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Biomedical subjects

L C Chong

Publications and source records attributed to L C Chong.

8 recordsLinked to original sources
PubMed2001

Neurologic injury after endovascular stent-graft and bilateral internal iliac artery embolization for infrarenal abdominal aortic aneurysm.

The authors report a rare neurologic complication after the implantation of a bifurcated stent-graft for abdominal aortic aneurysm. The stent-graft was extended to both external iliac arteries after embolization of both internal iliac arteries. The patient subsequently had weakness and numbness of both lower limbs with bowel and bladder incontinence. He probably had ischemic injury to the nerve roots or the lumbosacral plexus, which was related to extensive occlusion of their supplying arteries. The mechanism of spinal cord and neurologic ischemia after aortic stent-graft implantation is discussed.

Aged↗
PubMed1993

Screening asymptomatic subjects with subclinical arteriosclerotic lesions with arterial ultrasonic biopsy. The P.A.P. study.

Ultrasound Biopsy is a an effective screening method for detecting early, subclinical arteriosclerotic lesions. Carotid and femoral artery wall lesions are important markers of generalized cardiovascular disease. The evaluation of 4 arterial sites (both carotid and femoral arteries) gives a clue of the status of the whole cardiovascular system. In 27.9% of all patients the femoral lesions are present earlier or in a more advanced stage than carotid lesions. Different age groups have a different UB class distribution and score due to the progression with age of the disease. Early arterial lesions and small plaques are important indicators of silent coronary ischemia and cardiovascular events. The method has also an impact on patients' compliance. Subjects with early plaques shown by high resolution ultrasound are more impressed by this finding than by laboratory results.

Adolescent↗
PubMed1993

Evaluation of arteriosclerosis progression with ultrasonic biopsy and intima-media thickness measurements.

Noninvasive ultrasonic biopsy (UB) can be used to classify arteriosclerotic lesions and their progression in the carotid and femoral bifurcation. Six UB classes have been defined. The rate of progression (ROP) to the next UB class in four years has been defined in 1270 normal subjects: it was 1.4% from class I to class II, 3.1% from II to III, 10.7% from III to IV, 17.9% from IV to V and 79.2% from class V to VI. In high risk subjects (HRS)--305 hyperlipidemics, 269 diabetics and 381 hypertensives--the ROP in 4 years was significantly higher considering all classes. This finding was matched by a more significant increase in intima-media thickness (IMT) increase in HRS in comparison with normal subjects. In conclusion UB and IMT measurements can be used to monitor arteriosclerosis progression. HRS have a comparable increase in ROP and IMT in four years indicating rapid progression in comparison with normals. UB appear to be more effective in evaluating progression when plaques and wall irregularities make IMT measurements difficult.

Adult↗
PubMed1990

Assessment of cardiotocographs.

In recent years advances in medical electronic equipment for monitoring, diagnosis and treatment of patients have led to a large increase in the number and variety of instrumentation available to the medical profession. There is a considerable amount of duplication of equipment and in the absence of readily available information buyers are unlikely to make informed decisions about the ideal instrument for their particular circumstances. One method of increasing the users' awareness is a comparative, independent assessment of equipment, with the results disseminated to the interested parties. This paper describes the essential qualities of cardiotocographs: how they are assessed as part of the UK Department of Health's evaluation programme and the measures to inform users of the latest evaluation information.

Cardiotocography↗
PubMed1987

Seasonal changes in the prevalence of Haemonchus and Trichostrongylus hypobiotic larvae in tracer goats in Malaysia.

An investigation into the seasonal changes in the population structure of Haemonchus and Trichostrongylus in tracer goats was conducted over 12 months at Serdang, an area in southern West Malaysia with year-round tropical rainfall. Successive groups of parasite-free tracer goats were grazed for a month alongside naturally infected adult goats and necropsied for worm counts 14 days after their removal from pasture. No hypobiotic larvae of Trichostrongylus were recovered. Hypobiotic larvae of Haemonchus were evident during each month of the year but accounted for only a very small proportion of the total Haemonchus burden. Very low levels were encountered from December through to June. Comparatively higher levels of hypobiosis were observed thereafter with a peak of 7.4% in September. The factors responsible for hypobiosis were not clearly defined but the phenomenon was associated with increasing levels of soil moisture storage. Host resistance, adult worm population of tracers and population of ingested L3 were ruled out as possible inducing factors.

Animals↗