Read by QxMD icon Read

Leg rising maneuver

Joseph Miller, Chuan-Xing Ho, Joy Tang, Richard Thompson, Jared Goldberg, Ahmed Amer, Bashar Nahab
OBJECTIVES: The primary objective of this study was to test if fasting volunteers exhibit fluid responsiveness using noninvasive hemodynamic measurements. The secondary objective was to test a passive leg raise (PLR) maneuver as a diagnostic predictor of fluid responsiveness. METHODS: This was a quasi-experimental design involving healthy volunteers. Subjects were excluded for pregnancy and congestive heart failure. Following a 12-hour fast, subjects had baseline hemodynamic monitoring recorded using noninvasive, continuous pulse contour analysis...
February 2016: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
Ya-Cheng Chou, Wei-Shun Yu, Ke-Jung Huang, Pei-Chun Lin
Inspired by the observation that the cockroach changes from a tripod gait to a different gait for climbing high steps, we report on the design and implementation of a novel, fully autonomous step-climbing maneuver, which enables a RHex-style hexapod robot to reliably climb a step up to 230% higher than the length of its leg. Similar to the climbing strategy most used by cockroaches, the proposed maneuver is composed of two stages. The first stage is the 'rearing stage,' inclining the body so the front side of the body is raised and it is easier for the front legs to catch the top of the step, followed by the 'rising stage,' maneuvering the body's center of mass to the top of the step...
September 2012: Bioinspiration & Biomimetics
Christophe Soltner, Romain Dantec, Frédéric Lebreton, Julien Huntzinger, Laurent Beydon
OBJECTIVE: The amplitude of R-wave in DII lead (RDII) has been shown to correlate to central blood volume in animal and healthy volunteers. The aim of this study was to assess if change in RDII (DeltaRDII) after passive leg rise (PLR) and fluid loading would allow detecting preload dependence in intensive care ventilated patients. This parameter was compared to concomitant changes in pulse arterial pressure (DeltaPP). METHODS: Observational study in 40 stable sedated and ventilated cardiac surgery patients studied postoperatively...
April 2010: Journal of Clinical Monitoring and Computing
C T Paul Krediet, Ivar G J M de Bruin, Karin S Ganzeboom, Mark Linzer, Johannes J van Lieshout, Wouter Wieling
Tensing of lower body muscles without or with leg crossing (LBMT, LCMT), whole body tensing (WBT), squatting, and sitting with the head bent between the knees ("crash position", HBK) are believed to abort vasovagal reactions. The underlying mechanisms are unknown. To study these interventions in patients with a clinical history of vasovagal syncope and a vasovagal reaction during routine tilt table testing, we measured blood pressure (BP) continuously with Finapres and derived heart rate, stroke volume, cardiac output (CO), and total peripheral resistance using Modelflow...
November 2005: Journal of Applied Physiology
Michele Brignole
"Neurally-mediated (reflex) syncope" refers to a reflex response that, when triggered, gives rise to vasodilation and/or bradycardia; however, the contribution of each of these two factors to systemic hypotension and cerebral hypoperfusion may differ considerably. The initial evaluation may lead to a certain diagnosis in the case of classical vasovagal syncope and of situational syncope. Classical vasovagal syncope is diagnosed if precipitating events such as fear, severe pain, emotional distress, instrumentation or prolonged standing, are associated with typical prodromal symptoms...
March 2005: Italian Heart Journal: Official Journal of the Italian Federation of Cardiology
D R Pedersen, J J Callaghan, T D Brown
Presently, the basis for optimal cup positioning to minimize the likelihood of dislocation rests upon subjective clinical impressions. To help elucidate optimal cup positioning more objectively, and to clarify the distinction between impingement avoidance and dislocation avoidance, kinematic and kinetic inputs for seven dislocation-prone activities were applied to finite element models of a contemporary 22-mm modular total hip reconstruction. Twenty-five cup placement positions (combinations of 30, 40, 50, 60, and 70 degrees of abduction with 0, 10, 20, 30, and 40 degrees of anteversion) were chosen to include the conventional 'safe zone' of 30-50 degrees of tilt and 5-25 degrees of anteversion...
