Biomedical subjects
R L Hewitt
Publications and source records attributed to R L Hewitt.
Diastolic augmentation during heart bypass.
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Cerebral arterial insufficiency. Angiography and surgical treatment.
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Army heart pump for postsystolic augmentation.
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Acute arteriovenous fistulas in war injuries.
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Construction of a bifurcated arterial cannula.
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The Army system for synchronous cardiac assistance.
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Technical considerations in acute military vascular injuries of the extremities.
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An arterial cannula for extended circulatory support.
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Post-systolic myocardial augmentation with the Army artificial heart pump.
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Acute axillary-vein obstruction by the pectoralis-minor muscle.
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Aortic arch syndrome (brachiocephalic ischemia).
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History of the pump oxygenator.
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Atherosclerotic gangrene: improved results of treatment.
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Colon interposition for esophageal obstruction.
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Myocardial distribution of asanguineous solutions retroperfused under low pressure through the coronary sinus.
Asanguineous retroperfusion of the coronary sinus can penetrate a significant microvascular bed in proximity to myocardial cells. Myocardial regions permeated by this technique are located in the apex, septum, endocardium, and free wall of the left ventricle. Retrograde drainage patterns heavily favor the Thebesian-sinusoid system over the capillary-arterial route by more than a 3:1 ratio. Microscopic india ink preparations, regional flow studies, and retrograde roentgenograms indicate that asanguineous cardioplegic agents and core cooling can penetrate important regions of the heart at a microvascular level and may be an alternative route when routine antegrade perfusion via the coronary arteries is unavailable or disadvantageous. Because the flows established are primarily venous (Thebesian), the use of this route for chronic revascularization may be limited as the metabolic implications have not been fully investigated.