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Biomedical subjects

T G Wang

Publications and source records attributed to T G Wang.

41 records · Page 3Linked to original sources
PubMed1983

Time estimation of a secondary event.

This study explored time estimation for a secondary event while the subjects were attentively engaged in a primary one. It also examined whether the perception of time is hemispherically lateralized as estimated by the dichotic listening technique. A tone of 500 Hz was delivered to either ear equally often while the subject was shadowing a recorded passage also presented to either ear. At the end of the tone, the subject estimated the tone's duration. There were three levels of shadowing demands, i.e., control, slow and fast, and four tonal durations, i.e., 6, 14, 27, 63 sec. Subjects tended to underestimate more the tonal duration when the primary task, i.e., shadowing the passage, was more demanding. No clearcut indication of hemispheric lateralization of temporal duration was found.

Adult↗
PubMedDate not supplied

Sonography of pigmented villonodular synovitis in the ankle joint.

Pigmented villonodular synovitis is a benign proliferative disorder of the synovium that results in villous nodule formation in joints, tendon sheaths, and bursae. We present a case of pigmented villonodular synovitis of the ankle joint that was diagnosed by sonography with color Doppler imaging. The sonograms revealed hypoechoic synovial proliferation, and hypervascularity was visible on color Doppler images. The differential diagnosis of a synovial thickening or mass is also discussed.

Adult↗
PubMedDate not supplied

A two-step process for controlling the surface smoothness of polyelectrolyte-based microcapsules.

Biocompatibility is one of the crucial requirements to be fulfilled when designing devices for immunoisolation of transplanted cells. The quality of the capsule surface (smoothness/roughness) influences the nature of cell overgrowth on it by immunocytes, which eventually may lead to the transplant failure. A microcapsule has been developed based on the polyelectrolyte complexation of the polyanions sodium alginate and cellulose sulphate with the polycation poly(methylene-co-guanidine), which was successfully tested in rodent animal models. Recently, the principles for controlling the surface smoothness of these capsules has been identified. This paper reports on a two-step process used for production of stable capsules with improved surface properties. The methodology involves separating the process of drop shape recovery and precursor capsule formation from the process of membrane formation by applying a two-reactor design. The multi-loop reactors are connected in series, and the process separation is given by the different composition of cation solutions flowing in each reactor. This process enables one to prepare the microcapsule immunoisolation device, which can differ in the extent of surface roughness and, thus, is suitable for studying the effect of surface morphology of the immunoisolation device on cell overgrowth. The effect of this process on the capsule permeability has also been evaluated.

Alginates↗
PubMedDate not supplied

Dysphagia in patients with brainstem stroke: incidence and outcome.

OBJECTIVE: This study was conducted to delineate the incidence and outcome of dysphagia among hospitalized patients who were referred for rehabilitation because of brainstem stroke. DESIGN: We retrospectively reviewed the medical records of 36 patients who were admitted because of brainstem stroke. Information on the patients' clinical features, feeding status, and the results of clinical and videofluoroscopic swallowing examinations were obtained through chart review. Follow-up interviews were conducted via telephone to learn the general medical condition and feeding status of the patients 7-43 mo after hospital discharge. RESULTS: A total of 81% of the patients had dysphagia at the time of initial clinical swallowing evaluation, which was performed 10-75 days after the onset of stroke. A total of 79% of the dysphagic individuals depended on tube feeding at the initial evaluation; 22% of all individuals could not resume oral intake at discharge. Statistical analyses revealed a significant association between poor outcome and disease involving the medulla, the presence of a wet voice during the initial swallowing test, and a delay or absence of the swallowing reflex. The incidence of aspiration pneumonia was 11%. There was a correlation between the detection of aspiration by modified barium meal videofluoroscopy and the development of aspiration pneumonia. Follow-up interviews showed that 88% of the 27 patients who were contacted had resumed full oral intake 4 mo after the onset of stroke. CONCLUSIONS: The incidence of dysphagia was relatively high in our study population. The long-term outcome was favorable.

Adult↗