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Renal Artery Stenosis. RUS nl, captopril renal radionucleotide scan revealed unilateral renal artery stenosis. Renal aretery narrowing causes release of renin, resulting in vasoconstriction in efferent arterioles and systemic vasoconstriction. Fibrodysplastic lesions are most common renovascular abnormality identified. Preterm neonates who have HTN frequently have undergone umbilical artery catheterization that causes emboli to renal a. Within this age group, 60-80% of have renal disease. Look for abdominal bruits, secondary sexual characteristics.
14 mo male with increased WOB, increased RR. Hx of asthma. On PE: HR 150, RR 66, BP 120/83, alert but tachypneic, 2/6 systolic murmur. Femoral pulses 2+, Liver edge is palpable. Echo shows LVH. CBC, U/A, CMP, BUN, creatinine wnl. CXR with cardiomegaly. Plasma renin activity and aldosterone levels elevated.