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Takagi H H Department of Cardiovascular Surgery, Shizuoka Medical Center, Shizuoka, Japan - - - 2014
To determine whether weather factors including atmospheric pressure are associated with the occurrence of ruptured abdominal aortic aneurysm (RAAA), we investigated our institutional experiences of RAAA in more than 150 patients during 8 years. Further, we performed a meta--analysis of published studies reporting the influence of atmospheric pressure on RAAA. ...
Caielli Paola P Department of Medicine-DIMED, Internal Medicine 4, University of Padua, Padua, - - 2014
Atherosclerotic renal artery stenosis can cause ischaemic nephropathy and arterial hypertension. We herein review the observational and randomized clinical trials (RCTs) comparing medical and endovascular treatment for control of hypertension and renal function preservation. Using the Population Intervention Comparison Outcome (PICO) strategy, we identified the relevant studies and performed a ...
Lindgren Antti E AE Neurosurgery of NeuroCenter, Kuopio University Hospital , Kuopio , - - 2014
Objective. Hypertension associates with subarachnoid hemorrhage from saccular intracranial aneurysm (sIA-SAH) when compared to matched controls or general population. Few series compare hypertension in unruptured sIA versus sIA-SAH, so its impact on the sIA disease remains uncertain. Methods. Kuopio sIA Database ( www.uef.fi/ns ) contains all cases of unruptured and ...
Perry Blake G BG School of Sport and Exercise, Massey University, Palmerston North, New - - 2014
The Valsalva maneuver (VM) produces large and abrupt increases in mean arterial pressure (MAP) at the onset of strain (Phase I), however, hypotension, sufficient to induce syncope, occurs upon VM release (phase III). We examined the effect of VM intensity and duration on middle cerebral artery blood velocity (MCAv) responses. ...
Robert Nicolas N Department of Surgery, Saint Antoine Hospital, Pierre et Marie Curie University, Paris, France. Electronic address: - - 2014
Meteorologic conditions have a significant impact on the occurrence of cardiovascular events. Previous studies have shown that abdominal aortic aneurysm rupture (AAAR) may be associated with atmospheric pressure, with conflicting results. Therefore, we aimed to further investigate the nature of the correlation between atmospheric pressure variations and AAAR. Hospital admissions ...
Antón R R a Department of Mechanical Engineering , Tecnun-University of Navarra , Paseo de Manuel Lardizábal 13, San Sebastián Gipuzkoa 20018 , - - 2014
The objective of the present manuscript is three-fold: (i) to study the detailed pressure field inside a patient-specific abdominal aortic aneurysm (AAA) model experimentally and numerically and discuss its clinical relevance, (ii) to validate a number of possible numerical model options and their ability to predict the experimental pressure field ...
Holsgrove D T DT Department of Neurosurgery, Salford Royal Hospital, Manchester, M6 8HD, UK, - - 2014
Intracranial hypertension can occur following aneurysmal subarachnoid haemorrhage (SAH). It can be treated with decompressive craniectomy (DC) with the aim of reducing intracranial pressure, increasing cerebral perfusion and reducing further morbidity and mortality. We studied the outcome of patients undergoing DC following SAH at our institution, to ascertain whether the ...
Murki Srinivas S Department of Neonatology, Fernandez Hospital, Hyderabad, Andhra Pradesh, - - 2014
Case 1: A term male child was re-admitted on day 10 of life due to acute onset of respiratory distress. Physical examination revealed tachypnoea, tachycardia and blood pressure (BP) above the 95th centile in all four limbs. Cardiovascular examination revealed a short systolic murmur on the sternal border. Abdomen showed ...
Kózka Mateusz Andrzej MA Department of Medicine, Jagiellonian University Medical College, Krakow, - - 2013
Several studies have documented that weather factors, seasons of the year, time of the day, and even changes in moon phases have an impact on the occurrence of rupture of an abdominal aortic aneurysm (RAAA); however, the available data are confounding. The objective of this study was to determine the impact ...
Macdonald R Loch - - 2013
Subarachnoid haemorrhage (SAH) causes early brain injury (EBI) that is mediated by effects of transient cerebral ischaemia during bleeding plus effects of the subarachnoid blood. Secondary effects of SAH include increased intracranial pressure, destruction of brain tissue by intracerebral haemorrhage, brain shift, and herniation, all of which contribute to pathology. ...
Magalhaes Marina Gabriella Pereira de Andrada MG Universidade de Pernambuco, Recife, PE, - - 2013
To review the literature on studies that estimated the prevalence of high blood pressure (HBP) or systemic arterial hypertension (SAH) in Brazilian adolescents, considering the employed methodological procedures. Bibliographical research of prevalence studies of HBP/SAH in adolescents from 1995 to 2010. The search was conducted in the electronic databases PubMed/Medline, ...
