Study Design
This study is designed to be a prospective, single-blinded, randomized controlled trial at Oregon Health and Science University (OHSU) in Portland, Oregon. The investigators will enroll Hispanic and non-Hispanic parturients in equal numbers on the labor and delivery floor to receive both an educational pamphlet and video in their primary language or no educational intervention. All parturients will receive standard of practice consent for general/regional anesthesia by an anesthesiology resident or attending.
Study Population
A total of 176 participants will be enrolled in the study. Within the 176 participants there will be four groups of patients: (1) Hispanic subjects that receive additional epidural education \[44 patients\], (2) Hispanic subjects that receive standard of care \[44 patients\], (3) non-Hispanic subjects that receive additional epidural education \[44 patients\], and (4) non-Hispanic subjects that receive standard of care \[44 patients\].
Over the past year 421 Hispanic and 215 non-Hispanic patients with Medicaid insurance delivered at OHSU. The rate-limiting step in the study will be enrolling enough non-Hispanic subjects on Medicaid and so study timeline calculations are based upon expected enrollment of those subjects. Assuming 15% of patients approached decline study participation and the research team misses another 35% of patients the investigators believe they can enroll the necessary 88 subjects in 300 days or approximately 10 months (during which time 177 non-Hispanic Medicaid deliveries would occur).
Patients appropriate for inclusion in the study will be identified at OHSU after they have been admitted to the labor and delivery unit. A cursory review of the labor and delivery unit census on EPIC will be used to identify qualifying patients (ASA I-III category patients of 18 years of age on Medicaid with that are either in labor or committed to labor via induction). All patients who pass this initial screen with have a more thorough review of their record with particular attention paid to ethnicity and medical conditions that would affect the decision to offer neuraxial analgesia.
Setting
Informed consent, Initial Encounter survey, and Epidural Pre-Test Questionnaire will be administered in the OHSU Labor and Delivery Unit. The Epidural Post-Test Questionnaire will be administered in the patient's recovery room 1-2 days after giving birth.
Recruitment Methods
Patients that appear to meet inclusion criteria will be identified at OHSU after they have been admitted to the labor and delivery unit. A cursory review of EPIC on the work computers of the researchers or labor and delivery unit computers will be used to identify patients that warrant a deeper chart review (ASA I-III category patients of at least 18 years on Medicaid that are either in labor or committed to labor via induction). All patients that pass this initial screen will have a more thorough review of their medical record with particular attention paid to ethnicity, whether they are an MD or midwife patient, and medical conditions that may affect the decision to offer neuraxial anesthesia. All patients that pass this EPIC screen will be approached by the research team and allowed to participate in the study. There will be no fliers, advertisements, videos, or webpages set up to recruit patients. There will be no monetary awards or free services offered to study participants.
Consent Process
A member of the research team will perform subject recruitment and obtain written informed consent in the OHSU Labor and Delivery Unit in order to minimize the possibility of coercion.
Patients will be provided the Consent and Authorization form in their preferred language (English or Spanish) and will have an opportunity to ask questions of the research team member after the study protocol is explained. An interpreter/translator will be available via telephone for Spanish speaking women during this time.
Procedures
Subject allocation will occur in the labor room after informed consent has occurred. Allocation will occur when the research assistant opens one of a series of sequentially numbered opaque envelopes containing group assignment (by a computer generated random number sequence \[Excel, Redmond WA\]. A researcher not involved in either subject enrollment or subject assignment will generate the random number sequence. The anesthesia and obstetric team caring for the subject will remain blinded on whether the subject received additional educational materials; however, due to the type of study it is impossible to blind the subject. Subjects will be allocated to either an epidural-focused educational intervention or no intervention by ethnicity stratified block randomization.
