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How steep positions affect the size of pupil in healthy adults

Comparison of alteration in Neurological pupil index (NPi) during exposure to 25° and 45° steep trendelenburg position in healthy human volunteers:A randomised parallel group observational study - Nil

Status
Active, not recruiting
Phases
Phase 4
Study type
Interventional
Source
CTRI
Registry ID
CTRI/2024/09/074261
Enrollment
120
Registered
2024-09-24
Start date
Unknown
Completion date
Unknown
Last updated
2024-10-14

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Interventions

Intervention1: Volunteer will be subjected to trendelenburg 45 degree: NPi will be measured at baseline and after subjecting the volunteer to trendelenburg position 45 degree and after bringing back t

Sponsors

Sanjay Gandhi Post Graduate Institute of Medical Sciences
Lead Sponsor

Eligibility

Inclusion criteria

Inclusion criteria: Adult healthy volunteer who consent to participate in the study

Exclusion criteria

Exclusion criteria: Volunteer Refusal BMI more 25 KG per M2 Any eye disorder or history of glaucoma Any cardiac, pulmonary, hepatic or renal disease Bradycardia defined as less than 45 beats per minute Hypotension defined as SBP less than 90 mm Hg Hypertension defined as SBP more than 140 mm Hg IVC diameter less than 1.5 cm and more than 2 cm Positive Pregnancy test Any known case of intracranial pathology like Tumour/vascular or infective pathology History of stroke Ischemic/ haemorragic Any recent use of eye drop affecting the pupillary size Active case of myasthenia graves or similar neurological abnormalities Horner syndrome.

Design outcomes

Primary

MeasureTime frame
The primary aim of the study will be to evaluate and compare the changes in NPi after 30 minutes of subjecting one group of volunteer from supine to 25 degree and another group from supine to 45 degree trendelenburg positionTimepoint: NPi will be measured at baseline after that at 30 minutes and after 30 minutes of bringing to the neutral position. That is at TO(BASELINE)-T1(AT 30 MINUTES)-T2 (AT 60 MINUTES FROM BASELINE)

Secondary

MeasureTime frame
1.Observation of any symptoms like headache, diplopia, nausea and vomiting, any transient neurological sign or symptoms. 2.Facial swelling or corneal oedema, change of voice, during the procedure till 24 hours.Timepoint: Baseline to 24 hours

Countries

India

Contacts

Public ContactPrateek Singh

Sanjay Gandhi Post Graduate Institute of Medical Sciences Lucknow

prateeksiingh@gmail.com7007017131

Outcome results

None listed

Source: CTRI (via WHO ICTRP) · Data processed: Feb 4, 2026