Evaluation of a transcutaneous carbon dioxide monitor in severe obesity.

Abstract:

OBJECTIVE:To determine the reliability of estimating arterial CO(2) pressure (PaCO(2)) using a recently introduced transcutaneous CO(2) pressure (PtcCO(2)) monitor in severe obese patients. DESIGN:Observational and interventional study. SETTING:District hospital with respiratory ward and bariatric surgery unit. PATIENTS AND METHODS:PtcCO(2) was measured in 35 obese patients with varied pathology, including chronic obstructive pulmonary disease, obstructive sleep apnea syndrome and hypoventilation syndrome. Ten minutes after the probe had been attached to an earlobe, PtcCO(2) was recorded immediately before arterial blood sampling. The PtcCO(2) and PaCO(2) values obtained with two methods were compared by Bland-Altman analysis. In a subgroup of 18 obese patients with chronic obstructive pulmonary disease and/or obstructive sleep apnea syndrome with moderate to severe hypercapnia both PtcCO(2) and PaCO(2) were re-evaluated during continuous positive airways pressure (CPAP) or bi-level positive airway pressure (Bi-PAP) treatment. RESULTS:The mean difference between PaCO(2) and PtcCO(2) was -1.4 mmHg, and the standard deviation of the difference was 1.3 mmHg. Bland-Altman analysis showed generally good agreement between the two methods with a 95% limit of agreement of -4 to 1.1. The agreement between methods did not significantly change before and during cPAP or Bi-PAP treatment in hypercapnic patients. CONCLUSIONS:The accuracy of estimation of PaCO(2) by transcutaneous monitoring was generally good in comparison with standard arterial blood gases examination. The device appears to be promising for use in obese patients to evaluate abnormalities in their alveolar ventilation.

journal_name

Intensive Care Med

journal_title

Intensive care medicine

authors

Maniscalco M,Zedda A,Faraone S,Carratù P,Sofia M

doi

10.1007/s00134-008-1078-8

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

1340-4

issue

7

eissn

0342-4642

issn

1432-1238

journal_volume

34

pub_type

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