Patent Foramen Ovale and Cryptogenic Stroke: Do We Finally Have Closure? Christopher Streib, MD, MS
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1 Patent Foramen Ovale and Cryptogenic Stroke: Do We Finally Have Closure? Christopher Streib, MD, MS
2 Outline 1. Background 2. Anatomy of patent foramen ovale (PFO) 3. Relationship between PFO and cryptogenic stroke 4. PFO closure as secondary stroke prevention 5. Patient selection 6. Summary
3 Incidence of PFO in cryptogenic stroke patients < 55 years old: 40 60% vs. general population: 20-25% Off-label PFO closure gained significant traction Lechat et al. NEJM 1988; Webster et al. Lancet Bridges et al. Circulation 1992;86:
4 PFO Closure: Is PFO closure more effective than medical management at preventing recurrent stroke? Stroke Neurologists Interventional Cardiologists Slide courtesy of Dr. Timrinder Biring
5 PFO Closure
6 Case Presentation PFO Closure
7 Case Presentation PFO Closure Video courtesy of Dr. Timrinder Biring
8 Case Presentation PFO Closure Video courtesy of Dr. Timrinder Biring
9 Case Presentation PFO Closure Video courtesy of Dr. Timrinder Biring
10 Case Presentation PFO Closure Video courtesy of Dr. Timrinder Biring
11 NEJM: 2012 & 2013
12 American Heart Association Secondary Stroke Prevention Guidelines for PFO 1. Insufficient data to establish whether anticoagulation is equivalent or superior to aspirin (Class IIb; Level of Evidence B). 2. For patients with a cryptogenic stroke or TIA and PFO without evidence of DVT, available data do not support a benefit for PFO closure (Class III; Level of Evidence A). AHA Guideline Secondary Stroke Prevention
13 NEJM: September 14, 2017
14 Cryptogenic Stroke: Case 1 39 yo female with no known medical history Small brainstem stroke resulting in subtle right-sided weakness Large PFO with atrial septal aneurysm Is PFO closure indicated?
15 Cryptogenic Stroke: Case 2 61 yo male with left frontal cortical infarct Only risk factors are HTN and DM Moderate-sized PFO with atrial septal aneurysm Remainder of comprehensive stroke evaluation unrevealing Is PFO closure indicated?
16 Cryptogenic Stroke: Case 3 48 yo male physician with a duplicated right middle cerebral artery who presented with right frontal cortical stroke four years prior Stroke work-up negative TTE did not show a PFO, but on TEE a very small PFO was seen on bubble study Is PFO closure indicated?
17 Cryptogenic Stroke: Case 4 45 year old male with no medical history Presents with a cortical stroke in the left hemisphere resulting in trouble speaking Large PFO with atrial septal aneurysm Remainder of comprehensive stroke evaluation unrevealing Is PFO closure indicated?
18 Fetal Circulation Neonatal Circulation Sadler. Fetal and Neonatal Circulation. 2009
19 PFO Prevalence (%) General Population Cryptogenic Stroke Image courtesy:
20 Echocardiogram PFO Atrial Septal Aneurysm
21 TEE with bubble study - Valsalva + Valsalva TEE images courtesy of Dr. Timrinder Biring
22 Pulmonary Circulation
23 Pulmonary Circulation The pulmonary circulation effectively filters small venous emboli advanced imaging shows subsegmental PEs are not uncommon PFOs allows emboli to bypass filtration in the lungs and enter the arterial circulation 2-3mm subsegmental PE = asymptomatic 2-3mm paradoxial embolus to brain = major stroke
24 Middle Cerebral Artery MRI MRA
25 Paradoxical Embolism Upper extremity dopplers Lower extremity dopplers MR venogram pelvis
26 Paradoxical Embolism Case reports published of paradoxical embolism caught in transit In clinical practice, conclusive evidence implicating the PFO is rare Asress et al. PFO: the Current State. BMJ 2015
27 PFO in Cryptogenic Stroke 1. How can we determine how likely the PFO is to be related to the stroke? 2. Which patient with PFO might benefit from closure (i.e. are at highest risk of recurrent stroke without PFO closure)?
28 Is the PFO the Culprit? Risk of Paradoxical Embolism (RoPE) Score Model created from variables that were associated with PFO in the setting of cryptogenic stroke
29 Embolic Stroke of Undetermined Source (ESUS) Lacunar stroke Cortical stroke: consistent with ESUS note abrupt cut-off of otherwise normal vessel
30 Definition of ESUS 1. Non-lacunar strokes (distribution, size <1.5cm) 2. No cardiac arrhythmia or cardioembolic source 3. No symptomatic atherosclerosis: aortic arch, carotid arteries, intracranial No other large vessel pathology, i.e. dissection 4. Completed hypercoagulable evaluation 5. Absence of uncontrolled stroke risk factors 6. No TIAs* Hart. ESUS. Lancet Neuro 2014.
