Effects of Thoracic Extradural Block on Diaphragmatic Activity After Upper Abdominal Surgery

Pansard, J. L.; Philip, Y.; Bahnini, Amine; Brichant, Jean-François; Delima, Mariam Grace; Mankikian, B.; Viars, P.

doi:10.1097/00000542-198709001-00537

Cited by 5 publications

(2 citation statements)

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“…However, the commonly used index of contractility, the ratio of EMG to Pdi, is altered by both posture and the degree of abdominal muscle activity 21 , and therefore this would not have been of great value. Other workers have found that maximum diaphragmatic electromyographic activity is reduced after abdominal surgery but this appears to be in proportion to the reduction in tidal volume 22 . Contractility appears unaffected 23 .…”

Section: Discussionmentioning

confidence: 89%

Respiratory mechanics after abdominal surgery measured with continuous analysis of pressure, flow and volume signals

Nimmo

Drummond

1996

British Journal of Anaesthesia

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We studied 10 patients during the first night after upper abdominal surgery to assess the effect of airway obstruction on chest wall mechanics, by recording nasal gas flow and carbon dioxide concentration, rib cage and abdominal dimensions, abdominal muscle activity, and oesophageal and gastric pressures. The mean duration of study of each subject was 5.8 h, and 5.2 h were analysed. The median proportion of time spent breathing with normal mechanics was 29% (interquartile values 0-57%). Abnormal abdominal mechanical events were common and associated with airway obstruction (P < 0.001). Two common patterns of abnormal pressure and movement were found. In the first, abdominal pressure decreased at the onset of inspiration and there was a phase lag in abdominal movement. The incidence was 33 (14-50)%. In the second pattern, abdominal pressure decreased and in addition the abdominal wall moved inwards at the onset of inspiration. This occurred for 34 (0-52)% of the time. Both patterns were associated with evidence of increased activation of the abdominal muscles during expiration, changing the relationship of abdominal and pleural pressure changes and chest wall movements. Such changes have been interpreted previously as evidence of diaphragm dysfunction.

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Section: Discussionmentioning

confidence: 89%

Respiratory mechanics after abdominal surgery measured with continuous analysis of pressure, flow and volume signals

Nimmo

Drummond

1996

British Journal of Anaesthesia

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“…Studies of respiratory movement are generally for short measurement periods [26][27][28][29][30] . Overnight studies measuring respiratory movement or gas flow are uncommon, the study of Catley and colleagues being an exception 1 .…”

Section: Discussionmentioning

confidence: 99%

Thoracic impedance used for measuring chest wall movement in postoperative patients

Drummond

Nimmo

Elton

1996

British Journal of Anaesthesia

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Thoracic impedance (TTI) and rib cage inductance band (IB) signals were measured in 10 patients during the first night after abdominal surgery, and compared by successive correlation of the change in each signal. Poor matching of the signals occurred, on average, for 94 min either because of movement of differences in the waveform. There were frequent episodes of transient poor correlation, generally associated with transient respiratory disturbance, predominantly airway obstruction (58%). Thoracic impedance measurements are simpler than inductance band methods for detecting rib cage movement and may be useful for large studies of respiratory abnormalities in patients after operation.

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Respiratory Changes Induced by Upper Abdominal and Cardiac Surgery

Clergue¹,

Pansard²

1990

Update 1990

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Effects of Thoracic Extradural Block on Diaphragmatic Activity After Upper Abdominal Surgery

Cited by 5 publications

References 0 publications

Respiratory mechanics after abdominal surgery measured with continuous analysis of pressure, flow and volume signals

Respiratory mechanics after abdominal surgery measured with continuous analysis of pressure, flow and volume signals

Thoracic impedance used for measuring chest wall movement in postoperative patients

Respiratory Changes Induced by Upper Abdominal and Cardiac Surgery

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