Arai Hiroaki, Sato Hiroshi, Yamamoto Machiko, Kirigaya Hajime, Aizawa Tadanori, Fu Long-Tai
Department of Radiology, Cardiovascular Institute Hospital, Roppongi 7-3-10, Minato-ku, Tokyo 106-0032.
J Cardiol. 2003 May;41(5):235-9.
Power spectral analysis was used to analyze fluctuations of systolic blood pressure and heart rate.
Non-invasive finger plethysmography and electrocardiography were performed in 20 patients with chronic atrial fibrillation and in 10 age-matched healthy subjects with normal sinus rhythm. The impulse train was stored on a personal computer and the power spectrum of R-R interval and systolic blood pressure were obtained by Fourier analysis (0.01-0.03 Hz). The power spectrum (log power vs log frequency) characteristically revealed a linear regression as 1/f beta.
The R-R interval spectrum during atrial fibrillation showed a white noise-like flat spectrum when plotted as log power against log frequency, whereas the systolic blood pressure spectrum during atrial fibrillation showed a 1/f noise-like negative slope linear pattern. The spectrum exponent of systolic blood pressure in patients with atrial fibrillation was significantly lower than that in subjects with normal sinus rhythm (2.3 +/- 0.1 vs 1.3 +/- 0.1, p < 0.0001).
Systolic blood pressure fluctuation in patients with atrial fibrillation has a fractal component and is more complex than that of healthy subjects with normal sinus rhythm.
采用功率谱分析来分析收缩压和心率的波动情况。
对20例慢性房颤患者和10例年龄匹配、窦性心律正常的健康受试者进行无创手指体积描记法和心电图检查。脉冲序列存储在个人计算机上，通过傅里叶分析（0.01 - 0.03 Hz）获得R-R间期和收缩压的功率谱。功率谱（对数功率与对数频率）特征性地显示为1/fβ的线性回归。
当以对数功率对对数频率作图时，房颤期间的R-R间期谱显示出类似白噪声的平坦谱，而房颤期间的收缩压谱显示出类似1/f噪声的负斜率线性模式。房颤患者收缩压的谱指数显著低于窦性心律正常的受试者（2.3±0.1对1.3±0.1，p < 0.0001）。
房颤患者的收缩压波动具有分形成分，且比窦性心律正常的健康受试者更为复杂。
