Document Detail

Automatic control of blood volume trends during hemodialysis.
MedLine Citation:
PMID:  8555549     Owner:  NLM     Status:  MEDLINE    
Dialysis induced hypovolemia plays an important role in triggering intradialytic hypotension. The authors developed an automatic system (BVAC) with feedback changes in the ultrafiltration rate (UFR) and dialysate conductivity (DC) to match blood volume (BV) intradialytic profiles with the desired trajectories. The system consists of three subunits: (1) an optical probe to continuously detect the BV changes derived from hemoglobin changes, and (2) a dialysis machine interfaced with (3), a personal computer in which a time-dependent model is implemented. The model is based on a dynamic regulator that can set the actual BV changes against the corresponding desired values. Any discrepancy is offset by changes in UFR and DC. To verify the efficacy of the BVAC system in reducing intradialytic cardiovascular instability, five hypotension-prone patients were studied during a three period protocol (A1-B-A2) that lasted six sessions per period per patient. During periods A1 and A2, the dialysis procedure was conventional hemodialysis (HD) with linear UFR and constant DC. During period B, both UFR and DC were automatically regulated by the BVAC system. Mean BV reduction and its variability were lower during period B than during periods A1 and A2 (-10.2%, -11.3%, and -11.5, respectively). Episodes of hypotension were significantly (P < 0.05) fewer during period B (n = 1) than during periods A1 (n = 8) and A2 (n = 5). The therapeutic interventions defined as infused milliliters of isotonic and hypertonic solution were fewer during period B compared with periods A1 and A2. Total UF and end-dialysis plasma sodium concentrations did not differ in the three study periods. BVAC was effective in improving cardiovascular tolerance to treatment.
A Santoro; E Mancini; F Paolini; M Spongano; P Zucchelli
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  ASAIO journal (American Society for Artificial Internal Organs : 1992)     Volume:  40     ISSN:  1058-2916     ISO Abbreviation:  ASAIO J.     Publication Date:    1994 Jul-Sep
Date Detail:
Created Date:  1996-02-26     Completed Date:  1996-02-26     Revised Date:  2006-05-23    
Medline Journal Info:
Nlm Unique ID:  9204109     Medline TA:  ASAIO J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  M419-22     Citation Subset:  IM    
Malpighi Nephrology and Dialysis Department, Policlinico S. Orsoli-Malpighi, Bologna, Italy.
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MeSH Terms
Blood Volume*
Electric Conductivity
Hemodialysis Solutions
Hypotension / etiology,  prevention & control
Middle Aged
Renal Dialysis / adverse effects,  instrumentation*,  methods
Reg. No./Substance:
0/Hemodialysis Solutions

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