non-invasive conference: aortic dissection ali r. rahimi, md mph september 24, 2008
TRANSCRIPT
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Non-Invasive Conference:Aortic Dissection
Ali R. Rahimi, MD MPH
September 24, 2008
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Anatomy
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Aortic Dissection
“a splitting of the layers of the aortic wall (within the media), permitting longitudinal propagation of a blood-filled space within the aortic wall”
Most common cause of death related to the human aorta
Incidence 2.6 to 3.5 per 100,000 person-years
65% men with mean age of 63 years
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Pathophysiology
Degeneration of aortic media, or cystic medial necrosis, is prerequisite for nontraumatic dissection
Primary rupture of intima with secondary dissection of the media vs. hemorrhage within the media and subsequent rupture of overlying intima
Propagation can occur both distal and proximal
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Risk Factors
Systemic hypertension (72%)
Atherosclerosis (31%)
Pre-existing aortic aneurysm (13% known) more common < 40 yo (19%)
Vasculitis (giant cell arteritis, Takayasu arteritis, rheumatoid arthritis, syphilitic aortitis)
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Risk Factors
Disorders of collagen (eg, *Marfan syndrome, Ehlers-Danlos syndrome, annuloaortic ectasia) *Present in 50% of those < 40 yo vs. 2% of older patients
Bicuspid aortic valve Present in 9% < 40 yo vs. 1% over age 40 Enlargement of aortic root and/or ascending aorta
Aortic coarctation, Turner Syndrome, CABG (0.04%), Prior AVR, Cardiac Cath (2%), Trauma (deceleration injury), Weight lifting, Crack cocaine
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Ascending aortic dissections ~ 2x as common Right lateral wall of ascending aorta most common site Aortic arch involvement ~ 30%
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Variants
Class I - classic separation of intima/media and dual lumens; flap between true and false aneurysm and clot in false lumen;
Class II - intramural hematoma with separation of intima/media but no tear or flap; Class III - limited intimal tear without hematoma and eccentric bulge at tear site; Class IV - atherosclerotic ulcer penetrating to adventitia with surrounding hematoma; Class V- iatrogenic or traumatic dissection
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Clinical Presentation
Severe, sharp or "tearing" posterior chest or back pain (distal to L subclavian) or anterior CP (ascending dissection)
Isolation or with syncope, CVA, MI, CHF, …
HTN more common in type B dissection (70% vs. 36%)
Pulse deficit in 19-30% with an acute type A dissection vs. 9-21% with a type B dissection
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Clinical Finding Artery or Structure
Aortic insufficiency or CHF Aortic valve
AMI Coronary artery (right)
Tamponade Pericardium
Hemothorax Thorax
CVA or Syncope Brachiocephalic, CC, Left subclavian
UE pulselesness, low BP, pain Subclavian
Paraplegia Intercostal
LE pain, pulselessness, weakness Common iliac
Abdominal pain, mesenteric ischemia Celiac or mesenteric
Back or flank pain; ARF Renal artery
Horner syndrome Superior cervical sympathetic ganglion
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Differential Diagnosis
Acute Coronary Syndrome Pericarditis Pulmonary embolus Aortic regurgitation without dissection Aortic aneurysm without dissection Musculoskeletal pain Mediastinal tumors Pleuritis Cholecystitis Atherosclerotic or cholesterol embolism Peptic ulcer disease or perforating ulcer Acute pancreatitis
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Diagnosis
Clinical Prediction of Aortic Dissection
Study of 250 pts with acute chest and/or back pain (128 with AD) found 96% with acute AD identified using 3 clinical features:
Abrupt onset of thoracic or abdominal pain with a sharp, tearing and/or ripping character
Mediastinal and/or aortic widening on chest radiograph Variation in pulse (absence of a proximal extremity or carotid pulse)
and/or blood pressure (>20 mmHg difference in the right and left arm)
Any 2 out of 3 variables (77% of dissections): ≥83%
Additional imaging studies obtained in 98% of pts due to limited sensitivity of CXR, especially in type B dissections
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Chest X-Ray
Type A 63% with mediastinal widening, 11% with no abnormality
Type B 56% with mediastinal widening, 16% with no abnormality
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Electrocardiogram
31% normal
42% non-specific ST and T wave changes
15% ischemic changes
5% changes c/w AMI
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Advanced Imaging Modalities
Aortic Dissection
Involvement of the ascending aorta The extent of dissection and the sites of entry and
