Spinal Cord Protection During Thoracic and Thoracoabdominal Endovascular Aortic Repair: 5-Year Results of a Preventive Protocol Including Prophylactic Cerebrospinal Fluid Drainage in High-Risk Patients

Abstract

Purpose:

Spinal cord injury (SCI) is a devastating complication of thoracoabdominal aortic (TAA) repair. The use of prophylactic cerebrospinal fluid drainage (CSFD) as part of a protective protocol during endovascular repair is controversial. This article reports the results of the prophylactic use of CSFD as part of the of a prevention protocol implemented in 2016.

Methods:

Retrospective review of spinal cord outcomes (SCI rate and CSFD-related complications) in patients treated endovascularly for TAA disease at a single institution from 2016 (implementation of an institutional SCI risk reduction protocol) to 2021. Patients were classified as high risk (≥2 factors), intermediate risk (1 factor), or low risk (0 factor). Only high-risk patients without contraindications underwent a prophylactic CSFD placement.

Results:

One hundred eighty-one patients were analyzed (124 males; 69.6 years): 130 (69%) aneurysms (n=24 thoracic, n=28 Crawford 1–2–3, and n=78 Crawford 4/pararenal), 35 (19.9%) chronic aneurysmal dissections, and 16 (8.8%) acute complicated type B dissections. Interventions were staged in 31 (17.2%) cases, and consisted of 74 (41%) Thoracic EndoVascular Aneurysm Repair (TEVAR) and 107 (59%) Fenestrated Branched EndoVascular Aneurysm Repair (F-BEVAR). Sixty-nine (38.1%) patients were identified as being at high risk of SCI and CSFD was used prophylactically in 64 of them (4 failures and 1 contraindication). Spinal cord injury occurred in 8 cases (4 paraparesis, 4 paraplegias including 2 permanent), of which 3 had a prophylactic CSFD and 5 underwent rescue drainage. In addition, 4 patients developed SCI related to prophylactic CSFD (intradural hematoma), resulting in 1 paraparesis and 3 paraplegias. Other CSFD-related complications were mild (6) or moderate (2), for a total of 12 complications (17%). Factors associated with major drain complications were: curative anticoagulation 36 hours after drain removal (n=1), multiple punctures (n=1), platelet count <100 000 at drain removal (n=1), and bipolar disorder (n=2). Overall, 4 patients had permanent paraplegia and 1 had sphincter dysfunction at the last follow-up. Mean follow-up was 17 months. Mortality was 4.4% at 30 days and 13.3% at 18 months, including 3 (1.6%) aortic-related deaths.

Conclusions:

With the protocol we used to protect the spinal cord, we report results comparable with the SCI literature and highlight the risks associated with prophylactic CSFD use, which requires a better understanding of contraindications.

Keywords

aortic aneurysm endovascular aortic repair aorta TEVAR FEVAR cerebrospinal fluid drainage spinal cord injury spinal cord ischemia paraplegia

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