Case Presentation
A 62-year-old man presents with sudden, severe chest pain that began while lifting a heavy box approximately 30 minutes ago.
He describes the pain as:
“The worst pain of my life. It felt like something ripped through my chest into my upper back.”
The pain reached maximum intensity immediately and has remained severe. He reports diaphoresis, nausea, shortness of breath, weakness, and new numbness in his left arm.
Medical history includes:
- Poorly controlled hypertension
- Dyslipidemia
- Tobacco use
- Known ascending thoracic aortic aneurysm measuring 4.9 cm
- Family history of sudden unexplained death in his father at age 58
Current medications:
He admits that he frequently misses his antihypertensive medication.
Vital signs:
Measurement Right side Left side
Blood 196/108 mmHg 162/92 mmHg pressure
Radial pulse Strong Reduced
Additional vital signs:
- Heart rate: 112 beats/min
- Respiratory rate: 24 breaths/min
- Oxygen saturation: 95% on room air
- Temperature: 36.7°C
Physical examination:
- Pale, anxious, and diaphoretic
- Severe ongoing chest and upper-back pain
- New early diastolic decrescendo murmur along the left sternal border
- Reduced left radial pulse
- Mild weakness of the left arm
- Lungs initially clear
- No reproducible chest-wall tenderness
Sudden severe chest or back pain, neurologic symptoms, pulse abnormalities, syncope, dyspnea, and signs of shock may occur during an acute aortic emergency. Acute aortic dissection is life-threatening and requires immediate emergency assessment.
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Disease Overview & Exam Traps
Disease Overview
Primary Diagnosis
Acute Stanford type A, DeBakey type I aortic dissection with acute aortic regurgitation and branch-vessel malperfusion
Definition
An aortic dissection occurs when blood enters the aortic wall, usually through an intimal tear, and separates layers of the vessel wall.
This may create:
- A true lumen
- A false lumen
- Progressive extension along the aorta
- Branch-vessel obstruction
- Organ ischemia
- Aortic rupture
The aorta supplies the brain, upper extremities, heart, spinal cord, abdominal organs, kidneys, and lower extremities. A dissection may therefore produce widely variable symptoms.
Major Risk Factors
- Chronic hypertension
- Thoracic aortic aneurysm
- Family history of aortic disease
- Marfan syndrome
- Loeys–Dietz syndrome
- Vascular Ehlers–Danlos syndrome
- Bicuspid aortic valve
- Aortic coarctation
- Turner syndrome
- Heritable thoracic aortic disease
- Advanced age
- Atherosclerotic vascular disease
- Smoking
- Inflammatory aortic disease
- Pregnancy-associated aortic stress in susceptible patients
- Major blunt trauma
- Previous cardiac or aortic procedures
Hypertension and genetic or congenital aortic disorders are important risk factors. A detailed family history and genetic evaluation may be indicated in selected patients.
Common Clinical Features
- Sudden severe chest pain
- Severe upper- or interscapular back pain
- Pain maximal immediately at onset
- Tearing, ripping, sharp, or stabbing pain
- Syncope
- Diaphoresis
- Shortness of breath
- Pulse deficit
- Blood-pressure difference between limbs
- New aortic-regurgitation murmur
- Focal weakness or stroke symptoms
- Altered mental status
- Limb ischemia
- Abdominal pain from mesenteric ischemia
- Reduced urine output from renal malperfusion
- Hypotension or shock
- Cardiac tamponade
Aortic emergencies may mimic myocardial infarction and other acute cardiovascular disorders.
Stanford Classification
Type Definition General treatment principle
Stanford Any involvement of the ascending Urgent surgical evaluation and operative A aorta repair
Stanford No ascending-aortic involvement; Medical therapy initially when B begins distal to the left subclavian uncomplicated; intervention for artery complications
DeBakey Classification
Type Description
Type I Begins in the ascending aorta and extends beyond the arch
Type II Begins in and remains limited to the ascending aorta
Type III Begins in the descending aorta and may extend distally
Key Investigations
- CT angiography of the aorta
- Transesophageal echocardiography when appropriate
- MRI or MR angiography in selected stable patients
- Transthoracic echocardiography
- Twelve-lead ECG
- Continuous cardiac monitoring
- CBC
- Electrolytes
- Creatinine and renal function
- Liver tests when indicated
- Cardiac troponin
- Coagulation testing
- Blood type and crossmatch
- Lactate when malperfusion or shock is suspected
- Urinalysis
- Chest radiograph
CT and MRI reports should describe aortic dimensions, wall abnormalities, acute aortic findings, branch-vessel involvement, luminal compromise, previous repair, and disease classification.
