The diagnosis of heart failure with preserved ejection fraction (HFpEF) remains challenging. Exercise-stress testing is recommended in case of uncertainty; however, this approach is time-consuming and costly. Since preserved EF does not represent normal systolic function, we hypothesized comprehensive cardiovascular magnetic resonance (CMR) assessment of cardiac hemodynamic forces (HDF) may identify functional abnormalities in HFpEF.
MethodsThe HFpEF Stress Trial (DZHK-17; Clinicaltrials.gov: NCT03260621) prospectively recruited 75 patients with exertional dyspnea, preserved EF (≥50%) and signs of diastolic dysfunction (E/e’ ≥8) on echocardiography. Patients underwent rest and exercise-stress right heart catheterisation, echocardiography and CMR. The final study cohort consisted of 68 patients (HFpEF n = 34 and non-cardiac dyspnea n = 34 according to pulmonary capillary wedge pressure (PCWP)). HDF assessment included left ventricular (LV) longitudinal, systolic peak and impulse, systolic/diastolic transition, E-wave deceleration as well as A-wave acceleration forces. Follow-up after 24 months evaluated cardiovascular mortality and hospitalisation (CVH) – only two patients were lost to follow-up.
FindingsHDF assessment revealed impairment of LV longitudinal function in patients with HFpEF compared to non-cardiac dyspnoea (15.8% vs. 18.3%, p = 0.035), attributable to impairment of systolic peak (38.6% vs 51.6%, p = 0.003) and impulse (20.8% vs. 24.5%, p = 0.009) forces as well as late diastolic filling (−3.8% vs −5.4%, p = 0.029). Early diastolic filling was impaired in HFpEF patients identified at rest compared with patients identified during stress only (7.7% vs. 9.9%, p = 0.004). Impaired systolic peak was associated with CVH (HR 0.95, p = 0.016), and was superior to LV global longitudinal strain assessment in prediction of CVH (AUC 0.76 vs. 0.61, p = 0.048).
InterpretationAssessment of HDF indicates impairment of LV systolic ejection force in HFpEF which is associated with cardiovascular events.
FundingGerman Centre for Cardiovascular Research (DZHK).
KeywordsHFpEF
Cardiovascular magnetic resonance
Hemodynamic force
Deformation imaging
Strain
AbbreviationsbSSFPbalanced steady state free precession
CMRcardiovascular magnetic resonance
CVHcardiovascular hospitalisation
GLS/GCS/GRSglobal longitudinal/circumferential/radial strain
EDV/ESVEnd diastolic/systolic volume
EesEnd-systolic elastance
HFpEFheart failure with preserved ejection fraction
HFrEFheart failure with reduced ejection fraction
IVPGintraventricular pressure gradient
LAVILeft atrial volume index
NTproBNPN-terminal prohormone of brain natriuretic peptide
NYHANew York Heart Association
PCWPPulmonary capillary wedge pressure
RHCright heart catheterisation
© 2022 The Author(s). Published by Elsevier B.V.
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