Igase Michiya - - 2013
Background: Although rupture of unruptured intracranial aneurysms (UIAs) is closely associated with UIA growth during follow-up, few studies have investigated how UIAs grow during observation. Hypertension appears to affect the formation of intracranial aneurysms. However, few studies have investigated the association of blood pressure variability with UIA growth. Visit-to-visit variability ...
Berger M - - 2013
Abstract Objective: Neurosurgery often requires skull immobilization with a Mayfield clamp, which often causes brief intense nociceptive stimulation, hypertension and tachycardia. Blunting this response may help prevent increased intracranial pressure, cerebral aneurysm or vascular malformation rupture, and/or myocardial stress. While various interventions have been described to blunt this response, no ...
Varelas Panayiotis N - - 2013
Abstract Purpose: Clevidipine is a novel, ultra-short acting dihydropyridine. We hypothesized that clevidipine would rapidly control elevated blood pressure (BP) in patients with aneurysmal subarachnoid hemorrhage (SAH). Materials and Methods: This prospective open-label pilot study evaluated the efficacy and safety of clevidipine in reducing blood pressure (BP) to a pre-specified ...
Qureshi Adnan I - - 2013
Atherosclerotic disease often involves the intracranial arteries including those encased by cranial bones and dura, and those located in the subarachnoid space. Age, hypertension, and diabetes mellitus are independent risk factors for intracranial atherosclerosis. Intracranial atherosclerosis can result in thromboembolism with or without hypoperfusion leading to transient or permanent cerebral ...
Ciszek Bogdan - - 2013
Intracranial bleeding is linked to hemodynamic stress factors, such as hypertension. However, there are no studies that tested the breaking pressure of normal large cerebral arteries in humans. The brains of 10 cadavers (age, 47±14 years; 9 men) were harvested within 48 hours postmortem for 31 segments of the main ...
Schuld Jochen - - 2013
Objective: To examine the influence of local meteorological conditions on the onset of ruptured abdominal aortic aneurysms (AAA). Methods: A review of 6551 consecutive days with a total of 191 ruptured AAA was performed between January, 1994 and December, 2011. Days with and without ruptured AAA were compared considering local ...
Tuan Pham Minh - - 2013
Type I endoleaks are one of the most frequent and life-threatening complications of thoracic endovascular aortic repair. This study aimed to assess the use of suture-anchoring devices for repairing type I endoleaks. The descending aortic aneurysm model (saccular type) was made by side-to-end anastomosis to a Dacron graft. A Matsui-Kitamura ...
Schiefecker Alois J - - 2013
INTRODUCTION: Diclofenac, a nonsteroidal anti-inflammatory drug, is commonly used as antipyretic therapy in intensive care. The purpose of this study was to investigate the effects of parenteral diclofenac infusion on brain homeostasis including brain tissue oxygen tension (PbtO2) and brain metabolism after aneurismal subarachnoid hemorrhage (aSAH). METHODS: We conducted a ...
Schuurman T - - 2013
The application of laser measurements in medical applications makes it possible to measure even very small vibrations without contacting the skin surface. In the present work we investigate the use of a scanning vibrometer to measure the mechanical wave of the abdominal wall caused by the heart beat and blood ...
Steinman David A - - 2013
Stimulated by a recent controversy regarding pressure drops predicted in a giant aneurysm with a proximal stenosis, the present study sought to assess variability in the prediction of pressures and flow by a wide variety of research groups. In phase I, lumen geometry, flow rates, and fluid properties were specified, ...
Molacek Jiri - - 2013
PURPOSE: There is much interest in all factors that influence the etiopathogenesis of abdominal aortic aneurysm (AAA) rupture. Apart from the well-established factors such as arterial hypertension, smoking, age, and genetic predisposition, less common factors that may play a role in the mechanism of the rupture are the subject of ...
Chitnis Parag V - - 2013
This two-part study investigated shell rupture of ultrasound contrast agents (UCAs) under static overpressure conditions and the subharmonic component from UCAs subjected to 20-MHz tonebursts. Five different polylactide-shelled UCAs with shell-thickness-to-radius ratios (STRRs) of 7.5, 30, 40, 65, and 100 nm/¿m were subjected to static overpressure in a glycerol-filled test ...
Plesnila Nikolaus - - 2013
Subarachnoid hemorrhage (SAH) is the subtype of stroke with one of the highest mortality rates and the least well-understood pathophysiologies. One of the very early events which may occur after SAH is a significant decrease of cerebral perfusion pressure (CPP) caused by the excessive increase of intracranial pressure during the ...
