Real-World Management of Patients with Pulmonary Arterial Hypertension: Insights from EXPOSURE.

INTRODUCTION: Further insights into real-world management and outcomes of patients with pulmonary arterial hypertension (PAH) are needed. This interim analysis of the ongoing, multicentre, prospective EXPOSURE (EUPAS19085) observational study describes characteristics, treatment patterns and outcomes of patients with PAH initiating a new PAH-specific therapy in Europe/Canada. METHODS AND RESULTS: All analyses were descriptive. In total, 1944 patients with follow-up information were included; the majority were female, with World Health Organization functional class II/III symptoms and with idiopathic PAH or connective tissue disease-associated PAH. Most incident patients (N = 1100; diagnosed for ≤ 6 months) initiated treatment as monotherapy (48%) or double therapy (43%). Of those initiating monotherapy, 38% (199/530) escalated to double therapy (median [Q1, Q3] time to escalation 3.4 [1.9, 6.6] months), and of those initiating double therapy, 17% (78/457) escalated to triple therapy (median [Q1, Q3] time to escalation 7.0 [3.4, 12.7] months) during the observation period (median [Q1, Q3]: 17.0 [7.5, 29.9] months). The majority of the 834 prevalent patients (diagnosed > 6 months) entered the study on initiation of combination therapy and most did not change treatment regimen during the observation period (median [Q1, Q3]: 19.6 [10.2, 32.2] months). One-year survival was 88% for incident patients and 90% for prevalent patients. CONCLUSIONS: Results from EXPOSURE suggest a shift towards combination therapy and the alignment of real-world treatment patterns with current guideline recommendations. While survival estimates are encouraging, the extent of monotherapy use at treatment initiation and follow-up highlight an opportunity for further improvements through optimisation of treatment strategies in line with current guidelines. A graphical abstract is also available with this article. TRIAL REGISTRATION NUMBER: EUPAS19085.

Pulmonary arterial hypertension (PAH) is a progressive disease. Clinical guidelines recommend that most patients start treatment with a combination of different PAH medications. While there is no cure for PAH, these medications help to control symptoms and slow disease worsening. To understand treatments currently used in clinical practice, we analysed data from EXPOSURE (EUPAS19085), an ongoing study collecting information from patients starting a new PAH medication in Europe and Canada. Most patients in the study were female, with World Health Organization functional class II/III symptoms, and idiopathic (unknown cause) PAH or PAH associated with connective tissue disorders. Among 1100 patients who were 'recently diagnosed' (diagnosed with PAH in the past 6 months), 88% were alive after 1 year. We found that 48% started treatment with one PAH medication, and 38% of those patients had a second medication prescribed within a median period of 3 months. Among the 457 'recently diagnosed' patients treated with two PAH medications when they entered the study, 17% had a third medication prescribed within a median period of 7 months. Among 834 patients with 'established PAH' (diagnosed more than 6 months ago), 90% were alive after 1 year. Most entered the study when they started a third medication and did not have further changes in treatment. Our findings show that patients with PAH are often treated with one medication in clinical practice as well as a combination of medications. While survival rates are encouraging, the extent to which one PAH medication is used suggests there is room for treatment improvement.

Four-Strata Risk Assessment in Patients with Pulmonary Arterial Hypertension Treated with Selexipag in Real-World Settings (EXPOSURE Study).

