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Biomedical subjects

C Liu

Publications and source records attributed to C Liu.

At least 829 records · Page 46Linked to original sources
PubMed1990

[Short latency somatosensory evoked potentials and brainstem auditory evoked potentials in patients with head trauma].

The SSEPs in 115 patients with head trauma were analysed by NT+ W value, da, db and b/a methods. The results revealed that the abnormal rates of the SSEPs were 94.8%. The pathological bases resulting in it were the direct and/or indirect lesion on the somatosensory pathway. The SSEPs recorded six months after the trauma indicated that the electric activities of neurons in some of the patients were still abnormal although they recovered well. The patients complicated with traumatic lesion of acoustic nerve, blood clots in external ear canal and pre-existing hearing loss had abnormal BAEPs that could not be used in diagnosing brainstem lesion. The patients without these complications in whom BAEPs were abnormal had an unfavourable outcome. The SSEPs and BAEPs simultaneously recorded could aid localization of the injury in the brain and enable discovery of the fact that the rigidity after decortication or decerebration is a result of severe injury of the cerebral hemisphere.

Adolescent↗
PubMed1990

[Diagnostic evaluation of frequency domain correlative cardiography in patients with coronary heart disease].

Frequency-domain correlative cardiography (FCG) is a new non-invasive technique for diagnosing heart disease. FCG was performed in 110 patients who also underwent coronary cineangiography. 12-lead ECG and treadmill exercise testing to determine its diagnostic role in coronary heart disease (CHD). In the group with CHD 61 had true-positive and 8 false-negative FCG results, while in the group without CHD 30 were true-negative and 11 false-positive. Its sensitivity is 88.4%, specificity 73.2%, correct diagnostic rate 84.3% and predictive value 84.7%. The diagnostic efficacy of FCG is better than those of 12-lead ECG and treadmill exercise test. These results indicate that FCG is a valuable noninvasive method for detecting patients with CHD.

Aged↗
PubMed1990

[Processing technique of American ginseng].

The article deals with a new technique for processing American ginseng cultivated in China by far-infrared and moisture absorption. The qualities of processed product as per ton-quantity (including appearance, physical properties and chemical compositions) show no difference from those of American ginseng imported from U.S.A. and Canada. The mathematical model of dry-loss weight of American ginseng during processing is given in this article.

Amino Acids↗
PubMed1990

[Comparative studies on the role of Anopheles anthropophagus and Anopheles sinensis in malaria transmission in China].

This paper reports on the studies of the role of Anopheles anthropophagus and Anopheles sinensis in malaria transmission in a sense to elucidate which one of the two species the predominance in this respect. Systematic investigations including artificial infection of mosquitoes, quantitative entomological studies and parasitological research were conducted in 1982-1987 in 5 pilot areas in Anhui (1), Guangxi (2), Sichuan (1) and Guangdong (1). The results revealed that the susceptibility of An. anthropophagus to Plasmodium falciparum was significantly higher than that of An. sifefsis. The oocyst rate and sporozoite rate of the former were 27.9% and 10.9%, while those of the latter being 11.3% and 3.0%. Significant difference in natural infection rate of the two species was also observed. The mean sporozoite rate of An. anthropophagus was 0.58% (105/17984), and that of An. sinensis was 0.02% (4/17718). Taking several essential parameters (man-biting rate, human blood index, vectorial capacity and entomological inoculation rate) into consideration, the role of An. anthropophagus in malaria transmission was 20 times more vigorous than that of An. sinensis. The malaria incidence and parasite rate of the inhabitants in site were closely related to the proportion of An. anthropophagus in human dwellings. According to the survey pursued in 1983; An. anthropophagus was the major vector playing an important role in the outbreak of vivax malaria in Shenzhen. The preceding results disclosed the important role of Anopheles anthropophagus in the transmission of falciparum and vivax malaria. The findings are of significance in the stratification of malaria endemic areas of the country and the analysis of current situation and programming malaria control measures as well.

