Background: The aim of this study was to evaluate the efficiency of the clinical diagnosis of Cushing's syndrome (CS).
Methods: A retrospective study was conducted of 72 consecutive patients with CS who, from 1995 to 2002, had been referred to the endocrinology department of a University Hospital by either endocrinologists or non-endocrinologists. Symptoms, signs, and biochemical screening tests used for confirmation of the diagnosis were recorded. Symptoms that led patients to a consultation were defined as reasons for consultation and were distinguished from other symptoms identified only by the referring physician.
Results: Fifty-one patients requested a consultation for reasons related to CS, predominantly weight gain (44%) and muscle weakness (21%). In contrast, 21 patients did not request a consultation for symptoms related to CS. Assessment of physical signs demonstrated that the clinical presentation of patients was similar in both groups. However, endocrinologists referred significantly more patients who had not expressed symptoms related to CS than non-endocrinologists (38% vs. 17%, p<0.05). Appropriate screening tests (overnight 1-mg dexamethasone suppression test and/or urinary free cortisol) were used in all patients referred by endocrinologists and in 45% of patients referred by non-endocrinologists.
Conclusion: Our data show that many patients with CS do not spontaneously request a consultation for symptoms related to their condition. These patients are mostly identified by endocrinologists, who seem to have a better knowledge of physical signs and screening tests. Because endocrinologists are highly dependent upon non-endocrinologists for the recruitment of their patients, an improvement in the educational program is needed at the non-endocrinologist level. Our results may be of help in drafting the lines of this improvement by stressing the importance of the most specific physical signs and the most relevant screening tests for CS.
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