Acute aortic dissection is one of the most dangerous emergencies encountered in hospital practice. Although comparatively uncommon, it can become fatal within hours if not recognised and treated promptly. It is a time-critical vascular emergency where delay can significantly affect survival and long-term outcome. For that reason, missed or delayed diagnosis of aortic dissection is a serious issue in clinical negligence claims in England and Wales.
The challenge for clinicians is that its early symptoms often resemble far more common conditions, such as heart attack, pulmonary embolism, stroke, kidney stones, or severe back pain. Because of that overlap, aortic dissection remains a recurring feature in emergency negligence claims, particularly where delays in A&E assessment and diagnosis allow the condition to progress unnecessarily.
These cases usually focus on timing from a legal perspective. In other words, if the warning signs were present and earlier investigation or referral would probably have produced a better outcome, compensation may be available.
To explore the issue further, this article will provide detailed answers to six questions:
- What is acute aortic dissection?
- Why is the diagnosis often missed?
- How should emergency clinicians investigate suspected cases?
- What cases would qualify as clinical negligence?
- How can I make a claim?
- What compensation am I entitled to?
What Is Acute Aortic Dissection?
The aorta is the largest artery in the body. It carries oxygenated blood from the heart to the brain, organs, and limbs. In an aortic dissection, a tear develops in the inner lining of the vessel. Blood then forces its way between the layers of the aortic wall, creating a false channel known as a false lumen.
That process can rapidly weaken the artery, obstruct blood flow to major organs, or cause the vessel to rupture. Any of those complications may be fatal without urgent treatment. The condition can also compromise blood supply to the heart, brain, spinal cord, kidneys, bowel or limbs, which is why symptoms may vary considerably from patient to patient.
Dissections are commonly divided using the Stanford classification:
- Type A: Involves the ascending aorta (the section nearest the heart). This is usually a cardiothoracic surgical emergency.
- Type B: Limited to the descending aorta. These cases are often managed with blood pressure control and monitoring, although endovascular or surgical intervention may be required if complications develop.
Type A dissections are particularly serious because they may lead to cardiac tamponade, severe aortic valve failure, stroke, myocardial ischaemia, or sudden collapse. They usually require immediate specialist input because, without timely surgery, the risk of death can rise rapidly. Naturally, these cases may also overlap with broader cardiology compensation claims.
Certain patients are at higher risk, including those with…
- longstanding hypertension;
- known aortic aneurysm;
- connective tissue disorders (e.g. Marfan syndrome or Ehlers-Danlos syndrome);
- bicuspid aortic valve disease;
- previous aortic surgery;
- family history of aortic disease;
- pregnancy or the postpartum period;
- some forms of stimulant drug use.
A known risk factor does not have to be present for dissection to occur, but its presence should usually heighten clinical suspicion.
Why the Diagnosis Is Often Missed
As mentioned, acute aortic dissection is frequently missed because it can imitate several far more common emergencies. In the early stages, the presentation may appear entirely consistent with myocardial infarction, pulmonary embolism, stroke, pancreatitis, renal colic, or musculoskeletal pain.
Emergency clinicians naturally see those conditions more often, which can make a rarer diagnosis harder to prioritise. However, rarity does not remove the need to consider dissection where the history, examination, or risk profile contains recognised red flags. The issue in a negligence claim is not whether the diagnosis was difficult, but whether a reasonably competent clinician should have considered and investigated it in the circumstances.
Symptom Overlap
The classic description is sudden tearing chest pain radiating to the back; however, many patients do not present in that textbook manner.
Symptoms may include:
- Sudden chest pain
- Severe upper back pain
- Pain of abrupt onset or pain described as maximal at onset
- Migrating pain, for example pain moving from the chest to the back or abdomen
- Syncope or collapse
- Neurological deficit
- Abdominal pain
- Shortness of breath
- Acute heart failure
- Leg pain or limb weakness
- Confusion or reduced consciousness
- Unexplained sweating, pallor or a sense of impending collapse
- Symptoms suggesting reduced blood flow to an organ or limb (e.g. reduced blood supply to the kidneys, resulting in kidney failure)
Those symptoms may be attributed – sometimes plausibly – to more common diagnoses. For example, chest pain may be managed initially as a heart attack, neurological symptoms as stroke, or back pain as a spinal problem. Some cases involving missed cardiac symptoms may later form part of misdiagnosed heart condition claims.