Preferred Confirmatory Assessment
For many hemodynamically stable patients:
CT angiography of the complete aorta is the preferred rapid diagnostic study.
Alternative imaging may include
- Transesophageal echocardiography
- MRI or MR angiography
The appropriate test depends on
- Hemodynamic stability
- Imaging availability
- Local expertise
- Renal function
- Contrast considerations
- Time sensitivity
- Patient anatomy
Acute Treatment Principles
- Activate emergency management immediately.
- Assess airway, breathing, circulation, neurologic status, and limb perfusion.
- Obtain urgent definitive aortic imaging.
- Provide adequate pain control.
- Begin anti-impulse therapy.
- Use an intravenous beta blocker when appropriate.
- Target systolic blood pressure below approximately 120 mmHg or the lowest pressure preserving organ perfusion.
- Target a heart rate of approximately 60–80 beats/min.
- Add vasodilator therapy after beta blockade when blood pressure remains elevated.
- Obtain urgent cardiovascular and aortic surgical consultation.
- Perform emergency surgical repair for Stanford type A dissection.
- Use intensive medical management initially for uncomplicated Stanford type B dissection.
- Evaluate continuously for rupture, tamponade, aortic regurgitation, malperfusion, stroke, and shock.
These acute treatment principles are consistent with current ACC/AHA aortic-disease guidance.
Potential Complications
- Aortic rupture
- Hemorrhagic shock
- Cardiac tamponade
- Acute aortic regurgitation
- Acute heart failure
- Cardiogenic shock
- Coronary-artery obstruction
- Myocardial infarction
- Stroke
- Altered consciousness
- Upper-extremity ischemia
- Lower-extremity ischemia
- Mesenteric ischemia
- Bowel infarction
- Acute kidney injury
- Renal infarction
- Spinal-cord ischemia
- Paraplegia
- Pleural hemorrhage
- Multiorgan failure
- Death
Long-Term Follow-Up
Long-term management may include
- Strict blood-pressure control
- Long-term beta-blocker therapy when indicated
- Additional antihypertensive treatment
- Smoking cessation
- Lipid and cardiovascular-risk management
- Individualized physical-activity guidance
- Avoidance of unsafe heavy straining
- Surveillance CT or MRI
- Monitoring for aneurysmal enlargement
- Assessment of residual dissection
- Genetic counselling when indicated
- Imaging of first-degree relatives when recommended
First-degree relatives of patients with aortic-root or ascending-aortic aneurysm or aortic dissection may require screening aortic imaging.
CONO Clinical Sciences Examination Traps
Trap 1
Do not assume that all severe chest pain is acute coronary syndrome.
Consider aortic dissection when pain is abrupt, immediately maximal, severe, and associated with back radiation, pulse abnormalities, neurologic findings, or a new aortic-regurgitation murmur.
Trap 2
Do not wait for every classic sign.
Many patients do not have a detectable pulse deficit, unequal arm blood pressure, widened mediastinum, or classic “tearing” pain.
Trap 3
Do not rule out aortic dissection because the ECG is abnormal or troponin is elevated.
Aortic dissection may involve the coronary arteries or produce secondary myocardial injury.
Trap 4
Do not perform an exercise stress test in suspected acute aortic dissection.
Trap 5
Do not administer thrombolytic therapy before considering aortic dissection when high-risk findings are present.
Trap 6
Do not rely on chest radiography to rule out dissection.
A normal chest radiograph does not exclude acute aortic disease.
Trap 7
Do not administer a vasodilator before controlling excessive heart rate and contractility when anti-impulse therapy is required.
Trap 8
Do not delay surgical consultation for acute Stanford type A dissection.
Trap 9
Do not assume every Stanford type B dissection requires immediate open surgery.
Uncomplicated type B dissection is generally treated initially with intensive medical therapy.
Trap 10
Do not discontinue surveillance because the patient feels well.
Residual or repaired aortic disease requires long-term imaging and cardiovascular follow-up.
Educational exam-preparation content. Emergency findings in these cases require urgent medical assessment and should not be managed solely with complementary care.
