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Perfusion pressure CPB

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https://www.readbyqxmd.com/read/28622752/microvascular-fluid-exchange-during-cpb-with-deep-hypothermia-circulatory-arrest-or-low-flow
#1
Bjørg Elvevoll, Paul Husby, Venny L Kvalheim, Lodve Stangeland, Arve Mongstad, Øyvind S Svendsen
OBJECTIVE: Use of deep hypothermic low-flow (DHLF) cardiopulmonary bypass (CPB) has been associated with higher fluid loading than the use of deep hypothermia circulatory arrest (DHCA). We evaluated whether these perfusion strategies influenced fluid extravasation rates and edema generation differently per-operatively. MATERIALS AND METHODS: Twelve anesthetized pigs, randomly allocated to DHLF (n = 6) or DHCA (n = 6), underwent 2.5 hours CPB with cooling to 20°C for 30 minutes (min), followed by 30 min arrested circulation (DHCA) or 30 min low-flow circulation (DHLF) before 90 min rewarming to normothermia...
June 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28268793/blood-viscosity-monitoring-during-cardiopulmonary-bypass-based-on-pressure-flow-characteristics-of-a-newtonian-fluid
#2
Shigeyuki Okahara, Zu Soh, Shinya Takahashi, Taijiro Sueda, Toshio Tsuji
We proposed a blood viscosity estimation method based on pressure-flow characteristics of oxygenators used during cardiopulmonary bypass (CPB) in a previous study that showed the estimated viscosity to correlate well with the measured viscosity. However, the determination of the parameters included in the method required the use of blood, thereby leading to high cost of calibration. Therefore, in this study we propose a new method to monitor blood viscosity, which approximates the pressure-flow characteristics of blood considered as a non-Newtonian fluid with characteristics of a Newtonian fluid by using the parameters derived from glycerin solution to enable ease of acquisition...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226987/blood-viscosity-monitoring-during-cardiopulmonary-bypass-based-on-pressure-flow-characteristics-of-a-newtonian-fluid
#3
Shigeyuki Okahara, Zu Soh, Shinya Takahashi, Taijiro Sueda, Toshio Tsuji, Shigeyuki Okahara, Zu Soh, Shinya Takahashi, Taijiro Sueda, Toshio Tsuji, Zu Soh, Toshio Tsuji, Shinya Takahashi, Taijiro Sueda, Shigeyuki Okahara
We proposed a blood viscosity estimation method based on pressure-flow characteristics of oxygenators used during cardiopulmonary bypass (CPB) in a previous study that showed the estimated viscosity to correlate well with the measured viscosity. However, the determination of the parameters included in the method required the use of blood, thereby leading to high cost of calibration. Therefore, in this study we propose a new method to monitor blood viscosity, which approximates the pressure-flow characteristics of blood considered as a non-Newtonian fluid with characteristics of a Newtonian fluid by using the parameters derived from glycerin solution to enable ease of acquisition...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28100120/hybrid-stage-i-procedure-as-initial-palliation-for-neonate-with-hypoplastic-left-heart-syndrome-and-right-congenital-diaphragmatic-hernia
#4
Draginja Cvetkovic, Joseph Giamelli, Michael Lyew, Markus Erb, Suvro Sett, Youmna DiStefano
During the past decade, a hybrid procedure has emerged and dramatically evolved as an alternative stage I palliation to the conventional Norwood procedure in neonates with hypoplastic left heart syndrome (HLHS). The hybrid approach avoids the need for cardiopulmonary bypass (CPB) utilizing stenting of the arterial duct and bilateral pulmonary artery banding. Cerebral and coronary perfusion pressure is maintained, and the pulmonary vasculature is protected from higher systemic pressure. Elimination of risks associated with CPB gains vital time to stabilize the patient and correct coexisting noncardiac anomalies and allows growth in preparation for the later stages of the Fontan pathway...
January 1, 2017: Seminars in Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/27956671/defining-oliguria-during-cardiopulmonary-bypass-and-its-relationship-with-cardiac-surgery-associated-acute-kidney-injury
#5
D Hori, N M Katz, D M Fine, M Ono, V M Barodka, L C Lester, G Yenokyan, C W Hogue
BACKGROUND: While urine flow rate ≤0.5 ml kg(-1) h(-1) is believed to define oliguria during cardiopulmonary bypass (CPB), it is unclear whether this definition identifies risk for acute kidney injury (AKI) . The purpose of this retrospective study was to evaluate if urine flow rate during CPB is associated with AKI. METHODS: Urine flow rate was calculated in 503 patients during CPB. AKI in the first 48 h after surgery was defined by the Kidney Disease: Improving Global Outcomes classification...
