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Saipriya Tewari, Poonam Bhadoria, Sonia Wadhawan, Sudha Prasad, Amit Kohli
STUDY OBJECTIVE: Day care surgery is an important arena for monitors of anesthetic depth where minimizing drug use is essential for rapid turnover. Underdosage, on the other hand, carries the risks of intraoperative awareness and pain. Transvaginal oocyte retrieval (TVOR), often performed under total intravenous anesthesia using propofol and fentanyl in Indian patients, is a procedure of special interest because, in addition to the above concerns, toxic effects of propofol on oocytes have been described...
November 2016: Journal of Clinical Anesthesia
Rosalyn Schneider, Mark F Walker
The goal of this study was to assess the effect of amplitude and frequency predictability on the performance of the translational vestibulo-ocular reflex (tVOR). Eye movements were recorded in 5 subjects during continuous vertical translation that consisted of a series of segments with: 1) 3 amplitudes at constant frequency (2 Hz) or 2) 3 different frequencies (1.6, 2, 2.5 Hz). Stimulus changes were presented in a pseudo-random order. We found that there was little change in the tVOR immediately after an unexpected stimulus change, as if eye velocity were being driven more by an expectation based on previous steady-state motion than by current head translation...
2014: Journal of Vestibular Research: Equilibrium & Orientation
Kazem Nouri, Katharina Walch, Regina Promberger, Christine Kurz, Clemens B Tempfer, Johannes Ott
A case series of haematoperitoneum caused by ovarian bleeding after transvaginal oocyte retrieval (TVOR) is presented and all published cases summarized. In a retrospective case series, four patients with ovarian bleeding after TVOR were included. In addition, a pooled analysis of all published cases (n = 32) who underwent surgical intervention for severe haematoperitoneum caused by ovarian bleeding after TVOR was carried out. Main outcome measures were incidence, risk factors, course and intraoperative findings...
December 2014: Reproductive Biomedicine Online
Emre Goksan Pabuccu, Salih Taskin, Cem Atabekoglu, Murat Sonmezer
Severe pelvic infections following ultrasound-guided transvaginal oocyte retrieval (TVOR) are rare but challenging. Ovarian abscess formation is one of the consequences and management of such cases as highly debated in pregnant patients. In this case report, an early fetal loss following laparoscopic management of ovarian abscess is described and possible etiologies are discussed.
October 2014: International Journal of Fertility & Sterility
J Dits, W M King, J van der Steen
Vestibulo-ocular reflexes are the fastest compensatory reflex systems. One of these is the translational vestibulo-ocular reflex (TVOR) which stabilizes the gaze at a given fixation point during whole body translations. For a proper response of the TVOR the eyes have to counter rotate in the head with a velocity that is inversely scaled to viewing distance of the target. It is generally assumed that scaling of the TVOR is automatically coupled to vergence angle at the brainstem level. However, different lines of evidence also argue that in humans scaling of the TVOR also depends on a mechanism that pre-sets gain on a priori knowledge of target distance...
August 29, 2013: Neuroscience
Ke Liao, Rosalyn M Schneider, Stacia S Yaniglos, Giovanni Bertolini, Paul Glendinning, Robert N Sawyer, Millard Reschke, R John Leigh
Prior studies indicate that the human translational vestibulo-ocular reflex (tVOR) generates eye rotations approximately half the magnitude required to keep the line of sight pointed at a stationary object--a compensation ratio (CR) of ∼0.5. We asked whether changes of visual or vestibular stimuli could increase the CR of tVOR. First, subjects viewed their environment through an optical device that required eye movements to increase by ∼50% to maintain fixation of a stationary visual target. During vertical translation, eye movements did increase, but tVOR CR remained at ∼0...
September 2011: Annals of the New York Academy of Sciences
Mark Walker, Ke Liao
We studied the translational vestibulo-ocular reflex (tVOR) in four healthy human subjects during complex, unpredictable sum-of-sines head motion (combination of 0.73, 1.33, 1.93, and 2.93 Hz), while subjects viewed a target 15 cm away. Ideal eye velocity was calculated from recorded head motion; actual eye velocity was measured with scleral coils. The gain and phase for each frequency component was determined by least-squares optimization. Gain averaged approximately 40% and did not change with frequency; phase lag increased with frequency to a maximum of 66°...
