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Bos Jasper - - 2013
During tissue retraction with a laparoscopic grasper, tissue-damaging pressures can occur. Past research suggests that peak pressures can be considerably reduced by rounding the edges or covering the tip of the end effector with a silicon sleeve. To identify grasping methods that limit tissue damage, the effects of (a) Young's ...
Li Li-Wei - - 2013
OBJECTIVE: This study investigated the influence of laparoscopic carbon dioxide (CO2) pneumoperitoneum on neonate circulation and respiration. METHODS: The study included neonates undergoing elective laparoscopic abdominal surgery. CO2 insufflation pressure was maintained within 8-14 mmHg for pneumoperitoneum creation. Heart rate (HR), mean arterial pressure (MAP), peripheral oxygen saturation (SpO2), partial pressure ...
Choi Seung Ho - - 2013
Purpose: We hypothesized that regional cerebral oxygen saturation (rSO2) could replace jugular bulb oxygen saturation (SjvO2) in the steep Trendelenburg position under pneumoperitoneum. Therefore, we evaluated the relationship between SjvO2 and rSO2 during laparoscopic surgery. Materials and Methods: After induction of anesthesia, mechanical ventilation was controlled to increase PaCO2 from ...
Broughton Duan D Ethicon Endo-surgery, Inc., Cincinnati, OH, - - 2013
Ultrasonic surgical devices have been demonstrated to provide excellent hemostasis, efficient transection, minimal lateral thermal damage, low smoke generation, and no risk of electrical current passage to the patient. These benefits originate from the inherent characteristics of the ultrasonic mechanism, but further improvements were thought possible through optimization of the ...
Fugazzi Russell W - - 2012
OBJECTIVE: To (1) evaluate biomechanical strength of 4 different laparoscopic knots using 2 suture types, and (2) evaluate carotid artery ligature bursting pressure of 2 knots using a single suture type. STUDY DESIGN: Biomechanical materials testing. SAMPLE POPULATION: Suture material (3-0 polydioxanone, 3-0 polyglactin 910). METHODS: Four knot types were ...
Wu Chueh-Yu - - 2012
Microfluidic technology plays an essential role in various lab on a chip devices due to its desired advantages. An automated microfluidic system integrated with actuators and sensors can further achieve better controllability. A number of microfluidic actuation schemes have been well developed. In contrast, most of the existing sensing methods ...
Dracopoulos Vassileios - - 2012
A LEO SUPRA 35VP FESEM has been modified to significantly improve image quality in the low pressure mode of operation. It is further shown that the same conversion can allow the machine to operate also as a fully fledged environmental scanning electron microscope with specimen chamber pressures in excess of ...
Rodrigues Paulo - - 2012
INTRODUCTION AND HYPOTHESIS: The aim of this study is to report a novel understanding of the urodynamic parameters used to diagnose iatrogenic female obstruction. There is no consensual definition of infravesical obstruction in women. Numerous criteria were designed with arbitrary cutoff values with poor clinical correlation. In order to determine ...
Abdala Ana P AP School of Physiology & Pharmacology, Bristol Heart Institute, Medical Science Building, University of Bristol, Bristol BS8 1TD, - - 2012
The peripheral chemoreflex is known to be enhanced in individuals with hypertension. In pre-hypertensive (PH) and adult spontaneously hypertensive rats (SHRs) carotid body type I (glomus) cells exhibit hypersensitivity to chemosensory stimuli and elevated sympathoexcitatory responses to peripheral chemoreceptor stimulation. Herein, we eliminated carotid body inputs in both PH-SHRs and ...
Chang Yun Hee - - 2012
A 28.7-month-old male child who had undergone a Norwood operation and bidirectional cavopulmonary shunt at the age of 5 days and 6.6 months, respectively, underwent the extracardiac conduit Fontan operation. After the operation, high-volume resuscitation was needed, which led to high central venous pressure (CVP) and low arterial oxygen saturation. ...
Tarafder Abhijit - - 2012
The pressure- and the density-drops along a chromatographic column eluted with supercritical fluid carbon dioxide were mapped as a function of the outlet column pressure and the temperature on the P-T diagram of neat CO(2). At low densities, the viscosity of CO(2) is low, which is expected to result into ...
Black Susan J - - 2012
INTRODUCTION: Application of cricoid pressure is a frequently used technique in both rapid sequence intubation in multiple settings and in a more controlled setting in the operating room. In a survey of emergency department personnel performed at the University of Michigan, it was found that there is a knowledge deficit ...