Animals↗
PubMed1990

[Effect of a mixture of Acanthopanax senticosus and Elsholtzia splendens on serum-lipids in patients with hyperlipemia].

The serum-lipids were determined in 31 hyperlipemia patients before and after treated with the mixture of Acanthopanax senticosus and Elscholtzia splendens. While the mean value of serum beta-lipoprotein decreased from 902 +/- 228 mg/dl to 608 +/- 189 mg/dl (P less than 0.001), the mean value of HDL-C increased from 52.6 +/- 12.5 mg/dl to 61.2 +/- 15.4 mg/dl (P less than 0.001). Thus the ratios of HDL-C to total cholesterol (HDL-C/TC) and to LDL-C (HDL-C/LDL-C) increased significantly, the arteriosclerosis index (AI) decreased significantly. The results indicate that the mixture of Acanthopanax senticosus and Elsholtzia splendens could improve the lipid-metabolism in hyperlipemia patients so that it might play a good role in preventing or alleviating arteriosclerosis.

Cholesterol↗
PubMed1989

Kinetics of trypsin inhibition by its specific inhibitors.

The kinetics of inhibition of trypsin by its specific inhibitors, pancreatic trypsin inhibitor, ovomucoid trypsin inhibitor, and soybean trypsin inhibitor, has been studied by following the hydrolysis of benzoylarginine ethyl ester in the presence of the inhibitor, and the results have been analyzed with the method described previously [Tian & Tsou (1982) Biochemistry 21, 1028]. The results obtained are consistent with the following: (a) The enzyme binds with the pancreatic inhibitor irreversibly to form an inactive complex. (b) The binding with the ovomucoid inhibitor to form the inactive complex is reversible. (c) An intermediate is formed before the relatively stable inactive complex with the soybean inhibitor, and both steps are reversible. The respective microscopic rate constants are determined by suitable plots of the apparent rate constants under different substrate and inhibitor concentrations. The second-order rate constants for the initial binding step thus obtained are in accord with the apparent inactivation rate constants determined by measuring the activity remaining with a stopped-flow apparatus equipped with a multimixing system after the enzyme-inhibitor mixture has been incubated for different time intervals.

Hydrolysis↗
PubMed1989

Projection arteriography and venography: initial clinical results with MR.

Motion currently limits the applications of magnetic resonance (MR) angiography in certain regions of the body. To overcome this problem, a series of breath-hold, two-dimensional, flow-compensated gradient-echo images were acquired. These images were then processed by means of the maximum intensity projection algorithm to produce projection angiograms. The method was evaluated in 10 healthy subjects and in 12 patients and validated by comparing conventional angiograms, contrast material-enhanced computed tomographic scans, and duplex sonograms with MR projection arteriograms and venograms of the chest, abdomen, and pelvis. The aorta and pulmonary arteries and their branches were demonstrated, as was detailed anatomy of the hepatic and portal venous systems and inferior vena cava. Renal arteries and veins could be studied in both native and transplanted kidneys. The method permits determination of flow direction and differentiation of arteries and veins and is superior to three-dimensional acquisition techniques for imaging slow blood flow. Initial results suggest that the method may have clinical applications for a variety of vascular disorders.

Arteries↗
PubMed1989

Intracerebral arteriovenous malformations: evaluation with selective MR angiography and venography.

Magnetic resonance (MR) angiography and spin-echo methods were used to evaluate intracerebral arteriovenous malformations (AVMs) in 10 patients. Spin-echo images obtained with flow presaturation demonstrated the nidus of the AVM in all cases, but it was difficult to determine feeding vessels. These vessels were directly visualized with three-dimensional MR angiography; their presence could be indirectly determined by means of selective presaturation of individual vessels, which resulted in a marked decrease in signal within the portion of the AVM supplied by that vessel. Vascular supplies from the internal carotid artery and anterior, middle, or posterior cerebral arteries were detected in all cases, but in three large malformations it was not possible to demonstrate small feeding vessels. MR angiograms were also helpful for further defining the nidus. The combination of MR angiographic and spin-echo methods provides information useful for therapeutic planning not provided by either technique alone.

