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Renal vasoconstriction and transient declamp hypotension after infrarenal aortic occlusion: Role of plasma purine degradation products  Richard S. Frank,

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Presentation on theme: "Renal vasoconstriction and transient declamp hypotension after infrarenal aortic occlusion: Role of plasma purine degradation products  Richard S. Frank,"— Presentation transcript:

1 Renal vasoconstriction and transient declamp hypotension after infrarenal aortic occlusion: Role of plasma purine degradation products  Richard S. Frank, B.S., Mohammed M. Moursi, M.D., Rachel M. Podrazik, M.D., Gerald B. Zelenock, M.D., Louis G. D'Alecy, D.M.D., Ph.D.  Journal of Vascular Surgery  Volume 7, Issue 4, Pages (April 1988) DOI: / (88) Copyright © 1988 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

2 Fig. 1 Representative oscillograph tracing of suprarenal and infrarenal aortic pressure and renal blood flow during infrarenal clamp application and release. Clamping initiates an increase in suprarenal pressure and renal flow and a decrease in infrarenal pressure to less than 25 mm Hg. Clamp release depresses suprarenal pressure and renal flow and restores infrarenal pressure. However, note that renal flow is persistently reduced despite increasing suprarenal and infrarenal pressure. Journal of Vascular Surgery 1988 7, DOI: ( / (88) ) Copyright © 1988 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

3 Fig. 2 Representative oscillograph tracing of suprarenal and infrarenal aortic pressure and renal blood flow during nonischemic clamp application and release is shown. Clamp application results in a slight reduction in suprarenal pressure, narrowing of infrarenal pulse pressure, and increase in renal blood flow. Clamp release reduces suprarenal and infrarenal pressure slightly and initiates an increase in renal blood flow. Journal of Vascular Surgery 1988 7, DOI: ( / (88) ) Copyright © 1988 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

4 Fig. 3 Time course of suprarenal and infrarenal aortic pressure, renal flow and resistance is shown during and after removal of ischemic clamp. Standard error bars not seen lie within the value symbol. The two darkened boxes represent that portion of the clamp period seen in Figs. 1 and 2. * = p < 0.05; ** = p < 0.005; *** = p < Journal of Vascular Surgery 1988 7, DOI: ( / (88) ) Copyright © 1988 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

5 Fig. 4 Proposed pathway of ATP breakdown in ischemia (from Fox IH. J Lab Clin Med 1985;106:102). Journal of Vascular Surgery 1988 7, DOI: ( / (88) ) Copyright © 1988 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

6 Fig. 5 Bar graph of plasma adenosine values for nonischemia group (n = 4) and ischemia group (n = 10). Journal of Vascular Surgery 1988 7, DOI: ( / (88) ) Copyright © 1988 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

7 Fig. 6 Bar graph of summed plasma purines (sum of adenosine, inosine, hypoxanthine, and xanthine) from both the ischemia group (n = 10) and the nonischemia group of dogs (n = 4). Note relatively constant purine level of nonischemia group and the statistically significant increase (p < 0.05) and steady fall-off of the purine level of the ischemia group. Journal of Vascular Surgery 1988 7, DOI: ( / (88) ) Copyright © 1988 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

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