A particular danger arises when one plausible diagnosis is accepted too early and the possibility of dissection is not revisited as symptoms evolve or new information becomes available. This is sometimes referred to as “anchoring”, where clinicians remain fixed on an early diagnosis despite later signs pointing elsewhere.
Examination Limitations
While clinical examination can assist, no single sign excludes dissection. Possible findings include:
- A difference in blood pressure between arms
- Absent or reduced peripheral pulses
- A new diastolic murmur from aortic regurgitation
- Signs of shock
- Neurological deficit
- Features of limb or organ ischaemia.
Importantly, these signs may also be absent.
Their presence can raise suspicion, but their absence does not safely rule the condition out. A normal pulse examination, normal blood pressure in both arms, or a normal chest examination cannot, by itself, exclude acute aortic dissection.
Non-Specific Tests
Initial investigations can be normal or misleadingly abnormal.
- ECG: May be normal, show non-specific changes, or mimic myocardial infarction.
- Chest X-ray: Can appear normal or show only subtle widening of the mediastinum.
- Troponin: May rise if the coronary arteries are affected, leading clinicians towards an acute coronary syndrome pathway.
- D-dimer: May be elevated, but it is non-specific and not a definitive exclusion tool in isolation.
Over-reliance on these tests can delay the imaging that actually confirms or excludes dissection. Where clinical suspicion remains significant, normal or equivocal initial tests should not prevent escalation to definitive imaging.
A diagnosis of heart attack, pulmonary embolism, or stroke should not automatically close off consideration of dissection where the presentation remains unusual or high-risk.
Human and System Factors
Emergency decisions are made under pressure, meaning that diagnostic delay could also be linked to:
- Anchoring on an initial diagnosis
- Premature closure once a common explanation is found
- Emergency department crowding
- Delay in senior review
- Limited overnight imaging access.
- Slow transfer to specialist centres
- Poor handover between teams
- Incomplete documentation of pain onset,
- Failure to act on abnormal observations
- Delay in recognising deterioration
- Lack of clear pathways for urgent CT aortography or specialist referral.
How Suspected Aortic Dissection Should Be Managed
When clinicians suspect aortic dissection, prompt recognition and escalation are essential. A defensible pathway usually involves clear reasoning and timely referral.
Early Clinical Assessment
Early assessment should involve a careful clinical history and focused examination. Particular attention is usually given to the onset, severity, and progression of pain, especially where symptoms began suddenly or moved (e.g. from the chest to the back).
Clinicians should also consider associated features such as collapse, neurological symptoms, limb ischaemia, or other signs that blood flow to vital organs may be compromised.
Where red flags are present, senior input is often expected. The working diagnosis and differential diagnosis should be documented clearly, including why dissection has been considered or excluded.
Risk factors – such as previous aortic intervention or family history – should also be recorded and factored into the urgency of investigation. A good record should show why alternative serious diagnoses were rejected, not only what diagnosis was reached.
Immediate Treatment
While investigations are arranged, early management may include:
- Strong analgesia
- Heart rate control
- Continuous monitoring.
- Large-bore intravenous access.
- Blood pressure reduction (where appropriate)
- Cross-matching blood (if deterioration is possible)
The aim is to reduce stress on the aortic wall while definitive treatment is organised. In suspected Type A dissection, definitive management usually requires urgent cardiothoracic input. In complicated Type B dissection, vascular specialist input may be required urgently. Treatment decisions will depend on the patient’s stability, imaging findings, and specialist advice, but delay in escalation can be critical.
Definitive Imaging
For most patients, the investigation of choice is CT aortography. It is quick, widely available, and usually identifies the site and extent of dissection.
Depending on the circumstances, additional imaging may include transoesophageal echocardiography (in unstable patients) or transthoracic echocardiography (where tamponade is suspected). Similar complications may also arise following thoracoabdominal aortic aneurysm surgery.
In rare cases, MRI may be used in stable patients where alternative imaging is unsuitable or further anatomical detail is required.
The need for renal function checks, contrast considerations, or radiology discussion should not cause avoidable delay where the clinical situation is critical. If imaging is delayed or unavailable locally, escalation and transfer arrangements should be considered promptly. Where CT aortography is requested, the clinical urgency should be made clear to radiology and documented.
