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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.

Thoracic aortic aneurysm

Cardiology · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

RapidFull
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Escalate

Abrupt severe chest, back or interscapular pain, pulse/BP asymmetry, neurological deficit, syncope, acute aortic regurgitation or shock suggests acute aortic syndrome rather than uncomplicated aneurysm: activate the acute aortic pathway and obtain immediate specialist imaging/advice.

Synopsis

Recognise thoracic aortic dilatation, identify heritable and valve-associated disease, plan imaging surveillance and know when urgent or surgical review is needed.

  • Thoracic aortic aneurysm is usually silent and found on echocardiography, CT or MRI; symptoms may reflect compression, valve disease or impending complication.
  • Confirm the involved segment and obtain reproducible orthogonal measurements; echocardiography assesses the root/ascending aorta and valve, while CT or MRI maps the whole thoracic aorta.
  • At diagnosis, look for bicuspid aortic valve, coarctation, syndromic features and a family history of thoracic aneurysm, dissection or sudden unexplained death.
  • The 2024 ESC guideline recommends surgery for an ascending aortic aneurysm at a maximal diameter of at least 55 mm in the usual non-heritable setting.
  • Lower intervention thresholds may apply in heritable aortopathy, bicuspid valve with additional risk factors, rapid growth, pregnancy planning, small body size or when valve surgery is already planned.
  • A symptomatic aneurysm or rapid enlargement needs expedited aortic-team review regardless of a routine surveillance date.
  • Control blood pressure, stop smoking and avoid extreme isometric strain; the specific drug and target must reflect comorbidity and any genetic syndrome.
  • Acute dissection is a time-critical separate pathway: do not label sudden pain as a stable aneurysm symptom.

Key red flags

Acute aortic syndrome

Abrupt maximal-at-onset chest/back pain, migrating pain, pulse deficit, focal neurology, syncope, shock or new diastolic murmur requires emergency assessment.

Rapid change

New symptoms or credible interval enlargement beyond expected measurement variability should trigger earlier cross-sectional imaging and aortic-team review.

Investigation priorities

01
Transthoracic echocardiographyFirst step

Measure the root/proximal ascending aorta and assess aortic valve morphology, regurgitation and LV response.

Management branches

emergencyPossible acute aortic syndrome

Sudden severe chest/back pain or aneurysm plus neurological, perfusion, valve or shock features.

  1. First: immediate ABC assessment, monitoring, IV access, analgesia and senior cardiothoracic/vascular contact.
  2. Next: urgent ECG-gated CTA from chest through the aorta when feasible; use TOE/MRI only when clinically appropriate and without harmful delay.
  3. Next: begin monitored anti-impulse therapy under the acute aortic team when hypertensive, generally controlling heart rate before adding vasodilation.
  4. Escalation: type A dissection requires emergency surgical evaluation; complicated type B disease needs urgent specialist endovascular/surgical assessment.
surveillanceStable aneurysm follow-up

Below an intervention threshold and without acute features.

  1. First: record the same anatomical landmarks and measurement convention for every study.
  2. Next: optimise BP and other CVD risks; advise smoking cessation and avoidance of extreme straining/heavy isometric lifting.
  3. Next: repeat imaging at the specialist-set interval, sooner when close to a threshold or growth is suspected.
  4. Escalation: bring review forward for new pain, valve symptoms, pregnancy plans or interval enlargement.

Key medicines

Beta-blocker (example: bisoprolol)For the licensed hypertension indication, a typical bisoprolol regimen starts at 5 mg orally once daily; the usual dose is 10 mg once daily and the SmPC maximum is 20 mg once daily. An aortopathy specialist may select a lower start according to heart rate and BP.Individualise to heart rate and comorbidity; avoid or use specialist caution with marked bradycardia, heart block, decompensated heart failure or severe bronchospasm. Do not exceed 10 mg/day in severe renal or hepatic impairment under the cited SmPC. This is not acute-dissection dosing.
Losartan50 mg orally once daily, increased to 100 mg once daily if required and tolerated.Monitor creatinine/eGFR and potassium; avoid in pregnancy and do not combine routinely with an ACE inhibitor.
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Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • 2024 ESC Guidelines for peripheral arterial and aortic diseasesCurrent European aortic imaging, surveillance and intervention framework.
  • 2024 ESC PAAD full guidelineDetailed thoracic aortic recommendations and tables.
  • NHS Royal Brompton & Harefield: AortopathyUK specialist-service context for thoracic aortic enlargement.
  • eMC: Losartan SmPCDose and safety information.
  • eMC: Bisoprolol fumarate SmPCLicensed hypertension dose, maximum and organ-impairment cautions.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom