, David Stultz, MD. Aortic Dissection. David Stultz, MD October 7, 2003
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1 Aortic Dissection David Stultz, MD October 7, 2003
2 Background Incidence of 1 in 2000 in US Early mortality of 1%/hour for proximal dissection Two theories of formation Breach of intimal layer of aorta allows blood to encroach on a diseased medial layer, creating a false lumen and intimal flap. Rupture of vasa vasorum in medial layer causes local hematoma causing dissection; no flap is formed. 13% of autopsy cases cannot identify flap. Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1431.
3 Classification Anatomic Debakey Types 1, 2, 3 Stanford Types A, B Descriptive Proximal, Distal Temporal Acute, <2 weeks (2/3) Chronic, >2weeks (1/3) Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1432.
4 Etiology Medial degeneration Chief cause of atraumatic dissections Marfan syndrome 5-9% of all aortic dissections Dissections occur at a young age Thoracic aortic aneurysms Proximal aortic dissections Ehlor s-danlos syndrome Familial aortic aneurysm Mutation of fibrillin-1 gene with loss of elastic fibers Nonclassic degeneration associate with age, hypertension Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: Nienaber CA, Eagle KA. Aortic dissection: new frontiers in diagnosis and management: Part I: from etiology to diagnostic strategies. Circulation Aug 5;108(5):
5 Cystic Medial Necrosis Left from a patient with Marfan syndrome, shows disruption of elastic lamellae in aortic medial layer, with areas completely devoid of elastin (*). Right is normal medial layer. Cotran RS et. al.. Robbins Pathologic Basis of Disease, 5 th ed: 503.
6 Etiology Peak incidence age 60 s to 70 s M:F 2: % with preexisting hypertension Bicuspid aortic valve found in 7-14% of all aortic dissections Associated with Noonan, Turner syndromes Vasculitis, especially giant cell Reports describe association with cocaine in young men Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1433.
7 Pregnancy and Aortic Dissection Of aortic dissections in women <40, half are during pregnancy Generally in the third trimester Some in postpartum Marfan syndrome poses special risk Uncertain causality; not fully explained by increases in BP, CO, blood volume Possible reporting bias Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: Nienaber CA, Eagle KA. Aortic dissection: new frontiers in diagnosis and management: Part I: from etiology to diagnostic strategies. Circulation Aug 5;108(5):629.
8 Trauma Blunt trauma usually causes tear, hematoma or transection; not usually dissection Cardiac catheterization, Balloon pump can cause intimal tear Cardiac surgery carries small risk Up to 18% of patients with dissection have history of cardiac surgery Aortic valve replacement carries highest risk Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1433.
9 Symptoms Common Manifestations Severe tearing pain, usually sudden onset Migratory pain described in 17% of cases Location Ascending aorta Anterior pain involves ascending aorta in 90% of cases Neck, throat, jaw, face Descending aorta Interscapular pain involves descending aorta in 90% of cases Back, abdomen, lower extremity pain Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1433.
10 Symptoms Uncommon Manifestations Syncope (9%) Congestive heart failure (7%) Due to acute aortic regurgitation CVA (5%) Peripheral neuropathy Paraplegia Sudden death Tamponade (hemopericardium due to rupture) Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1433.
11 Blood Pressure Hypertension In distal dissection, 70% In proximal dissection, 36% Hypotension Distal, 4% Proximal, 25% Usually caused by tamponade, aortic regurgitation, pleural or peritoneal rupture Dissection may occlude brachiocephalic artery Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1434.
12 Physical Findings Pulse deficit Aortic regurgitation 32% of proximal dissections Actual regurgitation occurs in 50-66% of proximal dissections Neurologic Abnormalities in 6-19% of all dissections Pleural Effusion Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
13 Mechanism of Aortic Regurgitation A Normal anatomy, leaflets suspended from sinotubular junction B Dilated ascending aorta widens sinotubular junction C Leaflet detaches from commisural attachment, leaflet prolapse occurs D Extensive dissection, flap prolapses across valve Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1434.
