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Results 101 - 150 of 1621
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Lakhal K - - 2012
OBJECTIVE: The passive leg raising maneuver (PLR) for fluid responsiveness testing relies on cardiac output (CO) measurements or invasive measurements of arterial pressure (AP) whereas the initial hemodynamic management during shock is often based solely on brachial cuff measurements. We assessed PLR-induced changes in noninvasive oscillometric readings to predict fluid ...
Tveita Torkjel - - 2012
INTRODUCTION: Due to adverse effects of β- receptor agonists reported when applied during hypothermia, left ventricular (LV) cardiac effects of milrinone, a PDE3 inhibitor which mode of action is deprived the sarcolemmal β- receptor - G protein - PKA system, was tested during cooling to 15°C. METHODS: Sprague Dawley rats ...
Briski Elizabeta - - 2012
Increasing empirical evidence indicates the number of released individuals (i.e. propagule pressure) and number of released species (i.e. colonization pressure) are key determinants of the number of species that successfully invade new habitats. In view of these relationships, and the possibility that ships transport whole communities of organisms, we collected ...
Kill Clemens - - 2012
PURPOSE OF REVIEW: Artificial ventilation is one of the best known resuscitation procedures. It is generally accepted that there must be oxygen delivery to vital organs during cardiac arrest and resuscitation in order to prevent irreversible damage, but there is an increasing number of ventilation concepts for resuscitation. Traditional and ...
Williams Erin Marie - - 2012
Modern humans possess a highly derived thumb that is robust and long relative to the other digits, with enhanced pollical musculature compared with extant apes. Researchers have hypothesized that this anatomy was initially selected for in early Homo in part to withstand high forces acting on the thumb during hard ...
Northcott Carrie A - - 2012
Within the paraventricular nucleus (PVN), there is a balance between the excitatory and inhibitory neurotransmitters that regulate blood pressure; in hypertension, the balance shifts to enhanced excitation. Nitric oxide (NO) is an atypical neurotransmitter that elicits inhibitory effects on cardiovascular function. We hypothesized that reduced PVN NO led to elevations ...
Trepte C - - 2012
BACKGROUND: /st>Cardiac output (CO) monitoring can be useful in high-risk patients during one-lung ventilation (OLV), but it is unclear whether thermodilution-derived CO monitoring is valid during OLV. Therefore, we compared pulmonary artery (CO(PATD)) and transcardiopulmonary thermodilution (CO(TPTD)) with an experimental reference in a porcine model. METHODS: /st>CO(PATD) and CO(TPTD) were ...
Breskovic Toni - - 2012
The growing urge to breathe that occurs during breath-holding results in development of involuntary breathing movements (IBMs). The present study determined whether IBMs are initiated at critical levels of hypercapnia and/or hypoxia during maximal apnoea. Arterial blood gasses at the onset of IBM were monitored during maximal voluntary breath-holds. Eleven ...
Adolfsson Peter - - 2012
Abstract Background: The performance and accuracy of the Enlite(™) (Medtronic, Inc., Northridge, CA) sensor may be affected by microbubble formation at the electrode surface during hypo- and hyperbaric conditions. The effects of acute pressure changes and of prewetting of sensors were investigated. Materials and Methods: On Day 1, 24 sensors ...
Prtenjak Maja Telišman - - 2012
We examined the atmospheric conditions favourable to the occurrence of maximum concentrations of ragweed pollen with an extremely high risk of producing allergy. Over the 2002-2009 period, daily pollen data collected in Zagreb were used to identify two periods of high pollen concentration (> 600 grains/m(3)) for our analysis: period ...
Dörfelt René - - 2012
Objective  To evaluate the influence of fentanyl on intra-abdominal pressures in spontaneously breathing dogs during capnoperitoneum. Study design  Prospective clinical study. Animals  Eleven healthy client-owned and five healthy experimental dogs undergoing laparoscopy. Methods  Dogs were premedicated with acepromazine (0.03 mg kg(-1) IV) and carprofen (4 mg kg(-1) IV). Anaesthesia was induced with propofol and ...
Jeitziner M-M - - 2012
BACKGROUND: Critically ill patients often undergo unpleasant procedures. We quantified the effects of an unpleasant stimulus on physiological and behavioral parameters and evaluated how they are modified by sedation and analgesia. METHODS: A 6-month study in the 30-bed intensive care unit (ICU) of a university hospital examined 21 sedated patients ...