Toshner Mark - - 2012
Flow-directed pulmonary artery occlusion is posited to enable partitioning of vascular resistance into small and large vessels. As such it may have a role in assessment for pulmonary endarterectomy. To test if the occlusion technique distinguished small from large vessel disease we studied 59 subjects with chronic thromboembolic pulmonary hypertension ...
Roberts Howard W - - 2012
To evaluate if hydrostatic pulpal pressure plays a role in reducing microleakage. Uniform Class 5 preparations were accomplished on human molars with one margin on root dentin. Prepared teeth were randomly placed in one of three groups: (1) Hydrostatic pressure simulation at 20 cm pulpal pressure; (2) Hydrostatic pressure simulation ...
Lee S K - - 2011
Although melatonin lowers blood pressure in spontaneously hypertensive rats (SHR), its effect following antenatal and postpartum supplementation on the subsequent development of hypertension in SHR pups remains unknown. To investigate this, SHR dams were given melatonin in drinking water (10 mg/kg body weight/day) from day 1 of pregnancy until day 21 postpartum. After ...
Stern David L - - 2011
The Drosophila cuticle carries a rich array of morphological details. Thus, cuticle examination has had a central role in the history of genetics. Studies of the Drosophila cuticle have focused mainly on first-instar larvae and adult cuticular morphology. Although the cuticles of second- and third-instar larvae are strikingly different from ...
Skrablin S - - 2011
In this study, 205 nulliparous parturients were enrolled to receive either intermittent (nā€Š=ā€Š101) or continuous (nā€Š=ā€Š104) type of epidural analgesia in labour. The primary outcome was rate of caesarean deliveries, whereas secondary outcomes included rate of fundal pressure manoeuvres, duration of labour from application of analgesia, dose of anaesthetic and ...
Yang Xuejiao - - 2011
To investigate the effect of elevated hydrostatic pressure on the expression and distribution of zonula occludens-1 (ZO-1), and its effect on cytoskeleton and focal adhesion in immortal human trabecular meshwork cells (iHTM) and glaucomatous human trabecular meshwork cells (GTM(3)). iHTM and GTM(3) were exposed to 60 mmHg hydrostatic pressure for 6, ...
Bakker Rachel - - 2010
BackgroundCaffeine intake has been suggested to be associated with the risk of hypertension. Less is known about the associations of caffeine intake on maternal cardiovascular adaptations during pregnancy. We examined the associations of caffeine intake in different trimesters of pregnancy with repeatedly measured blood pressure and the risks of pregnancy-induced ...
Kirby Anna C - - 2011
The aim of this study was to determine whether preoperative voiding detrusor pressures were associated with postoperative outcomes after stress incontinence surgery. Opening detrusor pressure, detrusor pressure at maximum flow (p (det) Q(max)), and closing detrusor pressure were assessed from 280 valid preoperative urodynamic studies in subjects without advanced prolapse ...
Geerts Bart - - 2011
The authors evaluated the ability of 2 pulse contour cardiac output (CO) techniques to track CO changes during passive leg raising (PLR) to assess fluid loading responsiveness. A prospective study. An intensive care unit in a university hospital. Twenty mechanically ventilated postoperative cardiac surgery patients. Thirty-degree PLR. The authors estimated ...
Liu Jie J Dept. of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical Univ., Xi'an 710038, Shaanxi, - - 2011
Our aim was to investigate the effects of acute cold pressor test (CPT) on augmentation index (AI) and wave intensity (WI) indexes from right common carotid artery (RCCA) and right common femoral artery (RCFA) and to test whether the reflection coefficient (RC) from wave intensity analysis can reflect the distal ...
Baggio Maria Rita F - - 2011
We evaluated 16 pregnant women with gestational age between 20 and 32 weeks in acute severe hypertension which were randomly allocated to receive either hydralazine or labetalol. Blood pressure and Doppler ultrasound parameters from maternal uterine and fetal middle cerebral and umbilical arteries were assessed during acute severe hypertension and ...
Payne Rupert A - - 2010
Arterial generalized transfer functions (GTFs) are increasingly used to estimate central pressure from peripheral measurements. Analysis of derived central waveforms may be valuable in the assessment of patients with chronic kidney disease. The aim of this study was to assess whether the GTF is affected by renal disease. Ninety-four subjects ...