Mak Calvin Hoi Kwan - - 2013
Intracranial hypertension is commonly encountered in poor-grade aneurysmal subarachnoid hemorrhage patients. Refractory raised intracranial pressure is associated with poor prognosis. The management of raised intracranial pressure is commonly referenced to experiences in traumatic brain injury. However, pathophysiologically, aneurysmal subarachnoid hemorrhage is different from traumatic brain injury. Currently, there is a ...
Schüller Kathrin - - 2013
In this video publication a standardized mouse model of subarachnoid hemorrhage (SAH) is presented. Bleeding is induced by endovascular Circle of Willis perforation (CWp) and proven by intracranial pressure (ICP) monitoring. Thereby a homogenous blood distribution in subarachnoid spaces surrounding the arterial circulation and cerebellar fissures is achieved. Animal physiology ...
Kordzadeh Ali A Mid Essex Hospitals Services NHS Trust, Department of Vascular Surgery, Broomfield Hospital, Essex CM1 7ET, UK. - - 2013
There have been various suggestions that abdominal aortic aneurysm rupture (rAAA) might have a seasonal variation depending on atmospheric pressure (AP) alteration. Despite above suggestions no study has yet examined the effect of fluctuation in AP on daily, seasonal, monthly, AAA size and co-morbidities to reach a conclusive outcome. A ...
Bunte Matthew C - - 2012
The treatment of resistant hypertension has undergone remarkable advancements in recent years. Endovascular radio frequency renal sympathetic denervation (RSD) has shown initial success in treating resistant hypertension by targeting the connection between the brain and renal sympathetic nerves. However, the encouraging results of first-generation RSD have been tempered by important ...
Morris Liam - - 2012
The long-term success of the endovascular procedure for the treatment of Abdominal Aortic Aneurysms (AAAs ) depends on the secure fixation of the proximal end and the geometry of the stent-graft (SG) device. Variations in SG types can affect proximal fixation and SG hemodynamics. Such hemodynamic variations can have a ...
Tercero C C Global Center of Excellence for Education and Research of Micro-Nano Mechatronics, Department of Micro-Nano Systems Engineering, Nagoya University, Japan. - - 2012
In the domain of endovascular neurosurgery, the measurement of tissue integrity is needed for simulator-based training and for the development of new intravascular instruments and treatment techniques. In vitro evaluation of tissue manipulation can be achieved using photoelastic stress analysis and vasculature modeling with photoelastic materials. In this research we ...
Bartlett Christina S CS Department of Pharmacology, Vanderbilt University Medical Center, 1161 21 Ave, Medical Center North # B3214, Nashville, TN 37232-2372, - - 2012
Prostaglandin E(2) is a major prostanoid found in the kidney and vasculature contributing to the regulation of blood pressure. The prostaglandin E(2) receptor EP1 has been shown to contribute to hypertension by mediating angiotensin II-dependent vasoconstriction, although its precise role is incompletely characterized. Disruption of the EP1 receptor in C57BL/6J ...
Barry Christine M - - 2012
Mortality following subarachnoid haemorrhage (SAH) is high, especially within the first 48h. Poor outcome is predicted by high intracranial pressure which causes diminished cerebral perfusion pressure unless a compensatory increase in mean arterial blood pressure occurs. Therefore blood pressure elevation can be protective following subarachnoid haemorrhage despite the potential for ...
Kono Kenichi - - 2012
BACKGROUND AND IMPORTANCE:: Hemodynamics play an important role in the mechanisms of aneurysm formation, growth, and rupture. However, little is known regarding hemodynamics of rupture sites. CLINICAL PRESENTATION:: We incidentally acquired three-dimensional images before and at the moment of rebleeding of a cerebral aneurysm in a patient. Comparison of these ...
Andreatta Pamela - - 2012
Introduction: Bimanual uterine compression may provide a reasonable treatment option for controlling or arresting postpartum hemorrhage in areas where access to care and advanced medical interventions are limited. Preliminary evidence suggests that correctly performed bimanual uterine compression is unsustainable for more than a few minutes, despite empirical evidence and practice ...
Colbert Serryth D - - 2012
With the 2012 Olympics being held in London, we explored pre-requisites for success in sport, and the comparative efficacy of employing these when performing under intense pressure in the clinical setting. We asked members of the Great Britain Olympic rowing team and OMFS surgeons to complete a validated questionnaire on ...
Gardner Heidi K - - 2012
All teams would like to think they do their best work when the stakes are highest-when the company's future or their own rests on the outcome of their projects. But too often something else happens. In extensive studies of teams at professional service firms, Harvard Business School's Gardner has seen ...
