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Br J Anaesth. 2012 May;108(5):872-5. doi: 10.1093/bja/aer510. Epub 2012 Feb 8.

Accuracy of respiratory rate monitoring using a non-invasive acoustic method after general anaesthesia.

Author information

1
Centre Hospitalier Universitaire de Poitiers, 2 rue de la Milétrie, Poitiers, France. o.mimoz@chu-poitiers.fr

Abstract

BACKGROUND:

Respiratory rate should be monitored continuously in the post-anaesthesia care unit (PACU) to avoid any delay in the detection of respiratory depression. Capnometry is the standard of care but in extubated patients requires a nasal cannula or a face mask that may be poorly tolerated or can be dislodged, leading to errors in data acquisition and false alarms. The value of a new non-invasive acoustic monitor in this setting has not been fully investigated.

METHODS:

Adult patients admitted to the PACU after general anaesthesia were included. After tracheal extubation, an adhesive sensor with an integrated acoustic transducer (RRa™) was placed on the patient's throat and connected to its monitor while the patient breathed through a face mask with a carbon dioxide sampling port (Capnomask™) connected to a capnometer. Both the acoustic monitor and the capnometer were connected to a computer to record one pair of data per second for up to 60 min.

RESULTS:

Fifty-two patients, mean (range) age 54 (22-84) yr and BMI 26 (19-39) kg m(-2), were studied. Compared with capnometry, the bias and limits of agreement of the acoustic method were 0 (-1.4-1.4) bpm. The acoustic sensor was well tolerated while the face mask was removed by eight patients, leading to study discontinuation in two patients.

CONCLUSIONS:

In extubated patients, continuous assessment of respiration rate with an acoustic monitor correlated well with capnometry.

PMID:
22323525
DOI:
10.1093/bja/aer510
[Indexed for MEDLINE]
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