LA strain-volume slope during passive leg lift identified elevated pulmonary arterial wedge pressure with an AUC of 0.89 (95% CI 0.76-1.00), outperforming conventional echocardiographic measures.
Observational (n=51)
Does the simultaneous left atrial strain-volume relationship during passive leg lift improve the identification of elevated left ventricular filling pressure compared to conventional echocardiographic measures in patients with heart failure?
Left atrial strain-volume loops during passive leg lift provide superior diagnostic accuracy for detecting elevated left ventricular filling pressures compared to conventional echocardiographic parameters.
Effect estimate: AUC 0.89 (95% CI 0.76-1.00)
Background: The assessment of left ventricular (LV) filling pressure in heart failure (HF) poses a diagnostic challenge, as HF patients may have normal LV filling pressures at rest but often display elevated LV filling pressures during exercise. Rapid preload increase during passive leg lift (PLL) may unmask HF in such challenging scenarios. We explored the dynamic interplay between simultaneous left atrial (LA) function and volume using LA strain/volume loops during rest and PLL and compared its diagnostic performance with conventional echocardiographic surrogates to detect elevated LV filling pressure. Methods: We retrospectively reviewed 35 patients with clinical HF who underwent simultaneous echocardiography and right heart catheterization before and immediately after PLL. Patients with atrial fibrillation (n = 4) were excluded. Twenty age-matched, healthy controls were added as controls. LA reservoir strain (LASr) was analyzed using speckle-tracking echocardiography. LA strain–volume loops were generated, including the best-fit linear regression line employing simultaneous LASr and LA volume. Results: LA strain–volume slope was lower for HF patients when compared with controls (0.71 vs. 1.22%/mL, p < 0.001). During PLL, the LA strain–volume slope displayed a moderately strong negative correlation with invasive pulmonary arterial wedge pressure (PAWP) (r = −0.71, p < 0.001). At a 0.74%/mL cut-off, the LA strain–volume slope displayed 88% sensitivity and 86% specificity to identify elevated PAWP (AUC 0.89 0.76–1.00). In comparison, LASr demonstrated strong but numerically lower diagnostic performance (AUC 0.82 0.67–0.98), and mitral E/e’ showed poor performance (AUC 0.57 0.32–0.82). Conclusions: In this proof-of-concept study, LA strain–volume characteristics provide incremental diagnostic value over conventional echocardiographic measures in the identification of elevated LV filling pressure.
Venkateshvaran et al. (Sat,) conducted a observational in Heart failure (n=51). LA strain-volume slope during passive leg lift vs. Healthy controls and conventional echocardiographic measures was evaluated on Identification of elevated pulmonary arterial wedge pressure (AUC 0.89, 95% CI 0.76-1.00). LA strain-volume slope during passive leg lift identified elevated pulmonary arterial wedge pressure with an AUC of 0.89 (95% CI 0.76-1.00), outperforming conventional echocardiographic measures.