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Respiratory and Cardiovascular Responses to Hypoxia, Hyperoxia and Perfusion of the Carotid Arteries in Cholesterol-Fed Rabbit

  • B. Flemming
  • T. Encke
  • D. Roloff
  • E. Seeliger
  • Th. Wronski

Abstract

In previous experiments in rabbits with an experimental atherosclerosis we have observed that the cardiovascular basic values showed only small differences between the normal and cholesterol-fed rabbits, whereas the engagement of the cardiovascular effector mechanism in realizing the regulatory responses after stimulation of the carotid baroreceptors has changed.1 Based on indirect studies, it is generally considered that a decrease in the sensitivity of arterial baroreceptors occurs with aging and hypertension. It has been suggested that atherosclerotic changes in the carotid sinus are one factor contributing to the reduced reflex sensitivity2. In our experiments the external perfusion system influenced the carotid baroreceptors as well as the carotid body chemoreceptors. From this we suggested that the carotid bodies are involved in the reflex cardiovascular function by alteration of the perfusion pressure of the isolated carotid arteries1. In this study we tested the hypothesis that the carotid bodies should be affected in a similar way to those of other organs during the development of the experimental atherosclerosis, an increased level of spontaneous chemoreceptor activity engendered by stagnant hypoxia through a reduction in their blood flow or by increases of the diffusion barrier. To evaluate the reflex functions of the carotid bodies in experimental atheromatosis, the respiratory responses to hyperoxia and hypoxia were compared with those obtained in the normal group of conscious animals. The cardiovascular responses to hyperoxia and/or hypoxia and to the changes of the perfusion of the isolated carotid sinus from arterial blood to venous blood under constant perfusion pressure were recorded under conditions of anesthesia in both groups of animals.

Keywords

Carotid Body Carotid Sinus Stagnant Hypoxia Experimental Atherosclerosis Carotid Baroreceptor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    K. Wilfert, K. Drischel, B. Flemming, and D. Roloff, Cardiovascular regulation in experimental atherosclerosis after cholesterol feeding in rabbits. Adv. Physiol. Sci. 35:385 (1981).Google Scholar
  2. 2.
    R. H. Cox, R. J. Bagshaw, and D. K. Detweiler, Alterations in carotid sinus reflex control of arterial hemodynamics associated with experimental hyperlipemia in the racing greyhound, Circ. Res. 46:237 (1980).Google Scholar
  3. 3.
    T. Kurozumi, K. Tanaka, and Y. Yae, Hypertension-induced cerebral atherosclerosis in the cholesterol-fed rabbit. Atherosclerosis 30: 137 (1978).CrossRefGoogle Scholar
  4. 4.
    M. Dubey and C. P. Thakur, Influence of linsed oil on cholesterol- induced atherosclerosis in rabbits. Atherosclerosis 32:81 (1979).CrossRefGoogle Scholar
  5. 5.
    P. Tarugi, S. Calandra, P. Borella, and G. F. Vivoli, Heavy metals and experimental atherosclerosis. Atherosclerosis 45:221 (1982).CrossRefGoogle Scholar
  6. 6.
    A. Hecht, H. Guski, D. Kunde, K. Wilfert, and G. Tontschev, Morphologische Befunde an Koronararterien und Myokard des Kaninchens bei experimenteller Fütterungsatheromatose, Exp. Pathol. 7:29 (1972).Google Scholar
  7. 7.
    J. E. Angell-James and T. C. B. Dehn, The use of the neck chamber test in the evaluation of the carotid sinus baroreceptor reflex control of heart rate in the atherosclerotic patient, J. Physiol. 325:11P (1981).Google Scholar
  8. 8.
    J. E. Angell-James and M. J. George, Carotid sinus baroreceptor reflex control of the circulation in medial sclerotic and renal hypertensive rabbits and its modification by the aortic baroreceptors, Circ. Res. 47:890 (1980).Google Scholar
  9. 9.
    J. E. Angell-James, Arterial baroreceptor activity in rabbits with experimental atherosclerosis, Circ. Res. 34:27 (1974).Google Scholar
  10. 10.
    M. de B. Daly, Reflexes from chemoreceptors and their interactions. Arch. Int. Physiol. Biochim. 89:IV (1981).Google Scholar
  11. 11.
    J. M. Marshall, Cardiovascular responses to peripheral chemoreceptor stimulation in the rat, J. Physiol. 354:64P (1984).Google Scholar
  12. 12.
    N. C. Olson, N. E. Robinson, D. L. Anderson, and J. B. Scott, Effect of carotid body hypoxia and/or hypercapnia on pulmonary vascular resistance, Proc. Soc. Exp. Biol. Med. 170:188 (1982).Google Scholar
  13. 13.
    P. I. Korner, The role of the arterial chemoreceptors and baroreceptors in the circulatory response to hypoxia of the rabbit, J. Physiol. 180:279 (1965).Google Scholar
  14. 14.
    R. G. O’Regan and S. Majcherczyk, Role of peripheral chemoreceptors and central chemosensitivity in the regulation of respiration and circulation, J. Exp. Biol. 10:23 (1982).Google Scholar
  15. 15.
    W. Quies, T. Claus, and A. Honig. Die Hyperventilation der Hypertoniker - Eine Pilotstudie zum Verhalten der Reflexe der arteriellen Chemore- zeptoren bei hypertensiven Erkrankungen, Dt. Gesundh.-Wesen 38:612 (1983).Google Scholar
  16. 16.
    T. Shiga and N. Maeda, Influence of membrane fluidity on erythrocyte functions, Biorheology 17:485 (1980).Google Scholar
  17. 17.
    H. Walter, E. R. Levin, E. J. Krob, and S. D. Mills, Partitioning of erythrocytes from spontaneously hypertensive and wistar-kyotorats. Hypertension 10:533 (1986).Google Scholar
  18. 18.
    C. Pfeiffer, J.-O. Habeck, H. Rotter, R. Behm, M. Schmidt, and A. Honig, Influence of age on carotid body size and arterial chemorecep- tor reflex effects in spontaneously hypertensive (SHR) and normoten- sive rats, Biomed. Biochim. Acta 43:205 (1984).Google Scholar

Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • B. Flemming
    • 1
  • T. Encke
    • 1
  • D. Roloff
    • 1
  • E. Seeliger
    • 1
  • Th. Wronski
    • 1
  1. 1.Institute of PhysiologyHumboldt-UniversityBerlinGDR

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