A 45-year-old male presents with 18 months of progressive dysphagia to solids and liquids, postprandial chest pain, and nocturnal regurgitation. Barium swallow shows a mildly dilated esophagus with "bird's beak" appearance at the gastroesophageal junction. High-resolution esophageal manometry (HRM) demonstrates elevated integrated relaxation pressure (IRP) of 24 mmHg, 100% failed peristalsis, and the finding marked **B** in the diagram—panesophageal isobaric pressurization ≥30 mmHg spanning the entire esophageal body in 60% of swallows. According to the Chicago Classification v4.0, which of the following BEST describes the clinical significance of the finding marked **B** in this patient?
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