Subjects that agree to participate in the study will have demographic data collected from EPIC (age, race, gravida, parity, gestational age, BMI, birth history) and will be given a subject questionnaire in their primary language that will ask about potential confounders that may affect epidural usage (highest education achieved, length of time the subject's family has lived in the U.S., past personal and family experience with epidurals, needle phobia, etc.). At the conclusion of the study some additional information will be taken from EPIC (length of labor, type of delivery, APGAR scores, and whether an epidural was used for labor analgesia).
All subjects enrolled in the study will be given a survey in their primary language seeking to identify potential barriers to neuraxial anesthesia utilization. Included in this survey will be a yes/no checklist for the subject to complete that includes some previously published reasons that patients commonly give for not wanting neuraxial anesthesia. This survey will be given again in the postpartum period to all women enrolled in the study. The postpartum survey will serve as a post-test to evaluate the effectiveness of the educational intervention in those women that received additional education materials. The post-test will also be given to women in the control group to determine if the process of delivering a baby either with or without an epidural affects subject views on neuraxial anesthesia. The completion of the posttest will mark the end of each parturient's time of participation in the study.
All women allocated to receive additional educational materials will be given a language appropriate pamphlet and video on neuraxial anesthesia. The video and pamphlet will be in the subject's primary language. After the subject watches the educational video they will be given an opportunity to go through the pamphlet with the research assistant and ask any questions they may have. For Spanish-speaking subjects this will occur through a telephone interpreter. The obstetric anesthesia providers and obstetricians caring for the subject will be absent for the educational video and post-video conversation.
Women who elect to receive neuraxial anesthesia will be administered the procedure by an anesthesiology resident with supervision by an attending anesthesiologist. A lumbar epidural catheter will be placed and after initial bolus (spinal or epidural) all subjects will be started on a patient-controlled epidural analgesia (PCEA) protocol with a solution of 0.055% bupivacaine with 1 mcg/mL sufentanil. The initial PCEA settings for all subjects will be the following: maintenance infusion rate of 10 ml/hr, bolus of 5 ml, lockout of 15 minutes, with a maximum of 4 boluses an hour. The maintenance infusion rate, bolus volume, and lockout interval will be allowed to be adjusted as deemed necessary by the obstetric anesthesiology team. Subjects with pain refractory to the initial PCEA settings will be allowed to get additional epidural boluses of medication by the anesthesiology resident or attending. The PCEA will be continued until delivery or slightly thereafter depending upon subject need. The PCEA will be allowed to be turned off or down to help with stage two pushing or to avoid maternal hypotension. Other more rare complications involving neuraxial anesthesia will be dealt with according to standard of care practice.
Data Analysis
Sample size calculations are based upon the abstract presented at the Society for Maternal-Fetal Medicine. In that study, only 40% of women assigned to additional prenatal epidural education classes attended the prescribed intervention. With 40% attendance the authors of the study found a 14% difference in epidural utilization rates. Subjects in this study will be randomized on labor and delivery after hospital admission. The investigators estimate that 90% of women will get the assigned educational intervention. Assuming epidural education has the same effect in this study as that seen in the abstract by Kanter et al. the investigators expect to see a 31% increase in epidural utilization. Based upon data at OHSU from June 2013 to May 2014 the current epidural rate at OHSU for Hispanics is 45.3% and the current epidural rate for non-Hispanics is 55.8%. Assuming a 31% difference in epidural usage in the Hispanic population after implementation of the study protocol, with an alpha of 0.05 and a power of 80%, 44 subjects would need to be randomized to each of four groups.
The investigators will compare the intervention to control group within both the Hispanic and non-Hispanic populations on the primary outcome of neuraxial anesthesia utilization using the chi-squared statistic. Pre and post delivery scores from the Neuraxial Anesthesia Survey will be compared using the Wilcoxon signed-rank test. Subject characteristics between study arms will be compared to one another with the chi-squared statistic or Fisher's Exact Test for categorical outcomes and the student t test, or a non-parametric equivalent, for continuous variables. A p \< 0.05 will be required to reject the null hypothesis that no difference between epidural utilization rates exists between those that received the educational intervention and those that did not.
