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Local renal ischemia during burn shock in rat effected by thromboxane A2 and serotonin.
Circ Shock. 1986; 20(1):13-23.CS

Abstract

Intermittent patchy ischemia in the renal cortex during traumatic shock has previously been observed in dogs and rats. In recent experiments on rats a high rate of abrupt changes in local blood flow was observed after scalding. To try to reveal endogenous factors causing such ischemic episodes, we scalded six series of anesthetized rats (50% of body surface for 30 s in 80 degrees C water) and measured arterial pressure (AP), hematocrit (Hct), and local renal cortical blood flow (RCF). RCF was recorded by the local H2 washout technique. After scalding, RCF decreased markedly in all series whereas AP was relatively well preserved. In accordance with previous experiments, 11% of the washout curves recorded 0-75 min after scalding showed abrupt changes in local blood flow, rising to 27% during the next 60 min in drug-untreated rats. In contrast, blocking of serotonin S2 receptors with Ketanserin abolished the phenomenon. However, in rats treated with the prostaglandin synthesis blockers, indomethacin (general) or 3-ethyl pyridin (thromboxane A2 blocker), the phenomenon was observed in only 2-3% of the washout curves. Furthermore, after blocking the AngII receptors by saralasin or alpha receptors by phentolamine in separate series, the frequency of abrupt flow shifts was reduced in comparison to the frequency in untreated rats. The results indicate that intermittent, patchy vasoconstriction is mediated by serotonin and thromboxane A2 (TxA2), probably released from platelets. The occurrence of ischemic episodes also depends on the local AngII and alpha-adrenergic tonus present after scalding.

Authors

No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

3021355

Citation

Haugan, A, and A Kirkebø. "Local Renal Ischemia During Burn Shock in Rat Effected By Thromboxane A2 and Serotonin." Circulatory Shock, vol. 20, no. 1, 1986, pp. 13-23.
Haugan A, Kirkebø A. Local renal ischemia during burn shock in rat effected by thromboxane A2 and serotonin. Circ Shock. 1986;20(1):13-23.
Haugan, A., & Kirkebø, A. (1986). Local renal ischemia during burn shock in rat effected by thromboxane A2 and serotonin. Circulatory Shock, 20(1), 13-23.
Haugan A, Kirkebø A. Local Renal Ischemia During Burn Shock in Rat Effected By Thromboxane A2 and Serotonin. Circ Shock. 1986;20(1):13-23. PubMed PMID: 3021355.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Local renal ischemia during burn shock in rat effected by thromboxane A2 and serotonin. AU - Haugan,A, AU - Kirkebø,A, PY - 1986/1/1/pubmed PY - 1986/1/1/medline PY - 1986/1/1/entrez SP - 13 EP - 23 JF - Circulatory shock JO - Circ Shock VL - 20 IS - 1 N2 - Intermittent patchy ischemia in the renal cortex during traumatic shock has previously been observed in dogs and rats. In recent experiments on rats a high rate of abrupt changes in local blood flow was observed after scalding. To try to reveal endogenous factors causing such ischemic episodes, we scalded six series of anesthetized rats (50% of body surface for 30 s in 80 degrees C water) and measured arterial pressure (AP), hematocrit (Hct), and local renal cortical blood flow (RCF). RCF was recorded by the local H2 washout technique. After scalding, RCF decreased markedly in all series whereas AP was relatively well preserved. In accordance with previous experiments, 11% of the washout curves recorded 0-75 min after scalding showed abrupt changes in local blood flow, rising to 27% during the next 60 min in drug-untreated rats. In contrast, blocking of serotonin S2 receptors with Ketanserin abolished the phenomenon. However, in rats treated with the prostaglandin synthesis blockers, indomethacin (general) or 3-ethyl pyridin (thromboxane A2 blocker), the phenomenon was observed in only 2-3% of the washout curves. Furthermore, after blocking the AngII receptors by saralasin or alpha receptors by phentolamine in separate series, the frequency of abrupt flow shifts was reduced in comparison to the frequency in untreated rats. The results indicate that intermittent, patchy vasoconstriction is mediated by serotonin and thromboxane A2 (TxA2), probably released from platelets. The occurrence of ischemic episodes also depends on the local AngII and alpha-adrenergic tonus present after scalding. SN - 0092-6213 UR - https://www.unboundmedicine.com/medline/citation/3021355/Local_renal_ischemia_during_burn_shock_in_rat_effected_by_thromboxane_A2_and_serotonin_ DB - PRIME DP - Unbound Medicine ER -