10626
|
Zhang Y, Nitter-Hauge S, Myhre E. Determination of the mean pressure gradient in mitral stenosis by Doppler echocardiography. Eur Heart J 1985; 6:858-64. [PMID: 4076197 DOI: 10.1093/oxfordjournals.eurheartj.a061773] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Measurement of the mean pressure gradient provides an important estimation of the severity of mitral stenosis. However, determination of the mean pressure gradient from Doppler recordings has been unsatisfactory using previously described methods. In this study, a new method calculating the mean pressure gradient, the integral method is described. It was developed from mathematical analysis of Doppler velocity curves. Doppler echocardiography and cardiac catheterisation were performed in 23 patients with mitral stenosis to evaluate the accuracy of three current mathematical methods of determining the mean pressure gradient. The mean pressure gradients calculated by the three methods correlated highly with that measured by catheterisation (r = 0.93). However, the mean pressure gradients calculated by the previously described mean velocity square method and the arithmetical average method underestimated significantly that measured by cardiac catheterisation. In contrast, there was no significant difference between the mean pressure gradients calculated by the integral method and measured by cardiac catheterisation. These results confirm the usefulness of Doppler echocardiography for determining the mean pressure gradient in mitral stenosis and demonstrate that among current methods, the integral method provides the most accurate calculations of the mean pressure gradient.
Collapse
|
10627
|
Zhang Y, Ihlen H, Myhre E, Levorstad K, Nitter-Hauge S. Measurement of mitral regurgitation by Doppler echocardiography. BRITISH HEART JOURNAL 1985; 54:384-91. [PMID: 4052279 PMCID: PMC481916 DOI: 10.1136/hrt.54.4.384] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In an attempt to develop a new approach to the non-invasive measurement of mitral regurgitation, Doppler echocardiography and left ventriculography were performed in 20 patients without valvar heart disease (group A) and in 30 patients with pure mitral regurgitation (group B). Volumetric flows through the aortic and the mitral orifices were determined by Doppler echocardiography. Aortic flow (AF) was calculated as the product of the aortic orifice area and the systolic velocity integral. The mitral flow (MF) was calculated as the product of the corrected mitral orifice area and the diastolic velocity integral. The mitral regurgitant fraction (RF) was calculated as RF = 1 - AF/MF. In group A aortic and mitral flow were very similar and the difference between the two did not differ significantly from zero. In group B the mitral flow was significantly larger than the aortic flow. There was a good correlation (r = 0.82) between the regurgitant fraction determined by Doppler echocardiography and the regurgitant grades determined by left ventriculography. The regurgitant fraction increased significantly with each grade of severity. These results show that Doppler echocardiography can be used to give a reliable measure of both aortic and mitral flow. This technique is a new and promising approach to the non-invasive measurement of mitral regurgitation.
Collapse
|
10628
|
Li SR, Huang M, Zhang Y, Lu G, Wang Q, Chen LX, Zhou GC. Effect of vagus nerve on the action potential duration of ventricular cell of dog. I. Effect of stimulation of vagus nerve and atropine. ACTA ACADEMIAE MEDICINAE WUHAN = WU-HAN I HSUEH YUAN HSUEH PAO 1985; 5:139-46. [PMID: 2999666 DOI: 10.1007/bf02911170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
10629
|
Zhang Y. [Studies of the physical measurements and health status of Down's syndrome patients]. ZHONGHUA YU FANG YI XUE ZA ZHI [CHINESE JOURNAL OF PREVENTIVE MEDICINE] 1985; 19:206-8. [PMID: 2932320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
10630
|
Zhang Y, Rushbrook JI, Shafiq SA. Avian adductor profundus muscle: characterization of a pure slow tonic region by histochemical, monoclonal antibody and peptide mapping studies. J Muscle Res Cell Motil 1985; 6:333-45. [PMID: 2933426 DOI: 10.1007/bf00713173] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The fibre type composition of the avian adductor profundus (AP) muscle which is composed of a thick white posterior part (Post. AP) and a thin red anterior part (Ant. AP) was investigated. Using the histochemical ATPase technique, monoclonal antibody analysis of myosin and C-protein isoforms, and electrophoretic and peptide mapping analyses of myosin, we have established that the Post. AP is composed of essentially pure slow tonic fibres similar to those of the anterior latissimus dorsi muscle (ALD). The Ant. AP, on the other hand, is shown to contain a mixture of slow and fast fibres, the latter giving immunocytochemical reactions atypical of the fast fibres. The larger size of the Post. AP in comparison with the ALD muscle should provide significantly more tissue for biochemical studies of tonic fibres than was previously available.
Collapse
|
10631
|
Zhang Y. [Parietal cell vagotomy with pyloric dilatation for pyloric obstruction]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1985; 23:356, 382. [PMID: 4053851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
10632
|
Tang ZD, Zhang Y, Wang LT. [Determination of urinary bradykinin in liver cirrhosis]. ZHONGHUA NEI KE ZA ZHI 1985; 24:348-9, 381-2. [PMID: 4017751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
10633
|
Zheng G, Guo S, Zhang Y, Wang J. [A preliminary inquiry into the problem of floating population in Shanghai city proper]. REN KOU YAN JIU = RENKOU YANJIU 1985:2-7. [PMID: 12341124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
|
10634
|
Barbier J, Corro G, Zhang Y, Bournville J, Franck J. Coke formation on bimetallic platinum/rhenium and platinum/iridium catalysts. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/s0166-9834(00)84470-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
10635
|
Zhang Y. [Applying information to improve family planning in Gaoping County]. REN KOU YAN JIU = RENKOU YANJIU 1985:20-1. [PMID: 12341115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
|
10636
|
Zhang Y, Nitter-Hauge S, Ihlen H, Myhre E. Doppler echocardiographic measurement of cardiac output using the mitral orifice method. Heart 1985; 53:130-6. [PMID: 3966956 PMCID: PMC481730 DOI: 10.1136/hrt.53.2.130] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Cardiac output was determined in 20 patients with various cardiac conditions by measuring the cross sectional area of the mitral orifice by echocardiography and the transmitral flow by the Doppler technique. Cardiac output was calculated by multiplying the corrected mitral orifice area by the maximum diastolic velocity integral recorded by the pulsed mode. The results were compared with that obtained by the Fick method. The correlation for cardiac output by the two techniques was high in the whole group, particularly in patients without mitral regurgitation. There was also a good correlation for stroke volume determined by the two methods. Cardiac output was significantly overestimated by the continuous mode and in patients with mitral regurgitation. These results show that the mitral orifice method provides a new and reliable approach to the non-invasive measurement of cardiac output.
Collapse
|
10637
|
Shen GL, Zhang Y, Yu RQ. [Studies on PVC membrane anisodamine selective electrodes]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1985; 20:151-4. [PMID: 4036622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
10638
|
Zhang Y, Shafiq SA. A freeze-fracture study of postembryonic differentiation of latissimus dorsi muscles of the chicken. J Morphol 1985; 183:145-53. [PMID: 3973926 DOI: 10.1002/jmor.1051830203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The differentiation of fiber type characteristics in the anterior (ALD) and posterior (PLD) latissimus dorsi muscles is examined by the freeze-fracture technique in 1-, 7- and 30-day-old chicks. Several characteristics of plasma membrane (caveolae, rectilinear arrays, intramembranous particles) and sarcoplasmic reticulum which show fiber type differences in the adult ALD and PLD muscles are compared in the developmental stages. The caveolar density in the ALD fibers is about 20/microns2 at 1 day increasing to about 37/microns2 at 30 days, whereas in the PLD fibers it remains at about 20/microns2 during this period. The distribution of the caveolae in the two muscles is different from the beginning; in the ALD fibers the caveolae are distributed throughout the plasma membrane and in PLD fibers they are patterned into clusters overlying the I band regions. The density of intramembranous particles of 1-day ALD and PLD plasma membranes appears similar, but by 7 days the particle counts in the sarcolemma of the ALD muscle are about twice as numerous as those in the PLD muscle. The rectilinear arrays are virtually absent in the ALD muscle, whereas in the PLD muscle their density is about 10/microns2 at 1 day and about 20/microns2 at 7 days. Already at 1 day posthatching the SR in ALD and PLD fibers has the adult configuration, i.e., an open irregular network in ALD fibers and periodically arranged tubules with triadic expansions in the PLD fibers.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
|
10639
|
Tewarson RP, Stephenson JL, Garcia M, Zhang Y. On the solution of equations for renal counterflow models. Comput Biol Med 1985; 15:287-95. [PMID: 4042634 DOI: 10.1016/0010-4825(85)90012-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The results of a comparative study of three discretization techniques and the solution of the resulting algebraic equations by three methods is given. For this study, a four-tube central core model with diffusion in the core was selected and equations were derived for a coherent and efficient implementation. The results of this study show that sparse matrix techniques that take the physiological connectivity of the kidney lead to significant savings in computer storage, running time and overall cost.
