scholarly journals Ricci–Yamabe maps for Riemannian flows and their volume variation and volume entropy

2019 ◽  
Vol 43 (5) ◽  
pp. 2631-2641
Author(s):  
Sinem GÜLER ◽  
Mircea CRASMAREANU2
Keyword(s):  
Volume Variation ◽  
Volume Entropy ◽  
Riemannian Flows

scholarly journals Echocardiographic measure of dynamic arterial elastance predict pressure response during norepinephrine weaning: an observational study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maxime Nguyen ◽  
Osama Abou-Arab ◽  
Stéphane Bar ◽  
Hervé Dupont ◽  
Bélaïd Bouhemad ◽  
...  
Keyword(s):  
Stroke Volume ◽  
Pulse Pressure ◽  
Pulse Pressure Variation ◽  
Stroke Volume Variation ◽  
Pressure Variation ◽  
Pressure Response ◽  
Arterial Elastance ◽  
Volume Variation ◽  
Norepinephrine Dose ◽  
Stroke Volume Variations

AbstractThe purpose of this study was to determine whether dynamic elastance EAdyn derived from echocardiographic measurements of stroke volume variations can predict the success of a one-step decrease of norepinephrine dose. In this prospective single-center study, 39 patients with vasoplegic syndrome treated with norepinephrine and for whom the attending physician had decided to decrease norepinephrine dose and monitored by thermodilution were analyzed. EAdyn is the ratio of pulse pressure variation to stroke volume variation and was calculated from echocardiography stroke volume variations and from transpulmonary thermodilution. Pulse pressure variation was obtained from invasive arterial monitoring. Responders were defined by a decrease in mean arterial pressure (MAP) > 10% following norepinephrine decrease. The median decrease in norepinephrine was of 0.04 [0.03–0.05] µg kg−1 min−1. Twelve patients (31%) were classified as pressure responders with a median decrease in MAP of 13% [12–15%]. EAdyn was lower in pressure responders (0.40 [0.24–0.57] vs 0.95 [0.77–1.09], p < 0.01). EAdyn was able to discriminate between pressure responders and non-responders with an area under the curve of 0.86 (CI95% [0.71 to1.0], p < 0.05). The optimal cut-off was 0.8. EAdyn calculated from the echocardiographic estimation of the stroke volume variation and the invasive arterial pulse pressure variation can be used to discriminate pressure response to norepinephrine weaning. Agreement between EAdyn calculated from echocardiography and thermodilution was poor. Echocardiographic EAdyn might be used at bedside to optimize hemodynamic treatment.

scholarly journals Evaluation of Stroke Volume Variation Obtained by the FloTrac™/Vigileo™ System to Guide Preoperative Fluid Therapy in Patients Undergoing Brain Surgery

2012 ◽  
Vol 40 (3) ◽  
pp. 1175-1181 ◽  
Author(s):  
J Li ◽  
Fh Ji ◽  
Jp Yang
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Stroke Volume ◽  
Stroke Volume Variation ◽  
Brain Surgery ◽  
Fluid Loading ◽  
Volume Loading ◽  
Fluid Infusion ◽  
Volume Variation ◽  
Ringer’S Lactate

OBJECTIVE: The accuracy of stroke volume variation (SVV) obtained by the FloTrac™/Vigileo™ system in otherwise healthy patients undergoing brain surgery was assessed. METHODS: Anaesthesia was induced in 48 patients with minimal fluid infusion. Before surgery, fluid volume loading was performed by infusion with Ringer's lactate solution in 200 ml steps over 3 min, repeated successively if the patient responded with an increase in stroke volume of ≥ 10%, until the increase was < 10% (nonresponsive). RESULTS: A total of 157 volume loading steps were performed in the 48 patients. Responsive and nonresponsive steps differed significantly in baseline values of blood pressure, heart rate and SVV. Significant correlations were found between the change in stroke volume after fluid loading and values of blood pressure, heart rate and SVV before fluid loading, with SVV the most sensitive variable. CONCLUSION: Stroke volume variation obtained using the FloTrac™/Vigileo™ system is a sensitive predictor of fluid responsiveness in healthy patients before brain surgery.

A Self‐Healing Volume Variation Three‐Dimensional Continuous Bulk Porous Bismuth for Ultrafast Sodium Storage

2021 ◽  
pp. 2011264
Author(s):  
Xiaolong Cheng ◽  
Ruiwen Shao ◽  
Dongjun Li ◽  
Hai Yang ◽  
Ying Wu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Self Healing ◽  
Volume Variation ◽  
Sodium Storage

The value of stroke volume variation in patients after cardiac surgery ventilated with low tidal volumes

2004 ◽  
Vol 21 (Supplement 32) ◽  
pp. 44-45
Author(s):  
S. Rex ◽  
S. Brose ◽  
S. Metzelder ◽  
R. Huenecke ◽  
G. Schaelte ◽  
...  
Keyword(s):  
Cardiac Surgery ◽  
Stroke Volume ◽  
Stroke Volume Variation ◽  
Volume Variation

Perioperative monitoring of fluid responsiveness after esophageal surgery using stroke volume variation

2008 ◽  
Vol 5 (3) ◽  
pp. 311-316 ◽  
Author(s):  
Makoto Kobayashi ◽  
Masayoshi Ko ◽  
Toshimoto Kimura ◽  
Eiji Meguro ◽  
Yoshiro Hayakawa ◽  
...  
Keyword(s):  
Stroke Volume ◽  
Fluid Responsiveness ◽  
Stroke Volume Variation ◽  
Esophageal Surgery ◽  
Volume Variation ◽  
Perioperative Monitoring
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