Pain Management in Labor — MCQs
A female was given morphine sulphate during labour for pain but she developed respiratory distress. Which of the following will be the correct antidote?
True about epidural opioid are all except:
The gold standard of labor analgesia is which of the following:
True about Epidural anesthesia:
Best treatment for relieving pain during intrapartum period is:
Which of the following is a definitive indicator of true labor pain?
Nerve endings sensitive to noxious stimuli are present in all except:
Which nerve block is given in forceps delivery?
A newborn was given a drug in the neonatal ICU, but then was found in respiratory distress. The likely drug is?
A 20 year old primigravida is admitted with full term pregnancy and labour pains. At 4 A.M. she goes into active phase of labour with 4 cm cervical dilatation. Membranes rupture during p/v examination showing clear liquor. A repeat p/v after 4 hours of good uterine contractions reveals a cervical dilatation of 5 cm. What should be the next step in management?
Pain Management in Labor Indian Medical PG Practice Questions and MCQs
Question 1: A female was given morphine sulphate during labour for pain but she developed respiratory distress. Which of the following will be the correct antidote?
- A. Naloxone (Correct Answer)
- B. Epinephrine
- C. Pralidoxime
- D. Atropine
Explanation: ***Naloxone*** - **Naloxone** is a pure opioid antagonist that rapidly reverses the effects of **opioid overdose** [1, 3], including **respiratory depression** [2], by competitively binding to opioid receptors [1]. - Its short half-life may necessitate repeated doses, especially with longer-acting opioids like morphine, to prevent recurrence of respiratory depression [1]. *Epinephrine* - **Epinephrine** is an adrenergic agonist used to treat **anaphylaxis** and severe allergic reactions, as it causes **vasoconstriction** and **bronchodilation**. - It is not an antidote for opioid-induced respiratory depression, which primarily results from central nervous system effects rather than allergic reactions. *Pralidoxime* - **Pralidoxime** is a **cholinesterase reactivator** used to treat poisoning by **organophosphates**, which inhibit acetylcholinesterase, leading to cholinergic crisis. - It works by restoring the function of the enzyme, thereby breaking down excess acetylcholine, and is not indicated for opioid overdose. *Atropine* - **Atropine** is an **anticholinergic agent** that blocks muscarinic acetylcholine receptors, used to treat **bradycardia** and **organophosphate poisoning**. - It would not reverse opioid-induced respiratory depression, as it primarily affects the parasympathetic nervous system and does not antagonize opioid receptor effects.
Question 2: True about epidural opioid are all except:
- A. Act on dorsal horn substantia gelatinosa
- B. Can cause Itching
- C. Can cause respiratory depression
- D. Function of the intestine is not affected (Correct Answer)
Explanation: **Function of the intestine is not affected** - **Epidural opioids** can indeed cause **constipation** and other gastrointestinal side effects by affecting opioid receptors in the **gut wall**, thus disturbing normal intestinal motility. - The phrase "not affected" is incorrect because **opioids inherently reduce gastrointestinal motility**, leading to common side effects such as nausea, vomiting, and constipation. *Act on dorsal horn substantia gelatinosa* - This statement is true; **epidural opioids work primarily by binding to opioid receptors** in the **substantia gelatinosa** of the dorsal horn of the spinal cord. - This binding **inhibits the release of neurotransmitters** like substance P, thus preventing the transmission of pain signals. *Can cause Itching* - **Pruritus (itching)** is a very common side effect of **epidural opioids**, often concentrated around the face and trunk. - It results from the **activation of opioid receptors** in the central nervous system and the release of histamine. *Can cause respiratory depression* - **Respiratory depression** is a serious and potentially life-threatening side effect of **epidural opioids**, particularly with higher doses or systemic absorption. - It occurs due to the **suppression of the medullary respiratory centers** in the brainstem.
Question 3: The gold standard of labor analgesia is which of the following:
- A. Continuous lumbar epidural (Correct Answer)
- B. IV opioid infusion
- C. Continuous inhalational agent
- D. Nerve block
Explanation: ***Continuous lumbar epidural*** - Provides the most **effective and comprehensive pain relief** for labor, blocking sensory nerves from the uterus, cervix, and perineum. - Allows the mother to remain **awake and alert**, participate in the birth process, and can be easily titrated to maintain comfort. *IV opioid infusion* - Offers systemic pain relief but often causes **sedation** in both mother and baby and provides less effective pain relief compared to epidurals. - Can lead to **respiratory depression** in the neonate if administered too close to delivery. *Continuous inhalational agent* - Agents like nitrous oxide offer **mild to moderate analgesia** but can cause **nausea, dizziness, and incomplete pain relief** during active labor. - Not considered the gold standard due to its limited efficacy for severe labor pain. *Nerve block* - While effective for specific areas (e.g., pudendal block for perineal pain), nerve blocks are usually **surgical procedures** (e.g. cervical nerve block, paracervical block) and provide **localized pain relief only**, often not sufficient for global labor pain. - Unlike **epidurals**, they don't provide continuous, widespread pain management for all stages of labor.
