A study on Ultrasonographic Measurement of Optic Nerve Sheath Diameter for Detecting Raised Intracranial Pressure in Intensive Care Unit Patients. | [Anaesthesia, Pain and Intensive Care • 2017]

Author(s):

1. Renu Bala: Department of Anesthesiology and Critical Care, PT. B. D Sharma PGIMS, Rohtak Haryana, India

2. Arnab Banerjee: Department of Critical and Intensive Care, All India Institute of Medical Sciences (AIIMS), India

Abstract:

Introduction: Optic nerve sheath diameter (ONSD) using ocular ultrasound is increasingly used now a days as noninvasive means of detecting raised intracranial pressure. We conducted a cross-sectional, observational study to assess its validity, optimal cutof limit and inter-observer variability in our ICU patients. Methodology: The adult patients admitted to our ICU during six month interval (Jan 2014-June 2014) were enrolled for the study. The exclusion criteria were patients breathing spontaneously, presence of hyperthyroidism, optic nerve tumor, neuritis, glaucoma and orbital fracture. The patients were divided into two groups. Group I - those having increased ICP clinically or as per radiological findings. Group II - patients having no features of raised ICP. A linear probe with a frequency 13-7 MHz, SonositeTM USA, was used to measure ONSD by two blinded, experienced inveistgators. Mean of three readings was taken. The entire data was compiled and analyzed applying appropriate statiistcal tesst. Results: Total of 114 patients were enrolled and 100 completed the study; 65 in group I and 35 in group II. Mean ONSD in two groups were 0.62 ± 0.07 cm versus 0.476 ± 0.040 (p < 0.001); and 0.62 ± 0.07 versus 0.47 ± 0.042 (p < 0.001) in the right and left eye respectively. The inter-observer variability was nonsignificant, the sensitivity was 88.46%, specificity 93.54%, positive predictive value 95.83%, negative predictive value 82.85% where 5.0mm was taken as cutof limit.

Page(s): 432-437

DOI: DOI not available

Published: Journal: Anaesthesia, Pain and Intensive Care, Volume: 21, Issue: 4, Year: 2017

Keywords:

Keywords are not available for this article.

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