Some of the saline has been observed to reside in the lungs. It is
thought that the normal saline that accumulates in the base of the
lung will decrease both the diameter of the airway and the amount of
gas exchange in the lungs. In this systematic review, oxygen saturation
after NSI was determined to be lower than the values observed before
suctioning in most studies that report the impact of NSI on oxygenation
[22-24,28]. In all studies except for the study performed by Akgül and
Akyolcu [27], this difference was demonstrated to be statistically signifi-
cant [22-24,28]. These results are also consistent with previous studies
[32,33]. Therefore, although nurses believe that secretions are thinned
with NSI and are easily removed, a large portion of the normal saline applied
to the airway remains in the right lung. This situation negatively
affects the patient's oxygenation.
The impact of NSI on hemodynamics is an important parameter. In
this systematic review, some studies demonstrated that the heart rate
increases after suctioning with NSI [27] and that the application of saline
does not significantly increase the heart rate [23,24]. Similar studies in
the literature indicated that NSI either affects hemodynamics [32,33]
or does not cause a significant change [6]. Therefore, the hemodynamic
impact of NSI remains controversial.
Some of the saline has been observed to reside in the lungs. It isthought that the normal saline that accumulates in the base of thelung will decrease both the diameter of the airway and the amount ofgas exchange in the lungs. In this systematic review, oxygen saturationafter NSI was determined to be lower than the values observed beforesuctioning in most studies that report the impact of NSI on oxygenation[22-24,28]. In all studies except for the study performed by Akgül andAkyolcu [27], this difference was demonstrated to be statistically signifi-cant [22-24,28]. These results are also consistent with previous studies[32,33]. Therefore, although nurses believe that secretions are thinnedwith NSI and are easily removed, a large portion of the normal saline appliedto the airway remains in the right lung. This situation negativelyaffects the patient's oxygenation.The impact of NSI on hemodynamics is an important parameter. Inthis systematic review, some studies demonstrated that the heart rateincreases after suctioning with NSI [27] and that the application of salinedoes not significantly increase the heart rate [23,24]. Similar studies inthe literature indicated that NSI either affects hemodynamics [32,33]or does not cause a significant change [6]. Therefore, the hemodynamicimpact of NSI remains controversial.
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