September 2011: Annals of the New York Academy of Sciences
Min Wei, Nan Lin, Shawn D Newlands
Translational motion induces retinal image slip which varies with object distance. The brain must know binocular eye position in real time in order to scale eye movements so as to minimize retinal slip. Two potential sources of eye position information are orbital proprioception and an internal representation of eye position derived from central ocular motor signals. To examine the role of orbital proprioceptive information, the position of the left eye was perturbed by microstimulation of the left abducens nerve during translational motion to the right or left along the interaural axis in two rhesus macaques...
November 2011: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Tamer M Yalcinkaya, Munire Erman-Akar, Jamie Jennell
BACKGROUND: Severe postovum retrieval complications such as tuboovarian abscess are rare. We present an early pelvic infection case following egg retrieval. CASE: A 31-year-old woman with unexplained infertility developed early pelvic infection subsequent to transvaginal oocyte retrieval (TVOR). Broad spectrum antibiotics were administered. Upon persistence of fever and ultrasonographic appearance of probable abscess, transvaginal ultrasound-guided drainage was performed on post-TVOR day 9 as well as posterior colpotomy and T-drain replacement into the cul de sac...
January 2011: Journal of Reproductive Medicine
Mark F Walker, Jing Tian, Xiaoyan Shan, Rafael J Tamargo, Howard Ying, David S Zee
BACKGROUND: The otolith-driven translational vestibulo-ocular reflex (tVOR) generates compensatory eye movements to linear head accelerations. Studies in humans indicate that the cerebellum plays a critical role in the neural control of the tVOR, but little is known about mechanisms of this control or the functions of specific cerebellar structures. Here, we chose to investigate the contribution of the nodulus and uvula, which have been shown by prior studies to be involved in the processing of otolith signals in other contexts...
2010: PloS One
Ke Liao, Mark F Walker, Anand C Joshi, Millard Reschke, Michael Strupp, Judith Wagner, R John Leigh
PURPOSE: During locomotion, head perturbations, consisting of rotations and translations (linear movements), occur with predominant frequencies of 0.5-5.0 Hz. The vestibular reflexes act at short latency to safeguard clear vision and stable posture during locomotion. Much is known about the angular vestibulo-ocular reflex (aVOR) in response to head rotations, which depend on the semicircular canals of the vestibular labyrinth. However, the means to test reliably the linear or translational vestibulo-ocular reflex (tVOR), which depends on the otolithic organs, has only become available more recently...
2010: Restorative Neurology and Neuroscience
Xiumei Zhen, Jie Qiao, Caihong Ma, Yanhong Fan, Ping Liu
OBJECTIVE: To investigate the risk factors for intraperitoneal bleeding following transvaginal oocyte retrieval (TVOR). METHODS: Retrospective review of records from patients who underwent TVOR between 2004 and 2008. Patients who had mild and severe intraperitoneal bleeding were compared with the same number of patients without intraperitoneal bleeding (control group) who underwent oocyte retrieval on the same day performed by the same doctor as those who experienced bleeding...
January 2010: International Journal of Gynaecology and Obstetrics
Ke Liao, Mark F Walker, Anand Joshi, Millard Reschke, Michael Strupp, R John Leigh
Geometric considerations indicate that the human translational vestibulo-ocular reflex (tVOR) should have substantially different properties than the angular vestibulo-ocular reflex (aVOR). Specifically, tVOR cannot simultaneously stabilize images of distant and near objects on the retina. Most studies make the tacit assumption that tVOR acts to stabilize foveal images even though, in humans, tVOR is reported to compensate for less than 60% of foveal image motion. We have determined that the compensation gain (eye rotational velocity/required eye rotational velocity to maintain foveal target fixation) of tVOR is held steady at approximately 0...
