CTA of the Abdomen for Uncontrolled Hypertension

Primary Diagnostic Target: Renal Artery Stenosis

The American College of Radiology recommends CTA for detecting renal artery stenosis, a potentially reversible secondary cause of hypertension, with sensitivity and specificity approaching 98-99% for detecting stenoses greater than 50% 3, 1, 2
The prevalence of renal artery stenosis among hypertensive patients is approximately 4.3% in chronic kidney disease populations, though it can be as high as 19.2% in hypertensive patients with concurrent coronary artery disease 1

CTA provides detailed anatomic depiction of the renal arteries and abdominal aorta before potential percutaneous angiography or surgical intervention, enabling extensive image postprocessing 5, 2, 6
The volumetric acquisition enables creation of an arterial roadmap for treatment planning, including visualization of collateral vessels and arteries distal to occlusions 6

CTA can identify other vascular causes of secondary hypertension, including renal artery thrombosis, arterial injury, pseudoaneurysms, and arteriovenous fistulas 5, 7
The abdominal component allows simultaneous evaluation of the abdominal aorta and upper abdominal organs for additional pathology 5, 2

The American College of Radiology suggests that the risk-benefit ratio must be carefully evaluated in patients with renal impairment, as contrast administration carries nephrotoxicity risk 4, 8
Heavily calcified vessels can limit interpretation of CTA, particularly in elderly patients, diabetics, and those on dialysis, though dual-energy CTA can reduce blooming artifacts 6
CTA is typically considered after initial ultrasound evaluation is unremarkable or indeterminate, following a stepwise diagnostic approach 5, 2
Arteriography remains reserved for intervention rather than initial diagnosis, with CTA serving as the primary noninvasive diagnostic tool 1, 4