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Head Tilt

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1. Standard (head-down tilt) versus modified (without head-down tilt) postural drainage in infants and young children with cystic fibrosis. (PubMed)

Standard (head-down tilt) versus modified (without head-down tilt) postural drainage in infants and young children with cystic fibrosis. Postural drainage is used primarily in infants with cystic fibrosis from diagnosis up to the moment when they are mature enough to actively participate in self-administered treatments. However, there is a risk of gastroesophageal reflux associated with this technique.This is an update of a review published in 2015.To compare the effects of standard postural (...) drainage (15º to 45º head-down tilt) with modified postural drainage (15º to 30º head-up tilt) with regard to gastroesophageal reflux in infants and young children up to six years old with cystic fibrosis in terms of safety and efficacy.We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group's Cystic Fibrosis Trials Register. We also searched the reference lists of relevant articles and reviews. Additional searches were conducted on ClinicalTrials.gov and on the WHO International Clinical

2018 Cochrane

2. Standard (head-down tilt) versus modified (without head-down tilt) postural drainage in infants and young children with cystic fibrosis. (PubMed)

Standard (head-down tilt) versus modified (without head-down tilt) postural drainage in infants and young children with cystic fibrosis. Postural drainage is used primarily in infants with cystic fibrosis from diagnosis up to the moment when they are mature enough to actively participate in self-administered treatments. However, there is a risk of gastroesophageal reflux associated with this technique.To compare the effects of standard postural drainage (greater (30° to 45° head-down tilt (...) ) and lesser (15° to 20° head-down tilt)) with modified postural drainage (greater (30º head-up tilt) or lesser (15º to 20º head-up tilt)) with regard to gastroesophageal reflux in infants and young children up to six years old with cystic fibrosis in terms of safety and efficacy.We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group's Cystic Fibrosis Trials Register. We also searched the reference lists of relevant articles and reviews. Additional searches were conducted

2015 Cochrane

3. Effects of closed-loop stimulation vs. DDD pacing on haemodynamic variations and occurrence of syncope induced by head-up tilt test in older patients with refractory cardioinhibitory vasovagal syncope: the Tilt test-Induced REsponse in Closed-loop Stimula (PubMed)

Effects of closed-loop stimulation vs. DDD pacing on haemodynamic variations and occurrence of syncope induced by head-up tilt test in older patients with refractory cardioinhibitory vasovagal syncope: the Tilt test-Induced REsponse in Closed-loop Stimula Closed-loop stimulation (CLS) seemed promising in preventing the recurrence of vasovagal syncope (VVS) in patients with a cardioinhibitory response to head-up tilt test (HUTT) compared with conventional pacing. We hypothesized that the better

2019 Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology

4. Long-term follow-up of torsional augmentation surgery in a case of congenital ocular tilt reaction with head tilt. (PubMed)

Long-term follow-up of torsional augmentation surgery in a case of congenital ocular tilt reaction with head tilt. Torsional augmentation surgery was used to correct the anomalous head position (AHP) in a child with congenital ocular tilt reaction (OTR). The underlying neuropathology was hypoplasia involving the right hemicerebellum and contralateral brainstem. Postoperatively there was an acceptable and variable resolution of head tilt sustained over a 25-year follow-up period. These findings (...) suggest that early torsional augmentation surgery can effectively correct stable OTR head tilt in congenital cases over the long term.Copyright © 2019 American Association for Pediatric Ophthalmology and Strabismus. Published by Elsevier Inc. All rights reserved.

2018 JAAPOS - Journal of the American Association for Pediatric Ophthalmology and Strabismus

5. Visual effects on the subjective visual vertical and subjective postural head vertical during static roll‐tilt (PubMed)

Visual effects on the subjective visual vertical and subjective postural head vertical during static roll‐tilt Tilt perception is part of the perception of spatial orientation. It is determined not only by the allocentric gravity axis, but also by a second allocentric axis induced by visual information as well as by the egocentric body (head) axis induced by somatosensory information. The aim of this study was to quantify roll-tilt perception using the subjective visual vertical (SVV (...) ) and the newly developed subjective postural head vertical (SPHV) and to investigate the visual effects on both during static roll-tilt.Basic science.Nine male volunteers participated in this study. A flight simulator was used to create several roll-tilt environments that were then combined with visual information. SVV and SPHV were evaluated in healthy participants during static roll-tilt.The SVV evaluation revealed significant differences between the dark condition (control) and other visual conditions

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2017 Laryngoscope investigative otolaryngology

6. A Technique of Forced Expiratory Noise Time Evaluation Provides Distinguishing Human Pulmonary Ventilation Dynamics During Long-Term Head-Down and Head-Up Tilt Bed Rest Tests Simulating Micro and Lunar Gravity (PubMed)