May 2005: Medical Engineering & Physics
Nynke van Dijk, Ivar G J M de Bruin, Janneke Gisolf, H A C M Rianne de Bruin-Bon, Mark Linzer, Johannes J van Lieshout, Wouter Wieling
Physical maneuvers can be applied to abort or delay an impending vasovagal faint. These countermaneuvers would be more beneficial if applied as a preventive measure. We hypothesized that, in patients with recurrent vasovagal syncope, leg crossing produces a rise in cardiac output (CO) and thereby in blood pressure (BP) with an additional rise in BP by muscle tensing. We analyzed the age and gender effect on the BP response. To confirm that, during the maneuvers, Modelflow CO changes in proportion to actual CO, 10 healthy subjects performed the study protocol with CO evaluated simultaneously by Modelflow and by inert gas rebreathing...
February 2005: Journal of Applied Physiology
Robert M Rennebohm, Karla Jones, Adam M Huber, Susan H Ballinger, Suzanne L Bowyer, Brian M Feldman, Jeanne Hicks, Ildy M Katona, Carol B Lindsley, Frederick W Miller, Murray H Passo, Maria D Perez, Ann M Reed, Carol A Wallace, Patience H White, Lawrence S Zemel, Peter A Lachenbruch, John R Hayes, Lisa G Rider
OBJECTIVE: To document and evaluate the scores that normal, healthy children achieve when performing 9 maneuvers of the Childhood Myositis Assessment Scale (CMAS). METHODS: A total of 303 healthy children, 4-9 years of age, were scored as they performed 9 CMAS maneuvers. The data were then evaluated to determine whether normal scores for some maneuvers are age and sex dependent. RESULTS: All children were able to achieve maximum possible scores for the supine to prone, supine to sit, floor sit, floor rise, and chair rise maneuvers...
June 15, 2004: Arthritis and Rheumatism
Frank Pott, Johannes J Van Lieshout, Kojiro Ide, Per Madsen, Niels H Secher
Lifting of a heavy weight may lead to "blackout" and occasionally also to cerebral hemorrhage, indicating pronounced consequences for the blood flow through the brain. We hypothesized that especially strenuous respiratory straining (a Valsalva-like maneuver) associated with intense static exercise would lead to a precipitous rise in mean arterial and central venous pressures and, in turn, influence the middle cerebral artery blood velocity (MCA V(mean)) as a noninvasive indicator of changes in cerebral blood flow...
April 2003: Journal of Applied Physiology
Virginia A Imadojemu, Kevin Gleeson, Kristen S Gray, Lawrence I Sinoway, Urs A Leuenberger
Obstructive apnea during sleep is associated with a substantial transient blood pressure elevation. The mechanism of this pressor response is unclear. In this study we measured muscle sympathetic nerve activity (MSNA), mean arterial pressure (Psa), and mean limb blood velocity as an index of blood flow (MBV, Doppler) and calculated changes in limb vascular resistance during and after apneas during both wakefulness and sleep in patients with the obstructive sleep apnea syndrome. Immediately postapnea during sleep Psa increased significantly compared with the earlier stages of apnea and this was preceded by a rise of MSNA (n = 5)...
January 1, 2002: American Journal of Respiratory and Critical Care Medicine
R D Farley
The scanning electron microscope was used to study the changing features of scorpion embryos from the blastula through early stages in the development of appendages. The earliest scorpion fossils (Silurian period) have structures more advanced than the embryos herein, so the possibility is considered that these embryos still retain and display some features indicative of evolutionary patterns in adult pre-Silurian ancestors. The blastodisc stage is followed by a knob-like germinal center that gives rise to most of the embryo body...
October 2001: Journal of Morphology
G P Guyton, C Jeng, L E Krieger, R A Mann
HYPOTHESES/PURPOSE: The medial displacement calcaneal osteotomy has recently become a popular addition to flexor digitorum longus transfer for stage II posterior tibial tendon dysfunction. We reviewed the results of 26 patients who had undergone the procedure at an average of 32 months prior to follow-up (range 12 to 70 months) with particular attention to objective functional parameters. CONCLUSIONS/SIGNIFICANCE: FDL transfer and medial displacement calcaneal osteotomy provides good functional and symptomatic results in the middle-term...
