Spinal cord protection segmental artery embolization. Christian D. Etz, MD, PhD Heisenberg Professor for Aortic Surgery
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1 Spinal cord protection segmental artery embolization Christian D. Etz, MD, PhD Heisenberg Professor for Aortic Surgery
2 Ischemic Spinal Cord Injury No definite prevention strategy essential for safe open and endovascular repair 1,2 1 Coselli, LeMaire. Descending and Thoracoabdominal Aortic Aneurysms. In: Lh C, ed. Cardiac Surgery in the Adult. New York: McGraw-Hill; 2008: Etz CD et al. Spinal cord perfusion after extensive segmental artery sacrifice: can paraplegia be prevented? Eur J Cardiothorac Surg 2007;31(4):643-8.
3 If the theory does not fit the facts too bad for the facts Kurt Biedenkopf (former Ministerpräsident of Saxony) quoting a frustrated UC Berkley student
4
5
6 If the theory does not fit the facts, change the facts Albert Einstein
7 Segmental Artery Occlusion Yorkshire pigs (N = 20)
8 Direct blood pressure measurement
9 MAP SCPP
10 POSTOPERATIVE SCPP 80 Paraparetic Animals Recovered Animals SCPP (mmhg) ~ 95% > 60% 0 1h 5h 24h 48h 3d 4d 5d 1h 5h 24h 2d 3d 4d 5d after ALL clamped
11 Collateral Network recovers blood flow within 72h!
12
13 HUMAN vs PIG
14
15
16
17
18 UNDERSTANDING THE IMPLICATIONS
19 Etz et al., J Thorac Cardiovasc Surg Apr;141(4): Etz et al., J Thorac Cardiovasc Surg Apr;149(4):1074-9
20 Enlargement of lower thoracic and lumbar collaterals significant changes!
21 DEVELOPING A NEW STRATEGY THE STAGED REPAIR
22 Experimental solution: the staged repair
23 conventional repair paraplegia rate: 20-30%
24 staged repair 100% recovery!
25 After total SA Occlusion: regeneration of arterial perfusion in 5 days with staged occlusion zero paraplegia Etz et al. J Thorac Cardiovasc Surg Dec;140(6 Suppl):S125-30
26 Patient Number Hours ONSET TIME OF POSTOPERATIVE PARAPLEGIA Concept: Delayed Paraplegia, timing of delayed paraplegia, and clinical support of the Griepp/Etz Observation Emergence Emergence Emergence 2nd Episode Mean: 36.8 ± 38.9 hrs (1st Episode) Median: 21.6 hrs (1st Episode) 7.3 Days or 176 hrs (2nd episode) COURTESY OF JOE BAVARIA 2nd Episode Days (0) (2.1) (4.2) (6.3) (8.3) (10.4) Department of Surgery, University of Pennsylvania Health System
27 Retrospective clinical data: significant lower incidence of SCI with staged repair (= staged occlusion of SAs) Etz et al. J Thorac Cardiovasc Surg Jun;139(6):
28
29 EXPERIMENTAL PRIMING OF THE COLLATERAL NETWORK
30 Hypothesis: Preemptive Conditionig with Minimally Invasive Segmental Artery Coilembolisation (MISACE) may help to prevent SCI
31 no histologic damage in coiled areas
32 zero paraplegia after coil embolization
33
34 FIRST-IN-MAN EXPERIENCE
35 Etz et al. J Thorac Cardiovasc Surg Apr;149(4):1074-9
36 MISACE Minimally invasive coil deployment - schematically Coil-occluded (right) / patent SA (left)
37
38 MISACE pt #1 Conventional open repair left common femoral access (6F braided sheath, Flexor, Cook Medical, Bjaeverskov, Denmark) as 2 nd -stage 31-month rd an 4 interval lumbar SA catheterized conventional repair deployment of microcoils (0.018 VortX-Diamond, Boston Scientific) into proximal SA Intra op course uneventful no significant back bleeding short cross clamp time discharged home w/o neurological impairment
39 MISACE pt #2 Endovascular repair right common femoral access (6F braided sheath, 2 nd -stage Flexor, Cook Medical, Bjaeverskov, Denmark) 4th SA catheterized (5F, 65cm C2-catheter, Cook Medical, 8 week interval Bjaeverskov, Denmark and 2.7F Progreat microcatheter, Terumo Europe, Leuven, Belgium) Endo repair with a four-branched stent- Deployment of microcoils in the proximal SA graft (T-branch, CE-marked, Cook Medical, Bjaeverskov, Denmark) in general anesthesia with adjunctive CSF-drainage all remaining open SAs between the T7 and the infrarenal aorta occluded w/o endoleakage discharged home w/o neurologic deficit on POD #8
40
41 There are several important breakthroughs relating to managing and preventing spinal cord injury that have been simultaneously brought together with the MISACE technique. The first is that optimal perioperative management [ ] is not enough to prevent cord ischemia. The second breakthrough represented by the MISACE technique is the capacity to selectively coil-embolize segmental arteries.
