Communications To the Editor and Case Reports

Perry, M.O. : Progress in peripheral vascular surgery. West. J. Med., 124: 194-218, 1976.

Brockenbrough, E.C. : Screening for the prevention of stroke: Use of a Doppler flowmeter . Seattle, Parks Electronics, 1970 .

Gee, W. , et al.: Ocular pneumoplethysmography in carotid artery disease. Med. In-strum., 8: 244, 1974.

Yao, J.S.T. , et al.: Blood flow laboratory of the department of surgery. Evanston, Illinois, Northwestern University Medical School.

Kartchner, M.M. , et al.: Non-invasive detection and evaluation of carotid occlusive disease. Arch. Surg., 106: 528, 1973.

Carter, S.A. : Response of ankle systolic pressure to leg exercise, in mild or questionable arterial disease. N. Engl. J. Med., 287: 578-582, 1972.

Cranley, J.J. , et al.: Phleborneographic technique for diagnosing deep venous thrombosis of the lower extremities. Surg. Gynecol. Obstet., 141: 331-339, 1975.

Hume, M. , et al.: Extent of leg vein thrombosis determined by impedence and 125-1-fibrinogen. Vascular Laboratory, Department of Surgery, Lemuel Skattuck Hospital, Tufts University School of Medicine, Boston, 1974.

Johnston, K.W. , et al.: A simple method for detecting deep vein thrombosis. Am. J. Surg., 127: 349-352, 1974.

Hass, W.K. , et al.: Joint study of extracranial arterial occlusion. J.A.M.A., 203: 961, 1968.

Thompson, J.E. , et al.: Carotid endarterectomy for cerebrovascular insufficiency (stroke): Follow-up of 359 cases. Ann. Surg. , 163: 751, 1966.