Overview
Absence of renin secretion refers to a condition where the kidneys fail to produce renin, a key enzyme in the renin-angiotensin-aldosterone system (RAAS). This can lead to impaired regulation of blood pressure and fluid balance, often observed in specific renal pathologies or pharmacological interventions targeting renin inhibition.Diagnosis
Elevated plasma renin activity (PRA) in focal lesions: Segmental renal vein catheterization can identify increased renin production from focal renal lesions 2.
Hypotension and bradycardia with renin inhibition: Profound hypotension and bradycardia may occur in sodium-depleted subjects during high-dose renin inhibition, indicating potential idiosyncratic responses or severe RAAS disruption 1.Management
Targeted surgical intervention: For focal renin-producing lesions, surgical resection of the affected renal segment can cure hypertension 2.
Renin inhibitors: Use caution with high doses of renin inhibitors, especially in sodium-depleted states, due to risk of severe hypotension and bradycardia 1.Special Populations
Sodium-depleted states: Higher susceptibility to adverse effects from renin inhibitors, including profound hypotension and bradycardia 1.Key Recommendations
Consider segmental renal vein catheterization in hypertensive patients with suspected focal renal renin-producing lesions for precise diagnosis and guiding surgical intervention (Evidence: Moderate 2).
Exercise caution with high-dose renin inhibitors in sodium-depleted patients due to risk of severe hypotension and bradycardia (Evidence: Weak 1).
Monitor closely for cardiovascular responses when administering renin inhibitors, especially in patients with baseline elevated angiotensin II levels (Evidence: Expert opinion).References
1 Webb DJ, Manhem PJ, Leckie BJ, Lever AJ, Morton JJ, Robertson JI et al.. Severe hypotension with bradycardia during renin inhibition with H142 in sodium deplete man. Journal of human hypertension 1989. link
2 Lindstrom RR, Brosman SA, Paul JG, Bennett CM, Connor G, Barajas L. Segmental intrarenal catheterization in renin-mediated hypertension. The Journal of urology 1977. link57867-2)