Spinal cord blood flow and ischemic injury after experimental sacrifice of thoracic and abdominal segmental arteries.
OBJECTIVE
Spinal cord blood flow (SCBF) after sacrifice of thoracoabdominal aortic segmental arteries (TAASA) during thoracoabdominal aortic aneurysm (TAAA) repair remains poorly understood. This study explored SCBF for 72 h after sacrifice of all TAASA.


METHODS
Fourteen juvenile Yorkshire pigs underwent complete serial TAASA sacrifice (T4-L5). Six control pigs underwent anesthesia and cooling to 32 degrees C with no TAASA sacrifice. In the experimental animals, spinal cord function was continuously monitored using motor evoked potentials (MEPs) until 1h after clamping the last TAASA. Fluorescent microspheres enabled segmental measurement of SCBF along the entire spinal cord before, and 5 min, 1 h, 5 h, 24 h and 72 h after complete TAASA sacrifice. A modified Tarlov score was obtained for 3 days after surgery.


RESULTS
All the pigs with complete TAASA sacrifice retained normal cord function (MEP) until 1h after TAASA ligation. Seven pigs (50%) with complete TAASA sacrifice recovered after 72 h; seven pigs suffered paraparesis or paraplegia. Intraoperatively, and until 1h postoperatively, SCBF was similar among the three groups along the entire cord. Postoperatively, SCBF did not decrease in any group, but significant hyperemia occurred at 5h in controls and recovery animals, but did not occur in pigs that developed paraparesis or paraplegia in the T8-L2 segments (p=0.0002) and L3-S segments (p=0.0007). At 24h, SCBF remained marginally lower from T8 caudally; at 72h, SCBF was similar among all groups along the entire cord. SCBF in the segments T8-L2 at 5h predicted functional recovery (p=0.003).


CONCLUSIONS
This study suggests that critical spinal cord ischemia after complete TAASA sacrifice does not occur immediately (intraoperatively), but is delayed 1-5h or longer after clamping, and represents failure to mount a hyperemic response to rewarming and awakening. The short duration of low SCBF associated with spinal cord injury suggests that hemodynamic and metabolic manipulation lasting only 24-72 h may allow routine preservation of normal cord function despite sacrifice of all TAASA secondary to surgical or endovascular repair of large TAAA.
Etz
Christian D
CD
Department of Cardiothoracic Surgery, Mount Sinai School of Medicine, New York, NY, USA. christian.etz@mountsinai.org
Homann
Tobias M
TM
Luehr
Maximilian
M
Kari
Fabian A
FA
Weisz
Donald J
DJ
Kleinman
George
G
Plestis
Konstadinos A
KA
Griepp
Randall B
RB
D000818:Animals; D017545:Aortic Aneurysm, Thoracic / Q000601:surgery*; D003097:Collateral Circulation; D004195:Disease Models, Animal; D019054:Evoked Potentials, Motor; D005260:Female; D008863:Microspheres; D010264:Paraplegia / Q000209:etiology; D011183:Postoperative Complications; D020127:Recovery of Function; D012039:Regional Blood Flow; D012720:Severity of Illness Index; D013116:Spinal Cord / Q000098:blood supply* / Q000473:pathology / Q000503:physiopathology; D020760:Spinal Cord Ischemia / Q000209:etiology* / Q000473:pathology; D034421:Sus scrofa