INTRODUCTION: Risk assessment can aid management of pulmonary arterial hypertension (PAH) and clinical decision-making. This analysis describes characteristics, treatment patterns and outcomes of patients with PAH, categorised by risk status at time of treatment escalation with selexipag in clinical settings. METHODS: Patients initiating selexipag in the ongoing multicentre, prospective EXPOSURE (EUPAS19085) study were grouped as low, intermediate-low, intermediate-high or high risk of 1-year mortality according to the ESC/ERS 4-strata method. RESULTS: As of November 2022, 77% (535/698) of patients initiating selexipag had data allowing for risk calculation; 14% (N = 76) were low, 31% (N = 168) intermediate-low, 34% (N = 182) intermediate-high and 20% (N = 109) high risk of 1-year mortality. Overall, patients were predominantly female (71%), with idiopathic/heritable PAH (56%) or PAH associated with connective tissue disease (CTD-PAH; 27%), median age of 60 years and prevalent (2 years) disease. From low to high risk, proportion of CTD-PAH and age increased (from 12%-40% and 46-68 years, respectively); time from diagnosis decreased and presence of cardiovascular risk factors increased. Most patients across risk groups (74-81%) initiated selexipag as part of triple oral combination therapy. Overall median (Q1, Q3) selexipag exposure duration was 10.1 (3.5, 24.1) months. Proportions of hospitalised patients increased with increasing risk group (16-42% from low to high, respectively); more hospitalisations were PAH-related for the high risk (71%) versus other risk groups (47-54%). Kaplan-Meier survival estimates were 98%, 98%, 93% and 80% at 1-year and 98%, 92%, 81% and 67% at 2-years, from low to high risk, respectively. CONCLUSIONS: In clinical settings, selexipag is initiated across all risk groups, predominantly as triple therapy. Only 45% of patients being at low/intermediate-low risk at selexipag initiation suggests an opportunity for more frequent patient monitoring and earlier treatment escalation, given that 4-strata risk assessment was prognostic for hospitalisations and survival in this contemporary PAH cohort. A graphical abstract is available with this article.

Pulmonary arterial hypertension (PAH) is a disease that gets worse over time. To make decisions about treatment, we need to know the stage of the disease. We can do this by measuring the patient's risk of death during the next few years. Selexipag is a medication for PAH. This analysis included patients living in Europe and Canada who started treatment with selexipag for their PAH disease. Our findings suggest that the monitoring of patients' health and the timing of starting selexipag can be improved. This analysis includes 698 patients taking part in the EXPOSURE study (EUPAS19085), which looks at the real-life treatment of patients with PAH. Overall, 71% of patients were female, the median age was 60 years, most had been diagnosed with PAH for around 2 years and were already taking two other medications for their PAH disease. At the beginning of selexipag treatment, 14% of patients were classified as low risk, 31% as intermediate-low risk, 34% as intermediate-high risk and 20% as high risk of mortality within the next year. More high-risk patients were hospitalised compared with the lower risk groups. After 1 year of treatment, more patients in the low (98%) and intermediate-low groups (98%) were alive than those in the intermediate-high (93%) and high risk groups (80%). The same was true after 2 years of treatment with selexipag (98%, 92%, 81% and 67%, respectively). This study confirms that assessing patients' risk levels can indicate how well they will do over time and shows that earlier treatment with selexipag should be considered to potentially prevent worsening of the disease.

Selexipag in patients with pulmonary arterial hypertension associated with connective tissue disease (PAH-CTD): Real-world experience from EXPOSURE.

Selexipag is indicated for the treatment of pulmonary arterial hypertension (PAH), including PAH associated with connective tissue disease (CTD), and further insights into the management of selexipag-treated PAH-CTD patients in clinical settings are needed. These analyses of the ongoing, multicenter, prospective EXPOSURE (EUPAS19085) study describe characteristics, treatment patterns, tolerability, and outcomes of PAH-CTD patients initiating selexipag in Europe/Canada. All analyses were descriptive, with idiopathic PAH patients who typically display better prognosis included for context. Six hundred ninety-eight selexipag-treated patients had follow-up information; 178 (26%) had PAH-CTD. The median age was 68 years, patients were predominantly female (88%), and with WHO functional class III symptoms (63%); the median time since diagnosis was 1.7 years. There were 5% patients at low, 25% intermediate-low, 40% intermediate-high, and 30% high risk of 1-year mortality, according to the ESC/ERS 4-strata risk score. Most (80%) initiated selexipag as a triple oral therapy, and most of these (62%) remained on triple therapy 6 months post-baseline. Over a median (Q1-Q3) selexipag exposure period of 8.6 (2.5-17.2) months, 79 (44%) patients discontinued selexipag; 36 (20%) due to tolerability/adverse events. Sixty (34%) patients were hospitalized at least once; 120 hospitalizations occurred, with 49 (48%) deemed PAH-related. Survival at 1 year was 85%, and at 2 years was 71%; 29 (16%) patients died. These results describe the use of combination therapy with selexipag for patients with PAH-CTD. These findings suggest an opportunity to optimize the benefits of selexipag among patients with PAH-CTD by moving from escalating after years in response to clinical deterioration to escalating sooner to prevent clinical deterioration.

