Aim: To look for the frequency of oesophageal dysfunction using radionuclide oesophageal transit scintigraphy in 145 patients with undifferentiated connective tissue disease (UCTD); to seek the correlation between the clinical/laboratory data and scintigraphic alterations; and to determine predictive value of radionuclide oesophageal transit scintigraphy for evolution to established connective tissue disease (CTD).
Method: One hundred and forty-five patients with UCTD were examined by 99mTc-DTPA oesophageal transit scintigraphy. The intraoesophageal transport of the radiopharmaceutical was followed and imaged by a gamma camera, a series of 128 x 128 images were stored and evaluated. The correlation between the scintigraphic data and clinical and laboratory parameters was analysed statistically.
Results: Unequivocally positive scintigraphy, indicative of motor abnormality was found in 46% of patients (66), 71% (47) of whom were totally asymptomatic. Significant correlation was found between the presence and severity of scintigraphic alterations and antinuclear antibodies, the anti-beta2GPI, IgM, IgG, the aCL antibody positivity, and the skin symptoms. Scintigraphic positivity was significantly more frequent in patients evolving to definitive CTD (P = 0.0178), and abnormal scan predisposed to transition into the definitive CTD (odds ratio, 2.292; CI, 1.610-4.525). Its cumulative positive predictive value was found to be 43% and cumulative negative predictive value 73% with regard to the development of a definitive CTD.
Conclusion: Our results show that scintigraphic alterations together with clinical and laboratory alterations can help the clinician in the prediction of final outcome.