reentry Thrombus in the false lumen Branch vessel or coronary artery involvement Aortic insufficiency Pericardial effusion
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Advanced Imaging Modalities
Based on year 2000 IRAD:
mean 1.83 studies per patient 61% CT 33% Echocardiography 4% Aortography 2% MRI
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ESC Guidelines for Diagnostic Imaging of Acute Aortic Dissection
Class I - TTE followed by TEE
Class II – CT, CTA to define anatomy
Class IIa – CTA in stable pts, MRI in stable pts, Intravascular US
Class IIb - CT if detection of tears is crucial, CTA in unstable pts, intravascular US to guide intervention
Class III – MRI in hemodynamically unstable patients, routine pre-op CTA
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ESC Guidelines for Diagnostic Imaging of Chronic Aortic Dissection
Class I – MRI
Class IIa – TTE, TEE, CTA
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CT Scan
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CT Scan
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CT Scan
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CT Scan Sensitivity 83-98% Specificity 87-100% Advantages:
availability at most hospitals ID of intraluminal thrombus and pericardial effusion
Disadvantages: Intimal flap seen < 75% of cases and site of entry is rarely
identified Potentially nephrotoxic iodinated contrast Unable to assess for aortic insufficiency
Accuracy of CT is improved with spiral CT and electron beam or multidetector CT
Spiral CT may be more accurate than MRI or TEE in the detection of aortic arch vessel involvement Limitation: Without ECG gating simulate artifact ~ aortic
dissection
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TTE
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TTE
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TTE
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TTE
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TTE
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TTE
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TTE
Limited utility for evaluation of the thoracic aorta for dissection unable to adequately visualize distal ascending, transverse, and
descending aorta in a substantial majority of patients
Intimal flap in the proximal aorta may be seen, though the sensitivity and specificity of TTE are inferior compared to CT, MRI, and TEE
Most useful for assessment of cardiac complications of dissection, including AI, pericardial effusion/tamponade, and regional LV dysfunction
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TEE
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TEE
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TEE
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TEE
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TEE
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TEE
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TEE
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TEE Advantages
sensitivity 97 – 99% close proximity of esophagus to thoracic aorta and absence of an
intervening lung or chest wall portable procedure diagnosis within minutes useful in patients too unstable for CT or MRI intimal dissection flaps can be identified with high spatial resolution true and false lumens can be identified thrombosis in the false lumen, pericardial effusion, aortic
regurgitation, and the proximal coronary arteries can be visualized 135º long axis view can define severity and mechanism of aortic
regurgitation that complicates acute type A dissections
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TEE
Disadvantages
Specificity as low as 77-85% false-positive findings in the ascending aorta artifacts can be detected by addition of M-mode imaging,
increasing specificity to almost 100%
Requires sedation and esophageal intubation
TEE requires availability of experienced operators (both physicians and technicians) to assure accurate results
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Hagan, Etc, JAMA 2000 283:897
30 Day Mortality Rates for Acute Aortic Dissection
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Mechanical Composite Root Repair with and w/o Hemiarch Repair
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Homograft Repair
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Porcine BioRoot Replacement
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Valve Sparing Replacement
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Aortic Dissection Repair:Teflon Felt as Neomedia
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Endovascular Aortic Stent Grafts
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Endovascular Aortic Stents
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References
Hurst the Heart, 11th Edition Manning, W. UpToDate Online 16.2.
Clinical manifestations and diagnosis of aortic dissection.