A resident has given a top-up epidural infusion of 3 mg morphine with 10 ml of 0.1% ropivacaine. Which of the following symptoms requires immediate action?

Appeared in: AIIMS Rishikesh & Jodhpur NO - 2017

Explanation

A fast, pounding pulse (tachycardia) is a critical sign of cardiovascular instability.
This symptom can indicate the onset of Local Anesthetic Systemic Toxicity (LAST) from the ropivacaine.
Cardiovascular toxicity is characterized by an initial stimulation phase (tachycardia, hypertension) which can rapidly progress to depression (bradycardia, hypotension) and cardiac arrest.
This symptom requires immediate cessation of the infusion and emergency intervention to prevent life-threatening arrhythmias.

Why Other Options Were Wrong

Option A: Bladder and bowel incontinence indicates a neurological issue, such as a high block, which is serious but less immediately life-threatening than acute cardiovascular collapse.
Option B: Confusion is a sign of CNS toxicity from either the opioid or the local anesthetic. While it is a warning sign, the presence of cardiovascular symptoms like tachycardia indicates a more advanced and immediately dangerous stage of toxicity.
Option D: Hallucinations are a known CNS side effect of opioids like morphine. While distressing and requiring management, they do not represent an immediate threat of cardiorespiratory arrest.

Related Visual

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Recognition of life-threatening complications of epidural anesthesia as background academic context rather than a clinical decision trigger.
Nurses must conduct vigilant monitoring of vital signs (heart rate, blood pressure, respiratory rate, and oxygen saturation) every 15 minutes after an epidural bolus or infusion change.
Recognizing early signs of LAST is critical. The mnemonic 'STOP' can be used: Stop the infusion, call for help, Treat with lipid emulsion, and support Oxygenation and perfusion.
All units where epidural anesthesia is administered must have a 'LAST rescue kit' readily available, containing 20% lipid emulsion and emergency resuscitation drugs.

How to Approach the Question

First, identify the medications administered: an opioid (morphine) and a local anesthetic (ropivacaine).
Recall the most severe, life-threatening complications associated with these drugs in an epidural: Local Anesthetic Systemic Toxicity (LAST), high/total spinal block, and opioid-induced respiratory depression.
Analyze each option through the lens of the ABCs (Airway, Breathing, Circulation).
A 'fast pounding pulse' is a direct indicator of a problem with 'C' - Circulation. It is a key sign of the initial excitatory phase of cardiovascular toxicity in LAST.
Symptoms like confusion and hallucinations are CNS-related and, while serious, are generally considered less immediately life-threatening than acute cardiovascular instability.
Bladder/bowel incontinence is a neurological sign, but it does not signal the same rapid deterioration as a major change in heart rate.

Concept Tested & Keywords

Concept Tested: Recognition of life-threatening complications of epidural anesthesia.
Stem keywords: epidural infusion, morphine, ropivacaine, immediate action
Lead-in keywords: immediate action
Clinical cues: Patient received a top-up epidural with an opioid (morphine) and a local anesthetic (ropivacaine).

Question ID

QSk5nLS2heyARYq47xYKS2

Reference Book

E6 Obstetrics Williams p. 63-84

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 163-165

E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 7686-7688

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