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Early Protein Supplementation on Prevention of Hyperkalemia

This study has been completed.
Information provided by (Responsible Party):
Cynthia Blanco, The University of Texas Health Science Center at San Antonio Identifier:
First received: February 8, 2006
Last updated: December 6, 2012
Last verified: December 2012
Evaluate if early protein supplementation decreases the incidence of hyperkalemia in Extremely Low Birth Weight Infants (babies less than 1,000 grams birth weight).

Condition Intervention
Behavioral: Protein supplementation

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: Double-Blind
Primary Purpose: Prevention
Official Title: The Effect of Early Protein Supplementation on Prevention of Hyperkalemia in Extremely Low Birth Weight Infants

Resource links provided by NLM:

Further study details as provided by The University of Texas Health Science Center at San Antonio:

Primary Outcome Measures:
  • Incidence of hyperkalemia in between groups

Secondary Outcome Measures:
  • Incidence of hyperglycemia, post-natal growth, neurodevelopmental outcome at 18 months

Estimated Enrollment: 62
Study Start Date: December 2002
Study Completion Date: July 2007
Primary Completion Date: September 2005 (Final data collection date for primary outcome measure)
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Detailed Description:

Randomized double blind prospective clinical trial. All infants admitted to University Hospital neonatal intensive care unit with birth weight of < 1000 grams, mmore than 24 weeks gestation and with no congenital anomalies will be enrolled in the study. This will include inborn infants and those that are transported from outlying hospitals and admitted at <12 hours of life. After informed consent, infants will be randomized to receive either standard of care nutritional management or nutritional management per study protocol with the addition of protein supplementation. Randomization will take place in the pharmacy.

Control Group: Infants enrolled in the control group will be started on intravenous fluids (IVF) on admission to the NICU with 5% Dextrose and 1500 mg calcium gluconate per 500 cc for a total fluid intake of either 120 or 150 cc/kg/day. The attending neonatologist in accordance with the infant's gestational age and maturity will make the decision regarding total fluid intake. The control group will be started at 0.5 gram/kg/d of protein ( Amynosin PF) on DOL 1 and increase by 0.5 gram/kg/day every day to a maximum of 3 grams/kg/day.

Study group: The study group will receive the same total fluid intake (120 cc/kg/day or 150 cc/kg/day) and 5% dextrose infusion with calcium gluconate and the addition of 2 grams/kg/day of protein (Aminosyn PF). The study group will receive 2 grams/kg/day of protein for 24 hours to 36 hours and will increase by 1 gram/kg/day up to a maximum of 4 grams/kg/day.

In both groups, caloric intake will start at 29-34 kcal/kg day (i.e., approximately 20-25 calories per kilogram from glucose and 9 calories per kilogram from lipids). Caloric intake will be progressively increased depending on the infant's tolerance to glucose. Protein to glucose ratio in the control group will be 250-312 and nitrogen balance ratio (including all calories) will be approximately 362-425. In the study group, protein to glucose ratio will be 64-80 and nitrogen balance ratio (including all calories) will be 93-109. The control group corresponds to the current standard of care. The study group nitrogen balance is within the limits of recent studies which show that a nitrogen balance ratio of 46-78 is appropriate for ELBW infants.

Glucose infusion rate (GIR) will be increased by attending neonatologist depending on infant's glucose tolerance. Usually GIR is started at 6 mg/kg/min and increased by 1 milligram per kilo per minute every 24 hrs. in ELBW infants. For fluctuations in glucose, adjustments in glucose infusion rate (GIR) will be via piggyback dextrose to the IVF if necessary.

Lipids will be supplied as a 20% solution and will be started by attending neonatologist according to standard of care (0.5-1 gr/kg first day of life, then increases of 0.5-1 gr/kg per day up to a maximum of 3 gr/kg day).

All infants will be started on Total Parenteral Nutrition (TPN) on DOL 1. The amino acid solution (Aminosyn PF) will be supplemented with 40 mg cysteine hydrochloride/kg/day in both groups since it is considered to be one of the essential amino acids for premature infants. Stable isotope studies have suggested improved protein retention with cysteine supplementation. 3 The amino acid solution will be added via pharmacy per study protocol. Subjects will continue to receive supplementation for the first week of life.

Initiation of feedings, TPN, fluid, and electrolyte intake will be determined by the attending neonatologist.

If the infant develops hyperkalemia (>6.5 mmol/lt), treatment will be determined by attending neonatologist based on standard of care incluiding: an increase in intravenous fluid delivery, diuretic therapy (lasix), correction of acidosis, close monitoring of ionized and total calcium levels and correction with calcium gluconate if needed, glucose and insulin infusion , kayexalate, and if refractory, exchange transfusion might be considered.

Following completion of the study, we will continue to monitor standard laboratory data, including serum and urine electrolytes. We will also monitor growth until hospital discharge. Following discharge, infants will be followed in PREMIEre clinic for neurodevelopmental outcome with Bayley testing at 6, 12, and 18 months CGA. In addition to the primary outcome reduction in incidence of hyperkalemia, our secondary outcomes of interest include the incidence of hyperglycemia, the incidence of periventricular-intraventricular hemorrhage (PIVH), renal function, growth, and neurodevelopmental outcome at 18 months corrected gestational age.


Ages Eligible for Study:   up to 12 Hours   (Child)
Sexes Eligible for Study:   All

Inclusion Criteria: ELBW infants with birth weight <1000 grams . Enrollment within the first 12 hr of life.

Exclusion Criteria: major congenital anomalies; gestational age less than 24 weeks, infants not resuscitated, death.

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Please refer to this study by its identifier: NCT00290160

United States, Texas
University Health System
San Antonio, Texas, United States, 78229
Sponsors and Collaborators
The University of Texas Health Science Center at San Antonio
Principal Investigator: Cynthia L Blanco, MD University of Texas
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Cynthia Blanco, Associate Professor, The University of Texas Health Science Center at San Antonio Identifier: NCT00290160     History of Changes
Other Study ID Numbers: 012-9000-400
Study First Received: February 8, 2006
Last Updated: December 6, 2012

Keywords provided by The University of Texas Health Science Center at San Antonio:

Additional relevant MeSH terms:
Water-Electrolyte Imbalance
Metabolic Diseases processed this record on April 28, 2017