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Biomedical subjects

T A Sos

Publications and source records attributed to T A Sos.

At least 73 records · Page 4Linked to original sources
PubMed1982

Percutaneous transluminal angioplasty of the popliteal artery and its branches.

Percutaneous transluminal angioplasty (PTA) of the popliteal artery and its branches was performed for relief of ischemia of the leg. Thirty-four procedures were performed in 31 patients (bilateral in 1 and repeated in 2). Angioplasty was technically successful in 29 cases (85%), with immediate clinical improvement in 26 (89%). The mean ankle-arm pressure index rose from 0.28 to 0.77. Long-term noninvasive follow-up in 23 of 26 patients with initial clinical improvement demonstrated reocclusion in 6 (2 of whom had successful redilatation) and continued patency in 13 who were followed up for 3 to 29 months (average, 11.6 mo.); the mean ankle-arm pressure index was 0.71 and the cumulative patency rate at 2 years was 57%. Six patients died, though all were asymptomatic. Since many of these procedures are performed for limb salvage in patients who would not benefit from surgery, PTA is useful in providing acute and often prolonged relief of ischaemia of the leg.

Aged↗
PubMed1981

The effect of coronary artery bypass on collateral circulation.

The effect of coronary bypass upon collateral circulation (CC) was studied in 69 bypassed coronary arteries in which CC was seen on either the preoperative or postoperative angiogram or both. CC proved to be a highly reliable indicator of bypass effectiveness. Persistence or new development of CC on postoperative angiograms invariably indicated complete bypass obstruction or inadequate revascularization. Disappearance of preexisting CC on postoperative angiograms almost always indicated bypass patency. Occlusion of a bypass does not appear to jeopardize preexisting CC or prevent new CC from developing in most cases.

Adult↗
PubMed1980

A method for understanding three-dimensional coronary anatomy.

A simple method for interpreting and reviewing the anatomy of the coronary arteries as seen on angiograms uses the concept of two imaginary circles around the interventricular and atrioventricular grooves, respectively. The hands and fingers of the viewer are used to res in various angiographic projections may be properly understood.

Angiography↗
PubMed1980

Penile flow index utilizing a Doppler pulse wave analysis to identify penile vascular insufficiency.

A Doppler ultrasound probe was used in 42 men to evaluate penile circulation. Twenty-six patients had confirmation of vascular anatomy by pelvic arteriography. The average penile acceleration (peak velocity over pulse rise time) relative to the radial artery acceleration was expressed as the penile flow index. Eleven potent men had a penile flow index of 3.4 plus or minus 0.4 standard error, while 13 impotent men with vascular disease on arteriography had a penile flow index of 21.7 plus or minus 5 standard error (p less than 0.01). Patients with intermediate penile flow index values had variable degrees of erectile failure. This relatively simple, non-invasive technique identifies a vascular component of impotence, thus aiding in the selection of appropriate management.

Erectile Dysfunction↗
PubMed1980

Percutaneous transluminal dilation in renal transplant arterial stenosis.

Twelve hypertensive patients underwent percutaneous transluminal dilation (PTD) for relief of arterial stenosis complicating renal allotransplantation. Two patients underwent repeat PTD for recurrent stenosis and hypertension. Six patients had end to end anastomosis of the donor renal artery to the recipient hypogastric artery; four of six PTDs were successful. Six patients had end to side anastomosis of the donor renal artery to the recipient external iliac artery; seven of eight PTDs, including one of two repeat PTDs, were successful. Prior to PTD, all patients were using several antihypertensive medications. Following successful PTD, the mean blood pressure dropped from 184 +/- 15/118 +/- 9 to 133 +/- 13/89 +/- 11 mm Hg (P < 0.001) and remained at that level for up to 15 months (average followup 9 months) with decreased or no antihypertensive medications. Since surgical correction of arterial stenosis occurring after renal transplantation is difficult and may endanger the graft, PTD should be the first interventional therapy.

Adult↗
PubMed1980

A simple method of teaching three-dimensional coronary artery anatomy.

