In a patient with heart failure with preserved ejection fraction (HFpEF) exacerbation and a right ventricular systolic pressure (RVSP) of 70 mmHg, when is the optimal time to perform right‑heart catheterisation?

Right Heart Catheterization Timing in HFpEF with Elevated RVSP

In a patient with HFpEF exacerbation and RVSP of 70 mmHg, right heart catheterization should be performed once initial stabilization is achieved but before discharge, particularly if there is diagnostic uncertainty about volume status, persistent symptoms despite initial therapy, worsening renal function, or need to distinguish between pulmonary arterial hypertension and HFpEF-related pulmonary hypertension.

Clinical Context and Indications

Your patient presents a complex scenario where an RVSP of 70 mmHg suggests significant pulmonary hypertension that could be:

• Post-capillary (from elevated left-sided filling pressures in HFpEF)
• Combined pre- and post-capillary
• Potentially misclassified pulmonary arterial hypertension

When RHC is Indicated During Acute HFpEF Hospitalization

Primary indications for RHC in your patient 1, 2:

1. Persistent symptoms despite empiric therapy adjustment - If dyspnea and congestion don't improve with standard diuretics and vasodilators
2. Uncertain fluid status - When clinical assessment cannot determine if filling pressures are adequate, excessive, or insufficient
3. Worsening renal function during therapy - To distinguish true hypoperfusion from adequate decongestion 3
4. Disproportionate pulmonary hypertension - RVSP of 70 mmHg is substantially elevated and warrants hemodynamic confirmation 4, 1
5. Need for diagnostic clarity - To differentiate HFpEF-related PH from pulmonary arterial hypertension, which have vastly different treatments 5

Optimal Timing Strategy

After initial stabilization but before discharge 1, 2:

• Wait until acute respiratory distress is controlled
• Ensure patient is off intravenous inotropes if possible
• Perform while still hospitalized to guide therapy optimization
• Do NOT wait for complete decongestion if diagnostic uncertainty exists

Key principle: The 2013 ACC/AHA guidelines explicitly state RHC is useful for "carefully selected patients with acute HF who have persistent symptoms despite empiric adjustment of standard therapies" 1. Your patient with RVSP 70 mmHg and acute decompensation fits this profile.

Critical Diagnostic Considerations

Why This Patient Needs RHC

An RVSP of 70 mmHg creates diagnostic ambiguity 5, 6:

• Pulmonary capillary wedge pressure (PCWP) measurement is essential to distinguish:
  • Isolated post-capillary PH (PCWP >15 mmHg, PVR <3 WU) - typical HFpEF
  • Combined pre- and post-capillary PH (PCWP >15 mmHg, PVR ≥3 WU) - more severe HFpEF
  • Pre-capillary PAH (PCWP ≤15 mmHg, PVR >3 WU) - requires PAH-specific therapy

Critical pitfall: PCWP may be falsely normal after aggressive diuresis in HFpEF patients 5. If PCWP is borderline (13-18 mmHg) and clinical suspicion for HFpEF remains high, consider fluid challenge (500 mL saline) during catheterization - PCWP >18 mmHg post-challenge confirms occult HFpEF 5.

Hemodynamic Parameters to Assess

During RHC, measure 1, 6:

• Right atrial pressure (assess RV dysfunction severity)
• RV systolic and end-diastolic pressures
• Mean pulmonary artery pressure
• PCWP (gold standard for left-sided filling pressures)
• Cardiac output/index
• Calculate pulmonary vascular resistance
• Perform saturation run if shunt suspected 7

Contraindications to Delaying RHC

Do NOT delay catheterization if 1, 3:

• Patient requires escalating vasopressor therapy
• Clinical evidence of cardiogenic shock
• Persistent severe symptoms despite 48-72 hours of optimized medical therapy
• Consideration for advanced therapies (mechanical support, transplant evaluation)

Routine RHC is NOT recommended 1: In normotensive patients who respond symptomatically to diuretics and vasodilators with clear clinical improvement.

Practical Algorithm

Step 1: Initial stabilization (first 24-48 hours)

• Oxygen, diuretics, consider vasodilators if hypertensive
• Monitor clinical response, renal function, symptoms

Step 2: Assess at 48-72 hours

• If clear improvement and diagnostic certainty → continue medical optimization, no RHC needed
• If persistent symptoms, uncertain volume status, or worsening renal function → proceed with RHC

Step 3: Perform RHC before discharge

• Obtain complete hemodynamic profile
• Consider fluid challenge if PCWP borderline
• Use results to guide long-term therapy and prognosis

Step 4: Post-RHC management

• If confirmed HFpEF with elevated PCWP → optimize GDMT (SGLT2i, MRA, diuretics) 2, 8
• If PAH component (elevated PVR) → consider pulmonary hypertension specialist referral 9
• If RV dysfunction prominent → closer monitoring, consider advanced HF referral 10, 11

Common Pitfalls to Avoid

1. Waiting too long: Don't defer RHC until outpatient setting when diagnostic uncertainty exists during hospitalization - you lose the opportunity for immediate therapeutic adjustment 1

2. Over-diuresing before RHC: Aggressive diuresis may normalize PCWP and lead to misdiagnosis of PAH instead of HFpEF 5

3. Ignoring RV dysfunction: RVSP 70 mmHg suggests significant RV afterload; assess RV function and tricuspid regurgitation severity as these impact prognosis 10, 11

4. Not considering exercise hemodynamics: If resting hemodynamics are equivocal, exercise RHC can unmask HFpEF (though technically challenging) 12, 6