The importance of data in Pulmonary Arterial Hypertension: from international registries to Machine Learning. / La importancia de los datos en la hipertensión arterial pulmonar: de los registros internacionales al machine learning.

Real-world registries have been critical to building the scientific knowledge of rare diseases, including Pulmonary Arterial Hypertension (PAH). In the past 4 decades, a considerable number of registries on this condition have allowed to improve the pathology and its subgroups definition, to advance in the understanding of its pathophysiology, to elaborate prognostic scales and to check the transferability of the results from clinical trials to clinical practice. However, in a moment where a huge amount of data from multiple sources is available, they are not always taken into account by the registries. For that reason, Machine Learning (ML) offer a unique opportunity to manage all these data and, finally, to obtain tools that may help to get an earlier diagnose, to help to deduce the prognosis and, in the end, to advance in Personalized Medicine. Thus, we present a narrative revision with the aims of, in one hand, summing up the aspects in which data extraction is important in rare diseases -focusing on the knowledge gained from PAH real-world registries- and, on the other hand, describing some of the achievements and the potential use of the ML techniques on PAH.

Simplified risk stratification based on cardiopulmonary exercise test: A Spanish two-center experience.

A simplified 4-strata risk stratification approach based on three variables is widespread in pulmonary arterial hypertension (PAH) at follow-up. This study aimed to assess the impact of replacing the 6-min walk test (6MWT) with the peak 02 uptake evaluated by the cardiopulmonary exercise test (CPET) on risk stratification by this scale. We included 180 prevalent patients with PAH from two reference hospitals in Spain, followed up between 2006 and 2022. Patients were included if all the variables of interest were available within a 3-month period on the Spanish Registry of Pulmonary Arterial Hypertension (REHAP): functional class (FC); NT-proBNP; 6MWT; and CPET. The original 4-strata model (NT-proBNP, 6MWT, FC) identified most patients at low or intermediate-low risk (36.7% and 51.1%, respectively). Notably, the modified scale (NT-proBNP, CPET, FC) improved the identification of patients at intermediate-high risk up to 18.9%, and at high risk up to 1.1% in comparison with the previous 12.2% and 0.0% in the original scale. This new model increased the number of patients correctly classified into higher-risk strata (positive NRI of 0.06), as well as classified more patients without events in lower-risk strata (negative NRI of 0.04). The proposed score showed a slightly superior prognostic capacity compared with the original model (Harrel's C-index 0.717 vs. 0.709). Using O2 uptake instead of distance walked in the 6MWT improves the identification of high-risk patients using the 4-strata scale. This change could have relevant prognostic implications and lead to changes in the specific treatment of PAH.

Seralutinib in adults with pulmonary arterial hypertension (TORREY): a randomised, double-blind, placebo-controlled phase 2 trial.

