Ultrasonic Doppler examination with spectral waveform has been used for the classification and surveillance of carotid artery stenosis for over 25 years. Progression/regression between examinations can be identified with 95% confidence if the velocity measurements change by more than two times the root mean square difference (RMSD) of the repeat measurement. Peak systolic velocity and end diastolic velocity measurements at a Doppler angle of 60 degrees were repeated in 47 carotid examinations. Measurement difference between sonographers and between instruments was tabulated. Root mean square difference was 11 cm/s (RMS%D = 11%) for systolic and 7 cm/s (RMS%D = 21%) for diastolic velocity measurements (excluding one severe stenosis case). Results for differences between sonographers and between instruments were similar to the overall results. In serial arterial studies using this Doppler velocimetry method, a difference exceeding 23 cm/s (21%) systolic, or 14 cm/s (42%) diastolic velocity indicates a significant (2 x RMSD) hemodynamic change.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ultrasmedbio.2008.12.012 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Relationship of maternal ophthalmic artery Doppler with uterine artery Doppler, hemodynamic indices and gestational age: prospective MATERA study.
Ultrasound Obstet Gynecol
January 2025
Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, UK.
Objectives: To examine the relationship of ophthalmic artery (OA) Doppler indices with uterine artery (UtA) Doppler indices, selected maternal hemodynamic parameters and gestational age, and to evaluate the intraobserver reproducibility of OA Doppler indices.
Methods: This was a prospective cohort study of women recruited between 11 + 0 and 23 + 6 weeks' gestation using a stratified and random sampling approach to ensure adequate distribution across the gestational-age range. OA pulsatility index (PI), first peak systolic velocity (PSV1), second peak systolic velocity (PSV2) and peak systolic velocity ratio (PSV ratio), calculated as PSV2/PSV1, were measured twice in each eye by the same observer.
Anesthetic Management of a Patient With Arnold Chiari Malformation and Syringomyelia During Laparoscopic Surgery With Neurologic Monitoring: A Case Report.
A A Pract
January 2025
Département d'Anesthésie, Hôpital Antoine Béclère, APHP.Université Paris-Saclay, Clamart, France.
We describe a patient with severe Arnold Chiari Malformation and syringomyelia who underwent gynecological laparoscopy in an emergency context; no brain imaging was available. We here report the successful use of optic nerve sheath diameter (ONSD) and middle cerebral artery (MCA) velocity measurements as surrogate monitoring for cerebral blood flow and intracranial pressure, respectively. MCA velocity was low when assessed after peritoneal insufflation and ONSD increased to 6.
View Article and Find Full Text PDFPreoperative vascular dysfunction is associated with acute kidney injury after cardiac surgery.
J Thorac Dis
December 2024
Department of Cardiovascular Surgery, Ageo Central General Hospital, Saitama, Japan.
Background: Cardiac surgery-associated acute kidney injury (CSA-AKI) results in poor prognosis. Several risk factors for CSA-AKI have been reported, including preoperative creatinine level, cardiopulmonary bypass time, and perioperative blood pressure management. Only few studies have reported the effect of vascular stiffness on the incidence of CSA-AKI, and there are is no study reporting on endothelial function and its association with CSA-AKI.
View Article and Find Full Text PDFImpact of Shale Barriers on Steam Chamber Evolution and Heat Distribution during the Rising Stage of Steam-Assisted Gravity Drainage (SAGD).
ACS Omega
January 2025
State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China.
Shale barriers negatively impact thermal recovery processes of oil sand or ultraheavy oil, particularly during the rising stage of SAGD, by affecting oil flow, steam chamber evolution, and heat distribution. Existing mathematical models for the rising stage of SAGD often overlook the influence of shale barriers on the evolution of the steam chamber and heat distribution. This study includes experiments to investigate the impact of a single shale barrier above the production well during the rising stage of the SAGD.
View Article and Find Full Text PDFGait speed assessment in confined spaces: Development of a novel automated 4-m static-start test to measure dynamic-start gait speed.
Geriatr Gerontol Int
January 2025
Medicine Academic Programme, Duke-NUS Graduate Medical School, Singapore.
Objectives: To promote standardization and feasible measurements of gait speed across the field, we developed a device that used light detection and ranging (LiDAR) technology to measure gait speed from a standing-start testing procedure conducted on a 4-m total walkway. We compared this automated (LiDAR-based) standing-start 4-m gait speed test (AS-4MG) with automated and manual (stopwatch-based) dynamic-start 4-m gait speed tests (AD-4MG and MD-4MG, respectively) on between-method agreement, measurement repeatability, and predictive validity with functional outcomes.
Methods: A sample of 48 community-dwelling adults (mean [SD], 69 [9] years) participated in this method comparison study.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!