Abstract
Purpose
The use of lung ultrasound (LUS) to identify extravascular lung water has received increasing acceptance. Sonographic B-lines, discrete vertical lines that originate from the pleura, represent pulmonary edema and are correlated with the accumulation of fluid. The goal of this study was to evaluate the utility of LUS to determine the accuracy of prescribed dry weight (DW) in chronic hemodialysis (HD) patients and to ascertain the adequacy of fluid removal.
Methods
LUS was scheduled to be performed pre- and post-HD in 20 patients. The HD prescription and DW challenge were done independent of the results of the LUS. The presence of B-lines was tabulated and compared to the intradialytic ultrafiltration parameters.
Results
Of the 20 patients, 3 did not exhibit B-lines at the first dialysis session. In regard to the other 17 patients, B-lines disappeared in 7 patients at the end of the HD session (mean B-lines 4.2–0). One patient was 0.3 kg away from the prescribed dry weight, but the 6 patients were a mean of 1.7 kg below DW. Of the remaining 10 patients, eight decreased but did not eliminate the B-lines (mean B-lines 15.5–3.8) and were a mean of 3.8 kg below DW post-HD. Two patients who exhibited more cardiac insufficiency than initially recognized could not reach DW or eliminate the B-lines. Eight patients who had residual B-lines at the end of the first HD session had their DW re-estimated and had a second session. Two were able to eliminate the B-lines (mean 2.5–0) and reached a mean of 1.2 kg below DW. Six did not eliminate the B-lines (mean 11.5–4.2) but were able to reach a mean of 0.6 kg below DW. Correlation analysis showed a statistically significant correlation (P < 0.05) between the intradialytic percent change in B-lines and the percent change in total body weight (r = 0.40) and ultrafiltration rate (r = 0.33). Seven of 10 patients with clear chest X-rays pre-HD exhibited B-lines.
Conclusions
This study supports the hypothesis that reduction in B-lines during HD can provide accurate information regarding changes in pulmonary fluid content. Further, LUS is a valuable diagnostic tool for recognizing both the adequacy of fluid removal and the occurrence of error in the estimation of dry weight by usual clinical parameters.
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Abbreviations
- BIA:
-
Bioimpedance analysis
- BIS:
-
Bioimpedance spectroscopy
- BVM:
-
Blood volume monitoring
- CXR:
-
Chest X-ray
- DW:
-
Dry weight
- EDW:
-
Estimated dry weight
- ESRD:
-
End-stage renal disease
- HD:
-
Hemodialysis
- LUS:
-
Lung ultrasound
- NYHA:
-
New York heart association
- UF:
-
Ultrafiltration
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Acknowledgements
This study was performed with the support of our biostatistics department and our hemodialysis unit nursing staff. We wish to thank Mr. Guillaume Stoffels MA, MS. His assistance with the study design and statistical analysis was invaluable. We also thank Marlyn A. Batan RN, BSN, CNN, nurse manager of our dialysis unit for her enthusiastic efforts.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Review Board of Northwell Health and with the Declaration of Helsinki.
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Written informed consent was obtained from all individual participants included in the study.
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Jiang, C., Patel, S., Moses, A. et al. Use of lung ultrasonography to determine the accuracy of clinically estimated dry weight in chronic hemodialysis patients. Int Urol Nephrol 49, 2223–2230 (2017). https://doi.org/10.1007/s11255-017-1709-5
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DOI: https://doi.org/10.1007/s11255-017-1709-5