Evaluation of Feeding Intolerance in Premature Infants Using Near Infrared Spectroscopy (NIRS/NICU2)

August 26, 2015 updated by: Ricardo Castillo-Galvan, MD, Brigham and Women's Hospital

Nowadays feeding intolerance (FI) is a common condition among preterm infants. It has been estimated that 16%-29% of premature infants admitted to neonatal intensive care units (NICUs) develop feeding intolerance at some point during their length of stay. The most frequent signs of FI are the presence of abdominal distension, abundant and/or bilious gastric residuals and vomiting suggesting an inability of the infant to further tolerate enteral nutrition, it increases with decreasing in gestational age (GA) and birth weight (BW). FI represents one of the most uncontrollable variables in the early nutritional management of these infants, and may lead to suboptimal nutrition, delayed attainment of full enteral feeding and prolonged parenteral nutrition supply.

NIRS has been used in preterm infants to evaluate changes in cerebral perfusion and oxygenation. It provides real time insight into the oxygen delivery, presented as regional oxygen saturation rSO2 with lower values than SpO2 distal pulse-oximetry where is mostly measured as arterialized capillary bed (around 55% vs 98% Oxygen saturation in regional NIRS vs conventional pulse-oximetry). Light easily penetrates the thin tissues of the neonate through bone and soft tissue, particularly the thin capillary bed of the tissues; NIRS provides non-invasive, continuous information on tissue perfusion and oxygen dynamics.

This technique uses principles of optical spectrophotometry that make use of the fact that biological material, including the skull, is relatively transparent in the NIR range.

Dave et al. evaluated the abdominal tissue oxygenation with NIRS, and showed that preterm infants change their cerebral - splanchnic oxygenation ratios during feedings, mainly because an increasing in the splanchnic oxygenation.

Gay et al. performed abdominal NIRS in premature piglets showing association of perfusion/oxygen changes with NEC spectrum.

The investigators would like to evaluate the association between feeding intolerance and unchanged splanchnic regional saturation and variation in the cerebral splanchnic ratio.

Innovation:

FI diagnosis follows a subjective approach, where the clinician is worried in further risk of develop Necrotizing enterocolitis (NEC). This non-studied relationship (FI and NEC) lower the threshold for the diagnosis of FI. Furthermore, infants with FI diagnosis commonly are subject of stop or slow the progression of feedings, increasing the risk of intestinal villi atrophy, and increase the length of parenteral nutrition support, and also the length of stay in the NICU settings. If NIRS technology help the clinicians to detect true abnormalities objectively as a new monitor assessing adequate feeds progress decreasing failure to feed, and therefore diminishing the need for parenteral feeds and further complication associated with it.

Study Overview

Status

Unknown

Conditions

Detailed Description

Approach Basic study design The study design is a matched-pair case-control cohort, longitudinal.

Study population and assembly of patients Premature infants from 32 to 36 6/7 weeks of postmenstrual age, with feeding tolerance at least of 50ml/kg/day, inpatients at the Brigham and Women's NICU.

Inclusion criteria:

  • Premature infants from 32 to 36 6/7 weeks of postmenstrual age, with feeding tolerance at least of 50ml/kg/day which have been diagnosed with food intolerance.
  • Control group will be composed with patients from the same population age range tolerating at least 50 ml/Kg/day (Half of the minimum full feeds daily requirement) of Human milk of enteral Formula delivered in bolus, 6 to 8 times per day.
  • Written informed consent from parent(s) or guardian.

Exclusion criteria:

  • Premature infants with know conditions that could affect the attachment of the sensors in the body areas as Gastroschisis, Omphalocele, Post surgical intestine resection, on peritoneal dialysis, with lacerations in the abdomen and frontal area of the head.
  • Infants who have been diagnosed with Necrotizing enterocolitis.
  • Infants with current diagnosis of Sepsis and/or Systemic Inflammatory Response Syndrome (SIRS).
  • Infants with severe Intra-Ventricular Hemorrhage (Intra-cranial Hemorrhage).
  • Infants with Hereditary Spherocytosis, total or partial (hypoplasia) congenital asplenia hypoplasia.

Exposures and their measurement The investigators will use two NIRS devices, the INVOS™ 5100c Cerebral/Somatic Oximeter is a 2 wavelength, diffuse reflectance spectroscopy system employing near infrared light to estimate the percentage of hemoglobin saturated with oxygen in tissue underneath the sensor. An adhesive sensor containing a light source and 2 photodiodes is applied to the skin over the tissue of interest and the returning light is analyzed for oxyhemoglobin and deoxyhemoglobin light absorption. Absorption signals from the photodiode closer to the light source are subtracted from those from the farther photodiode where the returning photons penetrate more deeply in the tissue. This suppresses absorption events originating in the outer layers of tissue that are common to both photodiodes, including the effects of skin pigmentation and subcutaneous tissues. This method of "spatial resolution" also allows estimation of scattering to improve measurement accuracy.

This is a non-invasive device Food and Drug Administration (FDA) approved (FDA 510k #K082327), with an intended use for infants with a weight greater than 2.5 Kg. Given that the target population of this study has weights under the description to use, and being used in cerebral oxygen monitoring, in order to be approved by the Institutional Board Review (IRB) committee. The investigators will catalogue it as non-significant risk device under the Investigational Device Exemption (IDE), 21 CFR 812.

