Eduardo Hariton, HMSIII. Gillian Lieberman, MD. Nov-Dec Eduardo Hariton, Harvard Medical School Year III. Gillian Lieberman, MD
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1 Nov-Dec 2012 Eduardo Hariton, Harvard Medical School Year III
2 Outline Intro to our Patient Review of Aortic Dissection Menu of Tests Images and Diagnosis Treatment and complications Take home points References Acknowledgements 2
3 Outline Intro to our Patient Review of Aortic Dissection Menu of Tests Images and Diagnosis Treatment and complications Take home points References Acknowledgements 3
4 Our Patient: Presentation Our patient is an 81F who presented to OSH with sudden onset substernal chest pain radiating to her back at rest She presented to OSH within 30 minutes of symptoms onset and had a CT scan, which reported a PE and a type IIIa aortic dissection Transferred to BIDMC on labetalol drip Repeat CTA chest and abdomen was recommended to evaluate the patient s dissection 4
5 Our Patient: Past Medical Hx Temporal arteritis Aortic insufficiency Aortic stenosis Mitral regurgitation Chronic back pain Compression of vertebrae Arthritis Osteoporosis COPD / Asthma GERD Macular degeneration 5
6 Our Patient: Past Surgical Hx Bilateral knee replacements Bilateral carpal tunnel releases Right eye cataract surgery Trigger finger release 6
7 Our Patient: Medications Plavix 75mg Simvastatin 20mg Metoprolol 12.5mg Diovan 40mg Levothyroxine 25 mcg Symbicort 2 puffs inh BID Albuterol inh Q4H prn Excedrin prn headache OTCs: Vitamin D, B12, and omega-3 7
8 Our Patient: Other information SH: Quit smoking 10 years ago (~40 pack years). Occasional EtOH. Denies drug use. Retired church secretary FH: None pertinent Allergies: NKDA 8
9 Our Patient: Physical Exam VS: BP R arm: 98/42 / L arm: 90/40 HR: 64 RR: 18 Pt Alert and Oriented in NAD Neck: Supple, trachea midline Chest: Clear to auscultation bilaterally Heart: RRR. 3/6 late peaking SEM Abd: Soft / NT / ND Extremities: Bilat LE edema to just above knee Pulses: Strong pulses in all extremities 9
10 Differential Diagnosis Acute Pancreatitis Aortic dissection Musculoskeletal pain Myocardial ischemia (ST or NST) Peptic ulcer disease Pericarditis Pleuritis Pulmonary embolus 10
11 Outline Intro to our Patient Review of Aortic Dissection Menu of Tests Images and Diagnosis Treatment and complications Take home points References Acknowledgements 11
12 History of Aortic Dissection First well-documented case in 1760: King George II of England died while straining on the commode First pathologic description in 1761: Italian anatomist Giovanni Battista Morgagni Death sentence until 1955 (bypass invented): DeBakey performed first successful repair At 97, DeBakey was the oldest to survive the surgical procedure he pioneered 12
13 Risk Factors for Aortic Dissection Aortic Coarctation Atherosclerosis Bicuspid Aortic valve Chronic or severe hypertension Collagen Disorders: Marfan s, Ehlers- Danlos syndrome Trauma Inflammatory Disease: Giant Cell arteritis and Takayasu arteritis 13
14 Epidemiology of Aortic Dissection Evidence of aortic dissection is found in 1-3% of all autopsies (1 in 350 cadavers) 2000 cases/yr reported in the US More common in African Americans and less common in Asians than in Caucasians 75% of dissections occur in those 40-70, with a peak in 50-65YO range Patients with Marfan s syndrome present earlier in their 30s-40s 14
15 Pathophysiology of Aortic Dissection Atherosclerosis: Inflammatory plaques have proteolytic factors that weaken the wall of vessels by destroying elastin and collagen Cystic medial degeneration: Accumulation of basophillic ground substance and loss of elastic and muscle fibers in the media Dissection is the result of a longitudinal separation of the aortic intima and adventitia caused by circulating blood gaining access to and splitting the media of the aortic wall, creating a false lumen 15
16 Pathophysiology of Aortic Dissection rg/stw/images/ jpg 16
