Intravenous Fluid Administration's Effect on Pediatric Lumbar Puncture

Lumbar Puncture is a common procedure performed in the Pediatric Emergency Department. This procedure is often performed to assess the cerebrospinal fluid for infection. At Children's of Alabama, approximately 75% of patients undergoing this procedure are ages 3 months of age or younger. There is hypothesis that intravenous fluid administration prior to performing a lumbar puncture in this age group will increase the chances of obtaining non-bloody spinal fluid in less attempts.

A recent study by Rankin et al, infants 0 to 3 months with the diagnosis of pyloric stenosis in a pediatric emergency department were enrolled. This study measured the subarachnoid space in millimeters squared before and 1 hour after administration of normal saline intravenous fluid bolus with the use of ultrasound. The sample size was 40 patients with a mean age of 11.3 days. The study determined that fluid boluses were not associated with a significant increase in the sonographic measurement of the subarachnoid space. However, no lumbar punctures were actually performed in their study. Based on their results, they deduced that fluids may not increase lumbar puncture success rates. No studies have been published evaluating whether intravenous fluids affect the success rate of performed lumbar punctures.

A prospective randomized control trial will be performed with patients of the ages 0 to 3 months. Patients to be enrolled will be all patients 3 months or less in the Children's of Alabama Pediatric Emergency Department who will be undergoing a lumbar puncture procedure as part of their clinical work-up. The control arm will have the lumbar puncture performed in routine fashion without the administration of intravenous fluids prior to procedure. The experimental arm will undergo normal saline intravenous fluids (20 milliliters/kilogram) prior to lumbar puncture. The bolus is to be completed prior to performing the lumbar puncture in the experimental group.

Physicians and Nurse Practitioners caring for patients who are performing a lumbar puncture as part of their clinical work-up are responsible for identifying the patient as a candidate for the study. The providers identifies if patients in the age group are a candidate for enrollment based on inclusion and exclusion criteria.

If the patient is identified to be an acceptable candidate for the study, the provider caring for the patient notifies a physician in the Emergency Department who is qualified to obtain consent for the study. Consents are available in both English and Spanish. Once consent is obtained, providers obtain a sealed packet that contains a randomized assignment into one of the arms of the study. If the patient is assigned to the experimental arm, the provider orders a 20 mL/Kg normal saline intravenous fluid bolus and performs the lumbar puncture after the bolus has completed. If the patient is assigned to the control arm, the provider proceeds with the lumbar puncture without ordering or administering intravenous fluids.

After the lumbar puncture is completed, the provider performing the lumbar puncture fills out a brief data collection form that is kept within the randomization packet. This data form collects information that is not routinely documented within the electronic medical record including medical record number, arm of study (experimental vs control), training level of provider that performed each attempt, specialty of provider that performed each attempt, position of patient during each attempt, and on which attempt, if any, CSF was obtained. These data forms are routinely collected. Chart review is performed using medical record numbers from the data collection form to collect additional information into a de-identified excel data sheet. Data obtained from chart review includes age of patient, gestational age, weight, gender, ethnicity, preferred language, duration from intravenous fluid bolus to collection of cerebrospinal fluid, cerebrospinal fluid appearance, training level of provider who performed the first attempt and final attempt, total number of attempts, position of patient during lumbar puncture, number of red blood cells in cerebrospinal fluid, number of white blood cells in cerebrospinal fluid, protein count in cerebrospinal fluid, glucose in cerebrospinal fluid, additional testing, and reasoning for lumbar puncture.