14 Dissection Extension Proximal dissection involves coronary artery in 1-2% of cases Most commonly flap involves right coronary ostium, causing inferior infarct Chest xray may not be sufficient to rule out dissection Distal dissection can extend 5-8% of cases involve renal artery 3-5% involve mesenteric ischemia/infarction Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
15 Proximal Complications Otto CM. Textbook of Clinical Echocardiography, 2 nd ed: 383.
16 Labs Chest Xray 81-90% show widening of aortic silhouette Calcified intima separated 1.0cm from outer soft tissue border suggests dissection Plural effusion common, often left side 12% have normal chest xray EKG - nonspecific 1/3 LVH, 1/3 normal Evaluate for myocardial infarction Monoclonal antibodies to smooth muscle myosin heavy chains Tested in 27 patients within 12 hours of acute dissection 90% sensitive, 97% specific Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
17 Chest Xray A Baseline study 3 years prior B Aortic knob widened (arrow), proximal aortic dissection Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1435.
18 Diagnostic Techniques Aortography Contrast enhanced CT MRI Transthoracic echocardiogram Transesophageal echocardiogram Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1437.
19 Aortography Previous gold standard However, only 77-88% sensitive Direct signs Two lumens (87%) Intimal flap (70%) Indirect signs Deformed aortic lumen Thickened walls Branch vessel abnormalities Aortic regurgitation Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1437.
20 Aortography Advantages Extent of involvement Detects aortic regurgitation Screens for coronary involvement Disadvantages Suboptimal sensitivity Invasive, requires lab and team Contrast exposure Cannot visualize intramural hematoma Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1438.
21 F False Lumen I Intimal Flap T True Lumen Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1436.
22 F False Lumen I Intimal Flap (also arrows) T True Lumen CA Carotid Artery Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1437.
23 CT Must visualize two lumens in aorta Separated by flap Differential contrast opacification 83-94% sensitive, % specific Spiral CT technique enhances sensitivity and specificity Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1438.
24 CT Advantages Nonivasive Readily available Can visualize intramural hematoma Disadvantages IV contrast Rarely identifies site of intimal tear Cannot detect aortic regurgitation Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1438.
25 CT of descending aortic dissection Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1438.
26 MRI Current gold standard High resolution images in multiple planes 98% sensitivity and specificity 88% sensitive for identifying site of intimal tear Cine-MRI 85% sensitive for aortic regurgitation Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
27 MRI Advantages High sensitivity and specificity Completely noninvasive Disadvantages Contraindicated with pacemakers, metal Limited monitoring Not suitable for unstable patient Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
28 MRI of descending thoracic aortic dissection Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1439.
29 Echocardiography Views intimal flap with separation of true and false lumens Should be seen in several views Doppler should demonstrate differential flow in lumens Transthoracic 59-85% sensitive 63-96% specific IVUS More useful in abdominal aorta Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
30 Transthoracic echocardiogrpahy See mobile linear structure in a dilated aorta Artifact will decrease specificity Low sensitivity, due to poor resolution of ascending and descending aorta Can observe aortic regurgitation Wall motion may be compromised when coronary artery is involved When clinical suspicion is low, TTE may be sufficient to almost rule out dissection When clinical suspicion is moderate or high, TTE is inappropriate as a screening test Otto CM. Textbook of Clinical Echocardiography, 2 nd ed:
31 Transesophageal echocardiography 98-99% sensitivity 94-95% specificity with biplane 73% sensitive for detecting intimal flap 100% sensitive for aortic regurgitation and pericardial effusion Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1440.
32 Transesophageal echocardiography Visualize linear, bright echogenic flap in aortic lumen with erratic motion Doppler can visualize blood flow in both true and false lumens Proximal aortic root visualized in short-axis at aortic valve level Ascending aorta visualized in long axis Otto CM. Textbook of Clinical Echocardiography, 2 nd ed:
33 Transesophageal long axis Transesophageal short axis Otto CM. Textbook of Clinical Echocardiography, 2 nd ed: 384.
34 Transesophageal long axis Transesophageal long axis Color flow doppler Otto CM. Textbook of Clinical Echocardiography, 2 nd ed: 384.
35 Dissection flap in ascending aorta but not involving valve leaflets Nanda, NC, Domanski MJ. Atlas of Transesophageal Echocardiography: 135.
36 Dissection flap in ascending aorta involving valve leaflets Nanda, NC, Domanski MJ. Atlas of Transesophageal Echocardiography: 135.
37 Prolapse of a dissection flap Nanda, NC, Domanski MJ. Atlas of Transesophageal Echocardiography: 135.
38 Dissection flap near Left Main ostium, but not involving it Nanda, NC, Domanski MJ. Atlas of Transesophageal Echocardiography: 136.