17 Presentation of Aortic Dissection Tearing chest pain radiating to the back Abdominal pain Clammy skin Dysphagia Hoarseness 17
18 Classification of aortic dissections Stanford (A / B) Type A: Ascending aorta involved (60-70% of cases) Type B: Descending aorta only involved (30-40% of cases) DeBakey (I / II / III) Type I: Ascending and descending aorta involved Type II: Ascending Only Type III: Descending Only Multidetector CT of Aortic Dissection: A Pictorial Review. McMahon, Michelle A. and Squirrell, Christopher A. RadioGraphics 2010; 30:
19 Classification of aortic dissections Image A represents a Stanford A or a DeBakey type 1 dissection. Image B represents a Stanford A or DeBakey type II dissection. Image C represents a Stanford type B or a DeBakey type III dissection. 19
20 Goals of Imaging Diagnose aortic dissection Classify the dissection Identify entry and reentry sites Ascertain vessel involvement Diagnose any complications from a dissection 20
21 Outline Intro to our Patient Review of Aortic Dissection Menu of Tests Images and Diagnosis Treatment and complications Take home points References Acknowledgements 21
22 Menu of Tests X-ray CT MRI TEE Angiography 22
23 ACR Appropriateness Criteria American College of Radiology Appropriateness Criteria 23
24 Chest X-ray Can be initial study of choice if aortic dissection is suspected Subclinical dissections can be picked up incidentally Chest radiographic findings may be normal in 10% 40% of aortic dissections Advantages Fast Available emergently Noninvasive Operator independent Disadvantages Radiation Non specific for mediastinal widening Low sensitivy and specificity (~60%) American College of Radiology Appropriateness Criteria Multidetector CT of Aortic Dissection: A Pictorial Review. McMahon, Michelle A. and Squirrell, Christopher A. RadioGraphics 2010; 30:
25 CT Scan Most common initial study in acute setting CTA can identify double lumen and presence of an intimal flap only 70% of the time Fast Advantages Available emergently Relatively noninvasive Operator independent Sensitivity of 100% and a specificity of 98%, American College of Radiology Appropriateness Criteria Disadvantages Requires IV contrast Difficult to assess site of intimal tear Multidetector CT of Aortic Dissection: A Pictorial Review. McMahon, Michelle A. and Squirrell, Christopher A. RadioGraphics 2010; 30:
26 MRI Highest sensitivity and specificity Great for chronic aortic dissections when the patient is stable and for F/U Advantages Noninvasive High quality images in several places Operator independent No radiation High sensitivity and specificity American College of Radiology Appropriateness Criteria Disadvantages Length of study Patient must be stable Not usually available emergently Contraindicated in many patients (old surgical clips, pacemakers, etc.) Multidetector CT of Aortic Dissection: A Pictorial Review. McMahon, Michelle A. and Squirrell, Christopher A. RadioGraphics 2010; 30:
27 TEE Sensitivity of 94% 100% and a specificity of 77% 100% for identifying an intimal flap Good for assessing for complications: Aortic insufficiency (doppler) or pericardial effusions Advantages Available at bedside Fast Can identify aortic insufficiency as well as entry and reentry sites Disadvantages Invasive Operator dependent Poor images for surgical repair Contraindicated in patients with esophageal disease American College of Radiology Appropriateness Criteria Multidetector CT of Aortic Dissection: A Pictorial Review. McMahon, Michelle A. and Squirrell, Christopher A. RadioGraphics 2010; 30:
28 Angiography Previously gold standard but falling out of favor Only used in patients where definite coronary evaluation is required Advantages High diagnostic accuracy (98% in digital subtraction angiography) Disadvantages Invasive Iodinated contrast required Operator dependent American College of Radiology Appropriateness Criteria 28
29 Outline Intro to our Patient Review of Aortic Dissection Menu of Tests Images and Diagnosis Treatment and complications Take home points References Acknowledgements 29
