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Active clinical trials for "Mydriasis"

Results 31-38 of 38

Pupil Dilation and Analgesia Nociception Index

Pain

Pain assessment is crucial in clinical practice. Currently, subjective self-report is considered the most appropriate method to evaluate pain. Although several methods to assess pain objectively exist, the lack of a golden standard still remains. This pilot study assesses the changes in pupil dilation (PD) and the analgesia nociception index (ANI) as a measure of pain in healthy, conscious, male volunteers in a highly standardized and individualized environment. Nineteen subjects received three blocks of 4 individualized electrical stimulus intensities, ranging from no to severe pain. Subjects reported their perceived severity of each individual stimulus, enabling the comparison of changes in PD and ANI in relation to both administered stimulus intensities and perceived pain severities. PD and ANI were measured before and after each administration of a stimulus.

Completed9 enrollment criteria

Evaluation of the Pupil Dilation Reflex in Response to Noxious Stimulation in Anaesthetized Children....

PainMonitoring1 more

After conduction a pilot study, pupillary dilation reflex (PDR) is measured in response to nociceptive stimulation perioperatively in infants, children and adolescents.

Completed9 enrollment criteria

Pupillary Dilation Reflex (PDR) Evaluation During General Anesthesia

Pain

In this study, the pupillary dilation reflex is measured as a nociceptive indicator during elective abdominal surgery under general anesthesia.

Completed8 enrollment criteria

The Use of Nociception Flexion Reflex and Pupillary Dilatation Reflex in ICU Patients.

Critical Illness

The aim of the study was to describe the feasibility of the nociception flexion reflex and the pupillary dilatation reflex as objective pain assessment tools in the Intensive Care Unit (ICU). Furthermore to describe the relationship between the responses and the standard of care pain evaluation in the critically ill sedated patients. Patients were under propofol / remifentanil or propofol / sufentanil sedation protocol during measurements in a stair-case increasing intensity model of standardized stimulations. (Stimulation intensity are similar to the stimulations of neuromuscular blocking agents monitoring.)

Completed10 enrollment criteria

Pain Assessment by Pupil Dilation Reflex (PDR) and Pupillary Pain Index (PPI) in Response to Noxious...

Nociceptive PainMonitoring1 more

After conduction a pilot study, pupillary dilation reflex (PDR) is measured in response to nociceptive stimulation perioperatively.

Completed9 enrollment criteria

The Effects of Mydriatic Eye Drops in Retinopathy of Prematurity Examinations

Retinopathy of PrematurityMydriasis2 more

Retinopathy of prematurity (ROP) is a retinal disorder of preterm neonates and a potential cause of blindness. As early diagnosis and treatment preserve vision, very low birth weight infants must be screened for ROP. Mydriatic eye drop administration is essential to perform funduscopic evaluations. The most commonly used mydriatic drops for pupil dilatation are 0.5-1.0% tropicamide and/or 0.5-1.0% phenylephrine or 0.2-1.0% cyclopentolate. Phenylephrine, an alpha-1 sympathomimetic agonist, is readily absorbed from conjunctival mucosa and has a potent systemic vasopressor effect. Tropicamide causes cycloplegia by inhibition of ciliary muscle contraction and has a short acting para-sympatholytic effect. Systemic absorption of mydriatic eye drops has been associated with cardiovascular, respiratory and gastrointestinal adverse effects. Systemic side effects include apnea, desaturation, increased heart rate and blood pressure, delayed gastric emptying, and feeding intolerance. The data about the effects of mydriatics on cerebral blood flow and tissue oxygenation are sparse. Cerebral blood flow autoregulation depends in part on the adrenergic and cholinergic control of cerebral vasculature, but whether mydriatics have an effect on cerebral haemodynamics is unknown. Near-infrared spectroscopy and Doppler ultrasonography (US) are non-invasive methods commonly used for neuromonitorization in NICUs. The regional blood flow changes measured using Doppler US have been reported to be associated with cerebral oxygenation and indicate a high correlation with NIRS in newborns. The aim of this study was to evaluate the effects of mydriatic eye drops on cerebral oxygenation and blood flow in preterm infants by NIRS and Doppler US.

Completed9 enrollment criteria

Evaluation of the FIM - a Non Invasive Device for Temporarily and Quick Pupil Dilation (Mydriasis)...

Pupil Dilation

The objective of this clinical trial is to evaluate the FIM optimal configuration and confirm the safety and performance/efficacy of the FIM when exposed to a larger and more varied population of users.

Unknown status12 enrollment criteria

Subconjunctival Atropine and Intracameral Epinephrine for Pupil Dilation in Phacoemulsification...

CataractMydriasis1 more

Mydriatic eye drops are routinely used before phacoemulsification but they are not free of drawbacks. Several alternatives were tried to overcome their limitations.

Unknown status10 enrollment criteria
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