The device has four channels where the light sensors will retrieve the lectures from the splanchnic (left flank), mesenteric (infra-umbilical), muscular (either right or left thigh) and cerebral (forehead) areas. The NIRS sensors Cerebral (IS-C) and Somatic (IS-S) Infant/Neonatal Somatic OxyAlert® will be attached directly to the infant skin in order to obtain the area lecture.

The cases will be diagnosed as feeding intolerant for the attending physician staff and those patients that have been at least with 50ml/Kg/day in their enteral feedings will be approached.

Once the case is attached with the NIRS device, the selection of the matching control will take place, a feeds tolerating infant (at least 50 mL/Kg/day) sharing gestational range age and gender if possible. for The study coordinators will obtain the consent from the parent(s); those families will have the opportunity to speak with the Physician investigator (PI). All the staff members are certified in the CITI program (Collaborative IRB Training Initiative) to ensure and discuss the protocol with the infant's parent(s) or guardian. After the sensors have been attached the data will be recorded the display of the monitor will be turned off, the data will be extracted and analyzed.

Confounders and their measurement The study design will allow to minimize the confounders with restriction (inclusion and exclusion criteria), same at risk population, and matching the cases.

Low perfusion status need to be assessed monitoring vital signs (HR,RR,BP) and pulse-oximetry (SpO2).

Outcomes and their measurement Clinical outcome data will be correlated with tissue oxygen saturation (TOI) from the NIRS device, other outcomes variables include: length of NICU stay, morbidity, mortality, feeding tolerance, advance in the feedings and abdominal sign of intolerance, abdominal distension, gastric residues greater than 50% of the intermittent bolus. Other variables will be recorded, infant perinatal history, level of oxygen requirements, ventilatory support status, morbidities associated, laboratory studies, vital signs and parenteral nutrition status. oxygen saturation by standard pulse oximetry, formula and/or human milk feeding status, and follow them until their discharge from the Hospital, looking for length of stay, development of Necrotizing enterocolitis, and/or Broncho-pulmonary dysplasia. The data will be extracted from their clinical records (EPIC System).

Study Type

Observational

Enrollment (Anticipated)

20

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

1 day to 4 weeks (Child)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Premature infants from 32 weeks to 36 weeks 6 days of post menstrual age.

Description

Inclusion Criteria:

  • Premature infants from 32 to 36 6/7 weeks of postmenstrual age, with feeding tolerance at least of 50ml/kg/day which have been diagnosed with food intolerance.
  • Control group will be composed with patients from the same population age range tolerating at least 50 ml/Kg/day (Half of the minimum full feeds daily requirement) of Human milk of enteral Formula delivered in bolus, 6 to 8 times per day.
  • Written informed consent from parent(s) or guardian.

Exclusion Criteria:

  • Premature infants with know conditions that could affect the attachment of the sensors in the body areas as Gastroschisis, Omphalocele, Post surgical intestine resection, on peritoneal dialysis, with lacerations in the abdomen and frontal area of the head.
  • Infants who have been diagnosed with Necrotizing enterocolitis.
  • Infants with current diagnosis of Sepsis and/or Systemic Inflammatory Response Syndrome (SIRS).
  • Infants with severe Intra-Ventricular Hemorrhage (Intra-cranial Hemorrhage). Infants with Hereditary Spherocytosis, total or partial (hypoplasia) congenital asplenia hypoplasia.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Case-Control
  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort
Feeding Intolerant Preterm Infants
32 weeks to 36 weeks 6 days old of post menstrual age infants, feeding intolerants monitored with INVOS device for rSO2
Feeding Tolerant Preterm Infants (Controls)
32 weeks to 36 weeks 6 days old of post menstrual age infants without problems through the enteral feedings.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Low abdominal (Splanchnic) tissue oxygenation (less than 0.50 Oxygen saturation).
Time Frame: 3 days
There is not an specific threshold of regional oxygen saturation measured through NIRS, the investigators want to evaluate the range of saturation as follows: 1. Greater than 0.60; 2. .50 to .60 and less than 0.50 Oxygen saturation, reading above expected, expected, below expected respectively.
3 days

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Cerebral Splanchnic Ratio (CSOR) < 0.75
Time Frame: 3 days
NIRS Cerebral Oxygenation and Splanchnic Oxygenation help to obtain an index where 0.75 to 0.95 could be considering adequate and below 0.75 considered abnormal. Area under the ROC curve is needed.
3 days

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Brigham and Women's Hospital

Publications and helpful links

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General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

November 1, 2015

Primary Completion (Anticipated)

February 1, 2016

Study Completion (Anticipated)

March 1, 2016

Study Registration Dates

First Submitted

August 23, 2015

First Submitted That Met QC Criteria

August 26, 2015

First Posted (Estimate)

August 27, 2015

Study Record Updates

Last Update Posted (Estimate)

August 27, 2015

Last Update Submitted That Met QC Criteria

August 26, 2015

Last Verified

August 1, 2015

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2015P001806

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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