imprOving Adherence to Pulmonary artErial hyperteNsion Treatment With teLemedicIne and patieNt guidaNce

Inclusion Criteria: * Adults aged ≥18 years diagnosed with pulmonary arterial hypertension (PAH) (Group 1 of the WHO classification). * Stable oral PAH therapy (including endothelin receptor antagonists, phosphodiesterase-5 inhibitors, or prostacyclin pathway agents) for at least four weeks prior to enrollment. * Ability to participate in remote teleconsultations (access to a phone or internet). * Signed informed consent agreeing to study participation. Exclusion Criteria: * Severe cognitive impairment or psychiatric disorders that could affect adherence or study participation. * Inability to communicate via phone or telemedicine due to technical or personal constraints. * Concurrent participation in another interventional clinical trial that could interfere with outcomes. * Life expectancy \<6 months due to any condition unrelated to PAH. * Pregnancy or breastfeeding.