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How to perform indexing of extravascular lung water: a validation study.

Abstract：

BACKGROUND:Extravascular lung water is a quantitative marker of the amount of fluid in the thoracic cavity besides the vasculature. Indexing to both predicted and actual body weight have been proposed to compare different individuals and provide a uniform range of normal. OBJECTIVE:We explored extravascular lung water measured by single-indicator transpulmonary thermodilution in a large cohort of patients without cardiopulmonary instability, in order to evaluate current and alternative indexing methods. DESIGN:Prospective, observational. SETTING:Neurosurgical ICU in a tertiary referral academic teaching hospital. PATIENTS:One hundred and one consecutive patients requiring elective brain tumor surgery and postoperative ICU surveillance. INTERVENTIONS:None. MEASUREMENTS AND MAIN RESULTS:Indexed to predicted body weight, females had a mean extravascular lung water of 9.1 (SD=3.1, range: 5-23) mL/kg and males of 8.0 (SD=2.0, range: 4-19) mL/kg (p<0.001). Values indexed to predicted body weight were inversely correlated with the patient's height (p<0.001). Indexed to the traditionally used actual body weight, data showed a significant relationship to weight (p<0.001) and gender (p<0.05). In contrast, indexing to body height presented a method without dependencies on height, weight, or gender, yielding a uniform 95% confidence interval of 218-430 mL/m. Extravascular lung water increased with positive perioperative fluid balance (p=0.04). CONCLUSIONS:Using either predicted or actual body weight for indexing extravascular lung water does not lead to independence of height, weight, and gender of the patient. Specifying a fixed range of normal or a uniform upper threshold for all patients is misleading for either method, despite widespread use. Our data suggest that indexing extravascular lung water to height is superior to weight-based methods. As we are not aware of any abnormal hemodynamic profile for brain tumor patients, we propose our findings to be a close approximation to normal values.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Wolf S,Riess A,Landscheidt JF,Lumenta CB,Schürer L,Friederich P

doi

10.1097/CCM.0b013e318275cd75

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

990-8

issue

eissn

0090-3493

issn

1530-0293

journal_volume

pub_type

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How to perform indexing of extravascular lung water: a validation study.