Open supra-aortic revascularization and arch reconstruction after previous TEVAR in a complex arch anatomy

2021 ◽  

We propose a technique to minimize the neurological and systemic risks involved in rerouting the blood flow toward the brain in a “single remaining vessel” configuration with a 90% stenosis by means of complete hypothermic cerebral protection associated with normothermic systemic blood flow with a “restitutio ad integrum” of the supra-aortic trunks flow. The perfusion of the brain and the arms was almost completely separated from the systemic perfusion by the deployment 1 year before of a thoracic endoprosthesis in association with complete chronic occlusion of the brachiocephalic trunk and a functioning carotid-subclavian bypass. The Free Flow of the prosthesis, which acted as a hook, moved the calcium toward the left carotid ostium, creating a 90% stenosis with intermittent acute cerebral hypoperfusion and amaurosis. We achieved an optimal result: The patient was discharged on postoperative day 7 with no neurological problems and with patency and direct blood flow in all the supra-aortic trunks.

Author(s):  
Hans T. Versmold

Systemic blood pressure (BP) is the product of cardiac output and total peripheral resistance. Cardiac output is controlled by the heart rate, myocardial contractility, preload, and afterload. Vascular resistance (vascular hindrance × viscosity) is under local autoregulation and general neurohumoral control through sympathetic adrenergic innervation and circulating catecholamines. Sympathetic innovation predominates in organs receivingflowin excess of their metabolic demands (skin, splanchnic organs, kidney), while innervation is poor and autoregulation predominates in the brain and heart. The distribution of blood flow depends on the relative resistances of the organ circulations. During stress (hypoxia, low cardiac output), a raise in adrenergic tone and in circulating catecholamines leads to preferential vasoconstriction in highly innervated organs, so that blood flow is directed to the brain and heart. Catecholamines also control the levels of the vasoconstrictors renin, angiotensin II, and vasopressin. These general principles also apply to the neonate.


1971 ◽  
Vol 61 (4) ◽  
pp. 570-586 ◽  
Author(s):  
Martin H. Lees ◽  
Rodney H. Herr ◽  
John D. Hill ◽  
Clarence L. Morgan ◽  
A. John Ochsner ◽  
...  

1961 ◽  
Vol 16 (5) ◽  
pp. 827-830 ◽  
Author(s):  
Y. K. Byon ◽  
E. F. Adolph

An oxygen electrode and a thermistor were placed in the brain stem, leg muscle, or abdomen of a rat cooled to 17—15 C. When the rat was thereafter kept at 16∘the electrode usually showed a steady current. At 13—11∘ the apparent Po2 of tissue in most instances diminished during 2—3 hr unless artificial breathing was given. Forced breathing of air or oxygen ordinarily raised the Po2; of nitrogen usually, but not always, lowered the Po2. When the apparent Po2 was not thus raised or lowered, the flow of blood to the one tissue being examined, but not necessarily to all tissues, was evidently inadequate. The heart could be stopped reversibly by further cooling to 9—5∘; brain Po2 diminished only gradually at that low temperature. Survival was assured by a Po2 that was high and steady, but often occurred also after a diminishing or zero Po2. In the hypothermic rat, either pulmonary ventilation or systemic blood flow or an unidentified factor could limit the rat's survival. Submitted on October 26, 1960


Thorax ◽  
1985 ◽  
Vol 40 (2) ◽  
pp. 160-160
Author(s):  
W. C Little

2014 ◽  
Vol 9 (3) ◽  
pp. 171-176 ◽  
Author(s):  
Renato Filogonio ◽  
Edwin W. Taylor ◽  
Laura B.T. Carreira ◽  
Gabrielle S.P.C. Leite ◽  
Augusto S. Abe ◽  
...  

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