G.-M. von Reutern 1, I. Alpsoy 2, J. Allendörfer 2
1 Neurologische Praxis am Kardiologischen Zentrum – Bad Nauheim,
2 Asklepios Neurologische Klinik Bad Salzhausen – Nidda, Germany

Objective: Poststenotic peak systolic velocities (PSV) of < 50 cm/s of the distal internal carotid A. (ICA) were introduced as one of the main criteria to differentiate 70% vs 80% stenosis (NASCET definition) (NSRG consensus Stroke. 2012;43:916-921). There is only a sparse evidence for this threshold. Therefore we examined the PSV in patients with risk factors and arteriosclerosis (<50%). With reduced velocities the diameter of the ICA is reducing, a possible additional parameter for grading a stenosis.

Material and Methods: 100 consecutive patients (mean age 65,4 y, range 40-93, male 52%) were examined (GE Logic 7). PSV was measured as distal as possible, at least 2 cm distal to the origin. Due to the variable anatomy the exact distance was not prescribed. The distal diameter of the ICA was measured in systole, if possible with B-Mode, or B-flow imaging for its good spatial resolution.

M. Yasaka, Y. Wakugawa, M. Mori, Y. Nakanishi, Y. Okada
Kyushu Medical Center – Fukuoka, Japan

Objective: We attempted ultrasonographic evaluation of the distal extracranial internal carotid artery (ICA) in patients with extracranial ICA dissection by using the transoral carotid ultrasonography (TOCU).

Material and Methods: The subjects consisted of 5 healthy volunteers (33 ± 5 years old) and 5 extracranial ICA dissection patients (45 ± 4 years old). Examinations were performed using a color Doppler flow imaging system equipped with thin and long convex array transducers (9-5 MHz). We inserted a probe covered with thin gum transorally, touching the tip to the pharyngeal postero-lateral wall. We then attempted to detect the ICA and measure ICA diameter and flow velocity of the distal extracranial ICA by TOCU.