Modest pressure natriuresis and autoregulation during water diuresis in dogs.

Blood vessels Pub Date : 1991-01-01 DOI:10.1159/000158890
W H Waugh
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Abstract

The effects of renal arterial pressure change on renal output of sodium and volume were measured during water diuresis in 25 chloralose-anesthetized dogs. Conditions included a minimal invasive stress, limited sodium administration, and mean renal arterial pressures varied suprarenally, by aortic balloon inflation to lowermost levels of 82-106 mm Hg. Group A dogs received no aldosterone; group B, C and D dogs were given aldosterone. Dogs of group C also received (1-Sar, 8-Ile)-angiotensin II. Group D dogs received phenylephrine which elevated arterial and right atrial pressures moderately without decrease in renal blood flow. In groups A, B and C, mean changes in sodium output, volume output, fractional excretions and free water clearances were not detectable with mean renal arterial pressure reductions, which averaged 29 +/- 2.9, 22 +/- 2.8 and 27 +/- 5.2 mm Hg, respectively. Right atrial pressures, effective renal blood flows and glomerular filtration rates did not change with the renal arterial pressure changes in these groups. In the group D dogs, during the larger pressure reductions of 54 +/- 6.6 mm Hg from higher values of 158 +/- 7.0 mm Hg, mean urine flow and effective renal blood flow remained constant while glomerular filtration rate and sodium output decreased only slightly. Output efficiency ratios related to perfusion pressure were calculated. With no more than modest pressure-induced excretory changes, it is concluded that excretory sodium and urinary volume autoregulation in concert with nearly perfect circulatory autoregulation were demonstrated with regionally varied mean renal arterial pressure. The same preglomerular myogenic responses to transvascular pressure, which restrict glomerular and transcapillary pressures, are viewed dominantly responsible for both circulatory and excretory autoregulation under normal conditions of minimal stress and low fractional sodium excretions. Homeostatic implications are discussed concerning likely relevance to the Guyton-Coleman theory for the long-term control of arterial blood pressure.

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狗在水利尿过程中的适度压力尿钠和自动调节。
测定了25只氯氯糖麻醉犬在水利尿过程中肾动脉压变化对肾钠输出量和肾容量的影响。条件包括微创应激,有限的钠给药,平均肾动脉压通过主动脉球囊膨胀变化到最低水平82-106毫米汞柱。a组狗不注射醛固酮;B、C、D组给予醛固酮。C组同时给予(1-Sar, 8-Ile)-血管紧张素II。D组给予苯肾上腺素,可适度升高动脉压和右心房压,但肾血流量未减少。在A、B和C组中,钠输出量、容积输出量、分数排泄量和游离水清除率的平均变化在平均肾动脉压降低(平均分别为29 +/- 2.9、22 +/- 2.8和27 +/- 5.2 mm Hg)时未被检测到。右心房压、有效肾血流量和肾小球滤过率不随肾动脉压变化而变化。在D组狗的血压从158 +/- 7.0 mm Hg的较高值下降54 +/- 6.6 mm Hg期间,平均尿流量和有效肾血流量保持不变,而肾小球滤过率和钠输出仅略有下降。计算与灌注压力相关的输出效率比。除了适度的压力引起的排泄变化外,我们得出结论,排泄钠和尿量的自我调节与近乎完美的循环自我调节一致,表现为区域平均肾动脉压的变化。同样的肾小球前肌生成反应对经血管压力的反应,限制了肾小球和经毛细血管压力,被认为是在最小应激和低钠排泄的正常条件下循环和排泄的自动调节的主要原因。体内平衡的影响讨论可能与盖顿-科尔曼理论长期控制动脉血压有关。
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