RESUMO
The treatment of pulmonary arterial hypertension (PAH) has undergone significant change in recent years, improving both quality of life and survival for patients. One of the principal new agents is sildenafil, a phosphodiesterase-V inhibitor with great PAH efficacy. Its success has led to consideration of other phosphodiesterase inhibitors not yet licensed for pediatric PAH including tadalafil and vardenafil, among others. This article summarizes the evidence base for phosphodiesterase inhibitors used to ameliorate pediatric PAH pathology and associated symptoms. It also analyzes their suitability for contemporary practice with the aim of clarifying and helping to direct regimens that produce improved patient outcomes.
Assuntos
Insuficiência Cardíaca , Hipertensão Pulmonar , Inibidores de Fosfodiesterase/uso terapêutico , Pressão Propulsora Pulmonar , Criança , Hipertensão Pulmonar Primária Familiar , Insuficiência Cardíaca/etiologia , Insuficiência Cardíaca/fisiopatologia , Insuficiência Cardíaca/prevenção & controle , Humanos , Hipertensão Pulmonar/complicações , Hipertensão Pulmonar/tratamento farmacológico , Hipertensão Pulmonar/fisiopatologia , Resultado do TratamentoRESUMO
The treatment of pulmonary hypertension (PH) secondary to bronchopulmonary dysplasia (BPD) in infants has evolved in recent years, improving both quality of life and survival for patients. One of the potential agents for this condition is sildenafil, a phosphodiesterase-V inhibitor with proven efficacy within the idiopathic PH population. However, only limited evidence exists for its use as either monotherapy or part of a combination approach towards the management of PH in BPD. This review summarises the evidence base for sildenafil alone and in combination with other recognised therapeutic agents for ameliorating paediatric PH in the presence of BPD. It also examines the suitability for current practice with the aim of clarifying regimens that produce improved patient outcomes. We conclude that sildenafil is both safe and effective in this utility. Doses should be started at 0.5 mg/kg every 8 h before titrating up towards 2 mg/kg every 6 h to effect reductions in pulmonary vascular resistance and arterial pressure. Evidence suggests that if continued until PH resolution, this improves survival from 61% to 81% at 12 months. Furthermore, there are also data suggesting that in treatment refractory PH cases, the addition of endothelin antagonists and prostacyclin analogues to sildenafil therapy can also be considered.