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Failure of Doppler ultrasound to detect coarctation of the aorta
P J Scott1, G A Wharton, J L Gibbs
1Non-invasive Heart Unit, Killingbeck Hospital, Leeds, West Yorkshire, U.K.
Insights
Normal flow velocities in the aortic arch do not rule out aortic coarctation. This condition, despite normal Doppler ultrasound findings, can present with significant pressure differences and collateral circulation.
Area of Science:
- Cardiovascular medicine
- Medical imaging
- Diagnostic techniques
Background:
- Aortic coarctation is a congenital heart defect characterized by narrowing of the aorta.
- Doppler ultrasound is commonly used for diagnosing aortic coarctation.
- Clinical signs may suggest coarctation despite potentially normal initial imaging findings.
Observation:
- A patient with clinical signs of aortic coarctation showed normal flow velocities in the aortic arch via Doppler ultrasound.
- Angiography revealed complete coarctation with extensive collateral circulation to the descending aorta.
- A significant systolic pressure gradient of 40 mm Hg was measured between the ascending and descending aorta.
Findings:
- Normal flow velocities on Doppler ultrasound do not exclude the presence of significant aortic coarctation.
- Extensive collateral circulation can maintain normal flow dynamics in the aortic arch despite a severe obstructive lesion.
- A substantial pressure difference across the coarctation site is a key indicator of severity.
Implications:
- Clinicians should consider coarctation of the aorta even with normal Doppler velocities in the aortic arch.
- Angiography remains crucial for definitive diagnosis and assessment of collateralization in suspected cases.
- This case highlights the limitations of relying solely on flow velocity measurements for diagnosing aortic coarctation.
Abstract:
Normal velocities of flow in the aortic arch were recorded in a patient presenting with clinical signs of aortic coarctation. Angiography demonstrated complete coarctation with extensive collateral supply to the descending aorta: there was a systolic pressure difference of 40 mm Hg between the ascending and descending segments of the aorta. Despite reports of the value of Doppler ultrasound in the diagnosis of coarctation, the finding of normal velocities of flow within the aortic arch does not necessarily exclude the presence of an obstructive lesion.