A person diagnosed with SDH and having continuous vomiting. What is the most probable contraindication for LP for this client?

Appeared in: NIMHANS Nursing Officer - 2019

Explanation

A subdural hematoma (SDH) is a space-occupying lesion that increases the volume within the fixed cranial vault, leading to increased intracranial pressure (ICP).
Continuous vomiting is a key clinical manifestation of elevated ICP, resulting from pressure on the brainstem's vomiting center.
Performing a lumbar puncture (LP) in the presence of increased ICP is absolutely contraindicated.
The sudden removal of cerebrospinal fluid (CSF) from the lumbar space creates a pressure gradient that can cause downward displacement and herniation of the brainstem, which is a fatal complication.

Option A: Decreased ICP is the opposite of the condition expected with an SDH and is not a contraindication for an LP.
Option C: A mild fever is often an indication to perform an LP to rule out central nervous system infections like meningitis, not a reason to avoid it.
Option D: Nausea is a symptom, not a primary contraindication. It is often associated with increased ICP, but the underlying pressure elevation is the true contraindication.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Contraindications for Lumbar Puncture as background academic context rather than a clinical decision trigger.
A nurse's primary role is patient safety. Recognizing the signs of increased ICP (headache, vomiting, altered level of consciousness, pupillary changes) is a critical assessment skill.
If a nurse assesses a patient with a head injury who is vomiting, they must immediately suspect increased ICP and alert the physician. They should question any order for a lumbar puncture in this scenario until imaging (like a CT scan) has ruled out a significant mass effect.
What if? If the patient had a fever and headache but NO history of trauma, no SDH, and no vomiting, an LP would be a primary diagnostic tool to investigate for meningitis. The absence of signs of increased ICP makes the procedure safe.

How to Approach the Question

First, identify the key elements of the clinical scenario: The patient has a known diagnosis (SDH) and a significant symptom (continuous vomiting).
Connect the diagnosis and symptom to an underlying pathophysiology. An SDH is a mass, and vomiting is a classic sign of increased intracranial pressure (ICP).
Consider the procedure in question: Lumbar Puncture (LP). Recall the purpose and risks of an LP.
Evaluate how the patient's condition (increased ICP) interacts with the risks of the procedure (LP). The primary risk of LP in the setting of increased ICP is brain herniation.
Analyze the options. 'Increased ICP' directly identifies the critical pathophysiological state that makes the LP dangerous. The other options are either irrelevant (decreased ICP), an indication (mild fever), or a symptom of the underlying problem (nausea).

Concept Tested & Keywords

Concept Tested: Contraindications for Lumbar Puncture
Stem keywords: Subdural Hematoma (SDH), continuous vomiting, Lumbar Puncture (LP), contraindication
Lead-in keywords: most probable
Clinical cues: Diagnosis of SDH suggests a space-occupying lesion.
Clinical cues: Continuous vomiting is a classic sign of increased ICP.

QB56vX9U2mxB0J5L_DCeMj

E6 Nursing Brunner Adult Health 3SA Vol 2 Part 2 pp. 29-31, 37-39, 33-35

Practise the full NIMHANS Nursing Officer - 2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.