When would be your threshold to consider obtaining an exercise RHC for undifferentiated dyspnea to help diagnose HFpEF?  

When to Consider Exercise Right Heart Catheterization (RHC) for Diagnosing HFpEF in Patients with Undifferentiated Dyspnea: Persistent, Unexplained Dyspnea: Clinical Context: Exercise RHC is indicated in patients with persistent dyspnea not explained by common conditions such as chronic obstru...