scholarly journals Computational Analysis of Haemodynamic Indices in Synthetic Atherosclerotic Coronary Netwroks

2021 ◽  
Author(s):  
Sergey Simakov ◽  
Timur Gamilov ◽  
Philipp Kopylov ◽  
Fuyou Liang
Keyword(s):  
Heart Rate ◽  
Clinical Practice ◽  
Coronary Arteries ◽  
Coronary Stenosis ◽  
Computational Analysis ◽  
Geometric Models ◽  
Novel Approach ◽  
Ct Data ◽  
Elevated Heart Rate

Haemodynamic indices are widely used in clinical practice for deciding on a particular type of treatment. Low quality of the CT data and tachycardia complicate interpretation of the measured or simulated values. In this work, we present a novel approach for evaluating resistances in terminal coronary arteries. Using 14 measurements from 10 patients, we show that this algorithm retains the accuracy of 1D haemodynamic simulations in less detailed (truncated) geometric models of coronary networks. We also apply the variable systole fraction model to study the effect of elevated heart rate on the values of FFR, CFR and iFR. We conclude that tachycardia may produce both overestimation or underestimation of coronary stenosis significance.

scholarly journals Computational Analysis of Haemodynamic Indices in Synthetic Atherosclerotic Coronary Netwroks

Mathematics ◽  
2021 ◽  
Vol 9 (18) ◽  
pp. 2221
Author(s):  
Sergey Simakov ◽  
Timur Gamilov ◽  
Fuyou Liang ◽  
Philipp Kopylov
Keyword(s):  
Computed Tomography ◽  
Coronary Stenosis ◽  
Coronary Flow ◽  
Computational Analysis ◽  
Fractional Flow ◽  
Flow Reserve ◽  
Novel Approach ◽  
Tomography Data ◽  
Elevated Heart Rate

Haemodynamic indices are widely used in clinical practice when deciding on a particular type of treatment. Low quality of the computed tomography data and tachycardia complicate interpretation of the measured or simulated values. In this work, we present a novel approach for evaluating resistances in terminal coronary arteries. Using 14 measurements from 10 patients, we show that this algorithm retains the accuracy of 1D haemodynamic simulations in less detailed (truncated) geometric models of coronary networks. We also apply the variable systole fraction model to study the effect of elevated heart rate on the values of fractional flow reserve (FFR), coronary flow reserve (CFR) and instantaneous wave-free ratio (iFR). We conclude that tachycardia may produce both overestimation or underestimation of coronary stenosis significance.

Fractional Flow Reserve Estimation in Coronary Arteries by Forward Geometrical Modeling

2013 ◽  
Author(s):  
Jelle T. C. Schrauwen ◽  
Jolanda J. Wentzel ◽  
Anton F. W. van der Steen ◽  
Frank J. H. Gijsen
Keyword(s):  
Clinical Practice ◽  
Pressure Drop ◽  
Coronary Arteries ◽  
Fractional Flow Reserve ◽  
Coronary Stenosis ◽  
Fractional Flow ◽  
Reserve Estimation ◽  
Important Indicator ◽  
Flow Reserve ◽  
Pressure Wire

Fractional Flow Reserve (FFR) is an important indicator for the hemodynamic significance of a coronary stenosis [1]. The FFR is defined as the pressure drop over the stenosis under hyperemia. The pressure drop, and thus the FFR, depends on both the geometry and flow. In clinical practice, the FFR is measured with a pressure wire under administration of adenosine and intervention is warranted if the FFR is below 0.8.

scholarly journals Assessing the Quality of Heart Rate Variability Estimated from Wrist and Finger PPG: A Novel Approach Based on Cross-Mapping Method

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3156
Author(s):  
Mimma Nardelli ◽  
Nicola Vanello ◽  
Guenda Galperti ◽  
Alberto Greco ◽  
Enzo Pasquale Scilingo
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Statistical Tests ◽  
Mapping Method ◽  
Signal Quality ◽  
Pulse Rate Variability ◽  
Ecg Signals ◽  
Novel Approach ◽  
Field Sensor

