Epidural anesthesia and analgesia. Their role in postoperative outcome.

<zdoi;10.1097/ALN.0000000000000935> Anesthesiology, V 124 • No 2 270 February 2016 P RACTICE guidelines are systematically developed recommendations that assist the practitioner and patient in making decisions about health care. These recommendations may be adopted, modified, or rejected according to the clinical needs and constraints and are not intended to replace local institutional policies. In addition, practice guidelines developed by the American Society of Anesthesiologists (ASA) are not intended as standards or absolute requirements, and their use cannot guarantee any specific outcome. Practice guidelines are subject to revision as warranted by the evolution of medical knowledge, technology, and practice. They provide basic recommendations that are supported by a synthesis and analysis of the current literature, expert and practitioner opinion, open-forum commentary, and clinical feasibility data. This document updates the “Practice Guidelines for Obstetric Anesthesia: An Updated Report by the ASA Task Force on Obstetric Anesthesia,” adopted by ASA in 2006 and published in 2007.†

Practice Guidelines for Obstetric Anesthesia: An Updated Report by the American Society of Anesthesiologists Task Force on Obstetric Anesthesia and the Society for Obstetric Anesthesia and Perinatology ∗

The anatomy, physiology, and pharmacology of an intrinsic neural network that monitors and modulates the activity of pain-transmitting neurons is reviewed. This system can be activated by opiate administration or by electrical stimulation of discrete brainstem sites. Evidence is presented that its pain-suppressing action is mediated in part by endogenous opiatelike compounds (endorphins). This pain suppression system is organized at three levels of the neuraxis: midbrain, medulla, and spinal cord. Activation of neurons in the midbrain periaqueductal gray matter (by electrical stimulation, opiates, and possibly psychological factors) excites neurons of the rostral medulla, some of which contain serotonin. The medullary neurons, in turn, project to and specifically inhibit the firing of trigeminal and spinal pain-transmission neurons. As part of a negative feedback loop, the output of the pain transmission neurons, i.e., pain itself, is an important factor in activating the pain-suppression system. A neural model which incorporates the experimental findings is proposed, and the clinical implications of the model are discussed.

Endogenous pain control mechanisms: review and hypothesis

Neurologic Deficits following Epidural or Spinal Anesthesia Robert Kane; Anesthesia & Analgesia

Neurologic deficits following epidural or spinal anesthesia.

Of the 4 million annual births in the United States, 2.4 million involve epidural analgesia. Serious adverse events are rare but are important in young women. Robust estimates for the risk of harm are not available. Data for superficial and deep infections, hematoma, and transient and permanent neurologic injury were obtained from studies reporting adverse events with obstetric epidural analgesia, and incidence presented as individual risk for a woman, number of events per million women, and percentage incidence. A total of 1.37 million women received an epidural for childbirth, reported in 27 articles. Most information (85% of women) was in larger (> 10,000 women) studies published after 1990, with risk estimates as follows: epidural hematoma, 1 in 168,000; deep epidural infection, 1 in 145,000; persistent neurologic injury, 1 in 240,000; and transient neurologic injury, 1 in 6,700. Earlier and smaller studies produced significantly higher risk estimates for transient neurologic injury plus injury of unknown duration.

Incidence of epidural hematoma, infection, and neurologic injury in obstetric patients with epidural analgesia/anesthesia

In a double-blinded, randomized, prospective multi-center study of 695 women, we investigated whether epidural injection of sufentanil added to 0.125% bupivacaine with epinephrine (1:800,000) reduces the total amount of local anesthetic required, resulting in less motor blockade and reduced incidence of instrumental deliveries, and improves the quality of analgesia provided by this low concentration of local anesthetic without jeopardizing the safety of the baby. In addition, other potential benefits of sufentanil (such as decrease in the incidence of shivering) and side effects were examined. It was found that adding incremental doses of 10 micrograms sufentanil up to a maximum of 30 micrograms reduced the incidence of instrumental deliveries from 36 to 24% (P less than 0.01) and significantly improved quality and duration of analgesia without depressing the neurobehavioral status of the baby. No other benefits from adding sufentanil were found. The only side effect that occurred more frequently after sufentanil was pruritus. We conclude that epidural injection of 10-30 micrograms sufentanil added to 0.125% bupivacaine with epinephrine (1:800,000) improved the quality of analgesia during labor and reduced the incidence of instrumental deliveries without jeopardizing the safety of the baby.

The effects of the addition of sufentanil to 0.125% bupivacaine on the quality of analgesia during labor and on the incidence of instrumental deliveries.

A double-blind study was designed in order to determine the specificity and sensitivity of an epidural test dose to detect inadvertent intravenous injection in obstetric patients undergoing epidural analgesia. Forty unselected obstetric patients were given an intravenous injection of 10 ml bupivacaine 0.125% with 12.5 micrograms epinephrine (test dose) or 10 ml normal physiologic saline. The maternal heart rate was monitored by the direct ECG mode of a fetal monitor and registered simultaneously with the tocogram. The primary investigator was blinded to the solution he injected into an antecubital vein. After the injection was given, he recorded his judgment of which solution he had administered. Eight other anesthesiologists made similar judgments on the basis of the recordings plus various levels of additional information (presence or absence of epidural analgesia, time of injection, subjective signs and symptoms). In contrast to the primary investigator, the blood pressure values were not given to them. For the primary investigator, the specificity of the test dose was 100% and the sensitivity 97.5%. The judgments of the 8 other anesthesiologists resulted in an excellent specificity (99.1%) and a good sensitivity (91.9% with information on time of injection and subjective signs and symptoms). The better performance of the primary investigator is probably due to the availability of blood pressure data.

Ten ml bupivacaine 0.125% with 12.5 μg epinephrine is a reliable epidural test dose to detect inadvertent intravascular injection in obstetric patients. A double‐blind study

Increased incidence of itching and herpes simplex in patients given epidural morphine after cesarean section.

Every dose given in epidural analgesia for vaginal delivery can be a test dose.

Bupivacaine, 0.125 per cent, with epinephrine, 1:800,000, was administered to 3,000 women in labor. Administration was in the lumbar epidural space for the purpose of achieving satisfactory analgesia with minimal or no motor paralysis. The usual initial dose of 12.5 mg (mean 13 +/- 2 SD) resulted in good sensory analgesia in 83 per cent of the patients and lasted for about and hour (mean 58 +/- 16 min). The mean total dose used for labor and delivery was 55 +/- 20 mg and the mean dose per hour 23 +/- 13 mg. Satisfactory analgesia for labor and delivery was obtained in 92 per cent of the patients, and in 66 per cent there was no discernible motor blockade. In the 3,000 patients, there was no adverse reaction to bupivacaine or epinephrine. No patient had a total spinal block or neurologic sequelae, and no neonatal depression could be attributed to the anesthetic.

Bupivacaine, 0.125 per cent, in obstetric epidural analgesia: experience in three thousand cases.

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