Computer-Assisted Evaluation of
the Smooth-Muscle
Electromyogram of the Corpora
cavernosa by Fast Fourier
Transformation

Stief, Christian G.; Kellner, B.; Hartung, Christoph; Hauck, Ekkehard W.; Schlote, Norbert; Truß, Michael C.; Hinrichs, Herrmann; Jonas, Udo

doi:10.1159/000474477

Cited by 20 publications

(6 citation statements)

References 12 publications

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“…Although CC‐EMG has been studied already for 16 years [1–5], doubts regarding its reproducibility have remained. Notwithstanding that some studies have demonstrated that CC‐potentials are reproducible [3,6], their outcome may be questioned because it is based on visual inspection and not on quantitative evaluation. In the literature the only quantitative study on reproducibility of CC‐EMG was performed by Fabra et al.…”

Section: Introductionmentioning

confidence: 99%

“…Although CC-EMG has been studied already for 16 years [1][2][3][4][5], doubts regarding its reproducibility have remained. Notwithstanding that some studies J Sex Med 2007;4: [183][184][185][186][187][188][189][190] have demonstrated that CC-potentials are reproducible [3,6], their outcome may be questioned because it is based on visual inspection and not on quantitative evaluation. In the literature the only quantitative study on reproducibility of CC-EMG was performed by Fabra et al [4], who performed a comparison of two independent measurements in a group of healthy men, and demonstrated that most CC-potential parameters such as the number of CC-potentials per time unit at rest and after provocation maneuvers are irreproducible, while parameters such as amplitude and duration are reproducible.…”

Section: Introductionmentioning

confidence: 99%

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A Reproducibility Study of Corpus Cavernosum Electromyography in Young Healthy Volunteers Under Controlled Conditions

Jiang

Holsheimer

Wagner

et al. 2007

The Journal of Sexual Medicine

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Introduction Although the corpus cavernosum electromyography (CC-EMG) has been studied already for 16 years, doubts regarding its reproducibility have remained. Aim To assess the reproducibility of CC-EMG under controlled conditions and the influence of confounding factors. Methods Three CC-EMG recording sessions were performed in 13 healthy young men under the same conditions. Furthermore, the effects of potentially confounding factors, such as intake of caffeine, alcohol and smoking, and sexual activity, were investigated in the same population. Using auto- and cross-correlation techniques, CC-potentials were characterized with parameters amplitude (A), duration (D), dominant frequency (DF), maximum cross-correlation coefficient of longitudinal and bilateral CC-potential pairs (Rmax-lon. and Rmax-bi.), and propagation velocity (PV). Main Outcome Measures Comparison of CC-EMG parameters A, D, DF, Rmax-lon., and Rmax-bi. between three recording sessions and assessment of the impact of confounding factors on these parameters. Results DF, D, A, and Rmax-lon. showed significant correlations among three sessions; PV showed significant correlations between two sessions performed within the same day but not between those performed on different days; Rmax-bi. did not show significant correlations between any two sessions. Intake of caffeine, alcohol, and smoking did not affect CC-potentials, while the recordings shortly after ejaculation showed more irregular oscillations and less CC-potentials with smaller A. Conclusion CC-potential parameters DF, D, A, and Rmax-lon. have been demonstrated to be reproducible. The results provide a basis for the clinical and scientific application of CC-EMG. CC-potentials are not sensitive to confounding factors such as intake of caffeine, alcohol, and smoking, while measurements shortly after ejaculation should be avoided.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Reproducibility Study of Corpus Cavernosum Electromyography in Young Healthy Volunteers Under Controlled Conditions

Jiang

Holsheimer

Wagner

et al. 2007

The Journal of Sexual Medicine

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“…To overcome these inconveniences, algorithms based on mathematical frequency analyses have been used, resolving the spectrum based on the Fourier function 14 or the application of fuzzy logic. 15 All this has greatly complicated the technique, thus explaining why despite its introduction 420 years ago, the procedure has not yet been transferred from the laboratory setting to routine clinical practice.…”

Section: Inferential Statisticsmentioning

confidence: 99%

Usefulness of electromyography of the cavernous corpora (CC EMG) in the diagnosis of arterial erectile dysfunction

et al. 2012

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Electromyography (EMG) of the corpora cavernosa (CC-EMG) is able to record the activity of the erectile tissue during erection, and thus has been used as a diagnostic technique in patients with erectile dysfunction (ED). The present study examines the usefulness of the technique in the diagnosis of arterial ED. A cross-sectional study was made of 35 males with a mean age of 48.5 years (s.d. 11.34), referred to our center with ED for 41 year. The patients were subjected to CC-EMG and a penile Doppler ultrasound study following the injection of 20 mg of prostaglandin E1 (PGE1). The patients were divided into three groups according to their response to the intracavernous injection of PGE1: Group 1 (adequate erection and reduction/ suppression of EMG activity); Group 2 (insufficient erection and persistence of EMG activity); and Group 3 (insufficient erection and reduction/suppression of EMG activity). Patient classification according to response to the intracavernous injection of PGE1 was as follows: Group 1: six patients (17%), Group 2: 18 patients (51%), and Group 3: 11 patients (31%). Patients diagnosed with arterial insufficiency according to Doppler ultrasound (systolic arterial peak velocity o30 mm s À1 in both arteries) were significantly older than those without such damage (54.5 versus 41.8 years, respectively; s.d. 11.12). The patients in Group 3 showed a significantly lower maximum systolic velocity in both arteries than the subjects belonging to Group 2. Likewise, a statistically significant relationship was observed between the diagnosis of arterial insufficiency and patient classification in Group 3. The confirmation of insufficient erection associated with reduction/suppression of EMG activity showed a sensitivity of 66.7% (confidence interval between 50 and 84%) and a specificity of 92.9% (confidence interval between 84 and 100%) in the diagnosis of arterial ED. Owing to the high specificity of CC-EMG response to the injection of PGE1, this test is considered useful as a screening technique in the diagnosis of arterial ED.

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“…The purpose of reducing the higher cut-off frequency to 5.0 Hz was to suppress high frequency, common signal components (in particular electrocardiographic signals) as much as possible without attenuating the CC-potential amplitude. It has been demonstrated that CC-potential power in normal subjects is actually below 5.0 Hz [2,7].…”

Section: Data Collectionmentioning

confidence: 99%

“…Most clinical investigators measured the values of parameters manually [4][5][6], which is time-consuming, imprecise and not objective. Stief et al [7] and Kellner et al [8] addressed this issue by introducing Fourier analysis and computerized classification of CC-potential components by fuzzy logic and neural networks. However, these methods have not been applied by other centers, probably because the required basic knowledge of linear systems analysis is generally beyond the expertise of clinical physicians.…”

mentioning

confidence: 99%

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

Jiang¹,

Holsheimer²,

Manola³

et al. 2007

Asian J Andrology

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Computer-Assisted Evaluation of the Smooth-Muscle Electromyogram of the Corpora cavernosa by Fast Fourier Transformation

Cited by 20 publications

References 12 publications

A Reproducibility Study of Corpus Cavernosum Electromyography in Young Healthy Volunteers Under Controlled Conditions

A Reproducibility Study of Corpus Cavernosum Electromyography in Young Healthy Volunteers Under Controlled Conditions

Usefulness of electromyography of the cavernous corpora (CC EMG) in the diagnosis of arterial erectile dysfunction

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

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