scholarly journals A comparison between left ventricular ejection time measurement methods during physiological changes induced by simulated microgravity

2021 ◽  
Author(s):  
Stefan Orter ◽  
Stefan Möstl ◽  
Martin Bachler ◽  
Fabian Hoffmann ◽  
Christopher C. Mayer ◽  
...  
Keyword(s):  
Simulated Microgravity ◽  
Left Ventricular ◽  
Time Measurement ◽  
Measurement Methods ◽  
Ventricular Ejection ◽  
Left Ventricular Ejection ◽  
Physiological Changes ◽  
Ejection Time ◽  
Left Ventricular Ejection Time ◽  
Ventricular Ejection Time

scholarly journals P.07 The Progression of Left Ventricular Ejection Time in Simulated Microgravity

2020 ◽  
Vol 26 (Supplement 1) ◽  
pp. S27
Author(s):  
Stefan Orter ◽  
Stefan Möstl ◽  
Martin Bachler ◽  
Fabian Hoffmann ◽  
Christopher C. Mayer ◽  
...  
Keyword(s):  
Simulated Microgravity ◽  
Left Ventricular ◽  
Ventricular Ejection ◽  
Left Ventricular Ejection ◽  
Ejection Time ◽  
Left Ventricular Ejection Time ◽  
Ventricular Ejection Time

scholarly journals Improvement of Left Ventricular Ejection Time Measurement in the Impedance Cardiography Combined with the Reflection Photoplethysmography

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3036 ◽  
Author(s):  
Shing-Hong Liu ◽  
Jia-Jung Wang ◽  
Chun-Hung Su ◽  
Da-Chuan Cheng
Keyword(s):  
Impedance Cardiography ◽  
Left Ventricular ◽  
Ventricular Ejection ◽  
Left Ventricular Ejection ◽  
Artificial Noise ◽  
Ejection Time ◽  
Left Ventricular Ejection Time ◽  
Noise Interference ◽  
Non Invasive ◽  
Ventricular Ejection Time

Cardiac stroke volume (SV) is an essential hemodynamic indicator that can be used to assess whether the pump function of the heart is normal. Non-invasive SV measurement is currently performed using the impedance cardiography (ICG). In this technology, left ventricular ejection time (LVET) is an important parameter which can be determined from the ICG signals. However, the ICG signals are inherently susceptible to artificial noise interference, which leads to an inaccurate LVET measurement and then yields an error in the calculation of SV. Therefore, the goal of the study was to measure LVETs using both the transmission and reflection photoplethysmography (PPG), and to assess whether the measured LVET was more accurate by the PPG signal than the ICG signal. The LVET measured by the phonocardiography (PCG) was used as the standard for comparing with those by the ICG and PPG. The study recruited ten subjects whose LVETs were simultaneously measured by the ICG using four electrodes, the reflection PPG using neck sensors (PPGneck) and the transmission PPG using finger sensors (PPGfinger). In each subject, ten LVETs were obtained from ten heartbeats selected properly from one-minute recording. The differences of the measured LVETs between the PCG and one of the ICG, PPGneck and PPGfinger were −68.2 ± 148.6 ms, 4.8 ± 86.5 ms and −7.0 ± 107.5 ms, respectively. As compared with the PCG, both the ICG and PPGfinger underestimated but the PPGneck overestimated the LVETs. Furthermore, the measured LVET by the PPGneck was the closest to that by the PCG. Therefore, the PPGneck may be employed to improve the LVET measurement in applying the ICG for continuous monitoring of SV in clinical settings.

Abstract 17298: Validation of Beat-to-Beat Blood Pressure and Left Ventricular Ejection Time by the Caretaker Physiological Monitor Against Invasive Central Aortic Measurement

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Evan Harmon ◽  
Younghoon Kwon ◽  
Patrick Stafford ◽  
Martin Baruch ◽  
Sung-Hoon Kim ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Unmet Need ◽  
Aortic Pressure ◽  
Left Ventricular ◽  
Ventricular Ejection ◽  
Left Ventricular Ejection ◽  
Ejection Time ◽  
Left Ventricular Ejection Time ◽  
Monitoring Technologies ◽  
Ventricular Ejection Time

Objective: There is an unmet need for noninvasive continuous blood pressure (BP) monitoring technologies in various clinical settings. We examined the accuracy of noninvasive Caretaker device against invasively measured central aortic BP. Methods: Beat-to-beat BP by Caretaker was recorded simultaneously with central aortic BP measured in patients undergoing cardiac catheterization. We derived correlations and Bland-Altman comparisons, after calibrating the Caretaker with 20 seconds of the initial catheter readings, as well as trend analyses for both systolic (SBP) and diastolic BP (DBP). We also measured left ventricular ejection time (LVET) from both aortic pressure tracing and Caretaker and compared the two. Results: A total of 47 patients were included in the study. A total of 31,369 beats obtained during the diagnostic portion of coronary angiogram were used for analysis. The correlations for SBP and DBP were 0.89 and 0.78, respectively (p < 0.001 for both). The Bland-Altman comparison yielded overall mean differences of 2.11 mmHg (SD 7.40) for SBP and 1.46 mmHg (SD 6.12) for DBP respectively (p <0.001 for all comparisons). The trend analysis yielded concordances of 86% and 85% for SBP and DBP, respectively. The correlation and Bland-Altman analyses for the LVET comparison yielded 0.89 (p< 0.001) with a mean difference of 13.9 ms (SD 14.4 ms). Conclusion: Beat-to-beat BP by Caretaker showed excellent agreement and high concordance in the direction and the degree of BP change with central aortic BP. This study supports the satisfactory performance of the Caretaker device in continuous tracking of beat-to-beat BP and LVET measurements.

Exercise-induced changes of left ventricular ejection time in noninvasive evaluation of chest pain

1986 ◽  
Vol 9 (6) ◽  
pp. 289-291
Author(s):  
M. Romano ◽  
M. Chiariello ◽  
G. Carella ◽  
T. DiMaro ◽  
M. R. Cotecchia ◽  
...  
Keyword(s):  
Chest Pain ◽  
Left Ventricular ◽  
Ventricular Ejection ◽  
Left Ventricular Ejection ◽  
Noninvasive Evaluation ◽  
Ejection Time ◽  
Left Ventricular Ejection Time ◽  
Exercise Induced ◽  
Ventricular Ejection Time ◽  
Induced Changes

Elucidation of physiologic lengthening of left ventricular ejection time during early upright exercise

1981 ◽  
Vol 101 (3) ◽  
pp. 309-313 ◽  
Author(s):  
Tetsuro Sugiura ◽  
Yoshinori L. Doi ◽  
Richard L. Bishop ◽  
Bruce G. Haffty ◽  
David H. Spodick
Keyword(s):  
Left Ventricular ◽  
Ventricular Ejection ◽  
Left Ventricular Ejection ◽  
Ejection Time ◽  
Left Ventricular Ejection Time ◽  
Ventricular Ejection Time
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