Chronic thromboembolic pulmonary hypertension: clinical picture and surgical treatment

Chronic, major vessel thromboembolic pulmonary hypertension (CTEPH), is an uncommon condition which, in the past, was an autopsy curiosity. Advances in diagnostic approaches, surgical techniques and postoperative management have transformed this disorder into a potentially curable form of pulmonary hypertension. The predominant symptom is unexplained dyspnoea on exertion. In patients with this complaint, CTEPH should be considered. Numerous pitfalls exist along the diagnostic path. Perfusion lung scans point toward the diagnosis, but often underestimate the extent of central arterial obstruction. Pulmonary angiography is the key diagnostic procedure, but the many patterns of thrombus organization-recanalization require a base of experience for proper interpretation. Criteria for selection of patients for surgery are evolving, but assurance of thrombus accessibility to surgery is critical. Surgical thromboendarterectomy bears no resemblance to acute pulmonary embolectomy. Recognition of thrombus (versus normal intima), meticulous dissection and a bloodless surgical field are essential for adequate restoration of pulmonary vascular patency. Multiple complications may arise postoperatively, and detailed attention to these is required for patient survival. With a co-ordinated, multi-specialty team effort, however, haemodynamic and clinical outcomes have been rewarding and persist long-term. Surgical mortality should steadily decline with such a co-ordinated effort, as well as earlier diagnosis and advances in surgical and postoperative management techniques.

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