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RR Ghose FRCS DJ Palmer MRCP M Yaqoob MB BCh N Haboubi MRCPath WA Ratcliffe MRCPath 《International journal of clinical practice》1994,48(3):163-164
SUMMARY A 24-year-old man with anorexia, repeated bouts of vomiting, and wasting was found to have florid thyrotoxicosis and hypercalcaemia. Pamidronate promptly reduced the serum calcium concentration to normal, and simultaneously abated the abdominal symptoms, which did not recur in spite of continuing severe hyperthyroidism, which was eventually controlled by radioactive iodine ablation of thyroid activity. 相似文献
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The role of pertussis toxin-sensitive guanine nucleotide regulatory proteins (G-proteins) in the signal transduction process(es) involved in postjunctional vascular alpha 1-adrenoceptor-mediated vasoconstriction produced by the full agonist, cirazoline, and the partial agonist, (-)-dobutamine, have been investigated in the cardiovascular system of the pithed rat. Pertussis toxin pretreatment (50 micrograms/kg, iv, 3 days prior to experimentation) only slightly inhibited the pressor response of cirazoline, and the degree of inhibition produced by pertussis toxin was roughly equivalent to the inhibition produced by the calcium channel antagonist, nifedipine (1 mg/kg, ia). In contrast, pertussis toxin pretreatment produced marked inhibition of the alpha 1-adrenoceptor-mediated pressor response to the partial agonist, (-)-dobutamine, and this large degree of inhibition was qualitatively and quantitatively similar to the degree of inhibition produced by nifedipine. The differential pattern of inhibition of full and partial alpha 1-adrenoceptor agonists by pertussis toxin suggests that the vasoconstrictor response of an alpha 1-adrenoceptor partial agonist, which is more dependent upon the translocation of extracellular calcium than a full agonist, as evidenced by its sensitivity to inhibition by nifedipine, involves a pertussis toxin-sensitive G-protein that couples the alpha 1-adrenoceptor to the calcium channel. Furthermore, for alpha 1-adrenoceptor-mediated vasoconstriction by full agonists with high intrinsic efficacy, which involves both intracellular and extracellular pools of calcium, and particularly the former, pertussis toxin only inhibits that component of the alpha 1-adrenoceptor response which is dependent upon the translocation of extracellular calcium, accounting for the limited degree of inhibition of the response to cirazoline by pertussis toxin and by nifedipine. By inference, the other component of the alpha 1-adrenoceptor-mediated pressor response to a full agonist, which is dependent upon the mobilization of intracellular stores of calcium through a process believed to involve the activation of phospholipase C, likely utilizes a pertussis toxin insensitive G-protein that is distinct from that which we propose couples the alpha 1-adrenoceptor to the calcium channel. We conclude, therefore, that the alpha 1-adrenoceptor in the vasculature of the pithed rat may be coupled to 2 distinct G-proteins, only one of which is sensitive to inhibition by pertussis toxin and links the alpha 1-adrenoceptor to the membrane calcium channel, and which may be utilized by both full agonists and partial agonists. 相似文献
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实验观察了阿斯匹林精氨酸(AAs)对兔缺血心室肌不应期(ERP)和室颤阈(VFT)的影响。结果表明,阻断冠脉50min时,血小板聚集率(PAgR)增大11±5%,VFT降低24±3mA;缺血边缘区ERP较缺血10 min时缩短20±10 ms,缺血中心区延长35±12 ms,两区间不应期离散性(Di)增加52±17ms,各数值均与对照值差异显著(p<0.01)。阻断冠脉前0.5 hⅳAAs,上述参数变化明显减轻,与单纯阻断组缺血50 min时各数值变化相比,均p<0.01。结果提示,AAs具有抑制PAgR、减小Di和提高VFT的作用。 相似文献
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B. ALLOLIO H. DÖRR R. STUTTMANN D. KNORR D. ENGELHARDT W. WINKELMANN 《Clinical endocrinology》1985,22(3):281-286
In a prospective controlled trial we investigated the effect of an induction dose of etomidate (0.26 mg/kg i.v.) on plasma ACTH, progesterone, 17 alpha OH-progesterone, 11-deoxycortisol, cortisol, cortisone, corticosterone, 11-deoxycorticosterone, and aldosterone in seven males undergoing general anaesthesia. Seven other male patients receiving thiopentone at induction (5.0 mg/kg i.v.) served as controls. Plasma ACTH concentrations rose higher in the etomidate group (346 +/- 124 vs. 117 +/- 74 pg/ml, mean +/- SEM), but the difference was not significant. After etomidate we found a clear suppression of plasma cortisol (P less than 0.01), cortisone (P less than 0.01), corticosterone (P less than 0.01), and aldosterone (P less than 0.05) compared to corticosteroid levels after induction with thiopentone. Plasma 11-deoxycortisol and 11-deoxycorticosterone concentrations were grossly elevated 210 min after etomidate (91 +/- 28 nmol/l and 7.04 +/- 0.47 nmol/l, respectively, P less than 0.01) demonstrating inhibition of 11 beta-hydroxylation of both glucocorticoid and mineralocorticoid intermediates. In contrast, no significant difference in plasma progesterone and 17 alpha-OH-progesterone levels was found between the two groups indicating that the cholesterol-side-chain cleavage enzyme is less sensitive to etomidate than 11 beta-hydroxylase. Our results suggest that after induction of anaesthesia with a single bolus of etomidate, inhibition of other enzymes in the corticosteroid-synthetic pathway (e.g. cholesterol-side-chain cleavage enzyme) is of little clinical relevance. 相似文献
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Small Intestinal Bacterial Overgrowth in the Symptomatic Elderly 总被引:1,自引:0,他引:1
Stephen M. Riordan M.B.B.S. M.D. F.R.A.C.P. Christopher J. McIver B.App.Sc. Ph.D. Denis Wakefield M.B.B.S. M.D. F.R.A.C.P. F.R.C.P.A. Terry D. Bolin M.B.B.S. F.R.C.P. F.R.C.P. F.R.A.C.P. M.D. D.C.H. Vic M. Duncombe M.O. M.Sc. F.R.A.C.P. Mervyn C. Thomas M.B.B.S. M.Sc. RR.A.C.P. 《The American journal of gastroenterology》1997,92(1):47-51
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