Title :
Studies of detrusor-sphincter synergia and dyssynergia during micturition in rats via fractional Brownian motion
Author :
Chang, Shyang ; Mao, Shu-Ting ; Hu, Shih-Jen ; Lin, Wen-Ching ; Cheng, Chen-Li
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
In normal humans, the bladder is supposed to empty by a synergistic contraction of the detrusor and relaxation of the sphincter during micturition. By contrast, suprasacral spinal cord injury (SCI) patients usually will have both of them contract simultaneously and result in the so-called detrusor-sphincter dyssynergia. In this study, the cystometrograms of the detrusor and the electromyograms of external urethral sphincter of intact and SCI female Wistar rats are used to investigate the detrosor-sphincter synergia and dyssynergia during micturition. Due to the statistical self-similarity of the waveforms, the cystometrogram is modeled as discrete-time fractional Brownian motion and the electromyogram as discrete-time fractional Gaussian noise. Fractal dimensions of both of them are calculated and used as indices in the investigation of synergia. Results indicate that, for intact rats, the sphincter muscle is not only active but also recruited in a synchronous fashion with the detrusor. Furthermore, clear-cut measure using the fractal dimensions can be used to diagnose detrusor-sphincter synergia and dyssynergia.
Keywords :
Brownian motion; biological fluid dynamics; electromyography; fractals; physiological models; SCI female Wistar rats; cystometrograms; detrusor-sphincter dyssynergia; diagnosis; discrete-time fractional Gaussian noise; external urethral sphincter; statistical self-similarity; suprasacral spinal cord injury patients; Bladder; Brownian motion; Contracts; Fractals; Gaussian noise; Humans; Muscles; Rats; Recruitment; Spinal cord injury; Algorithms; Animals; Biomedical Engineering; Female; Fractals; Humans; Models, Biological; Muscle Contraction; Rats; Rats, Wistar; Spinal Cord Injuries; Urinary Tract; Urinary Tract Physiology; Urination;
Journal_Title :
Biomedical Engineering, IEEE Transactions on