Nonlinear mechanics of the heart's swinging during pericardial effusion.
Nonlinear mechanics of the heart's swinging during pericardial effusion.
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心包积液期间心脏摆动的非线性力学。
DOI：
10.1152/ajpheart.1989.257.4.h1292
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Goldberger,AL
中科院分区：
文献类型：
--
作者：
Rigney,DR;Goldberger,AL
当过多的液体积聚在心包腔中时，由大血管悬挂的心脏就像钟摆一样自由摆动。摆动可以以与心率相同的频率（1：1振荡）或以心率的一半（2：1振荡）发生，后一种频率通常在心脏填塞期间出现。我们表明，这两个频率的振荡可以解释的牛顿运动方程的非线性应用于心脏。方程中的项对应于重力和浮力、由于血液喷射到大血管中的力以及阻尼力。当模型的特定参数改变时，特别是当心率增加时，发现1：1和2：1摆动之间的过渡。这一发现与以前的临床报告一致。
When excessive fluid accumulates in the pericardial space, the heart, suspended by the great vessels, is then free to swing as a pendulum. The swinging may occur at either the same frequency as the heart rate (1:1 oscillation) or at half the heart rate (2:1 oscillation), the latter frequency often arising during cardiac tamponade. We show that these two frequencies of oscillation may be explained by the nonlinearity of Newton's equation of motion as applied to the heart. Terms in the equation correspond to gravitational and buoyancy forces, forces due to ejection of blood into the great vessels, and damping forces. A transition between the 1:1 and 2:1 swinging is found to occur when particular parameters of the model are changed, notably when there is an increase of heart rate. This finding is compatible with previous clinical reports.