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Brain Natriuretic Peptide Concentrations After Aneurysmal Subarachnoid Hemorrhage: Relationship with Hypovolemia and Hyponatremia.
MedLine Citation:
PMID:  21286856     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Hyponatremia and hypovolemia occur often after aneurysmal subarachnoid hemorrhage (SAH) and are associated with poor outcome. The authors investigated whether brain natriuretic peptide (BNP) is related to hypovolemia and hyponatremia after SAH and whether it can differentiate between hypovolemic and non-hypovolemic hyponatremia. METHODS: In 58 SAH patients, the authors daily measured serum BNP and sodium concentrations, and circulating blood volume by means of pulse dye densitometry, during the initial 10 days. For each patient, mean BNP concentrations were calculated until occurrence of the following events: hyponatremia (Na <130 mmol/l), hypovolemia (blood volume <60 ml/kg), and severe hypovolemia (blood volume <50 ml/kg). The median day of onset of each event was calculated. In patients without an event, the authors calculated and used for comparison the mean BNP concentration until the median day of onset of the particular event. Odds Ratio's (OR) for high versus low mean BNP concentrations (dichotomized on median values per event) were calculated for the occurrence of each event and adjusted for relevant baseline characteristics. RESULTS: Patients with BNP above median more often had severe hypovolemia (adjusted OR 4.2, 95% confidence interval, CI 1.2-15.0) and showed a trend toward hyponatremia (adjusted OR 3.3, 95% CI 0.7-9.2). In the 12 hyponatremic patients, BNP could not differentiate between hypovolemic and non-hypovolemic hyponatremia. CONCLUSIONS: High BNP concentrations are related to the occurrence of severe hypovolemia and possibly hyponatremia. These data do not support a role for BNP measurements to differentiate between hypovolemic and non-hypovolemic hyponatremia in SAH patients.
Authors:
Sanne M Dorhout Mees; Reinier G Hoff; Gabriel J E Rinkel; Ale Algra; Walter M van den Bergh
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-1
Journal Detail:
Title:  Neurocritical care     Volume:  -     ISSN:  1556-0961     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-2-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101156086     Medline TA:  Neurocrit Care     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Neurology, Rudolf Magnus Institute of Neuroscience, University Medical Center Utrecht, Room G03.228, P. O. Box 85500, 3508, Utrecht, The Netherlands, s.m.dorhoutmees@umcutrecht.nl.
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