May 2009: Annals of the New York Academy of Sciences
Ke Liao, Mark F Walker, Anand Joshi, Millard Reschke, Zhong Wang, R John Leigh
In a prior study we reported that the human translational vestibulo-ocular reflex (tVOR) in response to vertical (bob) 2 Hz oscillations generated eye rotations of only 60% of those required to keep the eyes pointed at a stationary visual target, whether located at near (approximately 17 cm) or far (2 m). Best responses occurred in ambient illumination and we concluded that relative image motion between the target and background was an important determinant of tVOR behaviour. To investigate further how visual conditions influenced tVOR, we measured responses as subjects binocularly viewed the bridge of their own nose in a mirror at approximately 8...
2008: Progress in Brain Research
Neil P M Todd, Sally M Rosengren, James G Colebatch
OBJECTIVE: Recent work has demonstrated the existence of ocular vestibular evoked myogenic potentials (OVEMPs), which likely reflect projections underlying the translational vestibular ocular reflex (TVOR). We examined extraocular muscle activity associated with impulsive acceleration of the head in the transmastoid plane. METHODS: Accelerometry was measured in 4 subjects in response to acceleration impulses produced by a gamma function delivered with a Minishaker (4810, Bruel & Kjaer)...
July 2008: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
Helena von Eye Corleta, Marcelo Moretto, Angela Marcon D'Avila, Milton Berger
OBJECTIVE: To report a case of ureterovaginal fistula secondary to transvaginal oocyte retrieval (TVOR). DESIGN: Case report. SETTING: IVF Center IN a private hospital. PATIENT(S): A 31-year-old woman presented immediately after TVOR with right lower abdominal pain with irradiation to the suprapubic area and vaginal discharge. INTERVENTION(S): Vaginal examination, creatinine dosage in plasma and vaginal discharge, excretory urography...
November 2008: Fertility and Sterility
Gemechu Wirtu, C Earle Pope, Dale L Paccamonti, Robert A Godke, Betsy L Dresser
The limited availability of gametes is a major factor hindering the development and application of assisted reproductive technologies (ART) in large non-domestic ungulates. This is partly due to the small number of captive animals and handling difficulties associated with procedures for gamete recovery. In the present study, results are reported of multi-year studies on ovarian stimulation and oocyte retrieval by ultrasonographic-guided transvaginal follicular aspiration and subsequent in vitro maturation (IVM) in eland and bongo antelopes...
April 2009: Animal Reproduction Science
K Liao, J Wagner, A Joshi, I Estrovich, M F Walker, M Strupp, R J Leigh
BACKGROUND: Patients with progressive supranuclear palsy (PSP) fall frequently, beginning early in the course of their disease. Abnormal vestibulospinal reflexes are suspected, but the angular vestibulo-ocular reflex, which is mediated by the labyrinthine semicircular canals, survives late into the course of the disease. OBJECTIVE: To test the hypothesis that otolithic-mediated reflexes are abnormal in PSP. METHODS: We tested otolith-ocular reflexes (the translational vestibulo-ocular reflex [tVOR]) during combined rotation-translation in nine patients with PSP and nine age-matched control subjects; subjects viewed far and near targets...
March 4, 2008: Neurology
Ke Liao, Mark F Walker, Anand Joshi, Millard Reschke, R John Leigh
Prior studies of the human translational vestibulo-ocular reflex (tVOR) report that eye rotations amount to less than 60% of those required to keep the eyes pointed at a stationary visual target, unlike the angular VOR (aVOR) which is optimized to maintain stable gaze. Our first goal was to determine if the performance of the tVOR improves when head translations are combined with head rotations in ambient lighting. A second goal was to measure tVOR during vertical head translations (bob), which has not received systematic study...
March 2008: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Paul Kessler, David Tomlinson, Alan Blakeman, John Rutka, Paul Ranalli, Agnes Wong
OBJECTIVE: To investigate whether transient, high-acceleration interaural head heaves (translational vestibulo-ocular reflex [tVOR]) could aid in the diagnosis of otolith diseases. STUDY DESIGN: Prospective cohort study. SETTING: Tertiary referral center. PATIENTS: Thirteen patients with symptoms suggestive of otolith diseases and 10 age-matched controls. INTERVENTIONS: Patients underwent a clinical otoneurologic examination and standard laboratory audiovestibular evaluation, including audiometry, electronystagmography with bithermal caloric, Halmagyi-Curthoys head thrust test with search coils, and vestibular-evoked myogenic potential...
October 2007: Otology & Neurotology
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