scholarly journals Diaphragmatic Compound Muscle Action Potentials Recorded From Over the Sternum and Lateral Chest Wall: a Comparative Study

2022 ◽  
Author(s):  
Gihan Younis ◽  
Noha EL-Sawy ◽  
Rehab Elnemr ◽  
Doaa Madkour
Keyword(s):  
Chest Wall ◽  
Phrenic Nerve ◽  
Action Potentials ◽  
Normative Data ◽  
Normative Values ◽  
Muscle Action ◽  
Men And Women ◽  
Compound Muscle Action Potentials ◽  
Lateral Chest ◽  
The Mean

Abstract Objectives:To report normative data for diaphragmatic compound muscle action potentials (DCMAPs) recorded from over the sternum and lateral chest wall (LCW).Method:The phrenic nerve of seventy-three healthy subjects was bilaterally stimulated at the posterior border of the sternocleidomastoid muscle. DCMAPs from over the sternum and LCW were recorded (inspiration/expiration). Results: Normative values of sternal and LCW DCMAPs were presented. Significant differences were found between sternal and LCW potentials in the mean latency, amplitude, and area (p<0.001). The duration did not differ between the two sites. Differences were found between inspiration and expiration, right and left sides, and men and women. Regression analysis showed a relation between latency of sternal and LCW potentials and age. Latency (LCW potentials) and amplitude and area (sternal/LCW potentials) were related to gender. Amplitude (LCW potentials/inspiration) and area (sternal potentials/inspiration) were related to chest circumference (p=0.023 and 0.013 respectively). Area (sternal potentials/expiration) was related to the BMI (p=0.019). Conclusions: Our normative values for sternal and LCW DCMAPs are provided. Notable differences in the DCMAPs parameters were detected between the two recording sites, inspiration and expiration, right and left, and men and women. Significance:The technique of phrenic nerve should be standardized.

Diaphragm interference pattern EMG and compound muscle action potentials: effects of chest wall configuration

1997 ◽  
Vol 82 (2) ◽  
pp. 520-530 ◽  
Author(s):  
Jennifer Beck ◽  
Christer Sinderby ◽  
Lars Lindström ◽  
Alex Grassino
Keyword(s):  
Power Spectrum ◽  
Chest Wall ◽  
Interference Pattern ◽  
Action Potentials ◽  
Center Frequency ◽  
Electrode Position ◽  
Muscle Action ◽  
Compound Muscle Action Potentials ◽  
Residual Capacity ◽  
Electrode Positioning

Beck, Jennifer, Christer Sinderby, Lars Lindström, and Alex Grassino. Diaphragm interference pattern EMG and compound muscle action potentials: effects of chest wall configuration. J. Appl. Physiol. 82(2): 520–530, 1997.—The effect of chest wall configuration on the diaphragm electromyogram (EMGdi) was evaluated in five healthy subjects with an esophageal electrode for both interference pattern EMGdi (voluntary contractions) and electrically evoked diaphragm compound muscle action potentials (CMAPs). Diaphragm CMAPs (both unilateral and bilateral) were evaluated for the baseline-to-peak amplitude (Ampl), the time from the onset of the CMAP to first peak (T1), root mean square (RMS), and center frequency (CF) values of the CMAP power spectrum. CF values from the interference pattern EMGdi power spectrum were also calculated. For CMAPs obtained at an electrode position least influenced by variations induced by electrode positioning, Ampl increased with diaphragm shortening from functional residual capacity (FRC) to total lung capacity (TLC) by 101 and 98% (unilateral and bilateral, respectively). Bilateral CMAP RMS values increased 116% from FRC to TLC. CMAP T1 values decreased with diaphragm shortening from FRC to TLC by 1.1 and 2.1 ms for the unilateral and bilateral stimulations, respectively, and CF increased for the bilateral diaphragm CMAPs with diaphragm shortening. CF values from the interference pattern EMGdi did not show any consistent change with chest wall configuration. Thus CF values of the interference pattern EMGdi obtained with an esophageal electrode can be considered reliable for physiological interpretation, at any diaphragm length (if electrode positioning and signal contamination are controlled for), contrary to the diaphragm CMAPs, which are sensitive to changes in chest wall configuration. It is speculated that the different results (over the effects of chest wall configuration on interference pattern EMGdi and diaphragm CMAPs) may be because of summation properties of the signals and how these influence the EMG power spectrum.

