Non-Invasive Monitoring of Partial Pressure of Carbon Dioxide in Mechanically Ventilated Preterm Infants

NCT ID: NCT03758313

Last Updated: 2021-08-17

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

27 participants

Study Classification

OBSERVATIONAL

Study Start Date

2018-11-01

Study Completion Date

2020-09-30

Brief Summary

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In mechanically ventilated preterm infants, the ability to monitor carbon dioxide partial pressure (pCO2) values is indispensable. The gold standard for pCO2 measurement is from an arterial blood sample (paCO2). This has two drawbacks: firstly, it requires an arterial line and, secondly, it does not provide the clinicians with a continuous measurement. At present, two alternative pCO2 monitoring systems are available in the field of neonatal intensive care medicine: end-tidal CO2 (etCO2) capnography and transcutaneous CO2 (tcCO2) measurements. Both methods have disadvantages including potential technical errors as well as pathologies that may reduce reliability as a surrogate for blood gas analysis (BGA). In particular, conventional side-stream etCO2 capnography underestimates pCO2 in presence of a tube leakage, which is a common occurrence in ventilated preterm infants where only tubes without cuff are used. Distal etCO2 (detCO2) by means of a double lumen endo-tracheal tube may solve the problem of unreliable etCO2 values in the presence of tube leakage.

The aim of this study is to compare the agreement, precision and repeatability of the distal etCO2-measurement technique described by Kugelman et al. with respect to paCO2 and tcCO2 in mechanically ventilated preterm infants. Since ventilation strategies and pCO2 limits may vary among different centers, this study helps to determine which non-invasive CO2 monitoring system (detCO2 or tcO2) is more suitable in terms of applicability and reliability in preterm infants at our neonatal intensive care units.

Detailed Description

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Background: In mechanically ventilated preterm infants, the ability to monitor carbon dioxide partial pressure (pCO2) values is indispensable. The gold standard for pCO2 measurement is from an arterial blood sample (paCO2). This has two drawbacks: firstly, it requires an arterial line and, secondly, it does not provide the clinicians with a continuous measurement. At present, two alternative pCO2 monitoring systems are available in the field of neonatal intensive care medicine: end-tidal CO2 (etCO2) capnography and transcutaneous CO2 (tcCO2) measurements. Both methods have disadvantages including potential technical errors as well as pathologies that may reduce reliability as a surrogate for blood gas analysis (BGA). In particular, conventional side-stream etCO2 capnography underestimates pCO2 in presence of a tube leakage, which is a common occurrence in ventilated preterm infants where only tubes without cuff are used. Distal etCO2 (detCO2) by means of a double lumen endo-tracheal tube may solve the problem of unreliable etCO2 values in the presence of tube leakage.

Several studies compared etCO2 and tcCO2 to paCO2, simultaneously. A comparison study of etCO2 and tcCO2 in a cohort of critically ill children did not reveal significant differences in the absence of severe pulmonary parenchymal disease. Tobias et al compared etCO2 and tcCO2 in a cohort of pediatric intensive care patients with respiratory failure and found tcCO2 measurements to be more accurate. In a cohort of ventilated newborns, tcCO2 monitoring was generally more precise than etCO2 during neonatal transport to monitor ventilation. In a more recent study restricted to a cohort of postsurgical neonates without lung disease, etCO2 underestimated paCO2 more than tcCO2 but provided greater precision over paCO2, however it was less accurate at smaller tidal volumes. These studies have in common that the adapter of the pCO2 analyzer was attached in-line and proximal to the endotracheal tube.

Aim of the study: The aim of this study is to compare the agreement, precision and repeatability of the distal etCO2-measurement technique described by Kugelman et al. with respect to paCO2 and tcCO2 in mechanically ventilated preterm infants. Since ventilation strategies and pCO2 limits may vary among different centers, this study helps to determine which non-invasive CO2 monitoring system (detCO2 or tcO2) is more suitable in terms of applicability and reliability in preterm infants at our neonatal intensive care units.

Conditions

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Preterm Infant

Study Design

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Observational Model Type

COHORT

Study Time Perspective

PROSPECTIVE

Interventions

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CO2 measurements

Distal etCO2, tcCO2 and paCO2 values will be recorded simultaneously in ventilated preterm infants. We will measure etCO2 in a distal position using a double lumen tube connected to an external side-stream capnometer.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Preterm infants with a current body weight between 1000 g and 3000 g who require intubation.
* Signed informed consent from parents or legal guardians.
* Expected to provide at least three measurements of paCO2 and detCO2.

Exclusion Criteria

* Infants with known congenital anomalies of the heart and/or lung.
* Need for high frequency oscillation.
* Parents or legal guardians deny informed consent.
Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Tobias Werther

OTHER

Sponsor Role lead

Responsible Party

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Tobias Werther

Dr.

Responsibility Role SPONSOR_INVESTIGATOR

Principal Investigators

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Tobias Werther, PhD

Role: PRINCIPAL_INVESTIGATOR

Medical University Vienna

Locations

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Department of Pediatrics, Division of Neonatology, Pediatric Intensive Care and Neuropediatrics, Medical University of Vienna

Vienna, , Austria

Site Status

Countries

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Austria

References

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Other Identifiers

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1173/2018

Identifier Type: -

Identifier Source: org_study_id

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