Normal and abnormal capnograms

This graphic shows normal and abnormal capnograms, as follows:
A. Normal capnogram during positive pressure ventilation
B. Normal capnogram during spontaneous ventilation
C. Upsloping plateau that might occur with bronchospasm or a kinked or obstructed endotracheal tube
D. Notched plateau caused by attempts at spontaneous ventilation during controlled mechanical ventilation
E. Progressive decrease and disappearance of capnogram during esophageal intubation
F. Rebreathing of carbon dioxide
G. Abrupt shortening of plateau phase, as might occur with ruptured endotracheal tube cuff