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Biomedical subjects

C S Shin

Publications and source records attributed to C S Shin.

8 recordsLinked to original sources
PubMed1979

The hemodynamics of extra-anatomic bypass grafts.

The hemodynamics of extra-anatomic bypass were studied with the use of right to left iliac artery bypass grafts. An arteriovenous fistula on the recipient side was used to increase the flow through the graft. Flow measurements in this model under normotensive conditions showed proportionate increases in the suprarenal aortic blood flow and in the blood flow through the segment of donor artery proximal to the bypass graft anastomosis. Stealing of blood was not observed even when the graft flow was increased to approximately 11 times the normal flow in the donor artery. Arfonad was used for producing hypotension through vasodilatation. In the presence of peripheral vasodilatation, adequate blood flow can be expected after such bypass grafts at blood pressures as low as 80 millimeters of mercury and hypotension per se does not produce vascular steal.

Animals↗
PubMed1979

Regional versus systemic heparinization.

In 12 mongrel dogs, the comparative effectiveness of systemic versus regional heparinization was studied after injecting 100 units per kilogram of heparin into a systemic vein or regionally into an artery. Activated plasma thromboplastin time was used to monitor the heparin activity, and the coagulability of blood in the general circulation was compared with the coagulability of blood in the excluded circulation distal to the vascular clamps. Both methods of heparinization were found to be equally effective. Heparin injected regionally rapidly achieves a uniform distribution in the excluded, as well as the general, circulation and, as such, cannot be called regional. There was no difference in coagulability of blood in the general circulation compared with the blood in the excluded circulation. Results of this study suggest that regional heparinization is, in fact, systemic heparinization.

Animals↗
PubMed1978

Effect of diminished distal blood flow on the morphologic changes in autogenous vein grafts.

Histologic changes in canine autogenous femoral veins were studied after interposition into the femoral artery. After a 50 per cent reduction of distal blood flow, marked fibrosis of the intima, causing narrowing of the intima and focal destruction of the internal elastic membrane and media, were found in the vein graft and the adjacent arterial segment. These changes are probably due to abnormal intraluminal pressure of femoral artery and interposed vein graft following constriction.

Animals↗
PubMed1977

His bundle electrograms in 51 patients requiring permanent transvenous pacemakers.

Fifty-one patients required the implantation of a Cordis Omnis-Stanicor permanent pacemaker. His bundle electrograms studies, which included right atrial pacing and sinoatrial (SA) node postsuppression recovery times, were performed prior to the implantations. Pacing and sensing thresholds were obtained in all patients. Syncope or episodes of dizziness were the presenting symptoms in virtually every patient. Twenty-eight of the 51 patients had the sick sinus syndrome. Only nine patients were in complete heart block, and an additional nine were in second-degree heart block. The His bundle electrogram technique was not particularly helpful in selecting the potential pacemaker candidate. The symptomatic patient with second- or third-degree heart block requires a pacemaker. In the sick sinus syndrome, the His bundle electrogram was a disappointing tool in detecting abnormalities. In chronic bundle branch block, the His bundle electrogram appears to play a major role. A prolonged H-V interval in a symptomatic patient, in whom a specific noncardiac cause cannot be identified, signifies that a pacemaker is required.

Adult↗
PubMed1975

Effect of partial constriction of the superior mesenteric artery upon absorption of d-xylose, labeled triolein and labeled albumin.

Intestinal adsorption of triolein, Risa and d-xylose was determined before and after reduction of blood flow in the superior mesenteric artery. Absorption of d-xylose did not change, but absorption of triolein and Risa appeared to be slightly improved after arterial constriction, even if the artery was completely thrombosed. Enhancement in absorption of Risa and triolein was probably the result of extensive collateral formation around the constricted superior mesenteric artery.

Animals↗
PubMed1975

Aneurysm of a polar renal artery.

A patient with a saccular aneurysm arising from the left superior polar renal artery is presented together with a review of two further reports from the literature. The importance of selective arteriography and the interpretation of the "naked calyx" sign in the diagnosis of supernumerary renal arteries has been emphasized. We feel that this is the only report of an aneurysm of a polar artery successfully treated by excision and end-to-end arterial anastomosis.

Adult↗