12476
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Jorgensen CR, Gobel FL, Taylor HL, Wang Y. Myocardial blood flow and oxygen consumption during exercise. Ann N Y Acad Sci 1977; 301:213-23. [PMID: 270917 DOI: 10.1111/j.1749-6632.1977.tb38200.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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12477
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Wang Y, Calvert LD, Gabe EJ, Taylor JB. Europium arsenic oxide Eu4As2O: a filled La2Sb structure and its relation to the K2NiF4 and GeTeU types. ACTA ACUST UNITED AC 1977. [DOI: 10.1107/s0567740877010383] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12478
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Mehta J, Wang Y, Lawrence C, Cohn JN. Aortic regurgitation associated with ventricular septal defect. Echocardiographic and hemodynamic observations. Chest 1977; 71:784-6. [PMID: 140791 DOI: 10.1378/chest.71.6.784] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Ventricular septal defect is sometimes associated with aortic regurgitation. In this report, an echocardiogram demonstrating dramatic prolapse of the noncoronary cusp into the left ventricular outflow tract and ventricular septal defect in a patient with Down's syndrome and ventricular septal defect, confirmed by angiographic studies, is presented. The echocardiogram supports the concept of anatomic lack of support of the aortic ring due to a deficient septum and hemodynamically significant flow of blood to the right ventricle through the ventricular septal defect, resulting in trauma to aortic cusps and prolapse.
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12479
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Wang Y, Gabe EJ, Calvert LD, Taylor JB. Europium–arsenic Eu2As2: a single-crystal structure refinement. ACTA ACUST UNITED AC 1977. [DOI: 10.1107/s0567740877002775] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12480
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Wang Y, Kim P, van Eys DC, Sutow WW. Study of contaminants and metabolites during therapy with high doses of methotrexate. Clin Chem 1976; 22:1937. [PMID: 975560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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12481
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Wang Y, Kim P, van Eys DC, Sutow WW. Study of contaminants and metabolites during therapy with high doses of methotrexate. Clin Chem 1976. [DOI: 10.1093/clinchem/22.11.1937] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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12482
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Wang Y, Lantin E, Sutow WW. Methotrexate in blood, urine, and cerebrospinal fluid of children receiving high doses by infusion. Clin Chem 1976. [DOI: 10.1093/clinchem/22.7.1053] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Methotrexate was determined in plasma (31 patients), urine (eight patients), and cerebrospinal fluid (two patients) after high doses (35 to 150 mg/kg) by infusion, with citrovorum factor rescue. Concentrations in plasma were proportional to dose at 6, 24, 72 h after beginning treatment, but this trend was very minimal for samples obtained at 48 h. Clinical toxicity probably will not be serious if the methotrexate concentration in the serum is less than 4.5 X 10(-6) mol/liter at 48 h after the start of a 6-h infusion. In both of the two patients so examined, therapeutic concentrations appeared in cerebrospinal fluid after intravenous infusion of the drug. A kinetic enzymic method, radioassay, and radioimmunoassay all yielded similar results for drug concentrations.
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12483
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Wang Y, Lantin E, Sutow WW. Methotrexate in blood, urine, and cerebrospinal fluid of children receiving high doses by infusion. Clin Chem 1976; 22:1053-6. [PMID: 1277503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Methotrexate was determined in plasma (31 patients), urine (eight patients), and cerebrospinal fluid (two patients) after high doses (35 to 150 mg/kg) by infusion, with citrovorum factor rescue. Concentrations in plasma were proportional to dose at 6, 24, 72 h after beginning treatment, but this trend was very minimal for samples obtained at 48 h. Clinical toxicity probably will not be serious if the methotrexate concentration in the serum is less than 4.5 X 10(-6) mol/liter at 48 h after the start of a 6-h infusion. In both of the two patients so examined, therapeutic concentrations appeared in cerebrospinal fluid after intravenous infusion of the drug. A kinetic enzymic method, radioassay, and radioimmunoassay all yielded similar results for drug concentrations.
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12484
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Xiong Y, Zhang J, Xu S, Pan P, Wang Y. [Preliminary study on the relationship between the immunogenic inhibition by phenargen and the termination of pregnancy by trichosanthin. (Author's transl)]. DONG WU XUE BAO. [ACTA ZOOLOGICA SINICA] 1976; 22:187-91. [PMID: 12278423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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12485
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Wang Y, Blessing RH, Ross FK, Coppens P. Charge density studies below liquid nitrogen temperature: X-ray analysis of p-nitropyridine N-oxide at 30 K. ACTA ACUST UNITED AC 1976. [DOI: 10.1107/s0567740876003439] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12486
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Armaly MF, Wang Y. Demonstration of acid mucopolysaccharides in the trabecular meshwork of the Rhesus monkey. INVESTIGATIVE OPHTHALMOLOGY 1975; 14:507-16. [PMID: 49331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The ability to demonstrate AMPS in the trabecular region in the normal eye of the Rhesus monkey was shown to be critically dependent upon technical variation. Staining the fixed specimen prior to dehydration and embedding permits the uniform demonstration of AMPS in the trabecular region of the Rhesus monkey and shows it to be hyaluronidase-sensitive. Electron microscopy using the modified technique shows the reaction products to be present within the trabecular band, the intertrabecular spaces, and the canal of Schlemm. More impressive distribution was seen in the basement membrane of trabecular endothelium intimately related to the cell wall and in the ground substance and basement membrane of the endothelium of the inner wall of the canal Schlemm. The technique is also successful in the human eye and suggests a greater abundance of trabecular AMPS in open-angle glaucoma.
