Pain Management

CHAPTER 14: Pain Management

Objectives

• Discuss perceptions of pain: Understanding how pain is perceived varies from individual to individual and can be influenced by a multitude of factors.

• Discuss types of pain in labor: Distinction between types of pain experienced during labor and the physiological basis for those sensations.

• Identify both pharmacological and nonpharmacological methods of pain control: Explore various methods available for managing pain during labor and delivery.

• Identify advantages and disadvantages of each type of pain control: Understanding the pros and cons of different pain management options available to patients.

Pain During Labor and Birth

Neurologic Origins

• Pain during labor originates neurologically and can be classified into three main types:

  1. Visceral Pain:

     • Originates from cervical changes, distention of the lower uterine segment, and uterine ischemia.

     • Typically experienced during the first stage of labor, this pain is often located over the lower portion of the abdomen.

  2. Referred Pain:

     • Pain that originates in the uterus but radiates to other areas such as:

       • Abdominal wall

       • Lumbosacral area of the back

       • Iliac crests

       • Gluteal area

       • Down the thighs

  3. Somatic Pain:

     • This type of pain is characterized as intense, sharp, burning, and localized.

     • Occurs due to stretching and distention of perineal tissues and the pelvic floor as the fetus passes through during the second stage of labor, including distention and traction on the peritoneum and uterocervical supports during contractions and potential lacerations of soft tissue.

Factors Influencing Pain Response

• Various physiological and psychological factors influence each woman's response to pain:

  • Physiologic Factors: Individual variations in pain thresholds and coping mechanisms.

  • Culture: Cultural background can dictate beliefs about pain and pain management.

  • Anxiety: High levels of anxiety can intensify the perception of pain.

  • Previous Experience: Previous experiences with pain can alter current pain tolerance and perception.

• Gate-Control Theory of Pain: A central theory in understanding pain which posits that psychological factors can influence the transmission of pain signals. For example, what do you remember about this theory?

• Comfort and Support: Patients lacking adequate support often have a lower pain tolerance.

• Environment: The setting of labor plays a critical role in pain perception; environments that are cold and sterile may enhance discomfort, contrasting with a more homelike, pleasant “hotel-like” labor room.

Nonpharmacologic Pain Management

Alternative Therapies and Techniques

• Various nonpharmacologic methods can manage labor pain, including:

  • Relaxation Techniques: Reducing tension to alleviate perceived pain.

  • Imagery and Visualization: Mental imagery to distract from pain and promote relaxation.

  • Breathing Techniques: Specific patterns of breathing can help manage pain perception and promote relaxation.

  • Effleurage and Counterpressure: Gentle massage or counterpressure on certain body areas to alleviate discomfort.

  • Touch and Massage: Physical contact that can help reduce pain and anxiety.

  • Applications of Heat and Cold: Using hot or cold packs can provide relief and assist with labor pain management.

  • Acupressure and Acupuncture: Traditional practices that manipulate energy pathways to relieve pain.

  • Transcutaneous Electrical Nerve Stimulation (TENS): A method that uses electrical impulses to interfere with pain signaling.

  • Water Therapy (Hydrotherapy): The use of water to relieve pain and promote relaxation during labor.

  • Intradermal Water Block: A technique for pain relief through the injection of small amounts of water into the skin in specific areas.

  • Aromatherapy: The therapeutic application of essential oils for relief and relaxation.

  • Hypnosis: A technique used to induce a trance-like state for pain management.

  • Music: Listening to music can provide distraction and promote relaxation during labor.

Pharmacologic Pain Management

Types of Pharmacological Agents

• Sedatives: Used to reduce anxiety and promote sleep in early labor.

• Analgesia and Anesthesia: Various methods to provide pain relief:

  • Systemic Analgesia: Medications administered through the systemic route for pain control.

    • Opioids (Narcotic) Full Agonist Analgesics: e.g., Demerol.

    • Opioid (Narcotic) Partial Agonist-Antagonist Analgesics: e.g., Butorphanol (Stadol).

    • Opioid (Narcotic) Antagonists: e.g., Naloxone, which is not used for pain management.

Epidural Anesthesia

• Advantages:

  • Maximum pain relief for the patient.

  • Allows the patient to enjoy the labor experience.

  • Provides control over the timing of delivery.

  • Creates a comfortable and relaxed atmosphere during labor.

  • Duration of analgesia lasts throughout labor and delivery, with the possibility of enhancing labor progress for some patients.

• Disadvantages:

  • May cause marked hypotension which can lead to fetal distress (uteroplacental insufficiency).

  • Potential for ineffective respiratory patterns.

  • Urinary retention as a side effect.

  • Patient immobility may arise.

  • Can slow down contractions.

  • May lead to decreased sensation to push, influencing delivery outcomes.

  • Increased C-section rate related to failure to progress may occur.

Nerve Block Analgesia and Anesthesia

Local Perineal Infiltration Anesthesia

• Typically used during delivery to provide localized pain relief.

• Complications:

  • Headaches can occur due to cerebrospinal fluid (CSF) leaks during epidural administration.

    • An Autologous Epidural Blood Patch may be employed to alleviate headaches.

      • Patients are usually instructed to remain in a head-of-bed flat position for 2-3 days post-procedure.

      • Medications may be given to manage headaches, which tend to resolve without treatment.

Contraindications to Epidural Blocks

• There are certain factors that contraindicate the use of epidural blocks, including:

  • Hemorrhage: Increased risk of bleeding.

  • Hypotension: Circulatory instability.

  • Coagulopathy: Blood coagulation issues that may increase risk of bleeding.

  • Infection at the Injection Site: Increases risk of spreading infection.

  • Allergy to Anesthetic Drug: Exists specific to the pharmacological agents used.

  • Maternal Refusal or Inability to Cooperate: Patients should be able to provide informed consent and cooperate.

  • Maternal Cardiac Conditions: Potential for complications relating to maternal health.

Effects of Epidural Anesthesia on the Newborn

• Generally, there are little to no lasting effects observed on the newborn due to the use of epidural anesthesia during labor.

• Nitrous Oxide: Used extensively in other countries and is gaining popularity in the United States; it is a self-administered gas for pain management.

• General Anesthesia: Used rarely for vaginal births and infrequently for elective cesarean sections due to concerns regarding fetal respiratory depression, particularly in emergency C-sections.

Nursing Interventions

Monitoring After Epidural Injection

• The most critical nursing intervention following epidural anesthesia administration is the monitoring of maternal blood pressure. This is essential to ensure the safety and stability of the mother and fetus during labor and delivery.