Shirai Kohji - - 2011
The cardio-ankle vascular stiffness index (CAVI) is a new parameter that reflects the stiffness of the aorta, femoral artery and tibial artery as a whole. One of its conspicuous features is that CAVI is independent of blood pressure at measuring time, theoretically. But, it has not been experimentally proved yet. ...
Safar Michel E - - 2010
There is no doubt as to the existence of a significant relationship between the pulsatile blood pressure component and cardiovascular risk. In hypertensive subjects, cardiovascular event risk reduction is mainly associated with the normalization of systolic blood pressure. Systolic blood pressure and pulse pressure in the ascending aorta exceeds brachial ...
Ait-Oufella Hafid - - 2010
Whether a direct blood pressure-independent reduction in aortic stiffness can occur after several years of antihypertensive treatment has never been unequivocally demonstrated. In this observational study, performed under conditions of routine clinical practice, we included 97 patients (age 63 ± 11 years) with treated essential hypertension who attended the outpatient ...
Maguire Sinead - - 2011
Dynamic variables are the best predictors of fluid responsiveness in patients under general anesthesia and mechanical ventilation; namely, respiratory variations in pulse pressure and in the plethysmographic waveform. However, these variables have potential limitations. Our aim was to evaluate their intraoperative applicability. We extracted clinical data from all anesthesia procedures ...
Ferro Charles J - - 2011
Chronic kidney disease is a proinflammatory state associated with increased arterial stiffness. We hypothesized that chronic kidney disease patients on long-term immunosuppression would have lower arterial stiffness and require treatment with less antihypertensive medication compared with non-immunosuppressed patients. A total of 254 patients (97 on immunosuppression) with chronic kidney disease ...
Tsioufis C - - 2011
The data regarding the role of serum uric acid (SUA) along with subclinical inflammation in the context of hypertensive vascular damage are rather scarce and controversial. Towards this end, we assess the links between SUA, high-sensitivity CRP (hs-CRP), adiponectin and carotid to femoral pulse wave velocity (c-f PWV) in 292 ...
Nürnberger Jens - - 2011
Despite the introduction of arterial stiffness measurements in the European recommendation, pulse wave velocity (PWV) and augmentation index (AI) are still not used routinely in clinical practice. It would be of advantage if such measurements were done in the sitting position as is done for blood pressure. The aim of ...
London Gerard M - - 2010
Arterial pressure is a cyclic phenomenon characterized by a pressure wave oscillating around the mean blood pressure, from diastolic to systolic blood pressure, defining the pulse pressure. Aortic input impedance is a measure of the opposition of the circulation to an oscillatory flow input (stroke volume generated by heart work). ...
Salvi Paolo - - 2010
Pulse wave velocity (PWV) and pulse pressure amplification (PPA) are independent predictors of cardiovascular risk, mainly in the elderly. The aim of the current research was to determine the influence of PPA and PWV, both manifestations of arterial stiffness, on heart disease in the elderly. The study population consisted of ...
Horváth Iván G - - 2010
The importance of measuring aortic pulse wave velocity (PWVao), aortic augmentation index (Aix) and central systolic blood pressure (SBPao) has been shown under different clinical conditions; however, information on these parameters is hard to obtain. The aim of this study was to evaluate the accuracy of a new, easily applicable ...
Hallal Pedro C - - 2010
The aim of this study was to describe resting pulse rate and associated factors among adolescents. This was a cross-sectional analysis nested in a prospective cohort study, including 4,452 adolescents born in Pelotas, Rio Grande do Sul State, Brazil in 1993, representing 87.5% of the original cohort. Pulse rate was ...
Prabhu Ramesh R Associate Professor, Department of Anaesthesiology, Kasturba Medical College, Manipal, - - 2010
It is known fact that pre-oxygenation with positive end-expiratory pressure (PEEP) improves the Partial pressure of oxygen (PO (2)). In this regard not many studies have been done in pregnant women to know its effect on foetus. In this randomised double blind controlled study, we analysed effect of pre-oxygenation with ...
Stergiou George S - - 2010
Arterial stiffness, assessed by carotid-femoral pulse wave velocity (PWV) or indirectly by pulse pressure (PP) or ambulatory arterial stiffness index (AASI), is an independent predictor of cardiovascular disease in adults. However, in children limited evidence is available. This study investigated the usefulness of AASI and PP as indices of arterial ...
