Response by Kawakami et al to Letter Regarding Article, “Novel Angiographic Classification of Each Vascular Lesion in Chronic Thromboembolic Pulmonary Hypertension Based on Selective Angiogram and Results of Balloon Pulmonary Angioplasty”
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We thank Dr Roik et al for their interest in our study regarding novel angiographic classification of chronic thromboembolic pulmonary hypertension lesions.1 They raise the issue about the usage of pressure wire, intravascular ultrasound, and optical coherence tomography in performing balloon pulmonary angioplasty (BPA). These modalities were not addressed in our article because we cannot evaluate all lesions with them. Among 1936 lesions evaluated in our study, 110 lesions could not be crossed with guidewire. None of the abovementioned modalities can evaluate these lesions because they can be used only after successful crossing of the guidewire. Because the aim of our article is to evaluate the success and complication rate of BPA according to the location and morphology of thromboembolic lesions to …