Escalation and Transfer
Once suspicion is significant or the diagnosis is confirmed, urgent referral should be made to cardiothoracic or vascular specialists.
Some hospitals cannot provide definitive treatment on site, meaning rapid transfer to a tertiary centre is required. Accurate, time-stamped communication between teams can become highly important in negligence claims where delay is alleged.
Records should ideally show when…
- dissection was first suspected;
- imaging was requested;
- imaging was performed and reported;
- specialist advice was sought;
- transfer or surgery was arranged.
In many claims, the chronology is central. Ambulance transfer times, acceptance by the receiving centre and theatre availability may also become important evidence.
When Delays May Amount to Clinical Negligence
Not every missed diagnosis is negligent. Emergency clinicians often work with incomplete information and some patients present atypically. However, compensation may be available where care fell below a reasonable standard and caused avoidable harm.
Four legal elements typically need to be established:
1. Duty of Care
Hospitals and treating clinicians owe patients a duty to provide competent medical care.
2. Breach of Duty
The claimant must show that the standard of care fell below that expected of a reasonably competent clinician.
3. Causation
It must then be shown that earlier recognition would probably have led to faster treatment and a materially better outcome.
That may involve survival where death occurred, avoidance of stroke, reduced organ damage, and various other cases of avoidable damage. In some patients, delayed treatment may lead to serious stroke complications or even long-term brain injury.
Causation is often the most contested issue in aortic dissection claims because the condition can progress rapidly even with treatment. Independent expert evidence is usually required to address whether earlier diagnosis would probably have changed the outcome.
Relevant questions may include whether surgery would have been performed sooner, whether the patient would have survived, whether neurological injury could have been avoided, or whether organ damage, limb ischaemia, or prolonged intensive care would have been reduced.
4. Damage
Compensation may reflect physical injury, psychological trauma, financial loss, care needs, loss of earnings, or bereavement in fatal negligence claims. In fatal cases, families may also need to go through the inquest process after suspected clinical negligence.
Where the patient survives, damages may also account for reduced stamina, long-term medication, surveillance imaging, future surgery risk, restrictions on employment, and the psychological impact of a near-fatal event.
Evidence That Often Decides a Claim
The strongest cases usually depend on detailed records and accurate chronology. Important evidence may include:
- Ambulance notes and response times
- Emergency department triage records
- Medical notes recording symptoms and examination findings
- Observation charts and NEWS scores.
- ECGs and blood results
- Imaging requests, scans, and reports.
- Referral and transfer logs
- Theatre and operative notes
- Complaint responses
- Internal investigation findings
- NHS 111 call records
- GP or out-of-hours records
- Cardiology, cardiothoracic or vascular specialist advice notes
- Intensive care records
- Rehabilitation records
- Witness statements from family members
- Coroner’s documents, where a death has occurred
Because outcomes may depend on hours rather than days, exact timings are often critical. A clear timeline can help determine whether there was an avoidable delay and whether that delay made a material difference. In many cases, the difference between a defensible and indefensible outcome lies in what was known at a particular time and what should reasonably have happened next.
Compensation & Long-Term Impact
Survivors of aortic dissection may face prolonged recovery, major surgery, repeat admissions, lifelong scans, medication, reduced stamina, and significant psychological distress after a near-fatal event.
Some patients require further procedures for residual disease in the descending aorta. Others are left unable to return to previous employment or daily activities.
Compensation can include damages for pain and suffering, together with losses such as:
- Past and future earnings
- Treatment costs
- Rehabilitation
- Care and assistance
- Travel expenses
- Adapted accommodation or equipment
- Future medical needs
- Case management
- Counselling or psychological therapy
- Pension loss
- Loss of services, including household and childcare support
- Future private treatment, where reasonable and supported by expert evidence
In fatal cases, claims may also arise on behalf of the estate or eligible dependants. This may include the deceased’s pain and suffering before death, funeral expenses, financial dependency, services dependency, and – where the statutory criteria are met – a bereavement award.
Making an Aortic Dissection Negligence Claim
If you or a loved one suffered harm because an aortic dissection was missed or treated too late, specialist legal advice can help establish whether negligent care played a role.
Our clinical negligence solicitors can obtain the records, instruct independent experts, and advise whether you have grounds to pursue compensation. Contact our team today for confidential advice.