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12487
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Rosenquist R, Gobel FL, Wang Y. Hemodynamic changes during ventricular pacing in patients with complete heart block and aortic and mitral valvular heart disease. Am Heart J 1975; 89:144-52. [PMID: 1114941 DOI: 10.1016/0002-8703(75)90038-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Increasing the heart rate to near normal in patients with complete heart block (CHB) and slow ventricular rates may lead to greater improvement in ventricular function than when the heart rate is increased from normal to more rapid heart rates. Improvement in ventricular function is usually manifested by a decrease in left ventricular end-diastolic pressure (LVEDP) and volume and by an increase in contractility. In patients with both CHB and valvular heart disease improvement in ventricular function during pacing may be modified by the nature of the valvular disease. Hemodynamic data from six patients with both valvular heart disease and CHB were compared with those from ten patients with CHB and normal cardiac valves. Hemodynamic studies were performed at slow or idioventricular rates and again after increasing the heart rate to more nearly normal levels by ventricular pacing. When obstruction to left ventricular inflow (mitral stenosis) co-existed with CHB, increasing the heart rate resulted in a reduction of an elevated LVEDP to normal. This resulted in only a small increase in left atrial pressure in spite of a striking increase in the mean left atrial-ventricular gradient. When obstruction to left ventricular outflow prevailed (aortic stenosis), improvement in cardiac function was manifested mainly by a decrease in LVEDP and was accompanied by a decrease in left ventricular stroke work. When a large regurgitant volume (aortic insufficiency) was added to a ventricle which has enlarged subsequent to CHB, there was striking elevation in ventricular filling pressures which returned to more nearly normal levels when the heart rate was increased. This was accompanied by a reduction in regurgitant stroke volume in the patient in whom it was measured. Thus, an increase in heart rate may be especially beneficial to those patients with CHB who also have valvular lesions which contribute to an increase in LVEDP and end-diastolic volume. Careful hemodynamic evaluation is helpful in determining appropriate therapy in these patients.
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12488
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Nelson RR, Gobel FL, Jorgensen CR, Wang K, Wang Y, Taylor HL. Hemodynamic predictors of myocardial oxygen consumption during static and dynamic exercise. Circulation 1974; 50:1179-89. [PMID: 4430113 DOI: 10.1161/01.cir.50.6.1179] [Citation(s) in RCA: 333] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Hemodynamic predictors of myocardial oxygen consumption (MVO
2
) during static and dynamic exercise were examined in ten normal subjects. Studies were done under the following circumstances: 1) during upright bicycle exercise at an average heart rate of 147 beats/min, 2) during static exercise with an isometric load in the left hand equal to 17% of the maximal voluntary contraction (MVC), and 3) during combined dynamic exercise (average heart rate 147 beats/min) and static exercise using 17% MVC of the left hand. Mean myocardial blood flow (MBF) was 181 ml/100 gm LV/min during dynamic exercise, 98 ml/100 gm LV/min during static exercise, and 201 ml/100 gm LV/min during combined static and dynamic exercise. Addition of a static load to the dynamic load resulted in a higher blood pressure (average 12 mm Hg), MVO
2
and MBF than during dynamic exercise alone. MVO
2
correlated best with products of heart rate and blood pressure regardless of whether the blood pressure was obtained by a central aortic catheter (
r
= 0.88) or by a blood pressure cuff (
r
= 0.85).
When the current data were combined with previous data, 82 determinations of MVO
2
and MBF in 29 normal subjects during several levels of upright exercise were available for analysis. Forty-four determinations were done during dynamic upright exercise, 18 during exercise after propranolol, ten during combined static and dynamic work, and ten during static work alone. MVO
2
correlated best with the product of heart rate and blood pressure (
r
= 0.86). Heart rate alone correlated better with MVO
2
(
r
= 0.82) than did the tension time index (
r
= 0.65) or the product of systolic blood pressure, heart rate, and ejection time (
r
= 0.68). The readily measured variables of heart rate and of heart rate x blood pressure correlated well with MVO
2
in normal young men during exercise under a wide variety of circumstances.