42 CREATING EVIDENCE RCT PAPAartis starting in 2017
43 Paraplegia Prevention in Aortic Aneurysm Repair by Thoracoabdominal Staging with Minimally-Invasive Segmental Artery Coil-Embolization (MISACE) : A Randomized Controlled Multicentre Trial (PAPA_ARTiS)
44 PAPA_ARTiS EUROPE Horizon 2020 funded with 6.3M starting in 2017
45 PAPA_ARTiS EUROPE
46 PAPA_ARTiS EUROPE spin labeled 4D MRI
47 DISCUSSION
48
49 INCIDENCE
50 Inzidenz der Paraplegie Endo / Stentgraft endo Year N DTA Type I Type II Type III Type IV Greenberg et al. 3 ** Gravereau x et al. 4 1% 10% 19% 5% 3% 5.7% # # # # Conrad et al % # # # # Bavaria et al. 5 3% # # # # ** The severity of the SCI (paraplegia versus paraparesis) and the potential for recovery did not differ between treatment modalities SCI was more commonly noted immediately after OPEN REPAIR (29% versus 13%) and in a delayed presentation (up to 6 days) after ER
51 Inzidenz der Paraplegie offene Chirurgie Open Surgery year N DT A Type I Type II Type III Type IV Greenberg et al % 14% 22% 10% 2% Conrad et al % 24% 20% 13% 2% Fehrenbacher % 4.3% 5.4% 3.1% 0% Coselli et al # 3.3% 6.3% 2.6% 1.4% Bavaria et al % # # # # Zoli et al % 2.5% 11.5% 3.9% 2.2% Sundt et al % 0% 0% 0% 0% Schepens et al Paraplegia 5.3%, paraparesis 3%
52 open repair endovascular =! Aortic X-clamping vs. Segmental Artery Occlusion
53 MISACE side effects and Cx
54 CONCLUSIONS staged preconditioning to significantly reduce iatrogenic SCI after TAAA-repair now clinically available much safer treatment with only 1-2 sessions in the cath lab reduction of backbleeding through SAs during open repair reducing steal and shortening OR times reduction of type II endoleakage after endo repair
55 X-clamping
56 ischemic Spinal Cord Injury Aortic X- clamping Segmental Artery Occlusion 1 2
57 Aortic X-clamping open TAA/A repair x
58 SPINAL CORD BLOOD FLOW prior to, during and after 28ºC baseline flow desc X-clamp: NO flow below T 8
59 UNKNOWN open questions to be clarified
60 2 Bestimmung des optimalen Okklusionsmusters Hypothese: alternierend schnellere Arteriogenese (besser als regional) Okklusion alternierend vs. regional (N=10) (N=10) 2 Perfusionsdruck Blutfluß Ultrastruktur im Verlauf
61 Etz et al. J Thorac Cardiovasc Surg Feb;135(2): Etz et al., J Thorac Cardiovasc Surg Apr;141(4): Etz et al., J Thorac Cardiovasc Surg Apr;149(4): Optimales Timing / Intervall? 2. Stufe nach 5, 10 oder 20 Tagen (je N=10)
62 4 Optimales Monitoringverfahren / Validierung Tiermodell Hypothese: Regionale Nahinfrarot Spektroskopie (NIRS) korreliert mit Kollateral Perfusion / spinaler Oxigenierung in Echtzeit Etz et al., Eur J Vasc Endovasc Surg Dec;46(6):651-6 Etz et al., Eur J Cardiothorac Surg Jun;47(6):943-57
63 DIRECT SCPP MONITORING
64
65 SCPP-CATH PLACEMENT
