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Puzzling persistent hyperamylasemia, probably neither pancreatic nor pathologic
1Surgical Services, Massachusetts General Hospital, Harvard Medical School, Boston 02114.
American Journal of Surgery
|March 1, 1988
Summary
Elevated serum amylase levels often suggest pancreatic issues. However, this study found that most patients with persistent high amylase, even without clear cause, have non-pancreatic origins, indicating a likely normal variant.
Area of Science:
- Biochemistry
- Clinical Diagnostics
- Internal Medicine
Background:
- Elevated serum amylase is a common indicator of pancreatic disease.
- Persistent hyperamylasemia without an obvious cause presents a diagnostic challenge.
Purpose of the Study:
- To investigate the causes of persistent hyperamylasemia in patients with no apparent clinical or radiologic findings of pancreatic disease.
- To determine the utility of amylase isoenzyme fractionation in diagnosing the cause of hyperamylasemia.
Main Methods:
- Serum amylase isoenzymes were separated using polyacrylamide gel electrophoresis.
- Fractions were quantified using a saccharogenic assay in 117 patients with unexplained hyperamylasemia.
- Clinical and radiologic evaluations were performed for all participants.
Main Results:
- A significant majority (79%) of patients exhibited non-pancreatic causes for their hyperamylasemia.
- The largest subgroup (64%) displayed a normal isoamylase distribution at elevated levels, suggesting a potential normal variant.
- Macroamylasemia (6%) and salivary hyperamylasemia (9%) were identified, with only a few cases linked to pancreatic pseudocysts.
Conclusions:
- Isoamylase fractionation is an effective, cost-efficient method to exclude pancreatic origins of hyperamylasemia.
- Persistent hyperamylasemia, in the absence of clear clinical indicators, is often benign and may represent a normal physiological variant.