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Updated: Aug 25, 2026

Gastrointestinal Motility Monitor (GIMM)
Published on: December 1, 2010
The importance of gut motility in the metabolic control of propionic acidemia
Chitra Prasad1, Samuel Nurko, Jacob Borovoy
1Division of Genetics, Children's Hospital, Boston, Massachusetts, USA. Chitra.Prasad@lhsc.on.ca
Insights
Enhancing gut motility in propionic acidemia (PA) patients improved metabolic stability. The study showed that using an intestinal motility agent significantly reduced blood ammonia and improved carnitine levels in PA patients.
Area of Science:
- Biochemistry
- Gastroenterology
- Metabolic Disorders
Background:
- Propionic acidemia (PA) is a metabolic disorder.
- Gut motility's role in PA metabolic stability is not well understood.
Purpose of the Study:
- To investigate the effect of enhanced gut motility on metabolic stability in PA patients.
- To assess the impact of an intestinal motility agent on key metabolic markers in PA.
Main Methods:
- Prospective study of 4 PA patients over 7 days.
- Measurements included blood ammonia, amino acids, urine organic acids, and lactulose breath test.
- Gastrointestinal transit time assessed using radio-opaque markers with and without a motility agent (Senekot).
Main Results:
- Intestinal motility agent significantly decreased blood ammonia levels.
- Urinary propionylglycine excretion was reduced.
- The ratio of free to total carnitine increased.
Conclusions:
- Enhancing gut motility can improve metabolic stability in patients with propionic acidemia.
- Intestinal motility agents may be a beneficial adjunct therapy for PA.
Abstract:
We hypothesized that gut motility likely plays a critical role in the metabolic stability in propionic acidemia (PA). Therefore, 4 known patients with PA (aged 47 months to 185 months) were prospectively studied over 7 days in the Clinical Research Center at Children's Hospital, Boston. Determinations of ammonia, bicarbonate, and amino acids in blood; organic acids and propionylglycine in urine; and a lactulose breath test were conducted under two study conditions: on regular therapy (for 4 days) and on regular therapy plus Senekot (Purdue Frederick Company, Norwalk, Conn), an intestinal motility agent (for 3 days). The total gastrointestinal transit time was calculated using 20 nonabsorbable, inert, radio-opaque markers. The addition of an intestinal motility agent resulted in a significant decrease in blood ammonia, urinary excretion of propionylglycine, and a rise in the ratio of free to total carnitine over baseline. We concluded that enhancement of gut motility can improve metabolic stability in patients with PA.
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