Thoracic Aortic Aneurysm / Suspected Acute Aortic Dissection

What is a thoracic aortic aneurysm (TAA)?

A weakening and dilation of the thoracic aorta that can dissect or rupture and become life-threatening.

How should a symptomatic thoracic aortic aneurysm be treated prehospital?

Treat as suspected acute aortic dissection (time-critical emergency).

What is the classic pain description in thoracic aortic dissection?

Sudden severe 'tearing', 'ripping', 'stabbing' chest or back pain.

Where is pain commonly felt in thoracic aortic dissection?

Chest, upper back (between shoulder blades), or upper abdomen.

What is a key clue in aortic dissection pain onset?

Pain is sudden and maximal at onset.

What is a major risk factor for thoracic aortic aneurysm/dissection?

Hypertension.

What are other risk factors for thoracic aortic aneurysm/dissection?

Older age, male sex, known aneurysm, Marfan syndrome, atherosclerosis, cocaine use, pregnancy, previous cardiac surgery.

What are red flags for acute aortic dissection?

Sudden tearing pain, unequal pulses, BP difference between arms, neuro deficits, syncope, shock.

What pulse finding is concerning in thoracic aortic dissection?

Unequal radial pulses (pulse deficit).

What BP finding is concerning in thoracic aortic dissection?

Different blood pressure between arms.

Why can thoracic aortic dissection be mistaken for ACS?

It causes severe chest pain and ECG changes may mimic STEMI.

What should always be performed in suspected thoracic aortic dissection?

12-lead ECG.

Does a normal ECG exclude aortic dissection?

No.

What are the first management steps (QAS)?

DRABCDE, cardiac monitor, IV access, 12-lead ECG, observations, analgesia, urgent transport.

Why minimize movement in suspected thoracic aortic dissection?

To reduce cardiovascular stress and worsening dissection.

When should oxygen be given?

Only if clinically indicated (hypoxia/respiratory distress).

Should oxygen be given routinely?

No.

Why is analgesia important in aortic dissection?

Reduces pain and sympathetic drive, lowering aortic wall stress.

What analgesia principle is used in QAS?

Follow QAS analgesia protocol according to scope of practice.

What should be monitored after opioid analgesia?

Respiratory depression, hypotension, sedation.

How should IV fluids be given?

Judiciously/cautiously.

When are IV fluids indicated?

Hypotension or poor perfusion/shock.

Why avoid excessive IV fluids?

May worsen cardiovascular stress.

What neurological symptoms may occur in thoracic aortic dissection?

Weakness, paralysis, stroke-like symptoms, altered LOC.

What are signs of poor perfusion in thoracic aortic dissection?

Pale, clammy skin, hypotension, altered LOC, shock.

What are common vital sign findings?

Hypertension early, tachycardia, hypotension late.

What is a common presentation trap?

Assuming ACS automatically.

What does sudden tearing chest pain + neuro deficits suggest?

Acute aortic dissection until proven otherwise.

What does sudden chest pain + unequal pulses suggest?

Acute aortic dissection.

How is ACS pain usually described?

Pressure, tightness, heaviness.

How is aortic dissection pain usually described?

Tearing, ripping, sharp, maximal at onset.

What are common differential diagnoses?

ACS, pulmonary embolism, pneumothorax, stroke, cardiac tamponade.

Why is thoracic aortic dissection time critical?

Risk of rupture, haemorrhage, stroke, tamponade, shock, death.

When should CCP/advanced support be considered?

Haemodynamic instability, airway compromise, severe uncontrolled pain, deterioration.

What is the transport priority?

Urgent transport with pre-notification if unstable.

What is the QAS treatment summary?

DRABCDE → monitor → 12-lead ECG → IV access → analgesia → oxygen if indicated → cautious fluids → urgent transport.

What is a memory trick for aortic dissection?

RIP = Ripping pain, Inequal pulses/BP, Perfusion problems.

What causes pain in aortic dissection?

A tear in the aortic wall allowing blood into vessel layers.

What happens if thoracic aortic aneurysm ruptures?

Massive internal haemorrhage and circulatory collapse.

What is a key one-line recall for exams?

Sudden tearing chest/back pain + unequal pulses/BP + neuro signs = acute aortic dissection until proven otherwise.