December 2016: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/27782314/a-novel-blood-viscosity-estimation-method-based-on-pressure-flow-characteristics-of-an-oxygenator-during-cardiopulmonary-bypass
#6
Shigeyuki Okahara, Zu Soh, Satoshi Miyamoto, Hidenobu Takahashi, Hideshi Itoh, Shinya Takahashi, Taijiro Sueda, Toshio Tsuji
During cardiopulmonary bypass (CPB), blood viscosity conspicuously increases and decreases due to changes in hematocrit and blood temperature. Nevertheless, blood viscosity is typically not evaluated, because there is no technology that can provide simple, continuous, noncontact monitoring. We modeled the pressure-flow characteristics of an oxygenator in a previous study, and in that study we quantified the influence of viscosity on oxygenator function. The pressure-flow monitoring information in the oxygenator is derived from our model and enables the estimation of viscosity...
March 2017: Artificial Organs
https://www.readbyqxmd.com/read/27662668/continuous-blood-viscosity-monitoring-system-for-cardiopulmonary-bypass-applications
#7
Shigeyuki Okahara, Zu Soh, Satoshi Miyamoto, Hidenobu Takahashi, Shinya Takahashi, Taijiro Sueda, Toshio Tsuji
This paper proposes an algorithm that estimates blood viscosity during cardiopulmonary bypass (CPB) and validates its application in clinical cases. The proposed algorithm involves adjustable parameters based on the oxygenator and fluid types and estimates blood viscosity based on pressure-flow characteristics of the fluid perfusing through the oxygenator. This novel nonlinear model requires four parameters that were derived by in vitro experiments. The results estimated by the proposed method were then compared with a conventional linear model to demonstrate the former's optimal curve fitting...
July 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27651908/pulmonary-artery-perfusion-versus-no-pulmonary-perfusion-during-cardiopulmonary-bypass-in-patients-with-copd-a-randomised-clinical-trial
#8
Katrine B Buggeskov, Martin M Sundskard, Thomas Jonassen, Lars W Andersen, Niels H Secher, Hanne B Ravn, Daniel A Steinbrüchel, Janus C Jakobsen, Jørn Wetterslev
INTRODUCTION: Absence of pulmonary perfusion during cardiopulmonary bypass (CPB) may be associated with reduced postoperative oxygenation. Effects of active pulmonary artery perfusion were explored in patients with chronic obstructive pulmonary disease (COPD) undergoing cardiac surgery. METHODS: 90 patients were randomised to receive pulmonary artery perfusion during CPB with either oxygenated blood (n=30) or histidine-tryptophan-ketoglutarate (HTK) solution (n=29) compared with no pulmonary perfusion (n=31)...
2016: BMJ Open Respiratory Research
https://www.readbyqxmd.com/read/27271714/-reconstructive-surgery-of-aortic-arch-interruption-in-adults
#9
B N Kozlov, D S Panfilov, V V Saushkin, M S Kuznetsov, G G Nasrashvili, V M Shipulin
AIM: To evaluate surgical results in adults with aortic arch interruption. MATERIAL AND METHODS: Seven patients with aortic arch interruption were operated. Two of them (28.6%) underwent aortic arch repair using allograft, 4 (57.21%) - distal arch and proximal descending aortic replacement, 1 (14.3%) - supra-coronary ascending aortic, aortic arch and proximal descending aortic replacement. All operations were performed under moderate hypothermia (25 °С), circulatory arrest with unilateral cerabral perfusion 8-10 ml/kg/min via innominate artery and pressure 69...
2016: Khirurgiia
https://www.readbyqxmd.com/read/27174550/low-flow-lower-body-perfusion-for-spinal-protection-in-a-frozen-elephant-trunk-simulation-model
#10
Peter Lukas Haldenwang, Lorine Häuser, Nora Prochnow, Damian Ziebura, Andreas Baumann, Magdalena Sikole, Marcus Schlömicher, Inge Schmitz, Hildegard Christ, Justus Thomas Strauch
OBJECTIVES: The frozen elephant trunk (FET) procedure using isolated selective cerebral perfusion (SCP) at moderate hypothermia is associated with an increased risk for spinal cord ischaemia. The aim of this study was to evaluate the benefit of a combined selective cerebral and low-flow lower body perfusion (CLBP) in a porcine model. METHODS: Twenty pigs (46 ± 5 kg) were cooled on cardiopulmonary bypass (CPB) to 28°C. After aortic clamping and occlusion of the thoracic segmental arteries (TSAT4-T13), a pressure-controlled SCP (50 mmHg) was established for 90 min...