Question 4: True about Epidural anesthesia:
- A. Given in subarachnoid space
- B. Effects start immediately
- C. C/I in coagulopathies (Correct Answer)
- D. All of the options
Explanation: ***C/I in coagulopathies*** - **Coagulopathy** is a **contraindication** for epidural anesthesia due to the significant risk of **epidural hematoma** formation. - An epidural hematoma can compress the spinal cord, leading to **neurological damage** or **paralysis**. *Given in subarachnoid space* - Epidural anesthesia involves injecting anesthetic agents into the **epidural space**, which is superficial to the **dura mater**. - Injection into the **subarachnoid space** is characteristic of **spinal anesthesia**, not epidural anesthesia. *Effects start immediately* - The onset of action for epidural anesthesia is typically **slower** compared to spinal anesthesia, usually taking **10-20 minutes**. - This delay is due to the need for the anesthetic to diffuse across the dura and nerve roots to reach the spinal cord. *All of the options* - This option is incorrect because only one of the statements provided (C/I in coagulopathies) is true regarding epidural anesthesia. - The other statements about the injection site and onset of action are false.
Question 5: Best treatment for relieving pain during intrapartum period is:
- A. Epidural anesthesia (Correct Answer)
- B. General Anesthesia
- C. Spinal anesthesia
- D. IV ketamine
Explanation: ***Epidural anesthesia*** - Provides **continuous pain relief** during labor, allowing mobility and control over medication dosage through patient-controlled epidural analgesia (PCEA). - It is effective for both vaginal and cesarean deliveries, offering superior pain control compared to other methods while maintaining maternal consciousness. *General Anesthesia* - Involves a **complete loss of consciousness** and is primarily reserved for emergency cesarean sections due to its associated risks for both mother and baby. - It is unsuitable for routine labor pain management as it prevents maternal participation and response during delivery. *Spinal anesthesia* - Provides **rapid, intense pain relief** but is typically a single-shot injection with a shorter duration of action compared to epidural anesthesia. - It is often used for planned cesarean sections or for a rapid, profound block during the late stages of labor, but it does not allow for long-term, dynamic pain management like an epidural. *IV ketamine* - Can be used for pain relief in lower doses, but it can cause **sedation, hallucinations, and dysphoria**, which are undesirable during labor. - While it's a potent analgesic, its side effect profile makes it a less favorable choice than regional anesthesia for routine intrapartum pain relief.
Question 6: Which of the following is a definitive indicator of true labor pain?
- A. None of the options
- B. Rupture of membranes (water breaking)
- C. Uterine contractions at regular intervals
- D. Progressive effacement and dilation of cervix (Correct Answer)
Explanation: ***Progressive effacement and dilation of cervix*** - **Progressive cervical change** (effacement and dilation) is the universally accepted definitive sign of **true labor**. - This indicates that the **uterine contractions** are effective in preparing the cervix for birth. *Uterine contractions at regular intervals* - While regular contractions are a characteristic of early labor, they can also occur with **Braxton Hicks contractions** (false labor) which do not lead to cervical change. - The **regularity** alone does not confirm that labor is true or progressive. *Rupture of membranes (water breaking)* - **Rupture of membranes** can occur before labor begins, during labor, or not at all (if artificially ruptured). - It is not a definitive sign of established **true labor**, as contractions and cervical changes are still needed for progression. *None of the options* - This option is incorrect because progressive effacement and dilation of the cervix is a **definitive indicator** of true labor. - The other options singly are not definitive, but **cervical change** is.
Question 7: Nerve endings sensitive to noxious stimuli are present in all except:
- A. Intestine
- B. Stomach
- C. Liver (Correct Answer)
- D. Mesentery
Explanation: ***Liver*** - The **liver parenchyma** itself is notable for its lack of **pain receptors**; therefore, sensations like cutting or burning of the liver tissue do not evoke direct pain. - Pain associated with the liver typically arises from the stretching of its **fibrous capsule (Glisson's capsule)** or involvement of surrounding structures, rather than from within the organ. *Intestine* - The intestine contains abundant **nociceptors** that respond to a variety of noxious stimuli, including **distention**, **ischemia**, and **chemical irritants**. - These nerve endings play a crucial role in mediating **visceral pain** experienced during conditions such as inflammatory bowel disease or irritable bowel syndrome. *Stomach* - The stomach is richly innervated with **nociceptors** that detect painful stimuli such as extreme **distension**, potent **chemical irritants**, and **ischemia**. - These nerve endings contribute to the sensation of **gastric pain** associated with conditions like gastritis, ulcers, and gastroesophageal reflux disease. *Mesentery* - The mesentery contains numerous **nociceptors** that are highly sensitive to **stretching**, **ischemia**, and **inflammation**. - Pain originating from the mesentery can be intense and is often implicated in conditions like **mesenteric ischemia** or **peritonitis**.