Regan J - - 2012
Objective and reliable evaluation of upper esophageal sphincter (UES) opening during swallowing based on videofluoroscopy and pharyngeal manometry challenges dysphagia clinicians. The functional lumen imaging probe (FLIP) is a portable tool based on impedance planimetry originally designed to measure esophogastric junction compliance. It is hypothesized that FLIP can evaluate UES ...
Yamamoto Kazuya - - 2012
Acute hypotension during maintenance hemodialysis (HD) is not only a critical complication, but also an independent risk factor for mortality in patients with chronic renal failure (CRF). This study was designed to clarify the mechanisms underlying excessive fall of blood pressure during HD. Fifty-six CRF patients with HD thrice a ...
Heck Frauke M - - 2012
Heck FM, Doeltgen SH, Huckabee M-L. Effects of submental neuromuscular electrical stimulation on pharyngeal pressure generation. OBJECTIVE: To investigate the immediate and late effects of submental event-related neuromuscular electrical stimulation (NMES) on pharyngeal pressure generation during noneffortful and effortful saliva swallows. DESIGN: Before-after trial. SETTING: Swallowing rehabilitation research laboratory. PARTICIPANTS: ...
Cohen Mark S - - 2012
To evaluate the biomechanical alterations that occur after traditional scaphoid excision and midcarpal arthrodesis with and without excision of the triquetrum. The hypothesis of this study was that removal of the triquetrum increases the radiolunate contact pressure. We cyclically moved 10 fresh cadaver wrists using a wrist joint motion simulator ...
Singh Karen E - - 2012
A 79-year-old patient who underwent mitral valve replacement experienced prolonged elevated central venous pressure associated with poor venous return during a cardiopulmonary bypass. After the procedure, the patient was noted to have spontaneous bleeding from the left ear. Otolaryngologic examination in the operating room showed no trauma in the exterior ...
Beda Alessandro - - 2012
The physiological importance of respiratory sinus arrhythmia (RSA) and cardioventilatory coupling (CVC) has not yet been fully elucidated, but these phenomena might contribute to improve ventilation/perfusion matching, with beneficial effects on gas exchange. Furthermore, decreased RSA amplitude has been suggested as an indicator of impaired autonomic control and poor clinical ...
Ganio Matthew S - - 2012
During moderate actual or simulated hemorrhage, as cardiac output decreases, reductions in systemic vascular conductance (SVC) maintain mean arterial pressure (MAP). Heat stress, however, compromises the control of MAP during simulated hemorrhage, and it remains unknown whether this response is due to a persistently high SVC and/or a low cardiac ...
Paradis Norman A - - 2012
BACKGROUND: The fraction of cardiac arrest patients presenting with pulseless electrical activity is increasing, and it is likely that many of these patients have pseudo-electromechanical dissociation (P-EMD), a state in which there is residual cardiac contraction without a palpable pulse. The efficacy of cardiopulmonary resuscitation (CPR) with external chest compression ...
Amanpour Saeid - - 2012
PURPOSE: Although bronchoscopy can be safely performed through endotracheal tube in most intubated critically ill patients, sometimes it could lead to complications such as hypoxia and high airway pressures. Theoretically, transglottic bronchoscopy (TGB) does not interfere with mechanical ventilation and could avoid these complications. In a two-period crossover study, we ...
Kim Sang Hun - - 2012
PURPOSE: The main problem of one-lung ventilation (OLV) is hypoxemia. The use of a high tidal volume for preventing hypoxemia during OLV is controversial. We compared the effects of a high tidal volume versus a low tidal volume with or without PEEP on arterial oxygen tension (PaO(2)) and pulmonary mechanics ...
Volsko Teresa A - - 2012
BACKGROUND: Technological advances have increased ventilator mode complexity and risk of operator error. The study objective was to compare differences in volume control (VC) ventilation with set-point and dual targeting. Two hypotheses were tested; (1)VT delivery is different with VC using set-point versus dual targeting during active versus passive breathing ...
Son Jung Tae - - 2012
The purpose of this study was to examine whether drinking green tea can prevent postprandial drops in blood pressure in older adults. Participants included 29 older adults who had experienced postprandial drops in systolic blood pressure of more than 15 mmHg in a previous study. During the experimental phase, each ...
Omari Taher I - - 2012
INTRODUCTION: The measurement of the physical extent of opening of the upper esophageal sphincter (UES) during bolus swallowing has to date relied on videofluoroscopy. Theoretically luminal impedance measured during bolus flow should be influenced by luminal diameter. In this study we measured the UES nadir impedance (lowest value of impedance) ...
