Tìm thấy 20+ kết quả cho từ khóa "Blood flow"
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Evaluation of radial and ulnar artery blood flow after radial artery decannulation using colour Doppler ultrasound. Background: There is a lack of reports in the literature regarding changes in radial artery blood flow after decan‑. The objective of this study was to investigate changes in radial and ulnar artery blood flow after radial artery decannulation using Doppler ultrasound and to explore the factors that influence radial artery blood flow recovery..
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The colored microsphere technique was used to meas- ure regional blood flow as described previously [12]. saline solution containing 0.02% Tween 80 were used for each blood flow measurement.
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Dose-response studies of Ropivacaine in blood flow of upper extremity after supraclavicular block: a double-blind randomized controlled study. Background: The sympathetic block of upper limb leading to increased blood flow has important clinical implication in microvascular surgery. However, little is known regarding the relationship between concentration of local anesthetic and blood flow of upper limb.
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It has been proved that peripheral blood flow velocity (such as carotid blood flow velocity) is quite relative to cardiac output (r = 0.8, P <. Measuring peripheral blood flow velocity is also easier than measuring stroke volume by transthoracic echocar- diography. Some previous studies have proved the value of peripheral ar- terial blood flow peak velocity (△Vpeak PA) to predict fluid responsiveness [6–13], but the study sample sizes were small, and the results were not always consistent..
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Blood flow mea- surements at the hepatic artery and portal vein were obtained using perivascular ultrasound transit time flow probes (TTFM, Medi-Stim AS, Oslo, Norway) [19]. size of the vessel (range 2–12 mm). Blood flow was expressed in ml min − 1 . PI quantifies pulsatility of a blood flow wave which represents vascu- lar resistance of the blood vessel downstream. The relative blood flow over the hepatic artery or portal vein was calculated by dividing arterial or portal HBF by CO..
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Numerical solution of the pulsatile, non-newtonian and turbulent blood flow in a patient specific elastic carotid artery. Hemodynamics of a stenosed aortic valve: effects of the geometry of the sinuses and the positions of the coronary ostia. Rationale and design of the heartflownxt (heartflow analysis of coronary blood flow using CT angiography: next steps) study. Strong scaling analysis of a parallel, unstructured, implicit solver and the influence of the operating system interference.
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Effects of temperature and haematocrit on the relationships between blood flow velocity and blood flow in a vessel of fixed diameter
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The methodological limitations are that trans- cranial Doppler does not measure cerebral blood flow, only changes of the blood flow velocities are propor- tional to cerebral blood flow values. And finally, in the present study we only tested CO 2 -reactivity toward hypocapnic direction.
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It is worth mentioning, however, that there was a tendency toward decreasing mean blood flow velocities.
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Based on those previous studies, cerebral blood flow increased temporarily when the posture was changed from the supine to the Trendelenburg position. Due to transient increase in cerebral blood flow, rSO 2 initially increased after the Trendelenburg position combined with CO 2 pneumoperitoneum.. Cerebral blood flow varies with PaCO 2 .
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Descending aorta blood flow (DA) which occupies almost 70% of CO could reflect the change in systemic blood flow. The velocity time integral (VTI) of L-R shunt, pulmonary artery (PA) and DA were measured respectively to represent blood flow assuming that the. M-line, color flow and spectral Doppler were used to measure the VTI of blood flow, assuring the angel between beam M-line and flow smaller than 20°.
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In a recent study, BPB was found to pro- vide higher blood flow to the radial artery and AVF compared to infiltration anesthesia [3] given the sym- patholytic effect, producing significant vasodilatation, decreased vascular resistance, [10] and increased local blood flow. This is consistent with other recent studies showing improvements in arterial blood flow and vaso- dilatation with RA. the overall mean AVF blood flow was 42.21 ml/min more in the BPB versus LA group.
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Stehr et al. [13], demonstrated that levosimendan signifi- cantly reversed the ropivacaine-induced reduction in cor- onary blood flow (in the Langendorff heart preparation/. These β-receptors work via cyclic ad- enosine phosphate (cAMP), but the effect of cAMP is lim- ited in the presence of local anesthetics. Thus, we propose that levosimendan is better at vasodilation of coronary ar- teries than epinephrine in the presence of bupivacaine..
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Renal blood flow. When renal blood flow is lowered, vasodilating PG are released that act to restore blood flow.. in the ther- apy of peptic ulcer (p. in that case their effects cannot be confined to the intended site of action.. 196 Antipyretic Analgesics. Antipyretic Analgesics 197. Antipyretic Analgesics.
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However, in a retrospective analysis in children younger than 6 months conducted by Rhondali et al., the authors com- pared data of two studies investigating the impact of sevo- flurane anesthesia on cerebral blood flow by transcranial. Even more Rhon- dali et al. 2 Time course of the median sevoflurane concentration (median ± interquartile range) calculated from patients in the group of combined general- and caudal anesthesia.
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J Cereb Blood Flow Metab 19:624–633. Hirschi KK, D’Amore PA (1996) Pericytes in the microvasculature. J Cereb Blood Flow Metab 17:534–542. J Cereb Blood Flow Metab 16:981–987. Huang Z, Huang PL, Panahian N, Dalkara T, Fishman MC, Moskowitz MA (1994) Effects of cerebral ischemia in mice deficient in neuronal nitric oxide synthase.
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Cerebral blood flow can be maintained if cardiac output and systemic arterial vasoconstriction compensate, but when these adjustments fail, hypotension with resultant cerebral underperfusion to less than half of normal results in syncope..
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Conclusions: Our data suggest an increased cerebral blood flow after early intraoperative administration of MgSO 4 in patients with SAH.
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Pulmonary blood flow is provided with a systemic to pulmonary artery shunt or a BCDPA.
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Prog ressive decrease in pulse and cardiac output;. decrease in carbon dioxide production per 8°C drop in temperature. increase in renal blood flow;. renal autoreg ulation intact;. L oss of cerebro vascula r autoreg ulation;. decline in cerebral blood flow;. Prog ressive decrease in blood. pressure, heart rate, and cardiac output. decrease in oxygen consumptio n. D ecrease in renal blood flow parallels decreas e in cardiac output;. progres sive decreas e in EEG. decreas e in basal metabol ism