Hypotension Clinical Trial
Official title:
The Effect of Intravascular Preload on Bladder Retention Volume During Spinal Anesthesia Induced Detrusor Blockade
The purpose of this study is to assess the influence of different fluid infusions on the quantity of bladder retention after spinal anesthesia. This study should determine if this increase in bladder retention is significant and relevant.
Background of the study:
Spinal anesthesia , through interruption of spinal nerve conduction, causes intense blockade
of sensation, motor function as well as (para)sympathetic function. Loss of sympathetic tone
causes vasodilation which may lead to arterial hypotension and bradycardia. To avoid these
effects, in anesthetic practice, usually intravenouspreload is administered as cristalloids
or colloids. The form and dosage of these plasma expanders will influence diuresis during
spinal anesthesia-induced detrusor blockade. Excess diuresis may cause bladder distension
and neccecitates bladder catheterization
Objective of the study:
To compare the quantitative effects of Ringer Lactate and HES 6% on diuresis during spinal
anesthesia-induced detrusor blockade as well as prevention of hypotension and vasopressor
use.
Study design:
Before spinal anesthesia is performed, patients are randomized into one of the 3 study
groups (no preload, preload with Ringers' Lactate 14 ml/kg, preload with HES 6% 7 ml/kg).
Spinal anesthesia is administerd with lidocaine 2% 70mg. Hypotension is treated with
vasopressors, atropine or additional intravenous fluid. Bladder scans will be performed on
the recovery unit and day-case unit. Total urinary volume is measured until sensory function
at dermatome S2/3 is restored and spontanous voiding is possible.
Study population:
ASA 1-2 patients who present for spinal anesthesia for minor surgery on the lower
extremitiy. Age 18-60 years.
Intervention (if applicable):
Prespinal administration of intravenous Ringers' Lactate 14 ml/kg or HES 6% 7 ml/kg.
Primary study parameters/outcome of the study:
Primary outcome is total urinary volume during spinal induced detrusor blockade, and number
of subjects that have a bladdder volume over 500ml.
Secundary study parameters/outcome of the study (if applicable):
Secondary outcome parameters:
Periods of hypertension, and total dose of vasopressor en extra fluid administration.
Nature and extent of the burden and risks associated with participation, benefit and group
relatedness (if applicable):
Except for extra bladderscan and block height measurements, all actions are part of routine
anesthesiologic care.
Ga naar boven
;
Allocation: Randomized, Intervention Model: Parallel Assignment, Masking: Double Blind (Caregiver, Investigator, Outcomes Assessor)
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