A study of the Nematode parasites of cockroaches in Singapore.
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Insecta↗
Biomedical subjects
L Leong
Publications and source records attributed to L Leong.
Transperineal versus transvaginal color Doppler imaging of the uterine circulation.
Transperineal sonography has been described as being useful in assessing patients in special clinical situations such as posterior placenta previa, preterm labor, stress incontinence, and vaginal atresia. We explored the feasibility of this approach in assessing the uterine circulation in 54 subjects, of whom 36 were postmenopausal. We found that visualization of the uterine artery by the transperineal approach was satisfactory in most patients. The uterine arterial Doppler indices obtained from this approach were compared with those obtained by the transvaginal route. Highly significant correlations were found (correlation coefficient tau for pulsatility index = 0.74, p < 0.0001). No significant differences in results between the two approaches were detected using the Wilcoxon Matched-Pairs Signed-Rank test. We conclude that transperineal Doppler studies of the uterine circulation are possible and may be useful in certain patient groups.
Adult↗
Perceptual impairment after stroke: improvements during the first 3 months.
The aim of the study was to assess changes in perceptual abilities during the first 3 months after stroke using a prospective observational design. The sample was from a hospital with a catchment population of 205,000. Seventy persons aged 60+ admitted with non-lacunar stroke were given the Rivermead Perceptual Assessment Battery, 2 weeks after stroke. Three months post-stroke subjects were reassessed on subtests they had initially failed. The improvements in performance on all 16 subtests of the RPAB were significant, and large in relationship to the maximal possible improvement had all subjects achieved perfect scores on follow-up. Performance on line bisection and line cancellation also improved significantly. In spite of these improvements 64% of subjects still had perceptual impairment as defined by an RPAB score of 0-12 at 3 months post-stroke. It is concluded that perceptual abilities improved greatly during the first 3 months after non-lacunar stroke but nevertheless perceptual impairments remain common at 3-month follow-up.
Aged↗
Nasopharyngeal carcinoma: CT evaluation of patterns of tumor spread.
In a prospective study using CT as the initial means of radiologic evaluation in 262 patients with proved nasopharyngeal carcinoma, the paranasopharyngeal space was found to be the most commonly involved region (84.4%), both uni- and bilaterally. Unilateral involvement was found in 44.3% of patients (116/262) and bilateral involvement in 40.1% (105/262). The other structures or regions that were involved, in decreasing order of frequency, were the sphenoid sinus (26.7%), nasal fossa (21.8%), and ethmoid sinus (18.3%). Erosion of the base of the skull and intracranial intracranial extension into the middle cranial fossa were common (31.3% and 12.2%, respectively). The primary tumor in the nasopharynx was found to be contiguous with metastatic upper cervical nodes through paranasopharyngeal extension of tumor in 35 patients (13.4%). A qualitative method to assess the degree of paranasopharyngeal extension is proposed. The extent of paranasopharyngeal extension so evaluated was correlated with other attributes of tumor extent (p = .0001), namely, nasal or oropharyngeal extension, which constitutes a T3-level tumor, and erosion of the base of the skull or orbit, which constitutes a T4-level tumor. The extent of paranasopharyngeal extension was also correlated with local control of the tumors (p = .0001). At a median follow-up of 27 months, only three (7.9%) of the 38 patients with no paranasopharyngeal extension had nasopharyngeal relapse, while 12 (11.2%) of the 107 and 17 (34.7%) of the 49 patients with types 1 and 2 paranasopharyngeal extension, respectively, had nasopharyngeal relapse.(ABSTRACT TRUNCATED AT 250 WORDS)
Humans↗