Ramírez VMS, Morales PII, Hernández PJL, Salazar SS

Language: Spanish
References: 8
Page: 409-415
PDF size: 259.25 Kb.

ABSTRACT

Introduction: The standard in intensive care units is to compute the water balance. In the Central Military Hospital, we have bioimpedance, a technological resource that has proven reproducibility and validity in ambulatory patients; however, no literature has been published regarding critically ill patients. We aim to verify the concordance between extracellular water reported by bioimpedance and water balance; if there is such, it will be used as a guide to manage the hydration status without the inconvenience of waiting hours to compute a water balance. Objectives: To determine the concordance between the water balance report measured by bioimpedance and the calculated water balance. Material and methods: Serial bioimpedance measurements were performed on the patients admitted in the ICU of the Central Military Hospital during the study; we compared the calculated water balance report and the bioimpedance report, applied the kappa index and Bland-Altman proof to determine the concordance between the two measurements. Results: There is a coincidence between water balance and bioimpedance. The kappa index was 0.3366 (Z = 5.1235 and p ‹ 0.05); therefore, statistically and qualitatively, bioimpedance has a moderate coincidence with water balance. The positive predictive index is 83.21. The negative predictive value is 88.89. The Bland-Altman method shows that in 100 measurements, 97 will have some coincidence between bioimpedance and calculated water balance: in 66%, it will be high; in 21%, medium; in 10%, poor. Conclusion: Bioimpedance is a non-invasive, validated method that is easy to perform and allows to obtain important and accurate information regarding body composition, nutritional state and the hydric state in healthy people, sick ones and critically-ill patients; it is low-cost and easy to use.

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