Preface to the Fifth Edition

Zwiebel, William J.; Pellerito, John S.

doi:10.1016/b978-0-7216-0631-6.50005-1

Cited by 27 publications

(62 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Stenosis was defined according to the North American Symptomatic Carotid Endarterectomy Trial (NASCET) criteria [11] using peak systolic velocity measurements as previously described [12,13,14]. The carotid artery contralateral to the side of the body affected by the stroke symptoms was defined as symptomatic.…”

Section: Methodsmentioning

confidence: 99%

Lack of Association of White Matter Lesions with Ipsilateral Carotid Artery Stenosis

et al. 2012

View full text Add to dashboard Cite

Background: White matter lesions (WML) are commonly seen on brain MRI and are generally considered a marker of tissue damage from cerebral small vessel disease. WML are associated with increasing age and vascular risk factors, but their precise cause is unknown. A role for carotid artery atherothromboemboli has been suggested. If this is the case, more WML would be expected ipsilateral to increasing degrees of carotid stenosis. Methods: We recruited patients with ischaemic stroke from two large, separate prospective stroke studies, assessed with brain MRI and carotid Doppler ultrasound. We scored hemispheric WML visually in periventricular and deep locations. We assessed the association between carotid stenosis asymmetry and WML asymmetry, and vice versa. Further, we assessed the association between carotid stenosis and ipsilateral WML, before and after adjusting for vascular risk factors, and tested associations between ipsilateral and contralateral stenoses and WML. Results: We recruited 247 (Study 1) and 253 (Study 2) patients. In Study 1 and Study 2, 36 (15%) and 29 (11%) patients had ≥50% carotid stenosis, and 27 (11%) and 15 (6%) had ≥70% stenosis, respectively. Carotid stenosis was asymmetric in 28 (11%) and 26 (10%) patients and WML were asymmetric in 22 (9%) and 11 (4%) patients in Study 1 and Study 2, respectively. We found no association between carotid stenosis and ipsilateral WML score, before or after adjusting for vascular risk factors or sidedness, but WML were strongly associated with increasing age (p < 0.001). Conclusion: In two large cohorts of ischaemic stroke patients, we found no association between carotid stenosis and ipsi- or contralateral WML. There is now substantial evidence that atherothromboemboli are unlikely to cause most WML or other forms of cerebral small vessel lesions. Future studies should focus on determining what causes the intrinsic small vessel pathological changes that appear to underlie most WML.

show abstract

Section: Methodsmentioning

confidence: 99%

Lack of Association of White Matter Lesions with Ipsilateral Carotid Artery Stenosis

et al. 2012

View full text Add to dashboard Cite

show abstract

“…In this regard, some of the colour-flow signals often extended beyond the anechoic band and even appeared to involve the granulosa. This may have involved, at least in part, an artifact wherein the signal extends beyond the vessel walls (Zwiebel & Pellerito 2005). Considering that the blood vessels are expected to be in the theca externa and that the anechoic band is in close apposition to the granulosa, it is likely that the anechoic band involved both the theca externa and theca interna.…”

Section: Discussionmentioning

confidence: 99%

“…A similar approach has been used in women, although it is not clear whether a single selected image or the entire real-time scan was evaluated (Chui et al 1997, Bhal et al 1999, Coulam et al 1999. In the present experiment, the transducer was held at various angles to get the maximum overall colour signal throughout the circumference of the follicular wall; the angle between the ultrasound beam and arterial flow affects the detectability and extent of the colour signals (Zwiebel & Pellerito 2005). The prominence of the colour displays was based on intensity and thickness, and was Figure 1 Sequential B-mode ultrasonograms of preovulatory follicles of two mares at different hours after the largest follicle reached $35 mm (hour 0, treatment time).…”

Section: End-pointsmentioning

confidence: 99%

Relationships of changes in B-mode echotexture and colour-Doppler signals in the wall of the preovulatory follicle to changes in systemic oestradiol concentrations and the effects of human chorionic gonadotrophin in mares

Gastal¹,

Gastal²,

Ginther³

2006

Reproduction

View full text Add to dashboard Cite

A duplex grey-scale and colour-Doppler ultrasound instrument was used to study the changes in the wall of the preovulatory follicle in mares. When the follicle reached $35 mm (hour 0), mares were randomized into control (n 5 16) and human chorionic gonadotropin (hCG)-treated (n 5 16) groups. The hCG treatment was given at hour 0. Scanning was done every 12 h until hour 36, every hour between hours 36 and 48, and every 12 h thereafter until ovulation. Blood was sampled every 12 h for oestradiol assay. During the period 0-24 h post-treatment, oestradiol concentrations decreased in the hCG group and increased in the controls (significant interaction). During the period 0-36 h post-treatment, thickness and echogenicity of the granulosa increased in the hCG group but not in the controls. During the period 36 to 12 h before ovulation, granulosa and colour-Doppler end-points increased in the control and hCG groups (hour effects), while oestradiol was decreasing in both groups. The prominence and percentage of follicle circumference with an anechoic band peripheral to the granulosa and colour-Doppler signals in the follicle wall, indicating arterial blood flow, decreased during the period 4 to 1 h before ovulation (hour effects). Results indicated that the ultrasonographic changes of the wall of the preovulatory follicle were not associated temporally with changes in oestradiol concentrations and prominence of an anechoic band, and colour-Doppler signals decreased during the few hours before ovulation. The hypothesis that the latter portion of the ovulatory LH surge has a negative effect on systemic oestradiol was supported by the immediate decrease in oestradiol concentrations when hCG was injected.

show abstract

“…Color Doppler US can easily identify arteries by finding round objects with regular pulsation and can be used to detect stenotic or occluded segments [4,8]. Pulsed-wave Doppler US can show the exact flow velocity of each arterial segment and determine the degree of severity of the stenosis based on an analysis of the pulsed-wave Doppler spectral waveform [9]. …”

Section: Introductionmentioning

confidence: 99%

Doppler ultrasonography of the lower extremity arteries: anatomy and scanning guidelines

Hwang

2017

Ultrasonography

View full text Add to dashboard Cite

Doppler ultrasonography of the lower extremity arteries is a valuable technique, although it is less frequently indicated for peripheral arterial disease than for deep vein thrombosis or varicose veins. Ultrasonography can diagnose stenosis through the direct visualization of plaques and through the analysis of the Doppler waveforms in stenotic and poststenotic arteries. To perform Doppler ultrasonography of the lower extremity arteries, the operator should be familiar with the arterial anatomy of the lower extremities, basic scanning techniques, and the parameters used in color and pulsed-wave Doppler ultrasonography.

show abstract

Preface to the Fifth Edition

Cited by 27 publications

References 0 publications

Lack of Association of White Matter Lesions with Ipsilateral Carotid Artery Stenosis

Lack of Association of White Matter Lesions with Ipsilateral Carotid Artery Stenosis

Relationships of changes in B-mode echotexture and colour-Doppler signals in the wall of the preovulatory follicle to changes in systemic oestradiol concentrations and the effects of human chorionic gonadotrophin in mares

Doppler ultrasonography of the lower extremity arteries: anatomy and scanning guidelines

Contact Info

Product

Resources

About