The Effect of End-tidal Carbon Dioxide Level on the Optic Nerve Sheath Diameter in Pediatric Patients
Study Details
Study Description
Brief Summary
Because the optic nerve is surrounded by the cerebrospinal fluid, increase / decrease in the intracranial pressure can be examined by an increase / decrease in the optic nerve sheath diameter (ONSD). Non-invasive trans-orbital ultrasonography has been used to measure the ONSD and shown to be useful in differentiating patients with increased intracranial pressure (> 20 cmH2O).
Arterial carbon dioxide partial pressure (PaCO2) is closely related to cerebral blood flow. According to the textbook, an increase in PaCO2 in the range of PaCO2 = 25 mmHg to PaCO2 = 75 mmHg can cause a change in intracranial pressure by proportionally increasing cerebral blood flow. Because end-tidal CO2 partial pressure (ETCO2) reflects PaCO2, a significant correlation may be expected between the ETCO2 and the ONSD.
Previous studies in adult patients showed that ONSD was sensitively increased / decreased according to short-term hypercapnia (ETCO2 = 50mmHg) or hypocapnia (ETCO2 = 30mmHg) for 10 minutes and normalized at normal ETCO2 (40mmHg). Therefore, the reactivity of the ONSD according to the change of the ETCO2 was confirmed in adult patients.
In normal pediatric patients, ONSD is expected to respond to changes in ETCO2. However, no previous study has confirmed this. In addition, the reactivity of ONSD was not studied in neonates and infants with open fontanelle.
In this study, the investigators will performed trans-orbital ultrasonography in pediatric patients with normal intracranial intracranial pressure aged 18 years or younger scheduled for surgery under general anesthesia. The ONSD will be measured at three ETCO2 levels; 35mmHg, 40mmHg, and 45mmHg.
| Condition or Disease | Intervention/Treatment | Phase |
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Detailed Description
Induction of general anesthesia and endotracheal intubation will be performed with standard electrocardiography, non-invasive blood pressure, heart rate, pulse oximetry, and ETCO2 monitoring.
The ONSD will be measured at three different ETCO2 levels (35mmHg, 40mmHg, and 45mmHg). Each ETCO2 levels will be maintained within +-2mmHg for 3 minutes.
A high frequency linear probe will be used to get the images of optic nerve sheath and the diameter (ONSD) will be measured at 3 mm from the papillary segment in the transverse plane. Mean arterial pressure and heart rate will be recorded during ONSD measurements. The open or closure of Fontanelle will be examined after ONSD measurements.
The ONSD and OND measurements will be performed by two independent researchers who do not participate in ultrasound examination using stored images.
Study Design
Outcome Measures
Primary Outcome Measures
- Optic nerve sheath diameter [1 weeks]
Optic nerve sheath diameter (ONSD) measured at three ETCO2 levels(35mmHg, 40mmHg, and 45mmHg) by transorbital ultrasonography
Secondary Outcome Measures
- Mean arterial pressure [1 weeks]
Mean arterial pressure during ONSD measurements
- Heart rate [1 weeks]
Heart rate during ONSD measurements
- Eyeball diameter [1 weeks]
Eyeball diameter by transorbital ultrasonography
- Open Fontanelle [1 weeks]
Open of the Fontanelle by palpation
- Age [1 weeks]
Age
- Sex [1 weeks]
Sex
- Weight [1 weeks]
Weight
- Height [1 weeks]
Height
- BMI [1 weeks]
BMI
Eligibility Criteria
Criteria
Inclusion Criteria:
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Children under 18 years of age who are under general anesthesia
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Mechanical ventilation by endotracheal intubation
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Supine position during surgery
Exclusion Criteria:
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Disease including eyeball or orbit
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Infection or trauma around the eyes
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Difficult to access the eyes during surgery (Ophthalmologic surgery, neurosurgery, otorhinolaryngology surgery, etc.)
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Patients with abnormal intracranial pressure abnormality (trauma, brain tumors, hydrocephalus, intracranial pressure control shunt, craniosynostosis..)
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Laparoscopic surgery, Thoracoscopic surgery
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Cerebrovascular disease such as Moyamoya disease
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Hypotension
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Atelectasis, pneumothorax, pleural effusion, pneumonia, wheezing or crackle before surgery
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History of adverse reaction to ultrasound gel or Tegaderm (3M Canada, London, Ont., Canada) for eyeball protection
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | Seoul National University Hospital | Seoul | Korea, Republic of | 03080 |
Sponsors and Collaborators
- Seoul National University Hospital
Investigators
- Principal Investigator: Jin-Tae Kim, MD.PhD., Professor
Study Documents (Full-Text)
None provided.More Information
Publications
- Dinsmore M, Han JS, Fisher JA, Chan VW, Venkatraghavan L. Effects of acute controlled changes in end-tidal carbon dioxide on the diameter of the optic nerve sheath: a transorbital ultrasonographic study in healthy volunteers. Anaesthesia. 2017 May;72(5):618-623. doi: 10.1111/anae.13784. Epub 2017 Feb 8.
- Le A, Hoehn ME, Smith ME, Spentzas T, Schlappy D, Pershad J. Bedside sonographic measurement of optic nerve sheath diameter as a predictor of increased intracranial pressure in children. Ann Emerg Med. 2009 Jun;53(6):785-91. doi: 10.1016/j.annemergmed.2008.11.025. Epub 2009 Jan 23.
- Wang LJ, Chen LM, Chen Y, Bao LY, Zheng NN, Wang YZ, Xing YQ. Ultrasonography Assessments of Optic Nerve Sheath Diameter as a Noninvasive and Dynamic Method of Detecting Changes in Intracranial Pressure. JAMA Ophthalmol. 2018 Mar 1;136(3):250-256. doi: 10.1001/jamaophthalmol.2017.6560.
- H-1904-053-1027