AI Article Synopsis
- The study examined whether Doppler measurements of blood flow in the carotid and femoral arteries could effectively detect changes in cardiac index during a passive leg raising (PLR) test.
- The results indicated that poor quality of doppler signals limited the ability to measure changes in blood flow, leading to inconclusive findings regarding the effectiveness of these measurements in detecting positive PLR responses and tracking changes in cardiac output.
- Ultimately, the research concluded that Doppler assessments of carotid and femoral blood flow are not reliable indicators for evaluating cardiac output and its variations.
Article Abstract
Background: The hemodynamic effects of the passive leg raising (PLR) test must be assessed through a direct measurement of cardiac index (CI). We tested whether changes in Doppler common carotid blood flow (CBF) and common femoral artery blood flow (FBF) could detect a positive PLR test (increase in CI ≥ 10%). We also tested whether CBF and FBF changes could track simultaneous changes in CI during PLR and volume expansion. In 51 cases, we measured CI (PiCCO2), CBF and FBF before and during a PLR test (one performed for CBF and another for FBF measurements) and before and after volume expansion, which was performed if PLR was positive.
Results: Due to poor echogenicity or insufficient Doppler signal quality, CBF could be measured in 39 cases and FBF in only 14 cases. A positive PLR response could not be detected by changes in CBF, FBF, carotid nor by femoral peak systolic velocities (areas under the receiver operating characteristic curves: 0.58 ± 0.10, 0.57 ± 0.16, 0.56 ± 0.09 and 0.64 ± 10, respectively, all not different from 0.50). The correlations between simultaneous changes in CI and CBF and in CI and FBF during PLR and volume expansion were not significant (p = 0.41 and p = 0.27, respectively).
Conclusion: Doppler measurements of CBF and of FBF, as well as measurements of their peak velocities, are not reliable to assess cardiac output and its changes.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5975047 | PMC |
| http://dx.doi.org/10.1186/s13613-018-0413-7 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Evaluation of SMA-13 Asphalt Mixture Reinforced by Different Types of Fiber Additives.
Materials (Basel)
November 2024
Department of Architecture Built Environment and Construction Engineering, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milan, Italy.
This research aims at systematically evaluating the properties of SMA-13 asphalt mixture reinforced by several fiber additives including flocculent lignin fiber (FLF), granular lignin fiber (GLF), chopped basalt fiber (CBF), and flocculent basalt fiber (FBF). Firstly, the thermal stability, moisture absorption, and oil absorption property of these fiber additives were analyzed. Secondly, the property of SMA-13 reinforced using four types of single fibers and two kinds of composite fibers (FLF + CBF and FLF + FBF) was comprehensively analyzed.
View Article and Find Full Text PDFInfluence of Basalt Fiber Morphology on the Properties of Asphalt Binders and Mixtures.
Materials (Basel)
November 2024
College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China.
Article Synopsis
- * Researchers used microscopy and various rheological and performance tests to evaluate how chopped basalt fiber (CBF) and flocculent basalt fiber (FBF) affect asphalt binders and mixtures.
- * The study found that both fiber types improve binder properties, but FBFs were particularly effective, showing higher resistance to deformation and providing better overall performance enhancements in asphalt mixtures compared to CBFs.
MVDR-LSTM Distance Estimation Model Based on Diagonal Double Rectangular Array.
Sensors (Basel)
May 2023
Hebei Key Laboratory of Electric Machinery Health Maintenance & Failure Prevention, North China Electric Power University, Baoding 071003, China.
Deep learning algorithms have the advantages of a powerful time series prediction ability and the real-time processing of massive samples of big data. Herein, a new roller fault distance estimation method is proposed to address the problems of the simple structure and long conveying distance of belt conveyors. In this method, a diagonal double rectangular microphone array is used as the acquisition device, minimum variance distortionless response (MVDR) and long short-term memory network (LSTM) are used as the processing models, and the roller fault distance data are classified to complete the estimation of the idler fault distance.
View Article and Find Full Text PDFCharacterization of forehead blood flow bias on NIRS signals during neural activation with a verbal fluency task.
Neurosci Res
January 2023
Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan; Akita International University, Yuwa, Akita 010-1292, Japan.
The major problem of near-infrared spectroscopy (NIRS) for brain activity measurement during verbal fluency task is the overlapping forehead scalp blood flow (FBF) on the target cerebral blood flow (CBF). There could be among-individual differences in the influence of FBF on CBF. We investigated effects of FBF on CBF by comparing signals obtained through a laser Doppler flowmeter (LDF) and NIRS using the modified Beer-Lambert Law (MBLL).
View Article and Find Full Text PDFHemodynamic Effect of Resuscitative Endovascular Balloon Occlusion of the Aorta in Hemodynamic Instability Secondary to Acute Cardiac Tamponade in a Porcine Model.
Shock
February 2022
Department of Cardiothoracic and Vascular Surgery, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
Background: The pre-hospital use of Resuscitative Endovascular Balloon Occlusion of the Aorta (REBOA) is increasing, although it remains controversial, in part because of suggested contraindications such as acute cardiac tamponade (ACT). As both the pre-hospital and in-hospital use of REBOA might potentially occur with concurrent ACT, knowledge of the hemodynamic effect of REBOA in this setting is crucial. This study, therefore, aimed at investigating the physiological effects of REBOA in hemodynamic instability secondary to ACT in a porcine model.
View Article and Find Full Text PDFWant 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!