Question 8: Which nerve block is given in forceps delivery?
- A. Posterior femoral
- B. Genitofemoral
- C. Ilioinguinal
- D. Pudendal (Correct Answer)
Explanation: ***Pudendal*** - A **pudendal block** anesthetizes the **perineum, vulva, and lower vagina**, providing pain relief for instrumental deliveries like **forceps delivery** and for episiotomy. - It involves injecting a local anesthetic near the **pudendal nerve** as it passes posterior to the **ischial spine**. *Posterior femoral* - The **posterior femoral cutaneous nerve** primarily innervates the skin of the posterior thigh and part of the perineum but does not provide sufficient deep analgesia for a forceps delivery. - Blocking this nerve alone would not adequately cover the extensive area affected during instrumental delivery. *Genitofemoral* - The **genitofemoral nerve** primarily innervates the skin of the upper medial thigh and parts of the genitalia but is not the primary nerve for pain relief during vaginal delivery procedures. - Its blockade would not provide the comprehensive analgesia needed for a forceps delivery. *Ilio inguinal* - The **ilioinguinal nerve** innervates the skin of the groin, mons pubis, and labia majora but does not provide sufficient anesthesia for the deeper structures involved in a forceps delivery. - An ilioinguinal nerve block is more commonly used for pain control in procedures involving the groin or hernia repair, not for instrumental vaginal delivery.
Question 9: A newborn was given a drug in the neonatal ICU, but then was found in respiratory distress. The likely drug is?
- A. Morphine (Correct Answer)
- B. Naloxone
- C. Salbutamol
- D. Sodium bicarbonate
Explanation: ***Morphine*** - **Morphine** is an opioid that can cause **respiratory depression** as a significant side effect, especially in neonates who have immature metabolic pathways. - Neonates have a reduced capacity to metabolize and excrete opioids, leading to prolonged effects and a higher risk of **respiratory distress**. *Naloxone* - **Naloxone** is an opioid antagonist used to **reverse opioid overdose** and respiratory depression. - Administering naloxone would improve, not worsen, respiratory distress if it were opioid-induced. *Salbutamol* - **Salbutamol** is a beta-agonist used to **dilate airways** and treat bronchospasm, which would typically improve breathing. - It is not known to cause respiratory distress; rather, it's used to alleviate it in conditions like asthma or bronchiolitis. *Sodium bicarbonate* - **Sodium bicarbonate** is used to treat **metabolic acidosis**, which can sometimes be associated with respiratory issues but does not directly cause respiratory distress itself. - Its primary action is to buffer excess acid in the blood, and while it might impact respiratory drive indirectly, it is not a direct cause of respiratory depression.
Question 10: A 20 year old primigravida is admitted with full term pregnancy and labour pains. At 4 A.M. she goes into active phase of labour with 4 cm cervical dilatation. Membranes rupture during p/v examination showing clear liquor. A repeat p/v after 4 hours of good uterine contractions reveals a cervical dilatation of 5 cm. What should be the next step in management?
- A. Oxytocin drip
- B. Reassess for occipitoposterior position and cephalopelvic disproportion (Correct Answer)
- C. Immediate caesarean section
- D. Reassess after 4 hours
Explanation: ***Reassess for occipitoposterior position and cephalopelvic disproportion*** - The patient has **protracted active phase** with only 1 cm cervical dilatation in 4 hours (from 4 cm to 5 cm), which is significantly slower than the expected rate of at least 1 cm/hour in primigravidas. - Crucially, the question states she has **"good uterine contractions"**, which means the slow progress is NOT due to inadequate uterine activity. - When labor progress is slow DESPITE adequate contractions, this indicates a **mechanical obstruction** such as occipitoposterior position, cephalopelvic disproportion, asynclitism, or other malpresentation. - The next step is to **assess for these mechanical factors** through clinical examination (abdominal palpation, vaginal examination to assess position, station, molding, caput) before considering augmentation. - **Augmentation with oxytocin is contraindicated** when contractions are already adequate, as it may lead to uterine hyperstimulation without improving progress if there's mechanical obstruction. *Oxytocin drip* - Oxytocin augmentation is indicated for **hypotonic uterine dysfunction** (inadequate contractions causing slow progress). - In this case, contractions are described as **"good"**, so oxytocin is NOT appropriate as the first-line intervention. - Using oxytocin when contractions are already adequate without first ruling out mechanical obstruction can be dangerous and may lead to uterine rupture or fetal compromise. *Immediate caesarean section* - While caesarean section may ultimately be needed if mechanical obstruction is confirmed, it is **premature** without first assessing the cause of slow progress. - A diagnosis must be established before proceeding to operative delivery. *Reassess after 4 hours* - Further expectant management without intervention or diagnosis is **inappropriate** as the patient has already demonstrated inadequate progress. - Prolonged labor increases risks of maternal exhaustion, infection, and fetal compromise. - Active management requires diagnosis and intervention, not continued observation.
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