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A Comprehensive Educational Website (established 1998)

Designed, Produced, and maintained (Edition 10, March 2019) by 

Bhavani Shankar Kodali MD

Rebreathing capnograms

Encyclopedia of capnograms

Bhavani Shankar Kodali MD

Rebreathing capnograms

Bain anesthetic system or Mapelson D circuit-

Note the smaller inspiratory wave due to rebreathing - signature capnogram

bain.gif

Details

 

Exhausted Soda lime

Gradual elevation of baseline and the height of the capnograms

elrebrwave.gif

 

Baseline is elevated, but height can remain the same due to hyperventilation

elbrb.gif

Baseline is elevated, there is an inspiratory wave due to rebreathing of CO2, the height of the capnogram is gradually increasing.

Inspiration

CO2absorbentexhr.gif

Details

Inspiratory valve defects
The inspiratory valve is not closing properly resulting in a flip in the plateau at the beginning of inspiration.
Note inspiration shown as red.

inspflip.gif

Inspiratory valve malfunction - valve displaced or totally incompetent- note rebreathing
during inspiration as red

valvedefect1.gif

Details

 

Expiratory valve defects
Prolonged phase II, slanting of descending limb of inspiration, baseline elevation

valveexp.gif

Details

Metabolic capnograms

Malignant Hyperpyrexia

The height of the capnograms is increased. Baseline at zero until soda lime exhaustion.



MH.gif
Hypothermia/reduced metabolism
The height of the capnograms is decreased.

hypothermia.gif

 

Cardiac output and capnograms

COETCO2fall.gif

Details 

 

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