A Technique of Forced Expiratory Noise Time Evaluation Provides Distinguishing Human Pulmonary Ventilation Dynamics During Long-Term Head-Down and Head-Up Tilt Bed Rest Tests Simulating Micro and Lunar Gravity Estimating the effect of microgravity/hypogravity on pulmonary ventilation function remains topical. Recently developed acoustic techniques based on the evaluation of the forced expiratory noise time (FETa) were hypothesized to be a promising tool for this aim. The aim of the protocol (...) is to study the effect of two different modalities of bed rest space simulations (microgravity and lunar gravity) on FETa and spirometric indices. The FETa in the frequency band of 200-2000 Hz, recorded above human trachea, was evaluated. The 21st-day exposure to 6 degree head-down tilt (HDT) bed rest, simulating microgravity, and 9.6 degree head-up tilt (HUT) bed rest with head-zero tilt (HZT) rest intervals (HUT + HZT), simulating lunar gravity, in statistically identical subgroups of five and six

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2018 Frontiers in physiology

7. The Effects of Optic Nerve Head Tilt on Visual Field Defects in Myopic Normal Tension Glaucoma: The Inter-eye Comparison Study. (PubMed)

The Effects of Optic Nerve Head Tilt on Visual Field Defects in Myopic Normal Tension Glaucoma: The Inter-eye Comparison Study. To evaluate whether optic nerve head (ONH) tilt has relations with the visual field (VF) defect in myopic normal tension glaucoma (NTG).Comparisons of variables were performed between less and more advanced VF defect groups in bilateral myopic NTG. Vertical, horizontal, maximal ONH tilt angles and angular location of maximal ONH tilt were measured using fundus (...) photography and spectral-domain (SD) optical coherence tomography (OCT). Logistic regression analysis was performed to evaluate variables associated with more advanced VF defect in bilateral myopic NTG.112 patients who have bilateral myopic NTG were included. Significant correlation was found between horizontal ONH tilt angle and angular location of maximal ONH tilt (R=0.45, P<0.001). In logistic regression analysis, a larger number of medications, greater horizontal ONH tilt and greater angular location

2019 Journal of Glaucoma

8. Baroreceptor activity and sensitivity: normal values in children and young adults using the head up tilt test. (PubMed)

Baroreceptor activity and sensitivity: normal values in children and young adults using the head up tilt test. Baroreceptor function in children and adolescents has not been well studied in the current literature, with a lack of agreed upon normal values. The authors hypothesize that there is a significant increase in the baroreceptor activity with a decrease in the sensitivity during the upright phase in comparison to the supine phases of the head upright tilt test (HUTT) protocol.Baroreceptor (...) evaluation was performed using the sequence method in 49 subjects ages 8-21 years, during the 3 phases of HUTT: supine, head up, and post-tilt supine positions. Baroreceptor Effectiveness Index (BEI) and the number and slope of baroreceptor events were recorded.On study of the events and slope values, there was a significant difference between the three phases of the HUTT with regard to the baroreceptor activity and sensitivity. No significant difference was found in BEI.Our study presents normal values

2019 Pediatric Research

9. Internal Carotid Artery Blood Flow Response to Anesthesia, Pneumoperitoneum, and Head-up Tilt during Laparoscopic Cholecystectomy. (PubMed)

Internal Carotid Artery Blood Flow Response to Anesthesia, Pneumoperitoneum, and Head-up Tilt during Laparoscopic Cholecystectomy. Cardiac output is an independent regulator of cerebral blood flow in healthy awake humansThe relationship between cardiac output and cerebral blood flow in anesthetized patients undergoing laparoscopy has not been previously characterized WHAT THIS ARTICLE TELLS US THAT IS NEW: At steady-state depth of anesthesia, in patients undergoing laparoscopic cholecystectomy (...) , creation of pneumoperitoneum decreased cardiac output and internal carotid artery blood flow while mean arterial pressure and end-tidal carbon dioxide levels remained unchanged BACKGROUND:: Little is known about how implementation of pneumoperitoneum and head-up tilt position contributes to general anesthesia-induced decrease in cerebral blood flow in humans. We investigated this question in patients undergoing laparoscopic cholecystectomy, hypothesizing that cardiorespiratory changes during

2019 Anesthesiology

10. Association of Genetics and B Vitamin Status With the Magnitude of Optic Disc Edema During 30-Day Strict Head-Down Tilt Bed Rest. (PubMed)

Association of Genetics and B Vitamin Status With the Magnitude of Optic Disc Edema During 30-Day Strict Head-Down Tilt Bed Rest. Optic disc edema among astronauts after long-duration spaceflight is associated with 1-carbon pathway single-nucleotide polymorphisms and B vitamin status. A recent strict 6° head-down tilt bed rest (HDTBR) study documented development of optic disc edema and increased total retinal thickness in participants exposed to carbon dioxide, 0.5%, for 30 days, but genetic

2019 JAMA ophthalmology

11. Head-up tilt testing for diagnosing vasovagal syncope: a meta-analysis

Head-up tilt testing for diagnosing vasovagal syncope: a meta-analysis Untitled Document The CRD Databases will not be available from 08:00 BST on Friday 4th October until 08:00 BST on Monday 7th October for essential maintenance. We apologise for any inconvenience.