39 Dissection flap involving Right Main coronary artery Nanda, NC, Domanski MJ. Atlas of Transesophageal Echocardiography: 136.
40 Communication between true and false lumen Thrombus is false lumen Nanda, NC, Domanski MJ. Atlas of Transesophageal Echocardiography: 136.
41 Color flow revealing two communications Nanda, NC, Domanski MJ. Atlas of Transesophageal Echocardiography: 137.
42 Short axis view of proximal dissection
43 Long axis view of proximal dissection
44 Long axis view of proximal dissection panning to show intimal tear
45 Long axis view of proximal dissection, detail of intimal tear
46 Short axis view of proximal dissection, doppler over flap
47 Coronary angiography Acute involvement secondary to dissection TEE able to verify patency in most cases Proximal obstruction often can be identified intraoperatively Catheterization may be unsuccessful and delay therapy Chronic atherosclerosis CAD occurs in 25% of patients with dissection Not typically identified intraoperatively Small studies do not demonstrate much difference among Patients with CAD vs those without Patients with pre-op catheterization vs those without Possible indication for catheterization Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 Known CAD th ed: Ischemic EKG changes
48 Medical Management General Principles Acute care setting Two large bore IV catheters Arterial line, preferably in right arm Consider pulmonary artery cathether CVP, CO, PCWP Try to spare femoral sites in preparation for bypass Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1442.
49 Blood Pressure Goal is to lower dp/dt (force of LV ejection) IV Beta blockers Propranolol, labetolol, esmolol Nitroprusside potent vasodilator When used alone, increases dp/dt! Contraindication to Beta blocker Verapamil, diltiazem, nifedipine Consider ACE inhibitor if renal arteries compromised Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
50 Hypotension Consider pseudohypotension Involvement of brachiocephalic artery Consider tamponade, aortic rupture Rapid volume expansion Norepinephrine or phenlephrine if pressors are needed Only low doses of dopamine, as this increases dp/dt Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1443.
51 Tamponade Very small (7 patient) series have shown deleterious effect of pericardiocentesis Main goal is to proceed expeditiously to surgical repair Avoid pericardiocentesis unless PEA occurs Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1443.
52 Definitive care Proximal dissection Urgent surgical repair indicated Medical treatment has 30 day survival up to 42% Distal dissection Medical therapy equivalent to surgical repair when uncomplicated 30 day survival of 92% with medical treatment Chronic dissection medical therapy is preferred Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed: 1443.
53 Nienaber CA, Eagle KA. Aortic dissection: new frontiers in diagnosis and management: Part I: from etiology to diagnostic strategies. Circulation Aug 5;108(5):631.
54 Long term followup If discharged from hospital, 75-82% five year survival for all dissections Goal SBP <130 mmhg Prefer long term Beta blocker Avoid vasodilators alone 17-25% incidence of remote site aneurysm Most appear within 2 year Re-evaluate with MRI, CT, or TEE 3,6,12,18,24 months then q6-12 months Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
55 Atypical aortic dissections Intramural hematoma Rupture of vasa vasorum in medial layer No intimal tear Best identified with CT with & without contrast May use MRI or TEE although not as sensitive Same management as typical dissection Penetrating atherosclerotic ulcer Ulceration of pre-existing atherosclerotic lesion Best seen with aortography Typically localized without spread Further surgical indications: Penetration through medial layer to cause pseudoaneurysm Penetration through adventitia to cause rupture Braunwald E et. al.. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed:
56 References Braunwald E, Zipes DP, Libby P. Heart Disease: A Textbook of Cardiovascular Medicine, 6 th ed. Philadelphia: WB Saunders Company, Cotran RS, Kumar V, Robbins SL. Robbins Pathologic Basis of Disease, 5 th ed. Philadelphia: WB Saunders Company, Otto CM. Textbook of Clinical Echocardiography, 2 nd ed. Philadelphia: WB Saunders Company, Nanda, NC, Domanski MJ. Atlas of Transesophageal Echocardiography. Philadelphia: Lippincott Williams & Wilkins, Nienaber CA, Eagle KA. Aortic dissection: new frontiers in diagnosis and management: Part I: from etiology to diagnostic strategies. Circulation Aug 5;108(5): Nienaber CA, Eagle KA. Aortic dissection: new frontiers in diagnosis and management: Part II: therapeutic management and follow-up. Circulation Aug 12;108(6):772-8.
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