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Abstract

Volume 9, Issue 3 (May 2007) 9, 369–376; 10.1111/j.1745-7262.2007.00259.x

Application of correlation techniques in the analysis of corpus cavernosum electromyographic signals

Xiao-Gang Jiang, Jan Holsheimer, Ljubomir Manola, Gorm Wagner, Hessel Wijkstra, Ben Knipscheer and Eric J H Meuleman

1.Department of Urology, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, the Netherlands
2.Institute for Biomedical Technology, University of Twente, 7500 AE Enschede, the Netherlands
3.Institute of Preventive Medicine, Copenhagen University Hospital, DK-1375 Copenhagen, Denmark
4.Department of Urology, Academic Medical Centre, 1105 AZ Amsterdam, the Netherlands
5.Department of Urology, Free University Medical Centre, 1007 MB Amsterdam, the Netherlands

Correspondence: Dr Eric J. H. Meuleman, Department of Urology, Free University Medical Centre, PO Box 7057, 1007 MB Amsterdam, the Netherlands. Fax: +31-20-642-5085. E-mail: E.Meuleman@vumc.nl

Received 18 May 2006; Accepted 6 November 2006.

Abstract

Aim: To establish an objective, easy-to-use and comprehensive method to analyze corpus cavernosum electromyographic signals (CC-potentials).

Methods: CC-potentials were recorded during flaccidity in 23 young healthy volunteers, with surface electrodes placed on the penile shaft bilaterally. Based on the correlation function of Matlab software, an application program for the analysis of CC-potentials was developed. Individual CC-potentials and their autocorrelation function were evaluated, yielding parameters amplitude (A), duration (D), and dominant frequency (DF). The cross-correlation function of both longitudinal and bilateral pairs of adjacent electrodes was calculated to assess the similarity and mutual delay of CC-potentials recorded simultaneously from different parts of the CC. The parameters derived were squared maximum cross-correlation coefficient (Rmax) and delay (). Based on the absolute value of and the corresponding inter-electrode distance, propagation velocity (PV) was calculated.

Results: The values of the parameters were determined automatically. No significant difference related to the locations of the electrodes for parameters A, D, and DF was detected. The cross-correlation showed that both longitudinal and bilateral CC-potential pairs had highly similar waveforms (the absolute values of Rmax were 0.80 0.05 and 0.87 0.06, respectively). PV of longitudinal pairs was estimated as 6.15 3.98 cm/s.

Conclusion: The application program for correlation analysis of CC-potentials is a comprehensive and versatile method to analyze corpus cavernosum electromyographic recordings. Its objectiveness makes multi-center application possible.

Keywords: corpus cavernosum, corpus cavernosum electromyography, electrophysiology, erectile dysfunction, smooth muscle

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Asian Journal of Andrology CN 31-1795/R ISSN 1008-682X  Copyright © 2023  Shanghai Materia Medica, Chinese Academy of Sciences.  All rights reserved.