2013 DARE.

12. Chronic head-down-tilt sleeping as physiological regulator of bone remodelling during diminished muscular activity in humans. (PubMed)

Chronic head-down-tilt sleeping as physiological regulator of bone remodelling during diminished muscular activity in humans. Head-down-tilt (HDT) sleeping with periodic fluid redistribution (PFR) assumes a significant importance by the possibility of regulating bone remodelling. We hypothesized that HDT sleeping with chronic PFR which expands fluid volume would contribute to and/or increase bone formation. Therefore, we studied the potential benefits of osteogenesis with HDT sleeping (...) of chronic PFR during diminished muscular activity (hypokinesia; HK).Studies were conducted on 40 male healthy volunteers. They were divided into four groups: head-down-tilt sleeping control subjects (HDTSCS), head-down-tilt sleeping hypokinetic subjects (HDTSHS), active control subjects (ACS) and hypokinetic subjects (HKS). The iliac crest cancellous bone and trabecular bone volume and cortical thickness were measured during pre-experimental period of 390 days and experimental period of 360 days.Iliac

2018 Clinical physiology and functional imaging

13. Knee-high compression socks minimize head-up tilt-induced cerebral and cardiovascular responses following dynamic exercise. (PubMed)

Knee-high compression socks minimize head-up tilt-induced cerebral and cardiovascular responses following dynamic exercise. In healthy individuals during a non-exercised state, knee-high compression socks (CS) may reduce the magnitude of lower limb venous pooling during orthostasis but are not effective at minimizing the incidence of pre-syncopal symptoms. However, exaggerated reductions in cerebral blood flow velocity (CBV) and cardiac stroke volume (SV) occur during passive head-up tilt (HUT

2018 Scandinavian journal of medicine & science in sports

14. Lower body negative pressure reduces optic nerve sheath diameter during head-down tilt. (PubMed)

Lower body negative pressure reduces optic nerve sheath diameter during head-down tilt. The microgravity ocular syndrome (MOS) results in significant structural and functional ophthalmic changes during 6-mo spaceflight missions consistent with an increase in cerebrospinal fluid (CSF) pressure compared with the preflight upright position. A ground-based study was performed to assess two of the major hypothesized contributors to MOS, headward fluid shifting and increased ambient CO2 (...) , on intracranial and periorbital CSF. In addition, lower body negative pressure (LBNP) was assessed as a countermeasure to headward fluid shifting. Nine healthy male subjects participated in a crossover design study with five head-down tilt (HDT) conditions: -6, -12, and -18° HDT, -12° HDT with -20 mmHg LBNP, and -12° HDT with a 1% CO2 environment, each for 5 h total. A three-dimensional volumetric scan of the cranium and transverse slices of the orbita were collected with MRI, and intracranial CSF volume

2018 Journal of applied physiology (Bethesda, Md. : 1985)

15. Effects of -12° head-down tilt with and without elevated levels of CO (PubMed)

Effects of -12° head-down tilt with and without elevated levels of CO Microgravity and elevated levels of CO2 are two common environmental stressors in spaceflight that may affect cognitive performance of astronauts. In this randomized, double-blind, crossover trial (SPACECOT), 6 healthy males (mean ± SD age: 41 ± 5 yr) were exposed to 0.04% (ambient air) and 0.5% CO2 concentrations during 26.5-h periods of -12° head-down tilt (HDT) bed rest with a 1-wk washout period between exposures (...) and the small effect sizes are major limitations of this study and its findings. The results should not be generalized beyond the group of investigated subjects until they are confirmed by adequately powered follow-up studies. NEW & NOTEWORTHY Simulating microgravity with exposure to 21 h of -12° head-down tilt bed rest caused a change in response strategy on a range of cognitive tests, with a statistically significant increase in response speed at the expense of accuracy. Cognitive efficiency

2018 Journal of applied physiology (Bethesda, Md. : 1985)

16. Quantitative MRI volumetry, diffusivity, cerebrovascular flow, and cranial hydrodynamics during head-down tilt and hypercapnia: the SPACECOT study. (PubMed)