The non-invasiveness of photoplethysmographic (PPG) acquisition systems, together with their cost-effectiveness and easiness of connection with IoT technologies, is opening up to the possibility of their widespread use. For this reason, the study of the reliability of PPG and pulse rate variability (PRV) signal quality has become of great scientific, technological, and commercial interest. In this field, sensor location has been demonstrated to play a crucial role. The goal of this study was to investigate PPG and PRV signal quality acquired from two body locations: finger and wrist. We simultaneously acquired the PPG and electrocardiographic (ECG) signals from sixteen healthy subjects (aged 28.5 ± 3.5, seven females) who followed an experimental protocol of affective stimulation through visual stimuli. Statistical tests demonstrated that PPG signals acquired from the wrist and the finger presented different signal quality indexes (kurtosis and Shannon entropy), with higher values for the wrist-PPG. Then we propose to apply the cross-mapping (CM) approach as a new method to quantify the PRV signal quality. We found that the performance achieved using the two sites was significantly different in all the experimental sessions (p < 0.01), and the PRV dynamics acquired from the finger were the most similar to heart rate variability (HRV) dynamics.

scholarly journals The possibilities of usage of ivabradin (Coraxan) in elderly and senile patients with the syndrome of polymorbidity

2013 ◽  
Vol 4 (4) ◽  
pp. 33-36
Author(s):  
A. N Ilnitskij ◽  
K. I Proshchaev ◽  
L. V Priadko
Keyword(s):  
Quality Of Life ◽  
Heart Rate ◽  
Clinical Practice ◽  
The Face

The article presents the results of own researches, according to which the syndrome of polymorbidity in people of elderly and senile age in the face of contraindications to use of b-adrenoblockers, may be an alternative to the appointment of the drug ivabradin (Coraxan). He contributes to a significant decrease of the heart rate, improve anginose status and quality of life. In terms of prospects of the further introduction of the drug into clinical practice seems advisable to identify his protective neuroimmunoendocrine effects, which, probably, will allow to expand the indications to its application.

Heart Rate Recovery Changes during Competition Period in High-Level Basketball Players

2018 ◽  
Vol 1 (80) ◽  
Author(s):  
Audrius Gocentas ◽  
Anatoli Landõr ◽  
Aleksandras Kriščiūnas
Keyword(s):  
Heart Rate ◽  
Heart Rate Recovery ◽  
Team Sports ◽  
Basketball Players ◽  
Coeffi Cients ◽  
Competition Period ◽  
Monitoring Training ◽  
Intense Training ◽  
High Level

Research background and hypothesis. Replete schedule of competitions and intense training are features of contemporary team sports. Athletes, especially the most involved ones, may not have enough time to recover. As a consequence, aggregated fatigue can manifest in some undesirable form and affect athlete’s performance and health.Research aim. The aim of this study was to evaluate the changes in heart rate recovery (HRR) and investigate possible relations with sport-specifi c measures of effi cacy in professional basketball players during competition season.Research methods. Eight male high-level basketball players (mean ± SD, body mass, 97.3 ± 11.33 kg; height 2.02 ± 0.067 m, and age 23 ± 3.12 years) were investigated. The same basketball specifi c exercise was replicated several times from September till April during the practice sessions in order to assess the personal trends of HRR. Heart rate monitoring was performed using POLAR TEAM SYSTEM. Investigated athletes were ranked retrospectively according to the total amount of minutes played and the coeffi cients of effi cacy. Research results. There were signifi cant differences in the trends of HRR between the investigated players. The most effective players showed decreasing trends of HRR in all cases of ranking.Discussion and conclusions. Research fi ndings have shown that the quality of heart rate recovery differs between basketball players of the same team and could be associated with sport-specifi c effi cacy and competition playing time.Keywords: adaptation, autonomic control, monitoring training.

METHODOLOGICAL ASPECTS OF VISUALIZATION OF CORONARY ARTERIES WITH TRANSTHORACIC ECHOCARDIOGRAPHY

2018 ◽  
pp. 26-35
Author(s):  
Z. A. Agaeva ◽  
K. B. Baghdasaryan
Keyword(s):  
Blood Flow ◽  
Coronary Blood Flow ◽  
Coronary Arteries ◽  
Transthoracic Echocardiography ◽  
Second Harmonic ◽  
Anatomic Reconstruction ◽  
High Quality ◽  
Acoustic Window ◽  
Methodological Aspects

The transthoracic echocardiography made by multifrequency probes with support of the mode of the second harmonic imaging, is a competitive method for visualization of the main coronary arteries and allows to estimate coronary blood flow with high quality. Of course, the method has considerable restrictions, most important of which is the low spatial resolution of a method, due to small acoustic window. Because of this the transthoracic visualization of coronary arteries perhaps will not become the leading method of anatomic reconstruction of separately taken coronary artery and especially all coronary arteries system. However uniqueness and indisputable advantage of this method is an opportunity to noninvasively estimate a coronary blood flow both once, and in dynamics.