November 2016: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/27173069/vasopressin-as-therapy-during-nonocclusive-mesenteric-ischemia
#11
Hagen Bomberg, Heinrich V Groesdonk, Miriam Raffel, Peter Minko, Wolfram Schmied, Matthias Klingele, Hans-Joachim Schäfers
BACKGROUND: Vasopressin is used as an adjunct to norepinephrine to support blood pressure in vasodilatory shock after cardiopulmonary bypass (CPB). In this study, we report our observation of vasopressin treatment in 11 patients with nonocclusive mesenteric ischemia (NOMI). METHODS: In an observational cohort study, 78 patients were studied after having been treated for NOMI with intraarterial iloprost infusion after elective cardiac operation. All patients received norepinephrine as vasopressor for marked vasodilation...
September 2016: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/27139370/does-roller-pump-induced-pulsatile-cpb-perfusion-affect-microvascular-fluid-shifts-and-tissue-perfusion
#12
Bjørg Elvevoll, Steinar Lundemoen, Øyvind S Svendsen, Arve Mongstad, Ketil Grong, Venny L Kvalheim, Paul Husby
BACKGROUND: Pulsatile versus nonpulsatile cardiopulmonary bypass (CPB) perfusion remains debated. Beneficial effects on tissue perfusion, inflammation, and microvascular fluid exchange have been linked to pulsatile perfusion by some investigators and denied by others. This study evaluated fluid extravasation and tissue perfusion during nonpulsatile or pulsatile roller pump-induced CPB perfusion. METHODS: Fourteen pigs underwent roller pump-induced pulsatile (n = 7) or nonpulsatile CPB perfusion (n = 7) for 90 minutes...
August 2016: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/27095670/microcirculatory-changes-during-cardiac-surgery-with-cardiopulmonary-bypass
#13
I Prestes, J Riva, J P Bouchacourt, E Kohn, A López, F J Hurtado
OBJECTIVE: To evaluate microcirculation in intermediate and high mortality risk patients undergoing cardiac surgery (CS) with cardiopulmonary bypass (CPB). PATIENTS AND METHODS: The study included 22 patients with a Euroscore >3. Using the Videomicroscopy Side Stream Dark Field system, and evaluation was made of, capillary density, proportion of perfused capillaries, density of perfused capillaries, microcirculatory flow index (MFI), and heterogeneity flow index...
November 2016: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/27064896/cyanide-toxicity-during-cardiopulmonary-bypass-with-small-dose-of-nitroprusside-a-case-report
#14
Kum-Hee Chung, Seo Min Park, In Chan Baek, Junheum Jang, Yong-Woo Hong, SoWoon Ahn
Sodium nitroprusside (SNP) is an anti-hypertensive drug, commonly used to decrease the systemic vascular resistance and lower the blood pressure. When the amount of cyanide generated by the SNP exceeds the metabolic capacity for detoxification, cyanide toxicity occurs. Under general anesthesia and cardiopulmonary bypass (CPB), it may be difficult to detect the development of cyanide toxicity. In cardiac surgical patients, hemolysis, hypothermia and decreased organ perfusion, which emphasize the risk of cyanide toxicity, may develop as a consequence of CPB...
April 2016: Korean Journal of Anesthesiology
https://www.readbyqxmd.com/read/26765454/effects-of-hypothermic-cardiopulmonary-bypass-on-internal-jugular-bulb-venous-oxygen-saturation-cerebral-oxygen-saturation-and-bispectral-index-in-pediatric-patients-undergoing-cardiac-surgery-a-prospective-study
#15
COMPARATIVE STUDY
Zhiyong Hu, Lili Xu, Zhirui Zhu, Robert Seal, Patrick M McQuillan
The objective of this study was to evaluate the effect of hypothermic cardiopulmonary bypass (CPB) on cerebral oxygen saturation (rSO2), internal jugular bulb venous oxygen saturation (SjvO2), mixed venous oxygen saturation (SvO2), and bispectral index (BIS) used to monitor cerebral oxygen balance in pediatric patients.Sixty American Society of Anesthesiologists Class II-III patients aged 1 to 4 years old with congenital heart disease scheduled for elective cardiac surgery were included in this study. Temperature, BIS, rSO2, mean arterial pressure, central venous pressure, cerebral perfusion pressure (CPP), and hematocrit were recorded...