A simple method of teaching the three-dimensional anatomy of the coronary arteries is presented. The technique utilizes the concept of two imaginary circles around the interventricular and atrioventricular grooves, respectively. The hands and fingers of the trainee and/or a demonstrator are used to represent the various cardiac structures.

Anatomy↗
PubMed1980

Percutaneous transluminal angioplasty in renal transplant arterial stenosis for relief of hypertension.

Seven hypertensive patients underwent percutaneous transluminal angioplasty (PTA) for relief of arterial stenosis complicating renal allotransplantation. Four had end-to-end anastomosis of the donor renal artery to the recipient hypogastric artery; all PTA's were successful. Three patients had end-to-side anastomosis of the donor renal artery to the recipient external iliac artery; 2/3 PTA's were successful. Prior to PTA, all patients were using several antihypertension medications. Following successful PTA, the mean blood pressure fell from 190 +/- 10/120 +/- 5 to 132 +/- 16/86 +/- 9 mm Hg (p less than 0.01) and remained at that level for up to six months (average follow-up 2.85 months) with decreased or no antihypertension medications. Since surgical correction of arterial stenosis is difficult and may endanger the transplant kidney, PTA should be attempted first.

Adult↗
PubMed1980

Popliteal artery branches: percutaneous transluminal angioplasty.

Percutaneous transluminal angioplasty of the branches of the popliteal artery was performed in six patients, two of whom also had femoropopliteal angioplasty. Dilatation was performed with catheters ranging from 5.5 to 7 French. None of the popliteal branch dilatations was performed with an inflated balloon. Excellent dilatation, as documented by angiography and Doppler ultrasound pressure recordings, was obtained in four cases and moderate and slight improvement in one case each. Two of the four patients with excellent results had prompt healing of toe amputations and are doing well at 19 and 22 months after angioplasty. In the other two patients with excellent results, below-knee amputation was necessary despite patency of the dilated segment in one. In the other patient with initially excellent results, reocclusion occurred 4 months after angioplasty. In the patients who had moderate and slight improvement on angiography and in distal pressures, no significant clinical course change occurred. No patient had clinical deterioration after angioplasty and no significant complications occurred.

Aged↗
PubMed1980

Percutaneous transluminal angioplasty of nonatherosclerotic lesions.

Percutaneous transluminal angioplasty (PTA) was attempted on 16 nonatherosclerotic lesions in 14 patients. Dilatation was initially successful in 4/4 cases with renal artery stenosis due to fibromuscular dysplasia (three) and Takayasu arteritis (one); all patients became normotensive and remain normotensive on no antihypertensive medications, at up to 12 months follow-up. PTA was technically successful in 4/5 transplant renal artery stenosis; these four patients remain normotensive or almost normotensive on no or markedly reduced antihypertensive medications, at up to 14 months followup. Initial success was obtained in 3/3 lesions involving vascular grafts; in one, the patient became and remained asymptomatic for the remaining 5 months he lived; in another, occlusion of the dilated segment and the graft occurred 8 months after PTA; and in the third, symptoms and signs of the limb ischemia returned within 24 hr of PTA. PTA was initially successful in a patient with recurrent celiac artery stenosis after surgery for median arcuate ligament syndrome; she has remained free of symptoms for 18 months. In a patient with three radiation-induced stenoses, PTA was initially successful; this patient is asymptomatic at 20 months follow-up. The medial type of fibromuscular dysplasia dilates most easily, suggesting a concentric stretching and some shearing of the fibrous tissue, which then heals in its dilated state. Intimal fibroplasia may be eccentric, and concentric stretching during dilatation may not be possible, leading to less satisfactory results. Radiation-induced stenosis involves periarterial fibrosis and arterial wall thickening, and the results in PTA of many of these lesions may be less satisfactory than reported here. The responsiveness of graft stenoses will vary with the cause; anastomotic stenoses will probably dilate easily, for they involve either concentric intimal proliferation, or a small degree of periarterial fibrosis; graft stenoses surrounded by dense fibrous tissue may respond initially to PTA, but the long-term results will probably be poor due to recurrent graft constriction.

Adult↗