Nurses’ Perceptions of a Care Plan Information Technology Solution With Hundreds of Clinical Practice Guidelines in Adult Intensive Care Units: Survey Study (Preprint)

2018 ◽  
Author(s):  
Azizeh Khaled Sowan ◽  
Meghan Leibas ◽  
Albert Tarriela ◽  
Charles Reed
Keyword(s):  
Intensive Care ◽  
Quality Of Care ◽  
Clinical Practice ◽  
Nursing Care ◽  
Clinical Practice Guidelines ◽  
Practice Guidelines ◽  
Care Plan ◽  
System Use ◽  
Nurses Perceptions

BACKGROUND The integration of clinical practice guidelines (CPGs) into the nursing care plan and documentation systems aims to translate evidence into practice, improve safety and quality of care, and standardize care processes. OBJECTIVE This study aimed to evaluate nurses’ perceptions of the usability of a nursing care plan solution that includes 234 CPGs. METHODS A total of 100 nurses from 4 adult intensive care units (ICUs) responded to a survey measuring nurses’ perceptions of system usability. The survey included 37 rated items and 3 open-ended questions. RESULTS Nurses’ perceptions were favorable with more than 60.0% (60/100) in agreement on 12 features of the system and negative to moderate with 20.0% (20/100), to 59.0% (59/100) in agreement on 19 features. The majority of the nurses (80/100, 80.0% to 90/100, 90.0%) agreed on 4 missing safety features within the system. More than half of the nurses believed they would benefit from refresher classes on system use. Overall satisfaction with the system was just above average (54/100, 54.0%). Common positive themes from the narrative data were related to the system serving as a reminder for complete documentation and individualizing patient care. Common negative aspects were related to duplicate charting, difficulty locating CPGs, missing unit-specific CPGs, irrelevancy of information, and lack of perceived system value on patient outcomes. No relationship was found between years of system use or ICU experience and satisfaction with the system (P=.10 to P=.25). CONCLUSIONS Care plan systems in ICUs should be easy to navigate; support efficient documentation; present relevant, unit-specific, and easy-to-find information; endorse interdisciplinary communication; and improve safety and quality of care.

scholarly journals Evaluating the success of the tele-pathology system in governmental hospitals in Kuwait: an explanatory sequential mixed methods design

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Ali Jasem Buabbas ◽  
Tareq Mohammad ◽  
Adel K. Ayed ◽  
Hawraa Mallah ◽  
Hamza Al-Shawaf ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Mixed Methods ◽  
Support Services ◽  
User Satisfaction ◽  
Technical Support ◽  
Successful Implementation ◽  
System Quality ◽  
Mixed Methods Design ◽  
Telepathology System

Abstract Background Telepathology is the practice of reviewing and exchanging pathological images through telecommunication systems to obtain diagnoses remotely. Studying the factors that make such a system successful and favourable is important to ensure the merits of its implementation in clinical practice. Objective This study aims to evaluate the success of a telepathology system from the users’ perspectives, using specific evaluation criteria, namely: system quality, information quality, technical service quality, user satisfaction, and benefits. Methods A sequential explanatory mixed methods design was adopted in this study, which consists of two phases. Initially, a questionnaire was distributed via WhatsApp to all of the pathologists (total: 45) working at governmental hospitals in Kuwait. Followed by, semi-structured interviews with ten senior pathologists. Results Forty pathologists responded to the questionnaire, giving an 89% response rate. There were 42.5% of the respondents aged between 35–44 years old, and 52.5% were male. The quantitative results reveal that most of the respondents were satisfied with the quality of the telepathology system with a mean of 2.6025 (Standard Deviation (SD) = 0.47176), whereas they were dissatisfied with the quality of the information with a mean of 2.4100 (SD = 1.580) and the technical support services with a mean of 2.2750 (SD = 0.99535). In addition, there was disagreement on the benefits of telepathology in clinical practice among the pathologists with a mean of 2.4667 (SD = 0.77552). The qualitative results indicate that the lack of interest in and little experience with using the system were behind the general dissatisfaction of most of the respondents. All of the interviewees were satisfied with the performance of the telepathology system and considered it successful; however, the quality of the technical support services, including training workshops, was deemed deficient. Conclusion This study concluded that telepathology system in Kuwait is functioning well and has been successful in its implementation; however, pathologists are dissatisfied with it, mainly due to the deficient quality of the technical support services provided. In addition, the successful implementation of such advanced technologies requires careful steps to be taken on multiple levels: technical, organisational, and managerial. Recommendations were suggested.

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