January 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/26763042/perioperative-optimal-blood-pressure-as-determined-by-ultrasound-tagged-near-infrared-spectroscopy-and-its-association-with-postoperative-acute-kidney-injury-in-cardiac-surgery-patients
#16
Daijiro Hori, Charles Hogue, Hideo Adachi, Laura Max, Joel Price, Christopher Sciortino, Kenton Zehr, John Conte, Duke Cameron, Kaushik Mandal
OBJECTIVES: Perioperative blood pressure management by targeting individualized optimal blood pressure, determined by cerebral blood flow autoregulation monitoring, may ensure sufficient renal perfusion. The purpose of this study was to evaluate changes in the optimal blood pressure for individual patients, determined during cardiopulmonary bypass (CPB) and during early postoperative period in intensive care unit (ICU). A secondary aim was to examine if excursions below optimal blood pressure in the ICU are associated with risk of cardiac surgery-associated acute kidney injury (CSA-AKI)...
April 2016: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/26466496/-examination-of-the-influence-of-age-and-cardiopulmonary-bypass-on-cerebral-autoregulation-in-pediatric-patients-for-the-cardiac-surgery-by-using-near-infrared-spectroscopy
#17
Koji Hoshino, Naoki Nishimoto, Yuji Morimoto
BACKGROUND: We evaluated the impact of age and cardiopulmonary bypass (CPB) on cerebral autoregulation in pediatric patients for the cardiac surgery with near-infrared spectroscopy. METHODS: This retrospective study was conducted with 67 children undergoing closure of atrial or ventricular septal defects with CPB. The regression coefficient ((see symbol)regional cerebral oxygenation index ((see symbol)SO2)/ mean arterial blood pressure (mABP)) for each patient was calculated by simple regression analysis, assuming that higher regression coefficients indicate less functional cerebral autoregulation...
September 2015: Masui. the Japanese Journal of Anesthesiology
https://www.readbyqxmd.com/read/26357797/a-2013-survey-on-pressure-monitoring-in-adult-cardiopulmonary-bypass-circuits-modes-and-applications
#18
Laura Rigg, Bruce Searles, Edward Morse Darling
Pressure data acquired from multiple sites of extracorporeal circuits can be an important parameter to monitor for the safe conduct of cardiopulmonary bypass (CPB). Although previous surveys demonstrate that CPB circuit pressure monitoring is widely used, there are very little data cataloging specific applications of this practice. Therefore, the purpose of this study is to survey the perfusion community to catalog 1) primary CPB circuit site pressure monitoring locations; 2) type of manometers used; 3) pressure monitoring interface and servoregulation with pump console; and 4) the rationale and documentation associated with pressure monitoring during CPB...
December 2014: Journal of Extra-corporeal Technology
https://www.readbyqxmd.com/read/26354746/versatile-minimized-system-a-step-towards-safe-perfusion
#19
Y M Ganushchak, E P J Körver, Y Yamamoto, P W Weerwind
A growing body of evidence indicates the superiority of minimized cardiopulmonary bypass (CPB) systems compared to conventional systems in terms of inflammatory reactions and transfusion requirements. Evident benefits of minimized CPB systems, however, do not come without consequences. Kinetic-assisted drainage, as used in these circuits, can result in severe fluctuations of venous line pressures and, consequently, fluctuation of the blood flow delivered to the patient. Furthermore, subatmospheric venous line pressures can cause gaseous microemboli...
May 2016: Perfusion
https://www.readbyqxmd.com/read/26334746/cerebral-autoregulation-monitoring-with-ultrasound-tagged-near-infrared-spectroscopy-in-cardiac-surgery-patients
#20
Daijiro Hori, Charles W Hogue, Ashish Shah, Charles Brown, Karin J Neufeld, John V Conte, Joel Price, Christopher Sciortino, Laura Max, Andrew Laflam, Hideo Adachi, Duke E Cameron, Kaushik Mandal
BACKGROUND: Individualizing mean arterial blood pressure (MAP) based on cerebral blood flow (CBF) autoregulation monitoring during cardiopulmonary bypass (CPB) holds promise as a strategy to optimize organ perfusion. The purpose of this study was to evaluate the accuracy of cerebral autoregulation monitoring using microcirculatory flow measured with innovative ultrasound-tagged near-infrared spectroscopy (UT-NIRS) noninvasive technology compared with transcranial Doppler (TCD). METHODS: Sixty-four patients undergoing CPB were monitored with TCD and UT-NIRS (CerOx™)...
November 2015: Anesthesia and Analgesia
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