Huisman and de Zeeuw consider that the acute haemodynamic events which follow renal artery stenosis may be due to spasm and subsequent relaxation of the renal artery, and disagree with our explanations [l, 21. In addition, they suggest that baroreceptor reflexes are responsible for the absence of a rise in arterial pressure after complete occlusion of the renal artery and reject our simple hydraulic explanation. We believe that these alternative explanations, though plausible, are incorrect.

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