H. M. Keller

Learn More
92 patients with fibromuscular hyperplasia (FMH) seen at the University Hospital Zurich were studied. Renovascular FMH was the most frequent manifestation of the disease (89%). FMH of the cerebral arteries was seen in 26%. The intestinal and subclavian arteries were involved in 9% each and the iliac arteries in 5% of the patients. In 2 patients each FMH of(More)
The patency of the external carotid artery (ECA) and internal carotid artery (ICA) in the presence of an occlusion of the common carotid artery (CCA) was evaluated in 7 patients with a symptomatic CCA occlusion by the combined application of cerebrovascular Doppler examination (cv-Doppler) based on continuous-wave equipment and sequential(More)
A transoral noninvasive procedure in the oropharynx using local anesthesia was applied to detect flow in the vertebral arteries with a bidirectional continuous-wave Doppler ultrasound system. Common carotid artery compression was used to identify the vertebral artery. Flow direction, amplitude of flow signals, diastolic flow, and reaction of flow on common(More)
Subcortical and early cortical median nerve somatosensory evoked potentials (SEPs) were examined in 26 patients in hypoxic coma. The amplitude ratio between the negative slope of the scalp response and the following positive trough was determined. The latency difference between the major negative component recorded from the upper neck, N14, and the initial(More)
The healing time relation of 30 gastric and 15 duodenal ulcers was assessed by repeated endoscopic measurements of ulcer size on days 1, 21, and 42 of a 6-week period, during which a selected population of patients was being treated as outpatients on an inert placebo. Antacids in small amounts were only given in case of ulcer pain. There was evidence for a(More)
To detect stenosis in the carotid artery with a bidirectional continuous-wave Doppler ultrasound device, the following noninvasive procedure, applied on 800 patients and compared with 249 angiograms of 186 patients, has proved to be about 90% reliable. Measurements of flow signals were taken over the terminal branches of the ophthalmic artery(More)
A computer-controlled 14-channel pulsed Doppler ultrasound instrument was used as a noninvasive means to evaluate instantaneous velocity profiles and flow in the comlon carotid arteries of 22 healthy persons and in 22 patients. Of the later, 13 had severe obstructions of the extracranial portion of the carotid artery, four had obstruction of the(More)
Between 1973 and 1978 spontaneous lysis of obstructions in an external cerebral artery was detected in seven out of 3500 patients who suffered from symptoms of cerebrovascular failure in the territory of the internal carotid or vertebral artery. All patients underwent our routine cerebrovascular Doppler ultrasound examination. In the seven patients a high(More)