IEEE Trans Biomed Eng. 2023 Feb;70(2):715-722. doi: 10.1109/TBME.2022.3201433. Epub 2023 Jan 19.
Oscillogram modeling is a powerful tool for understanding and advancing popular oscillometric blood pressure (BP) measurement. A reduced oscillogram model relating cuff pressure oscillation amplitude ( ∆O) to external cuff pressure of the artery ( P) is: [Formula: see text], where g(P) is the arterial compliance versus transmural pressure ( P) curve, P and P are systolic and diastolic BP, and k is the reciprocal of the cuff compliance. The objective was to determine an optimal functional form for the arterial compliance curve.
Eight prospective, three-parameter functions of the brachial artery compliance curve were compared. The study data included oscillometric arm cuff pressure waveforms and invasive brachial BP from 122 patients covering a 20-120 mmHg pulse pressure range. The oscillogram measurements were constructed from the cuff pressure waveforms. Reduced oscillogram models, inputted with measured systolic and diastolic BP and each parametric brachial artery compliance curve function, were optimally fitted to the oscillogram measurements in the least squares sense.
An exponential-linear function yielded as good or better model fits compared to the other functions, with errors of 7.9±0.3 and 5.1±0.2% for tail-trimmed and lower half-trimmed oscillogram measurements. Importantly, this function was also the most tractable mathematically.
A three-parameter exponential-linear function is an optimal form for the arterial compliance curve in the reduced oscillogram model and may thus serve as the standard function for this model henceforth.
The complete, reduced oscillogram model determined herein can potentially improve oscillometric BP measurement accuracy while advancing foundational knowledge.
振子图建模是理解和推动流行的示波法血压（BP）测量的强大工具。一个将袖带压力振荡幅度（ΔO）与动脉外部袖带压力（P）相关联的简化振子图模型为：[公式：见正文]，其中 g（P）是动脉顺应性与跨壁压（P）曲线，P 和 P 是收缩压和舒张压，k 是袖带顺应性的倒数。目的是确定动脉顺应性曲线的最佳函数形式。
比较了 8 种前瞻性的、三参数的肱动脉顺应性曲线函数。研究数据包括来自 122 例患者的示波法手臂袖带压力波形和侵入性肱动脉血压，涵盖了 20-120mmHg 的脉压范围。振子图测量值是从袖带压力波形构建的。输入测量的收缩压和舒张压以及每个参数化肱动脉顺应性曲线函数的简化振子图模型，以最小二乘法最佳拟合振子图测量值。
与其他函数相比，指数线性函数产生了相同或更好的模型拟合，对于修剪尾部和修剪下半部分的振子图测量值，误差分别为 7.9±0.3%和 5.1±0.2%。重要的是，该函数在数学上也最具可操作性。
三参数指数线性函数是简化振子图模型中动脉顺应性曲线的最佳形式，因此可能成为该模型的标准函数。
本文确定的完整简化振子图模型有可能在提高示波法 BP 测量精度的同时，推进基础理论知识。
