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Graefe's Archive for Clinical and Experimental Ophthalmology

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01-03-2020 | Glaucoma | Glaucoma

The effect of colonoscopy on intraocular pressure: an observational prospective study

Authors: Ilan Kent, Noa Geffen, Assaf Stein, Yaron Rudnicki, Asaf Friehmann, Shmuel Avital

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 3/2020

Abstract

Purpose

Colonoscopy is an endoscopic examination of the bowel. It requires insufflation of the large bowel lumen with gas which leads to intraabdominal hypertension (IAH). There is evidence suggesting that IAH positively correlates with intracranial pressure (ICP) and possibly with intraocular pressure (IOP). The aim of this study was to examine the effect of routine screening colonoscopy performed under sedation on the IOP in healthy individuals.

Patients and methods

This was a prospective, single site, observational study. Healthy adults undergoing routine colonoscopy performed under sedation including propofol, fentanyl, and midazolam were recruited. Right eye IOP measurements were performed using Tonopen XL® in a left decubitus position at 5 time points during the procedure. Statistical analysis was performed using Student’s t-test for paired samples.

Results

Twenty-three Caucasians were recruited. There are 14 males (60%) with a mean age of 60.4 ± 10.4 years (range 36–74). Colonoscopy was conducted under sedation and completed in 22 subjects. Mean baseline IOP was 19.9 ± 4.7 mmHg, 15.8 ± 4.8 mmHg immediately after sedation, 13.5 ± 2.3 mmHg when the colonoscope had reached the cecum, 15.4 ± 5.0 mmHg 5 min after colonoscopy beginning, and 16.5 ± 5.5 mmHg when located in the rectum. The IOP reduction during the procedure was statistically significant (P < 0.01).

Conclusion

Routine colonoscopy performed under sedation using propofol, fentanyl, and midazolam does not increase the IOP in healthy adults.

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Title: The effect of colonoscopy on intraocular pressure: an observational prospective study
Authors: Ilan Kent
Noa Geffen
Assaf Stein
Yaron Rudnicki
Asaf Friehmann
Shmuel Avital
Publication date: 01-03-2020
Publisher: Springer Berlin Heidelberg
Keywords: Glaucoma
Intracranial Hypertension
Fentanyl
Colonoscopy
Propofol
Midazolam
Published in: Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 3/2020
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-019-04542-5

At a glance: The STEP trials

Springer Medicine

The effect of colonoscopy on intraocular pressure: an observational prospective study

Abstract

Purpose

Patients and methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Patients and methods

Results

Conclusion

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