Does Ultrasound Help Junior Anesthesia Residents With Placement of Labor Analgesia in Pregnant Patients

Study Results

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Basic Information

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Recruitment Status

TERMINATED

Clinical Phase

NA

Total Enrollment

32 participants

Study Classification

INTERVENTIONAL

Study Start Date

2018-01-29

Study Completion Date

2020-02-24

Brief Summary

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The investigators believe that ultrasound guided CSE technique will help junior resident rotating for the first time on the labor and delivery floor to place more accurately the epidural needle in the midline position as compared to placing the epidural needle via palpation of anatomical landmarks. This will result in increased ability to place the spinal component with positive cerebral spinal fluid (CSF) in the spinal needle, correct midline placement of the epidural catheter, and increase the likelihood of adequate symmetrical labor analgesia/anesthesia.

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Detailed Description

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Epidurals provide superior labor analgesia and anesthesia. Unfortunately, failure of epidural anesthesia and analgesia is a frequent clinical problem. In a heterogeneous cohort of 2,140 surgical patients, a failure rate of 27% for lumbar epidural was described. However, the definition of a failed epidural is broad. Different definitions include insufficient analgesia to catheter dislodgement to conversion to general anesthesia. Epidural analgesia failures may result from technical difficulties, insufficiencies or overdosing of local anesthetics, epidural septum or midline adhesions, and placement of the epidural catheter through an intervertebral foramen or into the anterior epidural space. In an imaging study of failed epidurals, incorrect catheter placement accounted for half of the failures, while the remaining patients experienced suboptimal analgesia through a correctly positioned catheter.

The incidence of overall failure was lower in patients receiving combined spinal-epidural (CSE) catheters versus epidural analgesia. In one study, the CSE technique provided decreased failure rates for labor analgesia and comparable or decreased failure rates for surgical anesthesia, when compared with reported failure rates for epidural anesthesia. It is believed that positive CSF flow in the spinal needle confirms correct epidural needle placement in the epidural space and also confirms the epidural needle to be in the midline position. Placement of the epidural needle in the midline position will minimize the incorrect placement of the catheter to one side, providing a symmetrical analgesia versus unilateral analgesia.

However, the practice of CSE and epidural catheter placement relies on the palpation of anatomical landmarks that are not always easy to feel. Therefore, the epidural needle maybe placed "off midline" despite positive loss of resistance (LOR) that causes negative CSF flow in the spinal needle and an incorrectly placed catheter. As a result, the incorrect catheter placement will result in a "failed" or suboptimal epidural analgesia.

Ultrasound has recently been utilized to facilitate lumbar epidurals and spinals. The US imaging of the lumbar spine in different scanning planes facilitates the identification of the landmarks necessary for appropriate epidural space location in pregnant patients. There are two acoustic windows that are effective for lumbar spine sonographic assessment: one seen on the transverse approach, and the other seen on the longitudinal paramedian approach. The ultrasound single-screen method using the transverse approach of the lumbar spine provides reliable information regarding the landmarks required for labor epidurals. The correct interspace and midline position are identified for correct placement of the CSE analgesia.

A previous study done by the research team, comparing "blind" vs US guidance technique. It did not show any significant difference in term of success rate or complications with either technique. However, the study was done by 4 trained physicians with lot of practice. At this level of training, the investigators did not observe any technique improvement with US. Which is why the investigators thought might have more success in showing an improvement in technique, with junior residents rotating for the first time on the floor. The idea is to see if there is any difference in their learning curve using the US versus the "blind" technique. Each resident will be their own control.

Conditions

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Pregnancy

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

DIAGNOSTIC

Blinding Strategy

NONE

Study Groups

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Ultrasound

Woman requests epidural for pain relief Ultrasound guided CSE placed Continuous epidural infusion started

Group Type ACTIVE_COMPARATOR

Ultrasound

Intervention Type DEVICE

The ultrasound imaging of the lumbar spine in different scanning planes facilitates the identification of the landmarks necessary for appropriate epidural space location in pregnant patients. There are two acoustic windows that are effective for lumbar spine sonographic assessment: one seen on the transverse approach, and the other seen on the longitudinal paramedian approach. The ultrasound single-screen method using the transverse approach of the lumbar spine provides reliable information regarding the landmarks required for labor epidurals. The correct interspace and midline position are identified for correct placement of the CSE analgesia.

Epidural infusion

Intervention Type PROCEDURE

An epidural infusion will be started in both groups, regarding of the technique used for placement, and the same solution of Bupivacaine 0.0625% with 2mcg fentanyl/cc will be used in both groups

No ultrasound

Palpation of anatomical landmarks Woman requests epidural for pain relief CSE placed using palpation of anatomical landmarks Continuous epidural infusion started

Group Type ACTIVE_COMPARATOR

No ultrasound

Intervention Type PROCEDURE

Palpation of anatomical landmarks is used for placement of labor analgesia

Epidural infusion

Intervention Type PROCEDURE

An epidural infusion will be started in both groups, regarding of the technique used for placement, and the same solution of Bupivacaine 0.0625% with 2mcg fentanyl/cc will be used in both groups

Interventions

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Ultrasound

The ultrasound imaging of the lumbar spine in different scanning planes facilitates the identification of the landmarks necessary for appropriate epidural space location in pregnant patients. There are two acoustic windows that are effective for lumbar spine sonographic assessment: one seen on the transverse approach, and the other seen on the longitudinal paramedian approach. The ultrasound single-screen method using the transverse approach of the lumbar spine provides reliable information regarding the landmarks required for labor epidurals. The correct interspace and midline position are identified for correct placement of the CSE analgesia.

Intervention Type DEVICE

No ultrasound

Palpation of anatomical landmarks is used for placement of labor analgesia

Intervention Type PROCEDURE

Epidural infusion

An epidural infusion will be started in both groups, regarding of the technique used for placement, and the same solution of Bupivacaine 0.0625% with 2mcg fentanyl/cc will be used in both groups

Intervention Type PROCEDURE

Eligibility Criteria

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Inclusion Criteria

* Nulliparous
* Term (\>37 weeks gestation)
* Vertex presentation
* Singleton gestation
* Ability to provide informed consent
* Request for analgesia for labor pain
* Maternal age 18 years or greater

Exclusion Criteria

* Multiparous
* Preterm (\< 37 weeks gestation)
* Presentation other than vertex (breech, transverse)
* Active drug/alcohol dependence
* Previous spinal surgeries
* Known spinal deformities

Minimum Eligible Age

18 Years

Maximum Eligible Age

48 Years

Eligible Sex

FEMALE

Accepts Healthy Volunteers

Yes