Background: This study compared flow to the brain with retrograde and antegrade cerebral perfusion during circulatory arrest.
Methods: Twenty-four rabbits were injected with 5 mCi of technetium-99 macroaggregated albumin, a tracer trapped in the capillaries. Group I (n = 6) were maintained normothermic, and the tracer was injected into the ascending aorta. Group II (n = 6) were maintained normothermic, and underwent cannulation of the superior vena cava (SVC), exsanguination through the aorta, and injection of the tracer into the SVC, which was proximally occluded. In group III (n = 6), the animal was cooled to 25 degrees C. The animal was exsanguinated through the aorta and tracer was injected into the ascending aorta. In group IV (n = 6), animals were cooled to 25 degrees C. The animal was exsanguinated through the ascending aorta and tracer was injected into the SVC. Three animals (group V) were exsanguinated through the ascending aorta and a retrograde venogram of the SVC was performed. Scintigraphy of groups I to IV was carried out on a digital gamma camera. Brain trapping of tracer was graded from 0 to 5, with 0 being no tracer in the brain and 5 being dominant tracer trapping in the brain.
Results: Tracer trapping in the brain showed group I, 3.67+/-0.82; group II, 0; group III, 4.67+/-0.41; group IV, 0.17+/-0.41 (p<0.0001). Retrograde venogram of the SVC showed flow into the cerebral veins.
Conclusions: Retrograde flow through the SVC reaches the cerebral venous system. Flow arriving in retrograde fashion does not go through the capillary system.
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http://dx.doi.org/10.1016/s0003-4975(99)00052-1 | DOI Listing |
J Vasc Surg Cases Innov Tech
April 2025
Department of Surgery, University of Rochester School of Medicine, Rochester, NY.
Type B aortic dissection (TBAD) represents a serious medical emergency with up to a 50% associated 5-year mortality caused by thoracic aorta, dissection-associated aneurysmal (DAA) degeneration, and rupture. Unfortunately, conventional size-related diagnostic methods cannot distinguish high-risk DAAs that benefit from surgical intervention from stable DAAs. Our goal is to use DAA stiffness measured with magnetic resonance elastography (MRE) as a biomarker to distinguish high-risk DAAs from stable DAAs.
View Article and Find Full Text PDFJ Vasc Surg Cases Innov Tech
April 2025
Atrium Health, Sanger Heart and Vascular Institute, Division of Vascular Surgery, Charlotte, NC.
We report a case of mesenteric ischemia after thoracic endovascular aortic repair (TEVAR) for chronic type B aortic dissection performed at a different institution. Computed tomography angiography findings indicated that the previous TEVAR had been deployed distally into the false lumen. To mitigate this, a large fenestration was created between the false lumen and true lumen.
View Article and Find Full Text PDFRes Pract Thromb Haemost
January 2025
Division of Vascular Surgery, St. Michael's Hospital, Toronto, Ontario, Canada.
Background: Abdominal aortic aneurysm (AAA) is characterized by the proteolytic breakdown of the extracellular matrix, leading to dilatation of the aorta and increased risk of rupture. Biomarkers that can predict major adverse aortic events (MAAEs) are needed to risk stratify patients for more rigorous medical treatment and potential earlier surgical intervention.
Objectives: The primary objective was to identify the association between baseline levels of these biomarkers and MAAEs over a period of 5 years.
J Cardiothorac Surg
January 2025
The First Hospital of Tsinghua University, Tsinghua University, Beijing, China.
Background: Patients with pulmonary atresia and ventricular septal defect (PA/VSD) are prone to progressive aortic dilation. However, there are relatively few reports of progressive development of aortic aneurysm or aortic dissection in adult patients who missed early corrective surgery.
Presentation Of Cases: Case 1: A 38-year-old man with PA/VSD and a bicuspid aortic valve (BAV), underwent VSD repair, aortic valve replacement, and PA correction at age 21.
Intern Med
January 2025
Department of Respiratory Medicine, National Hospital Organization Iwakuni Clinical Center, Japan.
Aortic intimal sarcoma is a rare disease with no established treatment and a poor prognosis. A 70-year-old man who underwent surgery for a mass shadow extending from the ascending aorta to the left common carotid artery on contrast-enhanced computed tomography was diagnosed with intimal sarcoma and underwent postoperative radiotherapy (66 Gy/33 Fr). Three brain metastases were identified after 1.
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