The thoracostomy tube is inserted above either the 5th or 6th rib along the midaxillary line
, and connected to an underwater seal apparatus and suction.
Four locations were tested during these mapping tests, and the first three locations used electrodes in a straight line with equal separation between electrodes: (1) along the midaxillary line
, a line that is parallel and approximately 10 cm ventral to the vertebra; the four bilateral electrodes were placed from the seventh rib interspace to the third lumbar area (Figure 1); (2) along a line 4 cm dorsal to the midaxillary line
; (3) along the rostral edge of costal margin that separates the ribs from the abdomen, the line included three electrodes along the margin and the fourth dorsal to the margin; (4) a box arrangement was used with two electrodes ventral and two electrodes dorsal and placement of these electrodes was in the midlateral abdominal area.
After identification of the transversus plane between internal oblique and trasversus abdominis muscles, the probe is moved postero-laterally to lie across the midaxillary line
just superior to the iliac crest (over the triangle of Petit).
The suprailiac skinfold was pinched at 2-3 cm above the iliac crest on the lateral side and midaxillary line
A 4 mm hematoma was present along the left chest wall in the midaxillary line
The physical examination included subjective assessment of the loss of subcutaneous fat over the triceps and midaxillary line
of the lateral chest wall, muscle wasting in the deltoids and quadriceps, and the presence of ankle edema and/or ascites.