Quantitative MRI volumetry, diffusivity, cerebrovascular flow, and cranial hydrodynamics during head-down tilt and hypercapnia: the SPACECOT study. To improve the pathophysiological understanding of visual changes observed in astronauts, we aimed to use quantitative MRI to measure anatomic and physiological responses during a ground-based spaceflight analog (head-down tilt, HDT) combined with increased ambient carbon dioxide (CO2). Six healthy, male subjects participated in the double-blinded (...) CSF pulsatility within the cerebral aqueduct and lateral ventricles.NEW & NOTEWORTHY Head-down tilt causes increased lateral ventricular volume and decreased cerebrovascular flow after 26.5 h. Additional short exposure to 3% ambient carbon dioxide levels causes increased cerebrovascular flow associated with increased cerebrospinal fluid pulsatility at the cerebral aqueduct. Head-down tilt with chronically elevated 0.5% ambient carbon dioxide and acutely elevated 3% ambient carbon dioxide causes

2018 Journal of applied physiology (Bethesda, Md. : 1985)

17. An international collaboration studying the physiological and anatomical cerebral effects of carbon dioxide during head-down tilt bed rest: the SPACECOT study. (PubMed)

An international collaboration studying the physiological and anatomical cerebral effects of carbon dioxide during head-down tilt bed rest: the SPACECOT study. Exposure to the microgravity environment results in various adaptive and maladaptive physiological changes in the human body, with notable ophthalmic abnormalities developing during 6-mo missions on the International Space Station (ISS). These findings have led to the hypothesis that the loss of gravity induces a cephalad fluid shift (...) , decreased cerebral venous outflow, and increased intracranial pressure, which may be further exacerbated by increased ambient carbon dioxide (CO2) levels on the ISS. Here we describe the SPACECOT study (studying the physiological and anatomical cerebral effects of CO2 during head-down tilt), a randomized, double-blind crossover design study with two conditions: 29 h of 12° head-down tilt (HDT) with ambient air and 29 h of 12° HDT with 0.5% CO2 The internationally collaborative SPACECOT study utilized

2018 Journal of applied physiology (Bethesda, Md. : 1985)

18. Does cardiac pacing reduce syncopal recurrences in cardioinhibitory vasovagal syncope patients selected with head-up tilt test? Analysis of a 5-year follow-up database. (PubMed)

Does cardiac pacing reduce syncopal recurrences in cardioinhibitory vasovagal syncope patients selected with head-up tilt test? Analysis of a 5-year follow-up database. Benefit of cardiac pacing in patients with vasovagal syncope (VVS) and cardioinhibitory response to head-up tilt test (HUTT) is still debated. We aimed at retrospectively assessing the long-term effect of cardiac pacing in a cohort routinely followed in our institutions.From a cohort of 1502 patients who performed HUTT between

2018 International journal of cardiology

19. Three Dimensional Evaluation of Posterior Pole and Optic Nerve Head in Tilted Disc (PubMed)

Three Dimensional Evaluation of Posterior Pole and Optic Nerve Head in Tilted Disc For over a century, tilted disc syndrome (TDS) has been defined vaguely. The lack of consensus of the terminology arises from the lack of understanding of the pathogenesis of this condition. Also, myopic discs with temporal crescents or peripapillary atrophy (PPA) are histologically indistinguishable from TDS. Therefore, we examined the morphological background of the extreme ONH appearances such as the myopic (...) tilted disc and the TDS by analyzing the posterior segment of the eye from a three-dimensional (3D) perspective. 107 eyes of 107 subjects were classified into 3 groups with respect to the optic disc torsion degrees: (1) mild torsion (0-30 degrees; 35 eyes) and (2) moderate torsion (30-60 degrees; 35 eyes) and (3) severe torsion (60-90 degrees; 37 eyes). SSOCT images were analyzed in coronal view, which supplements anterior-posterior depth (z axis in Cartesian coordinates). The amount of optic disc

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2018 Scientific reports

20. Cephalic Spread of Block With Head Down Tilt in Spinal Anaesthesia

Cephalic Spread of Block With Head Down Tilt in Spinal Anaesthesia Cephalic Spread of Block With Head Down Tilt in Spinal Anaesthesia - A Randomised Controlled Study - Full Text View - ClinicalTrials.gov Hide glossary Glossary Study record managers: refer to the if submitting registration or results information. Search for terms x × Study Record Detail Saved Studies Save this study Warning You have reached the maximum number of saved studies (100). Please remove one or more studies before (...) adding more. Cephalic Spread of Block With Head Down Tilt in Spinal Anaesthesia - A Randomised Controlled Study The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our for details. ClinicalTrials.gov Identifier: NCT03491319 Recruitment Status : Completed First Posted : April 9, 2018 Last Update Posted : April 9, 2018 Sponsor: Nitte University Information

2018 Clinical Trials

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