Biology Reference
In-Depth Information
Pulmonary aeration
90
NS Group
Group
80
S
70
60
50
%
40
30
20
10
0
Atelectasis
Poorly Aerated
Normally Aerated
Hyperinflated
Fig. 24.1 Percentage of the lung compartments in 20 dogs under general anesthesia. The S group
includes dogs ( n
10) that underwent surgery before the CT scan, the NS group include dogs
¼
( n
10) that did not undergo surgery before the CT scan; * P
0.05 (one-way ANOVA)
¼
<
level of anesthesia, abdominal compression, water loss, and bleeding related to the
surgical procedures. Several experimental and clinical studies demonstrated that
cardiac output might interfere with the percentage of the intrapulmonary shunt. In
particular, lower cardiac outputs, within certain limits, reduce the intrapulmonary
shunt improving patient oxygenation (Lynch et al. 1979 ).
Pulmonary atelectasis not only interferes with respiratory mechanics and gas
exchange but can also be associated with postoperative pulmonary complications
characterized by the permanence of gas-exchange impairment and the development
postoperative pulmonary infections (Duggan and Kavanag 2005 ). Based on the
results of this study, abdominal surgery promotes pulmonary atelectasis formation,
and thus, the use of PEEP and lung-recruitment maneuvres is recommended to
preserve lung aeration during abdominal surgery (Staffieri et al. 2009 , 2010 ).
References
Duggan M, Kavanag BP (2005) Pulmonary atelectasis: a pathogenic periopertaive entity. Anes-
thesiology 102:838-854
Hedenstierna G (2003) Alveolar collapse and closure of airways: regular effects of anaesthesia.
Clin Physiol Func Im 23:123-129
Search WWH ::




Custom Search