Effects of short-term 28% and 100% oxygen on PaCO2 and peak expiratory flow rate in acute asthma: a randomized trial.

Abstract:

STUDY OBJECTIVE:We conducted the first randomized controlled study to assess the effects of short-term 28% and 100% oxygen on PaCO(2) and peak expiratory flow rate (PEFR) in patients with acute severe asthma. PATIENTS AND INTERVENTIONS:Seventy-four patients (mean age, 37.9 +/- 9.7 years [+/- SD]; PEFR, 41.0 +/- 12.1% of predicted) from two emergency departments were randomized to receive 28% or 100% oxygen during 20 min. RESULTS:The administration of 100% oxygen significantly increases PaCO(2) (p = 0.03) and decreases PEFR (p = 0.001) as compared with administration of 28% oxygen. PaCO(2) before and during oxygen administration correlated significantly (p = 0.001) in both groups. Patients breathing 28% oxygen experienced a PaCO(2) fall; on the contrary, patients who received 100% oxygen showed an increase in PaCO(2), particularly those with PaCO(2) before oxygen treatment > 40 mm Hg. CONCLUSIONS:This study confirmed previous observations that oxygen dose should be variable and based on achieving and maintaining target arterial oxygen saturation measured by pulse oximetry > or = 92% rather than on prescribing predetermined concentrations or flow rates of inspired oxygen.

journal_name

Chest

journal_title

Chest

authors

Rodrigo GJ,Rodriquez Verde M,Peregalli V,Rodrigo C

doi

10.1378/chest.124.4.1312

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

1312-7

issue

4

eissn

0012-3692

issn

1931-3543

pii

S0012-3692(16)48673-3

journal_volume

124

pub_type

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