30 Our Patient: Aortic Arch on Chest CT Aortic Arch Axial C+ Chest CT PACS BIDMC 30
31 Our Patient: Pulmonary Embolus on Chest CT Ascending Aorta Pulmonary Embolus Descending Aorta False Lumen Axial C+ Chest CT PACS BIDMC 31
32 Our Patient: Aortic Dissection on Chest CT Ascending Aorta Pulmonary Embolus Descending Aorta False Lumen Axial C+ Chest CT PACS BIDMC 32
33 Our Patient: Findings Typical presentation of aortic dissection Type B aortic dissection beginning at the level of the take-off of the left subclavian artery and ending at the diaphragmatic hiatus shortly above the level of the celiac trunk. Large pulmonary embolism in the right main pulmonary artery Patient was managed with hypertensive control and her symptoms resolved 33
34 Aortic Dissection on X-Ray and MRI We just saw radiological evidence of aortic dissection on Axial C+ Chest CT Lets continue to view how aortic dissection manifests itself in other imaging modalities 34
35 Companion Patient #1: Aortic Dissection on Chest X-Ray Widened Aortic Knob Widened Mediastinum Frontal PA Chest Radiograph 35
36 Companion Patient #2: Aortic Dissection on MRI Entry Site Re-entry Site False Lumen Descending Aorta High-resolution MRI (TrueFISP retro) in parasagittal orientation 36
37 True Vs. False Lumen in Aortic Dissection False lumen is most often posterior to true lumen Cobwebs in false lumen: These are residual ribbons of media that have been incompletely sheared from the aortic wall during the dissection process Cogwebs Magnified Axial C+ Chest CT Aortic cobwebs: an anatomic marker identifying the false lumen in aortic dissection--imaging and pathologic correlation. Williams et al., Radiology 1994 Jan;190(1): nt/193/4/928/f15.large.jpg 37
38 Outline Intro to our Patient Review of Aortic Dissection Menu of Tests Images and Diagnosis Treatment and complications Take home points References Acknowledgements 38
39 Treatment of Aortic Dissection Type A dissection typically requires urgent surgical intervention Type B dissection can often be treated medically with blood pressure control, unless there are complications due to extension of dissection (ie: end organ ischemia or persistent pain) Multidetector CT of Aortic Dissection: A Pictorial Review. McMahon, Michelle A. and Squirrell, Christopher A. RadioGraphics 2010; 30:
40 Complications of Aortic Dissection Rupture is almost universally fatal due to cardiovascular collapse Dissection can lead to stroke, infarct, paralysis, renal failure, and other manifestations of end organ ischemia 40
41 Our Patient: Outcome and Follow-up Our patient was discharged 9 days after admission on anticoagulation and strict BP control She did well for two months and then presented with a large PE, syncope, and complete heart block She had a pacemaker implanted and was discharged soon after Has done well since. Will have F/U MRI 41
42 Outline Intro to our Patient Review of Aortic Dissection Menu of Tests Images and Diagnosis Treatment and complications Take home points References Acknowledgements 42
43 Take Home Points Aortic dissection is life threatening and must be diagnosed and managed promptly CT W&WO contrast is good initial study of choice in the acute setting MRI is excellent in non acute setting CXR is often not diagnostic TEE is good for assessing complications 43
44 References American College of Radiology Appropriateness Criteria Aortic cobwebs: an anatomic marker identifying the false lumen in aortic dissection--imaging and pathologic correlation. Williams et al., Radiology Jan;190(1): Multidetector CT of Aortic Dissection: A Pictorial Review. McMahon, Michelle A. and Squirrell, Christopher A. RadioGraphics 2010; 30: heartj.oxfordjournals.org/content/27/5/613/f5.expansion
45 Acknowledgments Dr. Gillian Lieberman Dr. Mark Masciocchi Claire Odom Daniel Kim Matthew Torre Hayley Walker 45
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