BACKGROUND: Morbidity and mortality in pulmonary arterial hypertension (PAH) remain high. Activation of platelet-derived growth factor receptor, colony stimulating factor 1 receptor, and mast or stem cell growth factor receptor kinases stimulates inflammatory, proliferative, and fibrotic pathways driving pulmonary vascular remodelling in PAH. Seralutinib, an inhaled kinase inhibitor, targets these pathways. We aimed to evaluate the efficacy and safety of seralutinib in patients with PAH receiving standard background therapy. METHODS: The TORREY trial was a phase 2, randomised, multicentre, multinational, double-blind, placebo-controlled study. Patients with PAH from 40 hospital and community sites were randomly assigned 1:1 via interactive response technologies to receive seralutinib (60 mg twice daily for 2 weeks, then increased to 90 mg twice daily as tolerated) or placebo by dry powder inhaler twice daily for 24 weeks. Randomisation was stratified by baseline pulmonary vascular resistance (PVR; <800 dyne·s/cm5 and ≥800 dyne·s/cm5). Patients were eligible if classified as WHO Group 1 PH (PAH), WHO Functional Class II or III, with a PVR of 400 dyne·s/cm5 or more, and a 6 min walk distance of between 150 m and 550 m. The primary endpoint was change in PVR from baseline to 24 weeks. Analyses for efficacy endpoints were conducted in randomly assigned patients (intention-to-treat population). Safety analyses included all patients who received the study drug. TORREY was registered with ClinicalTrials.gov (NCT04456998) and EudraCT (2019-002669-37) and is completed. FINDINGS: From Nov 12, 2020, to April 20, 2022, 151 patients were screened for eligibility, and following exclusions, 86 adults receiving PAH background therapy were randomly assigned to seralutinib (n=44; four male, 40 female) or placebo (n=42; four male, 38 female), and comprised the intention-to-treat population. At baseline, treatment groups were balanced except for a higher representation of WHO Functional Class II patients in the seralutinib group. The least squares mean change from baseline to week 24 in PVR was 21·2 dyne·s/cm5 (95% CI -37·4 to 79·8) for the placebo group and -74·9 dyne·s/cm5 (-139·7 to -10·2) for the seralutinib group. The least squares mean difference between the seralutinib and placebo groups for change in PVR was -96·1 dyne·s/cm5 (95% CI -183·5 to -8·8; p=0·03). The most common treatment-emergent adverse event in both treatment groups was cough: 16 (38%) of 42 patients in the placebo group; 19 (43%) of 44 patients in the seralutinib group. INTERPRETATION: Treatment with inhaled seralutinib significantly decreased PVR, meeting the primary endpoint of the study among patients receiving background therapy for PAH. FUNDING: Gossamer Bio.

Valoración de la capacidad de ejercicio en los pacientes con hipertensión arterial pulmonar / Assessment of exercise functional capacity in patients with pulmonary arterial hypertension

La valoración de la capacidad funcional en los pacientes con hipertensión arterial pulmonar forma parte del protocolo diagnóstico inicial y del seguimiento. El grado de intolerancia al ejercicio tiene importantes implicaciones pronósticas y en la elección de tratamiento. Clásicamente, esta valoración se ha realizado mediante la prueba de caminata de 6 minutos. La prueba de esfuerzo cardiopulmonar, ampliamente utilizada en la disfunción ventricular izquierda, se está introduciendo como nueva herramienta en la valoración funcional de los pacientes con hipertensión arterial pulmonar, sobre todo en la de aquellos con menos limitaciones funcionales. Aparte de realizar una valoración no invasiva y objetiva de la capacidad de ejercicio, describe cuáles son los mecanismos fisiopatológicos subyacentes a dicha limitación. Es capaz también de identificar a los pacientes con cortocircuito derecha-izquierda secundario a foramen oval permeable. Tiene implicaciones pronósticas y puede emplearse para analizar la respuesta al tratamiento. Sin embargo, es compleja y requiere una gran experiencia para realizarla e interpretar sus resultados. A continuación, revisaremos el comportamiento de los pacientes con hipertensión arterial pulmonar en la prueba de esfuerzo cardiopulmonar describiendo brevemente la respuesta de nuestros pacientes y comparando los resultados con la prueba de caminata de 6 minutos.

The assessment of functional capacity is part of the diagnosisand management of patients with pulmonaryarterial hypertension. Exercise capacity impairment determines prognosis and establishes which is the besttreatment option. Practicing clinicians use various exercisemodalities in pulmonary arterial hypertension: the 6-minute walk test is the one most frequently used. Cardiopulmonary exercise testing, widely used in leftventricle dysfunction, is starting to be incorporated as anew noninvasive tool for functional assessment inpulmonary hypertensive patients, especially in those withless severe disease. Apart from providing objective information about exercise limitation it can describe the pathophysiological bases of functional impairment and it identifies patients with exercise induced right-to-leftshunt due to patent foramen ovale. Cardiopulmonary exercise testing parameters predict prognosis and assessthe response to drugs. However, it is complex and requiresgreat level of experience for interpreting its results. Thisarticle describes pulmonary hypertensive patient responseto cardiopulmonary exercise testing. Finally, we will brieflyanalyze our results comparing them with 6-minute walktest.