Biomedical subjects

J B Towne

Publications and source records attributed to J B Towne.

146 records · Page 9Linked to original sources

PubMedDate not supplied

Supraorbital Doppler evaluation in vascular surgery.

Directional Doppler examination of the supraorbital vessels is an effective, noninvasive method of evaluating patency of the internal carotid artery. In the presence of occlusive disease in the internal carotid artery, flow in the superficial temporal and frontal artery is reversed so that blood flows in a retrograde fashion into the orbit, providing valuable collateral circulation to the brain. Using these basic anatomical and physiological facts, the direction of arterial flow in the supraorbital vessels and the response to compression of the superficial temporal and facial arteries were measured with the directional Doppler. Evaluation of 125 carotid arteries in 63 patients by both arteriography and Doppler examination established an overall accuracy of 87 percent by the Doppler supraorbital test. This study demonstrated the value of carotid Doppler examination in the evaluation of extracranial cerebral circulation.

Arterial Occlusive Diseases↗

PubMedDate not supplied

Noninvasive assessment of toe systolic pressures with special reference to diabetes mellitus.

Toe and ankle systolic blood pressures were measured noninvasively in asymptomatic volunteers and in patients with peripheral arterial obstructive disease. The measurement of ankle pressure was falsely elevated in 23% (51/219) of the diseased limbs studied, as a consequence of partial or total vessel incompressibility caused by arterial calcification and rigidity. Eighty percent (41/51) of limbs with erroneous ankle pressure readings were from patients with diabetes mellitus. Toe pressure was the most reliable indicator of occlusive disease, and was able to assess disease distal to the ankle. Five groups were separated using the ankle-brachial and the toe-ankle systolic pressure ratios: normal, claudication, limb salvage, claudication/incompressible arteries, and limb salvage/incompressible arteries. Insulin dependent and orally-medicated diabetics predominated in the two groups with incompressible arteries. The toe-brachial systolic pressure ratio was an accurate hemodynamic indicator of total peripheral arterial obstructive disease.

Ankle↗