Clinical evaluation and management of pulmonary hypertension in the adult with congenital heart disease.

Abstract

Pulmonary hypertension (PH) refers to elevated pulmonary artery (PA) pressure (PAP), defined as mean PAP≥25 mm Hg. PH is not synonymous with pulmonary arterial hypertension (PAH), which specifies resistive PH characterized by elevated pulmonary vascular resistance (PVR) and normal pulmonary venous pressure. Approximately 5% to 10% of adults with congenital heart disease (CHD) have PH, and this subset of CHD patients is at higher risk of hospitalization and death.1–3 Understanding the epidemiology of PH associated with CHD (PH-CHD) is not straightforward, however, because definitions of PH-CHD and diagnostic techniques vary. Appropriate diagnosis and the management of PH-CHD rest on identifying the cause of elevated PAP: high pulmonary venous pressure, high pulmonary vascular resistance, high pulmonary flow, or some combination of these factors, which are referred to throughout this review as passive, resistive, hyperkinetic, and polygenic PH, respectively (Table 1). View this table: Table 1. Modified Wood Classification of Pulmonary Hypertension Prognosis in PH-CHD depends on the underlying cause, pulmonary vascular pathophysiology, and the interaction between the right heart and pulmonary circulation. Adult CHD is heterogeneous, with myriad permutations of underlying defects, previous interventions, and associated comorbidities. Although comprehensive understanding of clinical context is a prerequisite, identifying the optimal therapy for a patient with PH-CHD depends more heavily on an understanding of pathophysiology than it does on the underlying diagnosis. Therefore, the goal of this review is to frame an understanding of PH-CHD in terms of fundamental cardiopulmonary hemodynamic pathophysiology and to emphasize the clinical assessment and management of situations commonly encountered by adult cardiologists caring for patients with PH-CHD. Classification schemes in PH represent clinical perspectives of underlying pathophysiology and tend to parallel fundamental hemodynamic relationships of the pulmonary circulation. PVR is defined: ![Graphic][1] . Pulmonary artery occlusion pressure (PAOP) approximates pulmonary venous pressure and Qp is pulmonary blood flow. Rearranging this … [1]: /embed/inline-graphic-1.gif