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12489
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Wang Y. Regional renogram. A screening test for renal hypertension evaluation. ARCHIVES OF INTERNAL MEDICINE 1974; 134:463-6. [PMID: 4854068 DOI: 10.1001/archinte.134.3.463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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12490
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Wang Y, Stucky GD. The squaric acid molecule: a hydrogen bond study of dimethylammonium hydrobis(hydrogen squarate)(H2NMe2)+[H3(C4O4)2]? ACTA ACUST UNITED AC 1974. [DOI: 10.1039/p29740000925] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12491
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12492
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Jorgensen CR, Wang K, Wang Y, Gobel FL, Nelson RR, Taylor H. Effect of propranolol on myocardial oxygen consumption and its hemodynamic correlates during upright exercise. Circulation 1973; 48:1173-82. [PMID: 4762475 DOI: 10.1161/01.cir.48.6.1173] [Citation(s) in RCA: 115] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Measurements were made of heart rate, aortic blood pressure, systolic ejection period/beat, myocardial blood flow, and myocardial oxygen consumption in nine normal young men during three bouts of upright bicycle exercise: 1) at the workload which produced a heart rate of 120 beats/minute, 2) at the higher workload necessary to produce a heart rate of 120 beats/minute after administration of intravenous propranolol 0.25 mg/kg, and 3) with infusion of propranolol, at the same workload as the first exercise bout. Comparing exercises 1 and 2, we found a much higher workload was required to produce the same heart rate after propranolol. The blood pressure, heart rate-blood pressure product, and myocardial oxygen consumption were the same despite the much greater level of exertion. Comparing exercises 1 and 3, the heart rate, blood pressure, heart rate-blood pressure product, and myocardial oxygen consumption were all significantly lower during exercise 3 after propranolol despite the fact that the same degree of exercise was being done. As in previous studies, the heart rate-blood pressure product was an excellent correlate of myocardial oxygen consumption despite the change in contractility induced by propranolol. The systolic ejection period was prolonged significantly altering the tension-time index (TTI), which became an inadequate index of myocardial oxygen consumption. It is concluded that the heart rate-blood pressure product is a good index of myocardial metabolic needs during exercise and the relationship is undistorted by marked changes in contractility, but the tension-time index is a poor correlate. This data emphasizes the fact that the relative metabolic loads for the whole body and for the heart are determined separately and may not change in parallel with a given intervention.
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12493
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Wang Y. Regional (compartmental) renogram for hypertension evaluation. THE AMERICAN JOURNAL OF ROENTGENOLOGY, RADIUM THERAPY, AND NUCLEAR MEDICINE 1973; 118:842-51. [PMID: 4782954 DOI: 10.2214/ajr.118.4.842] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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12494
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Wang Y, Stucky GD. Bonding and valence electron distributions in molecules. The crystal and molecular structure of 1,1,2,2-tetracyanocyclopropane. ACTA ACUST UNITED AC 1973. [DOI: 10.1107/s0567740873004346] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12495
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Abstract
Hemodynamic data obtained at cardiac catheterization from 40 patients with valvular aortic stenosis demonstrated that, although left ventricular ejection time was prolonged, the usual linear inverse relationship between heart rate and ejection time was preserved at a longer than normal mean ejection time. In contrast to this, the direct linear relationship between ejection time and stroke volume which exists in normal human subjects was totally obliterated in patients with aortic stenosis so that ejection time appeared to be totally unrelated to stroke volume. However, the degree of prolongation of left ventricular ejection time above that predicted from stroke volume (ΔLVET) was closely correlated with aortic valve area (AVA), so that aortic valve area could be predicted as AVA = 0.91 – 3.6 ΔLVET within 95% confidence limits of ± 0.16 cm
2
. Alternatively, if ejection time was not abnormally prolonged, it was possible to predict with 95% confidence that the aortic valve area was greater than 0.75 cm
2
in cross-sectional area and thus not within the range generally requiring surgical therapy.
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12496
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Probstfield JL, Wang Y, From AH. Cation transport in Duchenne muscular dystrophy erythrocytes. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1972; 141:479-81. [PMID: 4636514 DOI: 10.3181/00379727-141-36802] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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12497
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Bache RJ, From AH, Castaneda AR, Jorgensen CR, Wang Y. Late thrombotic obstruction of Starr-Edwards tricuspid valve prosthesis. Chest 1972; 61:613-6. [PMID: 5031753 DOI: 10.1378/chest.61.7.613] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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12498
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Goldfarb B, Wang Y. Spontaneous healing of interventricular septal defects due to nonpenetrating trauma. MINNESOTA MEDICINE 1972; 55:325-7. [PMID: 5013960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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12499
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12500
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Kitamura K, Jorgensen CR, Gobel FL, Taylor HL, Wang Y. Hemodynamic correlates of myocardial oxygen consumption during upright exercise. J Appl Physiol (1985) 1972; 32:516-22. [PMID: 5026501 DOI: 10.1152/jappl.1972.32.4.516] [Citation(s) in RCA: 379] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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