66 SCPP = CN pressure CSF pressure
67 SCPP SCPP = CN = CNP pressure - CSF pressure: CSF pressure Five patients 9 ± 3 SA sacrificed SCPP (mmhg) p=.016 paraparesis normal recovery hours postoperatively
68 CN NIRS
69 Detection of ischemic spinal cord injury during and after extensive open or endovascular TAA/A repair utilizing SSEP and/or MEP monitoring: invasive and expensive Etz CD et al. Spinal cord perfusion after extensive segmental artery sacrifice: can paraplegia be prevented? Eur J Cardiothorac Surg 2007;31(4):643-8.
70 Spinal cord monitoring SSEP= Somatosensory evoked potentials; MEP=Motor evoked potentials SCPP=Spinal cord perfusion pressure; cnnirs=near-infrared spectroscopy of the collateral network
71 Near Infrared Spectroscopy = LIGHT (!)?
72 Collateral Network cnnirs cnnirs Image from J Thorac Cardiovasc Surg. 2011, The Collateral Network Concept: A Reassessment of the Anatomy of Spinal Cord Perfusion
73
74 FIRST IN-MAN SERIES 1 Lumbar cnnirs sensitive to X-clamping & distal perfusion 1 Diminished lumbar cnnirs = postoperative SCI* Eur J Vasc Endovasc Surg. 2013; * comparing patients with and without postoperative spinal cord injury
75 HYPOTHESIS Perfusion & oxygenation of the collateral network directly reflects spinal cord microcirculation? Can cnnirs depict spinal cord oxygenation?
76 Experimental setup Seven juvenile male pigs Subcutaneous cnnirs T5/6 and L2/3 Direct muscle and spinal cord oxygenation + flow by LDF Laser Doppler (LDF) (bottom left) Image from PlosONE Optical Monitoring and Detection of Spinal Cord Ischemia
77 Baseline Experimental Sequence X-clamping (ischemia: 8 min.) Clamp release (recovery) MAP consecutively 4 times LDF - OXYGENATION LDF cnnirs LDF - FLOW
78 Direct Invasive Laser Doppler (LDF) Collateral Network Spinal Cord Oxygenation Flo w X-clamp Clamp release
79 Direct Invasive Laser Doppler (LDF) Collateral Network Spinal Cord Oxygenation X-clamp Flo Clamp release w HYPOTHESIS: oxygenation of the CN = spinal cord?
80 Collateral Network vs. Spinal Cord CN oxygenation Spinal cord oxygenation Paraspinous CN oxygenation directly reflects spinal cord tissue oxygenation
81 Non-invasive cnnirs Lumbar cnnirs Lumbar spinal cord oxygenation Question: lumbar cnnirs = Spinal cord oxygenation?
82 cnnirs vs. Spinal Cord Oxygenation cnnirs Spinal cord oxygenation lumbar cnnirs directly reflects spinal cord tissue oxygenation
83 Conclusions 1 CN oxygenation reflects spinal cord oxygenation 1 Lumbar cnnirs reflects spinal cord oxygenation Lumbar cnnirs is an effective tool to noninvasively monitor spinal cord oxygenation
84 BP MANAGEMENT
85
86 Ultimate goal: Translation of the staged repair concept into clinical practice for ZERO PARAPLEGIA
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