The effect of temperature and shear rate on platelet aggregation
Tóm tắt
Samples of whole blood were obtained from male volunteers and exposed to combinations of shear rates and temperatures representative of cardiopulmonary bypass (CPB) in a modified computer-controlled concentric cylinder rotational viscometer for a period of 100 s. Blood sampled from the chamber was fixed in paraformaldehyde, stained with CD41 and analysed by flow cytometry. Only platelet-positive particles were acquired, each individual cell, or aggregate of cells, identified by analysis of its fluorescence and forward light scatter characteristics. Little platelet aggregation was observed at shear rates of less than 4000 s-1 for temperatures of greater than 24°C, but large numbers of aggregates were formed at all temperatures at 4000 s-1 (p<0.05), with more aggregates forming at 24 and 30°C than at 37 and 42°C (p<0.05). We conclude that the process of aggregation is dependent on both temperature and shear rate. We note that a large number of platelets become involved in aggregates under conditions of temperature and shear-rate typical of CPB.
Tài liệu tham khảo
P. M. GALLETTI and G. A. BRECHER, in “Principles and Techniques of Extracorporeal Circulation” D. Wagner and Stamp (eds) (Grune and Stratton, New York, 1962), p. 1.
G. W. ROACH, M. KANCHUGER, C. M. MANGANO, M. NEWMAN, N. NUSSMEIER, R. WOLMAN, A AGGARWAL, K. MARSCHALL, S. H. GRAHAM, C. LEY, G. OZANNE and D. T. MANGANO, N. Engl. J. Med. 335 (1996) 1857.
C. T. MORA and D. T. MANGANO, J. Intens. Care 1 (1996) 1.
C. T. MORA and J. M. MURKIN, in “Cardiopulmonary Bypass: Principles and Techniques of Extracorporeal Circulation” G. Smith (ed.) (Springer, New York, 1995), p. 114.
P. J. SHAW, D. BATES, N. E. F. CARTLIDGE, D. HEAVISIDE, D. G. JULIAN and D. A. SHAW, Br. Med. J. 291 (1985) 1384.
K. A. SOTANIEMI, Arch Neurol. 40 (1983) 75.
M. A. HALM, Amer. J. Crit. Care 5 (1996) 109.
S. E. MARREN, Optom. Vis. Sci. 71 (1994) 462.
I. T. FESSATIDIS, J. J. BRANNAN, K. M. TAYLOR, M. KANELLAKI-KYPARISSI, A. K. ABDULLA and E. C. OLSEN, Perfusion 9 (1994), 23.
M. D. MEDLOCK, R. S. CRUSE, S. J. WINEK, D. M. GEISS, R. L. HORNDASCH, D. L. SCHULTZ and J. C. ALDAG, Ann. Neurol. 34 (1993) 820.
M. R. GOMES and D. C. MCGOON, J. Thorac. Cardiovasc. Surg. 60 (1970) 87.
D. T. PEARSON and B. MCARDLE, Perfusion 4 (1989) 9.
K. UTHOFF, K. J. ZEHR, R. GEERLING, A HERSKOWITZ, D. E. CAMERON and B. A. REITZ, Circulation 90 (1994) II–269.
R. C. DUTTON, L. H. EDMUNDS, J. C. HUTCHINSON and B. B. ROE, J. Thorac. Cardiovasc. Surg. 67 (1974) 258.
D. E. CHENOWETH, S. W. COOPER, T. E. HUGLI, R. W. STEWART, E. H. BLACKSTONE and J. W. KIRKLIN, N. Engl. J. Med. 304 (1981) 497.
D. E. HAMMERSCHMIDT, T. K. STRONCEK, C. J. LAMMIKEEFE, D. M. KURTT, A. OZALINS, D. M. NICOLOFF, R. C. LILLEKEI, P. R. CRADDOCK and H. S. JACOBS J. Thorac. Cardiovasc. Surg. 81 (1981) 370.
H. GRANS and W. KRIVIT, Ann. Surg. 155 (1962) 353.
K. KONSTANTOPOULOS, K. K. WU, M. M. UDDEN, E. I. BANEZ, S. J. SHATTIL and J. D. HELLUMS, Biorheology 32 (1995) 73.
J. BOLDT, C. KNOTHE, B. ZICKERMANN, S. BILL, F. DAPPER and G. HEMPELMANN, Ann. Thorac. Surg. 55 (1993) 652.
M. A. ORCHARD, C. S. GOODCHILD, C. R. PRENTICE, J. A. DAVIES, S. E. BENOIT, L. J. CREIGHTON-KEMSFORD, P. J. GAFFNEY and A. D. MICHELSON, Br. J. Haematol. 85 (1993) 533.
N. TABUCHI, J. DE HAAN, P. W. BOONSTRA, R. C. HUET and W. VAN OEVEREN, Eur. J. Cardiothorac. Surg. 8 (1994) 87.
M. MURASE, A. USUI, Y. TOMITA, M. MAESA, T. KOYAMA and T. ABE, Circulation 88 (1993) II–432.
T. M. REILLY, M. S. FORSYTHE, A. L. RACANELLI, S. M. SPITZ, H. L. WALTON and S. A. MOUSA, Thromb. Res. 71 (1993) 61.
P. Y. HUANG and J. D. HELLUMS, Biophys. J. 65 (1993) 344.
P. VOISIN, C. GUIMONT and J. F. STOLTZ, Biorheology 22 (1986) 425.