Department of Anesthesiology, Catharina Hospital, Eindhoven, The Netherlands.
Department of Electrical Engineering, Technical University of Eindhoven, Eindhoven, The Netherlands.
Echocardiography. 2024 Aug;41(8):e15904. doi: 10.1111/echo.15904.
Point-of-care cardiovascular left ventricle ejection fraction (LVEF) quantification is established, but automatic tablet-based stroke volume (SV) quantification with handheld ultrasound (HAND) devices is unexplored. We evaluated a tablet-based monoplane LVEF and LV volume quantification tool (AutoEF) against a computer-based tool (Tomtec) for LVEF and SV quantification.
Patients underwent HAND scans, and LVEF and SV were quantified using AutoEF and computer-based software that utilized either apical four-chamber views (Auto Strain-monoplane [AS-mono]) or both apical four-chamber and apical two-chamber views (Auto Strain-biplane [AS-bi]). Correlation and Bland-Altman analysis were used to compare AutoEF with AS-mono and AS-bi.
Out of 43 participants, eight were excluded. AutoEF showed a correlation of .83 [.69:.91] with AS-mono for LVEF and .68 [.44:.82] for SV. The correlation with AS-bi was .79 [.62:.89] for LVEF and .66 [.42:.81] for SV. The bias between AutoEF and AS-mono was 4.88% [3.15:6.61] for LVEF and 17.46 mL [12.99:21.92] for SV. The limits of agreement (LOA) were [-5.50:15.26]% for LVEF and [-8.02:42.94] mL for SV. The bias between AutoEF and AS-bi was 6.63% [5.31:7.94] for LVEF and 20.62 mL [16.18:25.05] for SV, with LOA of [-1.20:14.47]% for LVEF and [-4.71:45.94] mL for SV.
LVEF quantification with AutoEF software was accurate and reliable, but SV quantification showed limitations, indicating non-interchangeability with neither AS-mono nor AS-bi. Further refinement of AutoEF is needed for reliable SV quantification at the point of care.
床边即时心血管左心室射血分数（LVEF）定量已得到证实，但手持式超声（HAND）设备的基于平板电脑的自动每搏量（SV）定量尚未得到探索。我们评估了一种基于平板电脑的单平面 LVEF 和 LV 容积定量工具（AutoEF）与基于计算机的工具（Tomtec）在 LVEF 和 SV 定量方面的性能。
患者接受 HAND 扫描，使用 AutoEF 和基于计算机的软件（分别使用心尖四腔视图的自动应变单平面[AS-mono]或心尖四腔和心尖两腔视图的自动应变双平面[AS-bi]）对 LVEF 和 SV 进行定量。采用相关分析和 Bland-Altman 分析比较 AutoEF 与 AS-mono 和 AS-bi 的相关性。
在 43 名参与者中，有 8 名被排除在外。AutoEF 与 AS-mono 用于 LVEF 的相关性为 0.83 [0.69：0.91]，用于 SV 的相关性为 0.68 [0.44：0.82]。与 AS-bi 的相关性，用于 LVEF 的为 0.79 [0.62：0.89]，用于 SV 的为 0.66 [0.42：0.81]。AutoEF 与 AS-mono 之间的偏差为 LVEF 的 4.88% [3.15：6.61]和 SV 的 17.46 mL [12.99：21.92]。用于 LVEF 的 LOA 为[-5.50：15.26]%，用于 SV 的 LOA 为[-8.02：42.94]mL。AutoEF 与 AS-bi 之间的偏差为 LVEF 的 6.63% [5.31：7.94]和 SV 的 20.62 mL [16.18：25.05]，用于 LVEF 的 LOA 为[-1.20：14.47]%，用于 SV 的 LOA 为[-4.71：45.94]mL。
AutoEF 软件进行 LVEF 定量准确可靠，但 SV 定量存在局限性，表明与 AS-mono 或 AS-bi 均不可互换。需要进一步改进 AutoEF 以实现床边即时可靠的 SV 定量。