Hashimoto Junichiro - - 2010
Aortic stiffness, peripheral wave reflection, and aorta-to-peripheral pulse pressure amplification all predict cardiovascular risk. However, the pathophysiological mechanism behind it is unknown. Tonometric pressure waveforms were recorded on the radial, carotid, and femoral arteries in 138 hypertensive patients (age: 56±13 years) to estimate aorta-to-peripheral amplifications, aortic augmentation index, and aortic ...
Mitchell Gary F - - 2010
Systolic blood pressure and pulse pressure are substantially higher in older adults. The relative contributions of increased forward versus reflected pressure wave amplitude or earlier arrival of the reflected wave to elevated pulse pressure remain controversial. We measured proximal aortic pressure and flow, forward pressure wave amplitude, global wave reflection, ...
Wu Hsien-Tsai - - 2010
Although contour analysis of pulse waves has been proposed as a non-invasive means in assessing arterial stiffness in atherosclerosis, accurate determination of the conventional parameters is usually precluded by distorted waveforms in the aged and atherosclerotic objects. We aimed at testing reliable indices in these patient populations. Digital volume pulse ...
Schillaci G - - 2010
Migraine has been associated with an increased risk for ischemic stroke and other cardiovascular (CV) events, including angina, myocardial infarction, and CV death, but the mechanisms that link migraine to CV disease remain uncertain. We hypothesized that aortic pulse wave velocity (PWV), a direct measure of aortic stiffness and an ...
Swamy Gokul - - 2010
We developed a technique to calculate forward and backward arterial waves from proximal and distal pressure waveforms. First, the relationship between the waveforms is represented with an arterial tube model. Then, the model parameters are estimated via least-squares fitting. Finally, the forward and backward waves are calculated using the parameter ...
Mufti Rania E - - 2010
This study examined whether elevated intravascular pressure stimulates asynchronous Ca(2+) waves in cerebral arterial smooth muscle cells and if their generation contributes to myogenic tone development. The endothelium was removed from rat cerebral arteries, which were then mounted in an arteriograph, pressurized (20-100 mmHg) and examined under a variety of ...
Redelinghuys Michelle - - 2010
Although central pulse pressure (PPc) is strongly related to central mean arterial pressure (MAPc), PPc predicts cardiovascular outcomes beyond MAPc. Whether modifiable risk factors for hypertension contribute to PPc and its determinants, independent of MAPc, is uncertain. In 635 randomly recruited participants, we assessed the independent relationship between 24-hour urinary ...
Oguanobi N I - - 2010
This study was aimed at comparing the arterial blood pressures in steady state adult sickle cell patients with those of age- and sex-matched healthy controls. A descriptive cross-sectional study of 62 sickle cell anemia patients and 62 age- and sex-matched healthy controls was carried out in the adult outpatient sickle ...
Martin Jeffrey S - - 2010
The main objectives of this study were to examine the acute effect of a single dose of smokeless tobacco (ST) on central aortic blood pressure and wave reflection characteristics. Fifteen apparently healthy male subjects (aged 30.6 ± 6.2 y) were given a 2.5 g oral dose of ST after baseline ...
Felderhof B U - - 2010
A mechanical model of pressure propulsion of a sphere in a viscous compressible fluid is studied on the basis of the linearized Navier-Stokes equations. It is assumed that chemical reactions in the neighborhood of the sphere cause pressure waves which push the sphere. A simple expression is derived for the ...
McEniery Carmel M CM Clinical Pharmacology Unit, University of Cambridge, Addenbrooke's Hospital, Box 110, Hills Rd, Cambridge CB2 0QQ, UK. - - 2010
Ageing exerts differential effects on arterial stiffness and wave reflections. However, the impact of cardiovascular risk factors on arterial stiffness and wave reflections and, particularly, how such effects are influenced by ageing has not been assessed within a single large population, covering a sufficiently wide age range. Therefore, we determined ...
Kenny Damien - - 2010
BACKGROUND: Increased arterial stiffness is linked to hypertension in adults after surgical repair for coarctation of the aorta. We evaluated the influence of surgical approaches, namely, subclavian flap repair (SFR) and end-to-end anastomosis (EEA), on arterial stiffness, blood pressure, cardiac output, and cardiac baroreceptor function in a cohort of young ...
Punj Jyotsna - - 2010
We present a case of ischemic changes after application of an adult pulse oximeter probe in an infant for a short period of only 10 min. To understand the physiology behind this mishap, we studied pressure exerted by the adult pulse oximeter probe on simulated fingers (fluid-filled pouches), which were ...
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