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Myocardial volume perfused by coronary artery branches — a three-dimensional x-ray CT evaluation in human cadaver hearts (1992)

Liu, Y. -H. ; Bahn, R. C. ; Ritman, E. L.

Springer

The international journal of cardiovascular imaging 8 (1992), S. 95-101

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ISSN: 1573-0743

Keywords: angiography ; branching pattern ; infarct size ; myocardium at risk ; self-similarity

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract The volume of myocardium perfused by coronary arterial branches and cumulative length of the main feeder branches perfusing that volume were measured from multislice computed tomography images of human cadaver hearts with barium sulfate gel injected into the coronary arteries. Previously we have shown inin vivo pig hearts that the relationship between the volume (V), in mL, of perfused myocardium and the length (L), is well conveyed by V=M × 10−aL where M is total mass of myocardium perfused by a major epicardial artery and a is constant −0.01mm−1. In the nine human hearts studied, this relationship was V= 115×10−0006L, r=−0.894 for the LAD; V=48 × 10−0009L, r=−0.7663 for the LCX and V=103 × 10−0.004L, r=−0.673 for the RCA. These results suggest that the angiographically delineated volume of myocardium at risk of infarction, due to acute blockage along a coronary artery, could possibly be estimated from the 3D branching geometry of the epicardial coronary arterial tree.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01137530

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Potentiometric anion selectivities of polymer membranes doped with indium(III)-porphyrins (1991)

Park, S. B. ; Matuszewski, W. ; Meyerhoff, M. E. ; [et al.]

Weinheim : Wiley-Blackwell

Electroanalysis 3 (1991), S. 909-916

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ISSN: 1040-0397

Keywords: Indium ; potentiometry ; membrane ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The potentiometric anion responses of polymeric membranes doped with various indium (III)-porphyrin structures are examined. The appropriate membranes are prepared by incorporating 1.0 wt % of the In(III)-porphyrins in plasticized poly(vinyl chloride) films. When such membranes are incorporated within standard ion selective electrode bodies, the resulting electrodes display non-Hofmeister anion selectivity, with a particularly enhanced and super-Nernstian response to chloride. Among those porphyrins investigated, membranes doped with chloro(octaethylporphyrinato)indium(III) yield the largest and most reproducible potentiometric anion responses. These same membrane electrodes exhibit negligible response to protons (or hydroxide) in the range of pH 4.5-9.0. When utilized as a flow-injection detector in conjunction with a protein diluent/buffer stream, the In(III)-porphyrin based electrodes may be used to determine chloride levels in human serum samples.

Additional Material: 7 Ill.