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Chest. 1998 May;113(5):1335-8.

Effects of tracheal suctioning on respiratory resistances in mechanically ventilated patients.

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1
Département d'Anesthésie et de Réanimation Chirurgicale, Hôpital Bichat, Paris, France.

Abstract

OBJECTIVE:

To evaluate the effects of tracheal suctioning (TS) on respiratory resistances in sedated critical care patients receiving mechanical ventilation (MV).

SETTING:

Surgical ICU of Bichat Hospital, Paris.

PATIENTS AND PARTICIPANTS:

Thirteen sedated critical care patients receiving MV for various conditions.

MEASUREMENTS AND RESULTS:

Airway resistances (R1), airway and pulmonary resistances (R2), and intrinsic positive end-expiratory pressure (PEEPint) were measured according to the end-inspiratory and end-expiratory occlusion methods before and after TS. R1 and R2 increased by 49.1% and 46.3%, respectively, 0.5 min after TS (p<0.01) but returned to baseline values at 1 min without any change thereafter. PEEPint decreased progressively following TS to reach a significant level (-13.3%) at 10 min (p<0.05) and was persistently reduced at 30 min (p<0.01). Nine patients received 500 microg of inhaled albuterol before another suctioning procedure. R1 and R2 decreased by 11.5% and 9.9%, respectively, 20 min after inhalation (p<0.05), but the R1 and R2 initial increase following TS did not differ between the two suctioning procedures.

CONCLUSIONS:

TS evokes only a transient bronchoconstrictor response, but thereafter, does not reduce respiratory resistances below presuctioning values. However, the decrease of PEEPint following TS suggests an increase of expiratory flow. Effective beta2-adrenergic receptor blockade fails to suppress the TS-induced bronchoconstrictor response.

PMID:
9596316
[Indexed for MEDLINE]
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