Application of a cervical stimulating apparatus for bilateral transcutaneous phrenic nerve stimulation

1995 ◽  
Vol 79 (2) ◽  
pp. 632-637 ◽  
Author(s):  
P. R. Eastwood ◽  
J. A. Panizza ◽  
D. R. Hillman ◽  
K. E. Finucane
Keyword(s):  
Nerve Stimulation ◽  
Phrenic Nerve ◽  
Action Potentials ◽  
Muscle Action ◽  
Phrenic Nerve Stimulation ◽  
Transdiaphragmatic Pressure ◽  
Diaphragmatic Function ◽  
Compound Muscle Action Potentials ◽  
Residual Capacity ◽  
Left And Right

Transcutaneous bilateral phrenic nerve stimulation (tPNS) is frequently used to assess diaphragmatic function in humans. Commonly, stimulation is performed with hand-held electrodes; however, these are unsuitable for studies requiring repeated PNS and where recruitment of rib cage and neck muscles may shift the probes in relation to the nerves. In this study we describe the design of a cervical neck brace and electrode probes that maintain stimulating electrodes in constant position relative to the phrenic nerves and facilitates studies requiring repeated maximal PNS. The effectiveness of the apparatus was examined by 1) reviewing the reproducibility of the transdiaphragmatic pressure response to 0.1 ms tPNS (PdiT) at relaxed functional residual capacity in four subjects studied on 25 +/- 8 (SD) occasions (> or = 24 h apart) over a 4-yr period, and 2) measuring peak-to-peak amplitude of the left and right diaphragmatic compound muscle action potentials (surface electrodes) during two prolonged studies (38 +/- 9 min) in each subject, when tPNS was performed during repeated submaximal and maximal inspiratory efforts. PdiT was reproducible in each subject when measured repeatedly within a single study [coefficient of variation (CV) of 3.8 +/- 0.8%] and over separate days (CV of 11.5 +/- 3.5%). The peak-to-peak amplitudes of the left and right compound muscle action potentials were also reproducible (CV of 8.4 +/- 4.3 and 8.4 +/- 2.9%, respectively) and independent of the degree of effort. The apparatus appears effective for the maintenance of maximal stimulation under varied conditions for long periods and provides reproducible measurements of PdiT both within and between studies.

Latency of compound muscle action potentials of the anal sphincter after magnetic sacral stimulation

2001 ◽  
Vol 24 (9) ◽  
pp. 1232-1235 ◽  
Author(s):  
G.L. Morren ◽  
S. Walter ◽  
H. Lindehammar ◽  
O. Hallböök ◽  
R. Sjödahl
Keyword(s):  
Anal Sphincter ◽  
Action Potentials ◽  
Muscle Action ◽  
Compound Muscle Action Potentials ◽  
Sacral Stimulation

Mapping the Compound Muscle Action Potentials of Cricothyroid Muscle Using Electromyography in Thyroid Operations

2009 ◽  
Vol 250 (2) ◽  
pp. 293-300 ◽  
Author(s):  
Ben Selvan ◽  
Srinivasa Babu ◽  
M J. Paul ◽  
Deepak Abraham ◽  
Prasanna Samuel ◽  
...  
Keyword(s):  
Action Potentials ◽  
Muscle Action ◽  
Cricothyroid Muscle ◽  
Compound Muscle Action Potentials

scholarly journals Facial nerve electroneurography: variability in normal subjects

1996 ◽  
Vol 54 (3) ◽  
pp. 393-396 ◽  
Author(s):  
Jovany Luis Alves de Medeiros ◽  
João Antonio Maciel Nobrega ◽  
Luiz Augusto Franco de Andrade ◽  
Yara Juliano
Keyword(s):  
Facial Nerve ◽  
Action Potentials ◽  
Normal Values ◽  
Normal Subjects ◽  
Nasolabial Fold ◽  
Confidence Limits ◽  
Muscle Action ◽  
Surface Electrodes ◽  
Normal Individuals ◽  
Compound Muscle Action Potentials

Twenty normal individuals were submitted to facial nerve electroneurography using different techniques in order to determine the most accurate to obtain the latencies and amplitudes of the compound muscle action potentials (CMAP) of the facial muscles. First of all it was determined in which muscle or muscle group highest amplitude CMAP could be recorded with the lowest variability between sides and in test-retest. Different techniques were studied in order to determine which could give the best results. This was shown to be an arrangement of bipolar surface electrodes fixed to a plastic bar. The records with higher amplitude where obtained from the nasolabial fold muscles. Therefore 65 normal volunteers were examined using this technique and recording the potentials obtained over the nasolabial fold muscles. Normal values were determined (latency lower than 4.5 ms and amplitude larger than 2 mV - 95% confidence limits).

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