Application of Guideline-Based Echocardiographic Assessment of Left Atrial Pressure to Heart Failure with Preserved Ejection Fraction

Abstract

Early, noninvasive identification of patients with heart failure with preserved ejection fraction (HFpEF) with congestion may allow timely tailoring of decongestive therapies. The 2016 American Society of Echocardiography and European Association of Cardiovascular Imaging guidelines provide an algorithm to assess for elevated left atrial pressure (LAP); the associations of echocardiographic LAP with clinical status and disease progression in patients with HFpEF are unclear. Participants in the Phosphodiesterase-5 Inhibition to Improve Clinical Status and Exercise Capacity in HFpEF trial were categorized into one of four prespecified guideline-based echocardiographic LAP categories: (1) normal, (2) elevated, (3) atrial fibrillation (AF) at the time of echocardiography, or (4) indeterminate. Associations of echocardiographic LAP categories with baseline exercise capacity, change in exercise capacity, and change in N-terminal pro-B-type natriuretic peptide over 24weeks were evaluated. Of 216 participants, 199 underwent mitral inflow Doppler echocardiography for LAP categorization. Participants with elevated echocardiographic LAP (n=81) or AF (n=57) were older and had a higher prevalence of kidney dysfunction. Compared with the normal echocardiographic LAP group (n=28), elevated echocardiographic LAP and AF were each independently associated with a greater reduction in peak oxygen consumption over 24weeks after adjusting for baseline values and clinical covariates (β for elevated echocardiographic LAP=-1.55 [95% CI, -2.59 to -0.51], P=.004; β for AF=-1.33 [95% CI, -2.49 to -0.17], P=.03). Indeterminate echocardiographic LAP (n=33) was also independently associated with a reduction in exercise capacity at 24weeks compared with normal echocardiographic LAP (β=-1.35; 95% CI, -2.51 to -0.19; P=.02). Finally, elevated echocardiographic LAP and AF were significantly associated with increases in N-terminal pro-B-type natriuretic peptide over 24weeks compared with normal echocardiographic LAP. In patients with chronic HFpEF, elevated echocardiographic LAP and indeterminate echocardiographic LAP, as defined by contemporary guidelines, and AF were each independently associated with a reduction in exercise capacity compared with normal echocardiographic LAP. These findings suggest the potential utility of noninvasive LAP assessment in patients with HFpEF for tailoring treatments that decrease congestion.