Encyclopedia of capnograms
Dual waveform capnogram
In addition, a dual capnogram can result during endobronchial intubation and in patients with severe kyphoscoliosis.
Tripati et al have described another capnogram with a “tail up” as shown below during the use of an accidentally crushed sampling tube with a slit-like hole.
Tripati M, Pandey M. Atypical “tails up” capnogram due to breach in the sampling tube of side-stream capnometer. J Clin Monit 2000;16:17-20.