, brainstam evoked response audiometry, otoacoustic emissions, etc.). In many cases, a comprehensive diagnosis is not possible. Here we describe a new technique based on a laser-Doppler vibrometer that has the potential for non-invasive diagnosis not only middle ear disease but also cochlear pathologies. Disturbance of cochlear function can be ascertained because the input impedance of the cochlea acts as a mechanical load on the middle ear and therefore influences motion of the umbo. In the present study vibration of the umbo and eardrum were measured with a commercially available laser-Doppler vibrometer coupled directly into a standard surgical microscope. The use of the microscope allowed non-invasive measurements of vibrations without having to introduce reflecting material onto the tympanic membrane. Sound pressure was measured with a calibrated probe microphone placed near the tympanic membrane. The displacement response and the specific acoustic impedance of the umbo were calculated from the velocity and sound pressure measured. For normal hearing subjects, the amplitude of the umbo's displacement for frequencies from 0.1 kHz to 1 kHz was 1 nm at 60 dB SPL and decreased with a slope of 6 dB/octave for frequencies between 1 and 5 kHz. A strong correlation was found between the specific acoustic impedance of the umbo and hearing thresholds for hearing-impaired subjects (having otosclerosis or sensorineural hearing losses). The frequency response of the umbo proved to be a means for evaluating the function of both the middle ear and the cochlea under pathological conditions. The measurement technique described is also suitable for intraoperative investigation of the frequency response of the opened middle ear, as well as for the in situ frequency response of partial and total ossicular replacement prostheses.