Goodlad Cate - - 2012
A young man presented with severe hypertension with evidence of both neurological and cardiovascular end-organ damage. Investigation revealed a small right kidney and a left renal artery aneurysm. Significant hypertension persisted even after right nephrectomy. Despite extensive investigation, no evidence was found to implicate the aneurysm in the causation of ...
Yuksel Simge - - 2012
Subarachnoid hemorrhage (SAH) due to intracranial aneurysm rupture is a complex clinical disease with high mortality and morbidity. Recent studies suggest that early brain injury (EBI) rather than vasospasm might be responsible for morbidity and mortality within 24-72 hours after SAH. The rise in intracranial pressure following SAH causes a ...
Schmidt Eric A - - 2012
Patients with good-grade subarachnoid hemorrhage (SAH) are those without initial neurological deficit. However, they can die or present severe deficit due to secondary insult leading to brain ischemia. After SAH, in a known context of energy crisis, vasospasm, hydrocephalus and intracranial hypertension contribute to unfavorable outcome. Lumbar puncture (LP) is ...
Polzer Stanislav - - 2012
The predictions of stress fields in Abdominal Aortic Aneurysm (AAA) depend on constitutive descriptions of the aneurysm wall and the Intra-luminal Thrombus (ILT). ILT is a porous diluted structure (biphasic solid-fluid material) and its impact on AAA biomechanics is controversially discussed in the literature. Specifically, pressure measurements showed that the ...
Jordet Geir - - 2012
This study examined the links between historical team results and individual players' subsequent performances in a high-pressure real-world sport situation. Videos were obtained from all soccer penalty shootouts held in two major international tournaments (World Cup and European Championships) between 1976 and 2006 (n= 260 players/309 kicks), and we controlled ...
Friese K - - 2011
The crystal structure of ammonium rubidium nonaoxotetratellurate(IV) dihydrate has been studied as a function of pressure up to 7.40 GPa. The ambient-pressure structure is characterized by the co-existence of three different Te-O polyhedra (TeO(3), TeO(4) and TeO(5)), which are connected to form layers. NH(4)(+), H(2)O and Rb(+) are incorporated between the ...
Fanning Jeffrey J - - 2011
: Few pediatric studies exist regarding the use of noninvasive positive-pressure ventilation for acute respiratory failure; however, those that do suggest a role. This study seeks to describe attitudes and perceived practices of pediatric intensivists regarding the use of noninvasive positive-pressure ventilation in children with acute respiratory failure. : Electronic ...
Custer Jason W - - 2011
: The Sensormedics 3100A and 3100B are widely used to provide high-frequency oscillatory ventilation in clinical practice. Infants and children <35 kg are typically oscillated with the 3100A and >35 kg with the 3100B. This study compares the effect of ventilator and patient parameters on delivered tidal volume during high-frequency ...
Tourtier Jean-Pierre - - 2011
Exacerbation of asthma can be seen during air transport. Severe patients, not responding to conventional therapy, require ventilator support. We evaluated the performance of two transport ventilators, built with turbine technology, the T-birdVSO2 and the LTV-1000, for use during aeromedical evacuation of acute severe asthma. We have assessed the ability ...
Herasevich Vitaly - - 2011
To improve the safety of ventilator care and decrease the risk of ventilator-induced lung injury, we designed and tested an electronic algorithm that incorporates patient characteristics and ventilator settings, allowing near-real-time notification of bedside providers about potentially injurious ventilator settings. Electronic medical records of consecutive patients who received invasive ventilation ...
Armstrong Jean - - 2011
• The very high rates of convective ventilation reported recently in Equisetum telmateia (up to 120 cm(3)  min(-1) ; internal wind speed, 10 cm s(-1) ) prompted this study of a further eight species for the presence or absence of convection and the possible reasons for this. • Convection rates were examined in ...
Tracy M B - - 2011
Aim To compare a new two-person method (four hands) of delivering mask ventilation with a standard one-person method using the Laerdal self-inflating bag (SIB) and the Neopuff (NP) infant resuscitator in a manikin model. Background Recent studies of simulated neonatal resuscitation using bag and mask ventilation techniques have shown facemask ...
Lozano-Zahonero S - - 2011
The purpose of the present study is to introduce a novel methodology for adapting and upgrading decision-making strategies concerning mechanical ventilation with respect to different disease states into our fuzzy-based expert system, AUTOPILOT-BT. The special features are: (1) Extraction of clinical knowledge in analogy to the daily routine. (2) An ...
Fodil R - - 2011
Non-invasive ventilation is largely used to treat acute and chronic respiratory failure. This ventilation encounters a non-negligible rate of failure related to the used interface/mask, but the reasons for this failure remain unclear. In order to shed light on this issue and to better understand the effects of the geometrical ...
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