31 Lacunar Stroke Occlusion of small, penetrating end arteries that branch off large caliber vessels Vessel occlusion due to lipohyalinosis or in situ thrombosis secondary to microatheroma Hypertension, DM, HL, smoking lead to vessel narrowing
32 Lacunar Stroke Small strokes (<15-20mm) They do not produce cortical signs Lacune = lake, small CSF space on MRI or autopsy
33 ESUS vs. Lacunar Stroke ESUS LACUNAR Saver. RESPECT: Long-Term Outcomes. NEJM 2017
34 High Risk PFO In theory, a larger shunt or presence of an atrial septal aneurysm increases risk of PFO-related stroke Saver. RESPECT: Long-Term Outcomes. NEJM 2017
35 What Lessons Were Learned? Study Follow-up (years) N TIA ESUS PFO Size Atrial Septal Aneurysm CLOSURE Yes No* No No PC No No** No No RESPECT 2013 * 980 No Yes # No No RESPECT No Yes # No No + CLOSE No Yes modlarge No REDUCE No Yes modlarge Yes, or modlarge shunt *Included lacunar stroke **stroke evaluation not comprehensive # 13% had a single, deep lesion
36 Outcomes: REDUCE, RESPECT, CLOSE Study Number Needed to Treat to Prevent One Stroke Number Needed to Harm: Procedural Complication Number needed to Harm: Afib RESPECT per 5 years CLOSE per 5 years * REDUCE per 2 years *compared to antiplatelet group only, not anticoagulation
37 Outcomes: REDUCE, RESPECT, CLOSE Study Duration (yrs) Stroke PFO Closure Stroke Medical Arm Serious Procedual Complication Afib* CLOSURE % 3.1% 3.2% 5.7% PC % 2.4% 1.5% 2.9% RESPECT (2013) RESPECT (2017) R E D U C E (2017) * events per 100yrs 0.58 events per 100yrs 1.45 events per 100yrs 1.07 events per 100yrs 4.2% ~6.6% 4.2% 6.6% % 5.4% 1.4% * CLOSE % 5.9% 5.9% 4.6%
38 Cryptogenic Stroke: Case 1 35 year old female with migraine aura No other medical problems Small brainstem stroke resulting in subtle right-sided weakness Large PFO with atrial septal aneurysm q High Risk PFO q RoPE Score q ESUS
39 Cryptogenic Stroke: Case 2 61 yo male with left frontal cortical infarct Only risk factors are HTN and DM Moderate-sized PFO with atrial septal aneurysm Remainder of comprehensive stroke evaluation unrevealing q ESUS q High Risk PFO q RoPE Score
40 Cryptogenic Stroke Case 2: RoPE Score 61 yo male with left frontal cortical infarct HTN and Diabetes RoPE Score = 4
41 Cryptogenic Stroke: Case 3 48 yo male physician with duplicated right middle cerebral artery who had a small right frontal cortical stroke four years prior Stroke work-up negative TTE did not show a PFO, but on TEE a very small PFO was seen on bubble study q ESUS q High Risk PFO q RoPE Score
42 Case 3: RoPE Score No stroke risk factors. RoPE Score = 8
43 Cryptogenic Stroke: Case 3 No stroke risk factors. RoPE Score = 8 Referred to Cardiology for evaluation of PFO PFO difficult to visualize With a duplicated MCA and very low risk PFO, we elected not to pursue closure Continued aspirin and considering anticoagulation with Apixiban. 6 years without recurrent stroke.
44 Cryptogenic Stroke: Case 4 45 year old male with no medical problems Presents with a cortical stroke in the left hemisphere resulting in trouble speaking Large PFO with atrial septal aneurysm Remainder of comprehensive stroke evaluation unrevealing q ESUS q High Risk PFO q RoPE Score = 8
45 Summary 1. PFO attributable stroke has a low risk of recurrence, even with medical therapy alone ( % per year) - When medical management is chosen, it is unclear if anticoagulation provides longterm benefit over antiplatelet
46 Summary 2. For most patients with stroke and PFO, the PFO is an incidental finding RoPE Score, radiographic findings, and clinical intuition used to assess the likelihood that the PFO is the culprit lesion
47 Summary 3. Determination of cryptogenic stroke requires comprehensive evaluation May include hypercoagulable testing and prolonged cardiac rhythm monitoring Specific diagnosis of ESUS is radiographic and depends upon stroke infarct pattern
48 Summary 4. Patients with ESUS, high risk PFO, and high RoPE score clearly benefit from PFO closure for secondary stroke prevention To realize the benefit of PFO closure, appropriate patient selection is essential and dependent upon cooperative practice between Primary Care, Cardiology, and Vascular Neurology
49 Thank you Chris Streib:
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