August 2001: Foot & Ankle International
F Bahrami, R Riener, P Jabedar-Maralani, G Schmidt
OBJECTIVE: An experimental study of the sit-to-stand transfer in healthy adults with/without arm-support and in paraplegic patients with/without electrical stimulation of the quadriceps muscles was performed. The study was aimed to compare the joint torques, momentum transfer hypothesis, and stability of the sit-to-stand transfer in the healthy and paraplegic subjects. METHODS: A planar 3-linkage rigid body model was used to compute the body-segmental linear momentum and the reaction forces and torques at the joints from measured data...
February 2000: Clinical Biomechanics
C Balestra, P Germonpré, A Marroni
Scuba divers with patent foramen ovale (PFO) may be at risk for paradoxical nitrogen gas emboli when performing maneuvers that cause a rebound blood loading to the right atrium. We measured the rise and fall in intrathoracic pressure (ITP) during various maneuvers in 15 divers. The tests were standard isometric exercises (control), forceful coughing, knee bend (with and without respiration blocked), and Valsalva maneuver (maximal, gradually increased to reach control ITP, and as performed by divers to equalize middle ear pressure)...
1998: Undersea & Hyperbaric Medicine: Journal of the Undersea and Hyperbaric Medical Society, Inc
P O Riley, D E Krebs, R A Popat
Background sit-to-stand (STS) failure is a transient loss of balance that can engender falls among elders. The purpose of this paper is to describe the mechanisms whereby failed STS differs from successful STS. The authors compared successful STS from 11 normal elders to 20 "sitback" and 20 "step" type failed STS's in 13 subjects. Kinematic and kinetic data were incorporated into our 11-segment whole body model to estimate the net joint forces and torques and body segment momenta. Significant between group differences in the magnitude and timing of momentum generation and dissipation, knee extensor torques and the magnitude of the vertical ground reaction force were identified...
December 1997: IEEE Transactions on Rehabilitation Engineering
R Willeput, C Rondeux, A De Troyer
It is conventionally believed that venous return to the heart increases during inspiration through the combined effect of the fall in intrathoracic pressure and the squeezing of the splanchnic veins by diaphragm descent. In the present study we have tested the hypothesis that in humans venous return from the legs decreases, rather than increases, during inspiration as a result of the rise in abdominal pressure. Ten normal subjects were examined in recumbent posture during various respiratory maneuvers. Venous return from the legs was monitored using an ultrasonic flow recorder (Doppler effect) placed over the femoral veins...
October 1984: Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
R Watanabe, H Fujiwara, T Soma
In a patient with mitral stenosis we previously found a negative periphero -central pressure gradient (P-C PG) despite a forward peripheral venous blood flow velocity ( PVBFV ) during supine leg exercise. The present study was undertaken to confirm this finding and elucidate its mechanism. In 6 patients with congestive heart failure, P-C PG was reversed from -2.4 to -18.7 cm H2O for 1 to 5 minutes during exercise. PVBFV , measured simultaneously with peripheral venous pressure (Pv) in 8 subjects, remained positive; 5 of these were patients with a negative P-C PG...
May 1984: Japanese Circulation Journal
E A Harman, P N Frykman, E R Clagett, W J Kraemer
In order to investigate intra-thoracic pressure (ITP) and intra-abdominal pressure (IAP) during lifting and jumping, 11 males were monitored as they performed the dead lift (DL), slide row (SR), leg press (LP), bench press (BP), and box lift (BL) at 50, 75 and 100% of each subject's four-repetition maxima, the vertical jump (VJ), drop jump (DJ) from 0.5 and 1.0 m heights, and Valsalva maneuver (VM). Measurements were made of peak pressure, time from pressure rise to switch-marked initiation of body movement, and time from the movement to peak pressure...
April 1988: Medicine and Science in Sports and Exercise
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"