Handlin Linda - - 2012
Abstract Objective: This study investigated possible influences of medical interventions during labor on maternal blood pressure during a breastfeed 2 days postpartum. Subjects and Methods: Sixty-six primiparae with normal deliveries were consecutively recruited. Blood pressure was measured at -5, 10, 30, and 60 minutes during a morning breastfeed 2 days ...
Gakwaya Simon - - 2012
BACKGROUND: Negative airway pressure loading such as seen during obstructive apnea/hypopnea may influence upper airway (UA) mechanical properties. We measured the effects of such loading on UA mechanical properties during wakefulness and assessed the potential link with night-time apnea worsening. METHODS: Twitch stimulations of the phrenic nerve were applied before ...
Takagi Shunsuke - - 2012
To evaluate the relationship between body mass index (BMI) and blood pressure (BP) elevation during electroconvulsive therapy (ECT). Descriptive epidemiological study. Operating room of a university-affiliated hospital. All patients who received ECT at the Tokyo Metropolitan Hiroo Hospital from May 2005 to March 2009. All patients received routine ECT treatment. ...
Fu Q - - 2012
Respiration variation in arterial pulse pressure (ΔPP) and pulse oximetry plethysmographic waveform amplitude (ΔPOP) are accurate predictors of fluid responsiveness in mechanically ventilated patients. We hypothesized that stroke volume variation (SVV) and pleth variability index (PVI) can predict fluid responsiveness in mechanically ventilated patients during major surgical procedures in Hans ...
Yiallourou Stephanie R - - 2012
Abnormal blood pressure control is implicated in the sudden infant death syndrome (SIDS). However, no data exist on normal development of blood pressure control during infancy. This study assessed maturation of autonomic control of blood pressure and heart rate during sleep within the first 6 months of life. Term infants ...
Masdeu Maria J - - 2012
Patients with obstructive sleep apnea may have difficulty exhaling against positive pressure, hence limiting their acceptance of continuous positive airway pressure (CPAP). C-Flex is designed to improve comfort by reducing pressure in the mask during expiration proportionally to expiratory airflow (3 settings correspond to increasing pressure changes). When patients use ...
Hepponstall J Michele - - 2012
RATIONALE: High-frequency jet ventilation (HFJV) is often used to treat infants with pathologies associated with gas trapping and abnormal lung mechanics, who are sensitive to the adverse effects of suction. OBJECTIVE: This study aimed to investigate the effect of closed suction (CS), catheter size, and the use of active post-suction ...
Mascarenhas Sérgio - - 2012
The Monro-Kellie doctrine states that the interior of the cranium is formed of three main components: blood, fluid and cerebral parenchyma. An increase in the volume of one or more components may increase the intracranial pressure (ICP). This doctrine also affirms that the skull cannot be expanded after the closure ...
Van Zundert T C R V - - 2012
We test the hypothesis that there are differences in performance among three extra-glottic airway devices during spontaneous breathing anaesthesia. One hundred and fifty consecutive patients (ASA Grade 1-2, aged 18-80 yr) were randomly allocated for airway management with the i-gel (Intersurgical Ltd, Wokingham, Berkshire UK), the LMA-ProSeal and the LMA-Supreme ...
Schmitt Melanie - - 2012
We implemented ventricular infusion studies on 33 patients suspected of idiopathic normal pressure hydrocephalus (iNPH), benign intracranial hypertension (BIH) or occlusive hydrocephalus (HOC) in order to confirm shunt indications. The initial scope was to study O(2) supply during infusion tests to exclude further violation of already vulnerable brains during ICP ...
Santamarta D - - 2012
The complexity of the intracranial pressure (ICP) signal decreases with intracranial hypertension in children with acute brain injury as well as during infusion studies in adults with hydrocephalus. In this study we have analysed the pressure signal obtained in the lumbar subarachnoid space during infusion testing. The pulse amplitude rises ...
Chen I-Ju - - 2012
Introduction. Intradialytic hypotension (IDH) is a common complication during hemodialysis which may increase mortality risks. Low dose of Korean red ginseng (KRG) has been reported to increase blood pressure. Whether KRG can improve hemodynamic stability during hemodialysis has not been examined. Methods. The 8-week study consisted of two phases: observation ...