Adult↗
PubMed1989

MR angiography and dynamic flow evaluation of the portal venous system.

We studied the value of MR angiographic techniques in imaging the portal venous system. Projection angiograms were created by postprocessing a series of two-dimensional, flow-compensated gradient-echo images. Flow velocity was determined by a bolus-tracking method with radiofrequency tagging and multiple data readout periods. Each image was acquired during a breath-hold. MR angiography was applied to six normal subjects and four patients with abnormal hemodynamics in the portal venous system. Flow velocity determined by MR was correlated with the results of duplex sonography. The main portal vein and intrahepatic branches were shown in all cases. Portosystemic collaterals were identified in all patients with portal hypertension. In normal subjects, peak flow velocities (17.9 +/- 2.8 cm/sec) on MR correlated well with values determined by duplex sonography (17.5 +/- 2.2 cm/sec) (r = .846, p less than .04). Reversed portal blood flow was shown in two patients. One patient with portal vein thrombosis had no evidence of flow by MR angiography. Our results indicate that MR angiography can provide a three-dimensional display of normal and abnormal vascular anatomy as well as functional information in the portal venous system.

Blood Flow Velocity↗
PubMed1989

Nosocomial Legionnaires' disease.

The first proved outbreak of nosocomial Legionnaires' disease occurred in a psychiatric hospital in Washington D.C. in 1965, but the diagnosis was not established until determination of serum antibodies against Legionella pneumophila by the indirect fluorescent antibody (IFA) test was undertaken, using the bacterial antigen isolated from patients with Legionnaires' disease in the 1976 outbreak in Philadelphia. The second nosocomial outbreak of Legionnaires' disease occurred in three immunocompromised patients who received renal transplantation at the University of Kansas Medical Center and died of extensive lobar pneumonia in 1975. The direct fluorescent antibody (DFA) test revealed L. pneumophila in the lungs of all three patients after the Legionnaires' disease agent was identified. The lack of prospective surveys using sensitive diagnostic procedures by various types has limited our knowledge on the extent of the problem caused by legionella. In fact, nosocomial Legionnaires' disease is a worldwide problem, and control of this disease requires thorough cooperation of physicians, epidemiologists, microbiologists and expert engineers.

Cross Infection↗
PubMed1989

[Correlation of syndrome types in traditional Chinese medicine and insulin release curves in pre-aged and aged diabetics--an analysis of 142 cases].

This paper deals with the correlation between insulin release curves and syndrome types of TCM in 142 cases of diabetes. The syndromes were divided into 3 types: I, Qi-Yin deficiency, 94 cases; II, Yin deficiency with interior heat overabundance, 36 cases; and III, deficiency of both Yin and Yang, 12 cases. The results showed that fasting for 60 min, the postprandial (M +/- SD) of serum insulin were 18.27 +/- 1.10 mu/L and 45.21 +/- 2.82 mu/L in type I 25.47 +/- 1.88 mu/L and 60.53 +/- 0.25 mu/L in Type II; 8.29 +/- 0.93 mu/L and 19.20 +/- 1.67 mu/L in type III respectively. It was obvious that serum insulin level was Type II greater than Type I greater than Type III. But there was no difference between the aged and the pre-aged with diabetes (P greater than 0.05); even though the former was lower than the latter. According to the analysis of insulin release curve types (insulin secretion level and peak time), there were 39 cases (41.5%) of the low secretion type, 7 cases (7.5%) of the high secretion type among the 94 cases of Type I. Of the 36 cases of Type II, there were 7 cases (19.4%) of high secretion, more than that of Type I, and the highest value reached 155-106 mu/L. The 12 cases of Type III are all of the lower secretion type, with the fasting mean value being 47.5 mu/L and 10.93 mu/L and the postprandial highest value 21.69 mu/L and 20.73 mu/L, much lower than those of Types I and II. The results also showed that correlation between insulin secretion level and blood glucose value was significantly negative. The paper also discussed the mechanism of insulin secretion condition of 3 syndrome types according to the theory of TCM.

Aged↗