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Measurement of intraocular pressure is an integral part of a comprehensive ocular examination, especially after a surgical intervention that can affect aqueous humor flow dynamics. Most of the intraocular pressure measurement devices are designed for 'normal' corneas and may not be accurate in eyes following corneal transplantation where there is altered corneal morphology. Raised intraocular pressure and glaucoma are known post-operative complications following transplantation, and therefore accurate intra...
There is evidence that choroidal blood flow (ChBF) is regulated in a complex way during changes in ocular perfusion pressure (OPP). We hypothesized that ChBF regulates better in response to changes in mean arterial pressure (MAP) than in intraocular pressure (IOP).
Negative-pressure hydrocephalus is a rare condition with the development of symptomatic hydrocephalus despite subnormal intracranial pressure (ICP). The etiology remains unclear. Some authors proposed that the differential pressure between the ventricular space and the subarachnoid space (SAS) over cerebral convexity leads to the development of ventriculomegaly, namely as the transmantle pressure theory.
Obesity is accepted as a risk factor for postoperative visual loss due to possible perioperative elevations in intraocular pressure. This study investigated whether intraocular pressure changes differed according to the body mass index of patients undergoing laparoscopic cholecystectomy.
Intraocular gases are commonly used in vitreoretinal surgery. Patients are routinely advised against air travel before the complete absorption of intraocular gas. Consequently, reports on air travel in patients with large intraocular gas bubbles are highly unusual. Here, we report the intraocular pressure changes of a patient ascending to an altitude of 2,600 feet in a helicopter with a 50% fill perfluoropropane (C3F8) gas bubble in his left eye.
The classical problem of the electrophoretic motion of a spherical particle has been treated theoretically by Overbeek in his 1941 PhD thesis and almost 40 years later by O'Brien & White. Although both approaches used identical assumptions, the details are quite different. Overbeek solved for the pressure, velocity fields as well as the electrostatic potential, whereas O'Brien & White obtained the electrophoretic mobility without the need to consider the pressure and velocity explicitly. In this paper, we...
Early brain injury (EBI) after subarachnoid hemorrhage (SAH), which is considered a main factor leading to poor outcome, is thought to be caused by the elevation of intracranial pressure (ICP) and/or the presence of subarachnoid blood clots (SBC) itself. The purpose of this study was to examine whether ICP or SBC is more important to neurological deficit in the presence of apoptosis or edema.
To determine the effects of αvβ3 integrin expression and activation on intraocular pressure (IOP).
There is some evidence to suggest that a systemic and central nervous system (CNS) inflammatory response occurs following aneurysmal subarachnoid haemorrhage (aSAH) which may be related to the pathophysiology of early brain injury and delayed ischaemic neurological deficit (DIND). The aim of this study was to measure inflammatory mediator levels in plasma and cerebrospinal fluid (CSF) in the days following aSAH and to determine their association with aSAH, DIND and clinical outcome.
To compare the dose-response profiles of bimatoprost sustained-release implant (Bimatoprost SR) and topical bimatoprost in lowering intraocular pressure (IOP) in normotensive beagle dogs.
The basilar subarachnoid cisterns are expansions of the subarachnoid space and transmit cranial nerves and intracranial vessels. Providing neurosurgeons with key concepts, anatomical landmarks, and techniques can result in safer procedures and better patient outcomes. In this review, we discuss the major basilar subarachnoid cisterns including their embryology, history, anatomical descriptions, and use during surgical approaches.
Subtle folds can be seen in the anterior cornea in eyes with hypotony using fluorescein and blue light. We aim to assess their extent and grade with respect to the level of intraocular pressure (IOP).
To introduce and clinically validate a new method of estimating intraocular pressure (IOP) in patients with keratoconus and soft corneas with the aim of significantly reducing dependence on corneal biomechanics.
To investigate the association between long-term intranasal steroid use and intraocular pressure (IOP) elevation.
Astronauts on International Space Station missions demonstrate adverse neuro-ocular changes. Reversing a negative translaminar pressure gradient (TLPG) by modulating cerebral blood flow, decreasing intracranial pressure, or increasing intraocular pressure (IOP) has been proposed as potential intervention for spaceflight-associated neuro-ocular syndrome (SANS).
Terson syndrome is a serious complication of subarachnoid hemorrhage includes any intraocular hemorrhage and may result in blurred vision or even blindness. However, it is often overlooked clinically.
To assess the normal distribution of intraocular pressure (IOP) and its associations with ocular, medical, and socioeconomic factors in a Russian population.
To evaluate changes in the macula and peripapillary choroidal area at one year after trabeculectomy in order to determine the effect of intraocular pressure (IOP) changes.
It has been shown that patients with end-stage renal disease (ESRD) have an increased risk for changes in intraocular pressure during hemodialysis, or ocular dialysis disequilibrium which can cause pain or discomfort during treatment and lead to decreased vision over time. This is a case of an elderly male with ESRD who was having headaches, nausea, and eye pain during hemodialysis due to increased intraocular pressures. Using a higher sodium prescription resolved his symptoms and normalized his intraocular...
Measuring the intraocular pressure in eyes with corneal diseases or after corneal interventions often results in false values due to abnormal corneal biomechanics. Many different approaches are used to compensate for these abnormal corneal biomechanic properties, with varying measuring methods. There are differences when these alternative measuring methods are compared to the gold standard, applanation tonometry according to Goldmann. These differences vary between the methods and with different corneal cha...
Identifying fluid responsiveness is critical to optimizing perfusion while preventing fluid overload. An experimental study of hypovolemic shock resuscitation showed the importance of ventricular compliance and peripheral venous pressure (PVP) on fluid responsiveness. The authors tested the hypothesis that reduced ventricular compliance measured using transesophageal echocardiography results in decreased fluid responsiveness after a fluid bolus.
To analyse the dynamics of telemetrically measured intraocular pressure (IOP) during year one after implantation of a Boston Keratoprosthesis Type I (BI-KPro) and to compare agreement of telemetric IOP measurements with finger palpation.
The Corvis ST provides measurements of intraocular pressure (IOP) and a biomechanically-corrected IOP (bIOP). IOP influences corneal deflection amplitude (DA), which may affect the diagnosis of keratoconus. Compensating for IOP in DA values may improve the detection of keratoconus.
The execution of resistance exercise against heavy loads promotes an acute intraocular pressure (IOP) rise, which has detrimental effects on ocular health. However, the effect of load on the IOP behavior during exercise remains unknown due to technical limitations.