2.5 Diaphragm USG (Figure 2)
The 3-5 MHz curvilinear probe was placed at the right and left subcostal
areas at the anterior axillary lines and directed medially and
cranially. The M-mode was used to assess the diaphragm excursion and
thickness. The amplitude of excursion of the diaphragm was measured on
the vertical axis as the distance between the baseline to the maximum
height of inspiration and expiration on the M-mode tracing23 .The maximum thickness of diaphragm during
inspiration (I) and expiration (E) was also measured.