Lee Su Hyun - - 2012
Stress-induced cardiomyopathy (SICM) presenting as an acute myocardial dysfunction is characterized by transient left ventricular wall motion abnormality, which has been known to be associated with excessive catecholamine production caused due to various types of stress. Sympathetic hyperactivity is common during the perioperative period, and reports of SICM occurring during ...
Rubinger Dvora - - 2012
The mechanisms of intradialytic increases in blood pressure are not well defined. The present study was undertaken to assess the role of autonomic nervous system activation during intradialytic hypertensive episodes. Continuous interbeat intervals (IBI) and systolic blood pressure (SBP) were monitored during hemodialysis in 108 chronic patients. Intradialytic hypertensive episodes ...
A'roch Roman - - 2012
Tissue velocity echocardiography is increasingly used to evaluate global and regional cardiac function. Previous studies have suggested that the quantitative measurements obtained during ejection are reliable indices of contractility, though their load-sensitivity has been studied in different settings, but still remains a matter of controversy. We sought to characterize the ...
Le Victoria P - - 2012
Blood pressure increases significantly during embryonic and postnatal development in vertebrate animals. In the mouse, blood flow is first detectable around embryonic day (E) 8.5(1). Systolic left ventricular (LV) pressure is 2 mmHg at E9.5 and 11 mmHg at E14.5(2). At these mid-embryonic stages, the LV is clearly visible through ...
Esquinas Rodriguez Antonio M - - 2012
Inadequate gas conditioning during non-invasive ventilation (NIV) can impair the anatomy and function of nasal mucosa. The resulting symptoms may have a negative effect on patients' adherence to ventilatory treatment, especially for chronic use. Several parameters, mostly technical aspects of NIV, contribute to inefficient gas conditioning. Factors affecting airway humidity ...
Morimont Philippe - - 2012
Peak first derivative of femoral artery pressure (arterial dP/dtmax) derived from fluid-filled catheter remains questionable to assess left ventricular (LV) contractility during shock. The aim of this study was to test if arterial dP/dtmax is reliable for assessing LV contractility during various hemodynamic conditions such as endotoxin-induced shock and catecholamine ...
Zhang Yi - - 2012
To investigate blood flow (BF) in the human retina/choroid during rest and handgrip isometric exercise using magnetic resonance imaging (MRI). Four healthy volunteers (25-36 years old) in multiple sessions (1-3) on different days. MRI studies were performed on a 3-Tesla scanner using a custom-made surface coil (7×5cm in diameter) at ...
Matsumura Kenta - - 2012
Frequent fish consumption is related to a lower risk of coronary heart disease. However, the physiological mechanisms underlying this cardioprotective effect are as yet unknown. We therefore examined certain cardiovascular physiological variables of fish eaters during rest, whilst conducting mental arithmetic, and during recovery. The participants were 12 fish eaters ...
Khazaei Majid - - 2012
In this study, we investigated the role of exogenous NO donor, sodium nitroprusside (SNP), on hemodynamic responses and survival rate during decompensated hemorrhagic shock in normotensive and hypertensive rat. Male wistar rats were divided into normotensive and hypertensive groups (n = 12 each). Then, the animals were subjected to decompensated ...
Trueb Lionel - - 2012
Nitric oxide (NO) regulates arterial pressure by modulating peripheral vascular tone and sympathetic vasoconstrictor outflow. NO synthesis is impaired in several major cardiovascular disease states. Loss of NO-induced vasodilator tone and restraint on sympathetic outflow could result in exaggerated pressor responses to mental stress. We, therefore, compared the sympathetic (muscle ...
Meyburgh D - - 2012
To assess the relationships between progression of target-organ damage and cardiovascular, cortisol and coping responses in black urban Africans. Urban black African gender groups (n = 200) aged 21-62 years from the Sympathetic Activity and Ambulatory Blood Pressure in Africans study were stratified into normotensive and hypertensive groups. Resting and ...
Laciuga Helena - - 2012
Expiratory muscle strength training (EMST) is a rehabilitative program that has been tested for outcomes related to respiratory muscle strength, cough, swallow, and voice function in healthy young adult, elderly individuals, and in patients with progressive neurodegenerative disease. Because EMST has been used in patient care, the associated cardiovascular responses ...
Mc Causland Finnian R FR Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, MA 02446, USA. - - 2012
Intradialytic hypotensive events are common among hemodialysis patients and are associated with a variety of patient- and procedure-related factors, including intradialytic decline in plasma osmolality. Prior studies and practice have suggested that administration of osmotically active drugs may ameliorate blood pressure decline during chronic hemodialysis. Clinical and treatment data were ...
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