Collapse
|
10640
|
Zhang Y, Matijević E. Stability of monodispersed hematite sols in the presence of citric acid. Colloid Polym Sci 1984. [DOI: 10.1007/bf01451544] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
10641
|
Liang J, Zhang Y. The studies on the phase transition of LiIO 3. Acta Crystallogr A 1984. [DOI: 10.1107/s0108767384096045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
10642
|
Li SR, Zeng JT, Ding BC, Gu RM, Huang M, Zhang Y, Zhang Y. Simultaneous recording of ECG and transmembrane action potentials of ventricular cells of anesthetized rabbit under natural breathing. ACTA ACADEMIAE MEDICINAE WUHAN = WU-HAN I HSUEH YUAN HSUEH PAO 1984; 4:21-2. [PMID: 6700923 DOI: 10.1007/bf02856944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
10643
|
Reynolds JD, Golden WL, Zhang Y, Hiles DA. Ocular abnormalities in terminal deletion of the long arm of chromosome seven. J Pediatr Ophthalmol Strabismus 1984; 21:28-32. [PMID: 6423801 DOI: 10.3928/0191-3913-19840101-08] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Patients with distal deletions of the long arm of chromosome 7q have been reported with a variety of non-specific findings. Ocular findings have been limited to hypertelorism, palpebral fissure abnormalities, strabismus and speckled irides and no intraocular pathology with the exception of one case with unilateral optic nerve coloboma. We report a patient with terminal deletion of the long arm of chromosome 7 with marked ocular abnormalities including severe microphthalmus and large retinal colobomas.
Collapse
|
10644
|
Zhang Y, Han ZX, Li ST, Chen GJ, He DN. Chinese medicinal therapy for postburn residual ulcer. Clinical observation on 48 healed cases. J TRADIT CHIN MED 1983; 3:279-82. [PMID: 6562300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
|
10645
|
Liang CK, Guan NY, Ma F, Zhang Y, Wang EM, Yin XR. [Carcinogenicity in mice of soot extract collected from Xuan Wei County]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1983; 5:307-10. [PMID: 6329534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
10646
|
Reisine TD, Zhang Y, Sekura RD. Pertussis toxin blocks somatostatin's inhibition of stimulated cyclic AMP accumulation in anterior pituitary tumor cells. Biochem Biophys Res Commun 1983; 115:794-9. [PMID: 6138037 DOI: 10.1016/s0006-291x(83)80004-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Somatostatin inhibits both forskolin and (-) isoproterenol-stimulated cyclic AMP accumulation in AtT-20 cells. Pretreatment of these cells with pertussis toxin prevents somatostatin's inhibitory effects on cyclic AMP production. This pretreatment also enhances the cyclic AMP response to forskolin and (-) isoproterenol without affecting basal cyclic AMP levels. The blockade of somatostatin's inhibitory effect was dependent both on the time of preincubation and concentration of pertussis toxin used. The rise in forskolin-stimulated cyclic AMP formation following pertussis toxin treatment preceded the blockade of somatostatin's inhibitory actions. The results suggest that somatostatin acts through an inhibitory guanine nucleotide regulatory protein to affect adenylate cyclase activity.
Collapse
|
10647
|
Zhang Y, Smith D. Concurrent metabolism of the phytoalexins phaseollin, kievitone and phaseollinisoflavan by Fusarium solani f. sp. phaseoli. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0048-4059(83)90036-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
10648
|
Zhang Y, Su W. A review of the current impact of measles in the People's Republic of China. REVIEWS OF INFECTIOUS DISEASES 1983; 5:411-6. [PMID: 6878991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Before the vaccine era, epidemics of measles occurred in alternate years on the mainland of China. During epidemic years the annual incidence was as high as 1,000-5,000 cases/100,000 population, with a fatality rate of 1% to 2%. In 1965, when highly attenuated measles vaccine was developed in China, a vaccination campaign was launched throughout the country. In its early years, the immunization program was not implemented simultaneously at all places, and outbreaks that continued to occur in some areas resulted in a moderate local incidence of measles despite a decline in the overall incidence. From the late 1970s on, stronger measures were taken by local health authorities with regard to measles vaccination. By 1980 the incidence had dropped further; in that year the number of reported cases was 570,037, with 3,862 deaths. Both morbidity and mortality related to measles dropped drastically after vaccination from levels in the prevaccine era, but measles still accounts for an appreciable proportion of all cases of infectious disease.
Collapse
|
10649
|
Xie MZ, Zhou WZ, Zhang Y. Oxymatrine metabolic fate. Chin Med J (Engl) 1983; 96:145-50. [PMID: 6406172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
|
10650
|
Karge H, Hatada K, Zhang Y, Fiedorow R. Conversion of alkylbenzenes over zeolite catalysts II. Disproportionation of ethylbenzene over faujasite-type zeolites. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0144-2449(83)90080-5] [Citation(s) in RCA: 89] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|