title: Low baseline proBNP associated with increased risk of intraoperative hypotension during spinal anaesthesia for cesarean delivery.
abstract: OBJECTIVE
  Brain natriuretic peptide (BNP) has a role in the regulation of body fluid volume and blood pressure (BP). BNP remains within a normal range during spinal anaesthesia (SA) in patients undergoing cesarean delivery. However, the effect of BNP on changes in BP during the perioperative period has not been evaluated. We aimed to investigate the effect of preoperative serum BNP on the risk of hypotension during cesarean delivery with SA.
  
  
  METHODS
  Patients were randomly selected among the patient group who were attending routine clinic visits for pregnancy monitoring. All had a healthy pregnancy and no other acute or chronic disease by their obstetrician. The study design was cross-sectional.
  
  
  METHODS
  Patients who had uncomplicated pregnancy process and no known medical dis.ease were selected consecutively during their last outpatient clinical examination. Baseline BP was recorded before SA. Simultaneously, blood samples were drawn for routine biochemistry and BNP. BP, SaO2, and electrocardiography were monitored during surgery. Intraoperative hypotension (IOH) was defined as >=25% decrease in mean arterial pressure (MAP) at the 5th minute of SA.
  
  
  RESULTS
  In 41 term pregnant women, 18 of the 41 patients (43.9%) fulfilled the criteria for IOH, while 23 (56.1%) showed a decrease 13.1 (11.3%) and were classified as normotensive. Baseline BNP was significantly lower in patients with IOH compared with normotensive patients 45.7 (26.9) vs.70.2 (40.5); P=.05. Baseline BNP had no significant correlation MAP at any time point. Age, body mass index, hemoglobin, baseline MAP and heart rate were not different between patients with and without IOH.
  
  
  CONCLUSIONS
  Those findings suggest that higher baseline BNP levels might have a protective role in development of hypotension in healthy term pregnant women during SA for cesarean delivery.
authors.forename: Tayfun
authors.initials: T
authors.lastname: Birtay
authors.affiliation: Gultekin Genctoy MD, Baskent University Faculty of Medicine, Department of Nephrology, Saray mah Yunus Emre cad. No: 1, Alanya/Antalya, Turkey, T: +90-242-5102525/ 2106, F:+90-242-5115720, ggenctoy@hotmail.com.
authors.forename: Gultekin
authors.initials: G
authors.lastname: Genctoy
authors.forename: Tonguç
authors.initials: T
authors.lastname: Saba
mesh_terms: D000328:Adult; D000775:Anesthesia, Spinal / Q000009:adverse effects*; D001794:Blood Pressure; D002585:Cesarean Section / Q000009:adverse effects* / Q000379:methods; D003430:Cross-Sectional Studies; D005260:Female; D006339:Heart Rate; D006801:Humans; D007022:Hypotension / Q000097:blood* / Q000209:etiology; D007431:Intraoperative Complications / Q000097:blood* / Q000209:etiology; D020097:Natriuretic Peptide, Brain / Q000097:blood*; D011247:Pregnancy; D011897:Random Allocation
chemical_list: D020097:Natriuretic Peptide, Brain