A New Modality for the Diagnosis of Bleomycin-induced Toxicity: Ultrasonography

Abstract

ObjectiveTo evaluate the role of ultrasonography (USG) in the diagnosis of bleomycin-induced pulmonary toxicity (BT). Material and methodsThe study included patients with suspected BT during treatment with bleomycin due to various oncologic diseases between June 2015 and May 2017. The patients initially underwent clinical and high-resolution computed tomography (HRCT) examinations and pulmonary function tests (PFT)-diffusing capacity of the lung for carbon monoxide (DLCO), followed by registration of USG findings—number of comet tail artifact (CTA) images by a different pulmonologist. We compared the findings from USG, HRCT, and PFT–DLCO tests between BT and non-BT groups. With the diagnosis based on clinical-radiologic and PFT–DLCO assessments taken as the gold standard, we determined the sensitivity and specificity of the USG outcomes for diagnosis of BT. ResultsThe study included a total of 30 patients. Nine patients were diagnosed as having BT according to their clinical and radiologic findings and PFT–DLCO measurements. The mean number of CTA images was 68.7±22 in patients with BT vs 28.2±9.3 in those without BT (P<.001). The difference in CTA images between the patients with and without ground glass density was statistically significant (28.3±9.5 and 64.6±24.5, respectively, P<.001). In patients with BT, there was a negative correlation between the number of CTAs and DLCO% and FVC% values (P=.004; P=.016). USG had a sensitivity of 100%, and a specificity of 95% diagnosing BT in selected patients. ConclusionIn bleomycin-induced toxicity, USG findings are correlated with HRCT and PFT–DLCO findings, with a remarkably increased number of CTAs in BT. Thoracic USG examination is a diagnostic tool with a high sensitivity and specificity for diagnosing BT.