Splanchnic perfusion during controlled hypotension with haemodilution under isoflurane anaesthesia in elderly patients.

Abstract:

:We investigated the effects of controlled hypotension with haemodilution under isoflurane anaesthesia on splanchnic perfusion in elderly patients. We determined the intramucosal pH using gastric tonometry in 28 patients scheduled for hip surgery. Patients without cardiac disease were assigned to two groups according to age. Group A (adult patients, n = 14) included patients aged less than 60 years (range 29-58 years, 47 +/- 11 years, mean +/- SD) and group B (elderly patients, n = 14) more than 65 years (68-78 years, 72 +/- 5 years). Anaesthesia was maintained with N2O-O2-isoflurane. After induction of anaesthesia, haemodilution was produced by drawing 800-1000 mL of blood and replacing it with the same amount of hydroxyethyl starch. Final haematocrit values were 23-24% in all groups. Controlled hypotension was induced with prostaglandin E1 (PGE1) and mean blood pressure was maintained at approximately 60 mmHg for approximately 80 min. Measurements, including gastric intramucosal pH (pHi), arterial blood pH (pHa) and serum lactate were measured before haemodilution (T0), after haemodilution (T1), 80 min after starting hypotension (T2), 60 min after recovery from hypotension (T3) and on the 1st post-operative day (T4). The values of pHa and lactate showed no change in the groups throughout the time course. The gastric pHi values showed significant decreases from 7.418 +/- 0.035 to 7.334 +/- 0.024 (P < 0.05) in group A and from 7.428 +/- 0.029 to 7.320 +/- 0.039 (P < 0.05) in group B after haemodilution, while no further decreases were found at 80 min after starting the hypotension (7.329 +/- 0.038 in group A and 7.322 +/- 0.031 in group B) and 60 min after recovery from hypotension (7.331 +/- 0.029 in group A and 7.328 +/- 0.034 in group B). It can be concluded that moderate haemodilution under isoflurane anaesthesia might impair splanchnic perfusion in adult and elderly patients. The addition of controlled hypotension with PGE1 or an increase in age did not further impair splanchnic perfusion nor the splanchnic oxygen supply.

journal_name

Eur J Anaesthesiol

authors

Fukusaki M,Nakamura T,Hara T,Fukushima H,Hasuo H,Sumikawa K

doi

10.1046/j.1365-2346.1999.00531.x

subject

Has Abstract

pub_date

1999-08-01 00:00:00

pages

519-25

issue

8

eissn

0265-0215

issn

1365-2346

journal_volume

16

pub_type

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