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Surface diaphragmatic electromyogram changes after laparotomy.

Stéphane V Berdah¹, Robert Picaud, Yves Jammes

¹Laboratoire de Physiopathologic Respiratoire (EA2201), Institut Jean Roche, Faculté de Médecine, Marseille, France. sberdah@mail.ap-hm.fr

Clinical Physiology and Functional Imaging

|May 15, 2002

Summary

Supraumbilical laparotomy alters diaphragm function, indicated by increased root mean square (RMS) and decreased median frequency (ME) in surface diaphragmatic electromyogram (EMG) recordings post-surgery. These changes suggest reduced diaphragmatic excitability or central drive.

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Area of Science:

Physiology
Surgical Research
Respiratory Medicine

Background:

Diaphragmatic function is crucial for respiration.
Supraumbilical laparotomy is a common surgical procedure.
Postoperative respiratory complications can arise from altered diaphragmatic function.

Purpose of the Study:

To objectively assess changes in diaphragmatic electromyogram (EMG) after supraumbilical laparotomy.
To quantify modifications in diaphragmatic electrical activity following abdominal surgery.

Main Methods:

Surface diaphragmatic EMG was recorded in patients before and after supraumbilical laparotomy.
Recordings were also taken from healthy volunteers for comparison.
Standardized inspiratory efforts (Muller manoeuvres) to -30 cmH2O were used.

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Main Results:

Significant postoperative changes in diaphragmatic EMG were observed.
The root mean square (RMS) of the EMG signal increased.
The median frequency (ME) of the EMG signal decreased.

Conclusions:

Postoperative supraumbilical laparotomy leads to measurable changes in diaphragmatic EMG.
Findings indicate potential alterations in diaphragmatic excitability or reduced central neural drive to the diaphragm.