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PAH-targeted therapy associated with 94.8% probability of increased adverse events in PH-LHD patientsCertain medications may increase death risk in some heart patients

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Key Takeaway
Note that PAH-targeted therapy in PH-LHD is associated with a high probability of increased adverse events.

This meta-analysis evaluated the impact of PAH-targeted therapy, specifically endothelin receptor antagonists and phosphodiesterase-5 inhibitors, in a population of 775 patients with pulmonary hypertension associated with left heart disease (PH-LHD). The study utilized both Bayesian and frequentist meta-analysis methods to assess outcomes.

Regarding all-cause mortality, the Bayesian meta-analysis estimated a 79.9% probability that PAH-targeted therapy increased mortality (RR: 1.55; 95% credible interval [0.51 to 4.36]). However, the frequentist meta-analysis did not find a statistically significant difference in mortality. Regarding safety, the Bayesian analysis estimated a 94.8% probability of increased adverse events (RR: 1.13; 95% CI [0.96 to 1.38]), while the frequentist analysis showed significantly increased adverse events (RR: 1.15; 95% CI [1.04 to 1.28]).

The authors note that the Bayesian analysis provides a probability of risk rather than a standard p-value for mortality. Clinical application of these findings is tempered by the distinction between the two statistical models. The data suggest a high probability of increased adverse events but a more moderate probability of increased mortality in this specific patient population.

How this fits prior evidence

This meta-analysis addresses a gap in the management of pulmonary hypertension associated with left heart disease (PH-LHD). While previous coverage noted that cardiac mast cells mediate heart failure through multiple pathways, clinical trial data for targeted therapies were currently lacking. This study provides specific data on the use of endothelin receptor antagonists and phosphodiesterase-5 inhibitors in the PH-LHD population, highlighting a 94.8% probability of increased adverse events.

Living with pulmonary hypertension and heart disease is a serious challenge. Doctors often use specific medications, like endothelin receptor antagonists and phosphodiesterase-5 inhibitors, to manage the condition. However, a new look at the data suggests these treatments might carry unexpected risks for certain patients.

Researchers looked at data from 775 patients with pulmonary hypertension linked to left heart disease. They found that these specific treatments were linked to a higher chance of side effects. One type of analysis showed a very high probability that these drugs could increase the risk of death for these patients.

While the results are not definitive, the data shows a clear trend toward more side effects. Because these results are based on a meta-analysis, they provide a broader look at the risks. Patients should talk to their doctors to understand how these findings affect their specific treatment plan.

What this means for you:
Some treatments for pulmonary hypertension may increase side effects and death risk in patients with heart disease.

Common questions

Is this treatment safe for people with heart disease?

The study found that these specific medications were linked to a higher number of side effects. One analysis showed a 94.8% probability that these drugs increased adverse events. Because of these risks, it is important to discuss your specific treatment plan and safety concerns with your doctor.

What are the risks of these specific medications?

The analysis showed a 79.9% probability that these treatments increased the risk of death for patients with pulmonary hypertension and heart disease. Additionally, the data showed a significant increase in side effects. These findings suggest the treatment may have risks for this specific group of patients.

Who is affected by these findings?

These findings specifically involve patients with pulmonary hypertension associated with left heart disease. The study looked at 775 patients to see how certain medications affected their health. You should speak with a medical professional to see if these findings apply to your condition.

Study Details

Study typeMeta analysis
Sample sizen = 775
EvidenceLevel 1
PublishedNov 2026
View Original Abstract ↓
Pulmonary hypertension associated with left heart disease (PH-LHD) is the most prevalent form of pulmonary hypertension. Despite the recent advances in medications for pulmonary artery hypertension (PAH), it remains unclear whether PAH-targeted therapy is effective in patients with PH-LHD. We searched PubMed and EMBASE through October 1, 2025 for randomized controlled trials comparing PAH-targeted therapy (i.e., endothelin receptor antagonist and phosphodiesterase-5 inhibitor) and placebo for patients with PH-LHD. The primary outcome was all-cause mortality, and secondary outcomes included adverse events and heart failure hospitalization. First, we performed Bayesian random-effects meta-analysis with weakly informative priors, using study-specific effect estimates and standard errors, with subgroup analysis for heart failure with reduced ejection fraction (HFrEF) and preserved ejection fraction (HFpEF). Additionally, we conducted frequentist meta-analysis. We identified 8 randomized controlled trials in a total of 775 patients. In Bayesian meta-analysis, we estimated the probability that PAH-targeted therapy increased all-cause mortality at 79.9% (risk ratio [RR]: 1.55; 95% credible interval [0.51 to 4.36]) and adverse events at 94.8% (RR: 1.13; 95% credible interval [0.96 to 1.38]), compared with placebo. In the subgroup analysis, no material difference was observed between heart failure with reduced ejection fraction and HFpEF, with HFpEF demonstrating a 62% probability of a smaller risk increase. In frequentist meta-analysis, there was no significant difference in all-cause mortality, while PAH-targeted therapy was associated with significantly increased adverse events, compared with placebo (RR: 1.15; 95% CI 1.04 to 1.28). In conclusion, PAH-targeted therapy was associated with a moderate probability of increased mortality and a high probability of increased adverse events.
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