Intra-Abdominal Hypertension in Neonatal Intensive Care Patients

Study Overview
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Brief Summary
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The observational study is designed to determine the feasibility of performing Intra-Abdominal Pressure (IAP) via bladder pressure measurements and of tracking IAP in neonates who require bladder catheterization. Correlation of IAP measurements with clinical status of the neonatal abdomen will help determine threshold values for Intra-Abdominal Hypertension (IAH) in the neonate.

Detailed Description
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An increasingly common cause of Multiple Organ Dysfunction Syndrome (MODS) is mechanical injury/ischemia caused by elevated pressures within the abdominal cavity. This phenomenon has been termed intra-abdominal hypertension (IAH) with the final pathway of multiple organ dysfunction and failure termed abdominal compartment syndrome (ACS). In the neonate, IAH is known to accompany omphalocele, gastroschisis and diaphragmatic hernia repair. IAH has also been found to cause a need for neonatal extra corporeal membrane oxygenation (ECMO) and/or a subsequent failure of ECMO treatment. While abdominal compartment syndrome is the final physiologic and clinically apparent expression of severe elevations of intra-abdominal pressure, earlier in the course of this process, significant organ dysfunction occurs at a sub-clinical level. If mild to moderately elevated abdominal pressure can be detected early, it may allow clinicians to intervene early and reverse the process, preventing progression to ACS and possibly reducing morbidity and mortality. To date no study has investigated the correlation between bladder pressure (a surrogate measure of IAP) in neonates who may or may not have ACS. Thus, the ranges of normal and elevated IAP are not determined. There is suggestion from pediatric ICU patients that the threshold for IAH in children is less than that in adults. Likewise, the threshold for IAH in neonates may be expected to be even lower, but this remains to be determined. In this study, IAP (via bladder pressure measurements) will be measured with a commercially available and FDA approved system which utilizes an electronic pressure transducer, tubing, and any bedside patient monitor with pressure measurement inputs. These types of monitors are standard in the NICU. The pressure transducer is attached to the bladder catheter via a two-way valve, allowing urine drainage in-between taking bladder pressure measurements. A small amount of sterile saline is infused into the bladder in order to make the IAP measurement. While there is an indwelling urinary catheter, bladder pressure measurements will be taken every 2-4 hours.

Official Title
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Intra-Abdominal Hypertension in Neonatal Intensive Care Patients

Conditions
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Intra-Abdominal Hypertension

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Any NICU patient is eligible for enrollment in this study if his/her medical condition has required the placement of a bladder catheter for urine drainage and who does not meet any of the following Exclusion Criteria. Exclusion Criteria: Bladder trauma History of recent bladder surgery Neurogenic bladder

Ages Eligible for Study
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Maximum Age: 2 Months

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Intra-abdominal Pressure(IAP) Measurements in NICU Patients. | Intra-abdominal Pressure (IAP) measurements were taken using an electronic pressure transducer via an indwelling urinary catheter. Measurements were obtained every 2-4 hours while the urinary catheter remained in place. This will be used to determine feasability of using a urinary catheter and electronic pressure transducer system to determine IAP. A total of 1219 measurements were obtained from 30 subjects. | 3 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Median Bladder Pressure for All Measurements | Intra-abdominal Pressure (IAP) measurements will be tabulated and frequency distributions determined for patients with and without any clinical/surgical abdominal pathology. Median and quartile values will be assessed in order to describe normative values. In patients with clinical abdominal pathology (abdominal distention, necrotizing enterocolitis, abdominal wall defects, diaphragmatic hernia, etc), sequential evaluation of IAP will be done to try to identify thresholds for Intra-abdominal Hypertension (IAH). | 3 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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IAP measurements, Abdominal compartment syndrome, NICU patients, Intra-abdominal Hypertension