Core Nursing Explanation
Key Concept Analysis: This question tests the priority nursing action following a
bone marrow biopsy. The core principle is
post-procedural safety and complication prevention. A bone marrow biopsy involves inserting a large-bore needle into the bone (typically the posterior iliac crest) to aspirate marrow. This creates a puncture site that can bleed significantly because the bone marrow is highly vascular. The immediate post-procedural period (first few hours) carries the highest risk for
hemorrhage and
hematoma formation.
Answer Rationale:
Key Point! The highest priority action is to
apply direct pressure to the biopsy site and monitor for bleeding. This directly addresses the most immediate and life-threatening risk—hemorrhage. Applying pressure promotes hemostasis (clot formation), and vigilant monitoring allows for early detection and intervention if bleeding occurs. This aligns with the nursing process principle of addressing
actual threats to physiological integrity (Airway, Breathing, Circulation - ABCs) before potential or comfort-related issues.
Distractor Analysis:
Watch out for confusion! Option ①, "Encourage early ambulation to prevent blood clots," is contraindicated immediately after a bone marrow biopsy. Ambulation increases blood pressure and physical stress on the site, which can
disrupt clot formation and
precipitate bleeding. Patients are typically instructed to lie on their back (supine) for 30-60 minutes to apply direct pressure via body weight.
Option ③, "Administer prescribed pain medication for comfort," addresses a legitimate patient need (pain at the biopsy site is common) but is a
comfort measure, not a safety priority. Safety (preventing hemorrhage) always takes precedence over comfort.
Option ④, "Assess neurological status every 15 minutes," is not a standard or priority action for a routine iliac crest biopsy. Neurological assessment is critical for procedures involving the
spinal column or when there is risk of nerve damage. The posterior iliac crest is a safe site chosen specifically to avoid major nerves and blood vessels; thus, frequent neuro checks are not the priority.
Related Concepts: This question integrates knowledge of
invasive procedure care,
hemorrhage prevention, and
nursing prioritization (ABCs). Understanding why the iliac crest is the preferred site (large, accessible, away from vital structures) reinforces the rationale for the correct nursing actions.
Concept Summary
| Concept | Key Points |
|---|
| Bone Marrow Biopsy | Diagnostic procedure to obtain marrow sample. Posterior iliac crest is the most common site in adults. |
| Primary Complication | Bleeding/Hematoma. The marrow is highly vascular; the needle creates a tract that must seal. |
| Priority Nursing Action | Apply direct pressure (often via positioning) and monitor site for bleeding, swelling, or hematoma. |
| Post-Procedure Positioning | Supine for 30-60 minutes to apply pressure. Avoid sitting or ambulating immediately. |
| Patient Education | Report increased pain, swelling, warmth, or continued oozing at the site. Avoid strenuous activity for 1-2 days. |
Side-by-Side Comparison!
| Priority Action (Correct) | Why Other Actions Are Not the Priority |
|---|
| Apply pressure & monitor for bleeding | Addresses the immediate safety risk of hemorrhage (Circulation - part of ABCs). |
| Encourage early ambulation | Contraindicated! Increases bleeding risk. Pressure and rest are needed first. |
| Administer pain medication | Important for comfort but is a secondary intervention after safety is ensured. |
| Assess neurological status | Not routine for this site. Priority for spinal/neurological procedures, not iliac crest biopsy. |
Anatomy, Physiology & Pharmacology Points
- Anatomy: The posterior iliac crest is chosen because it has a large surface area of accessible marrow, is away from major organs, and has fewer major blood vessels and nerves compared to the sternum.
- Physiology: Bone marrow is the site of hematopoiesis (blood cell production) and is therefore extremely vascular. This high vascularity is why bleeding is the primary concern.
- Pathophysiology: Patients with thrombocytopenia (low platelets) or coagulopathies are at even greater risk for post-biopsy bleeding and require extended pressure and observation.
Memory Tips
- ABCs & Bleeding: Remember your priorities! Airway, Breathing, Circulation. Bleeding is a "C" (Circulation) problem. Always address circulation threats first.
- Acronym: P.R.E.S.S. for Post-Biopsy Care:
Pressure on site.
Rest (supine position).
Evaluate for bleeding.
Site monitoring.
Safety first!
High-Frequency NCLEX Topics
The NCLEX frequently tests
priority-setting and
post-procedure care. You must distinguish between a
correct nursing action and the
most important or
first action. Questions involving invasive procedures (biopsies, paracentesis, lumbar puncture) almost always prioritize
complication prevention (bleeding, infection) and
monitoring over comfort or routine tasks.
Watch Out for Question Variations!
- If the patient has thrombocytopenia, the question might ask: "The nurse should plan to apply pressure for how long?" (Answer: Longer than usual, e.g., 10-15 minutes minimum, possibly with a pressure dressing).
- The question could shift from immediate care to discharge teaching: "Which statement by the client indicates understanding of post-biopsy care?" Correct answer would involve reporting signs of bleeding or infection, not ambulating immediately.
- They might ask about site selection: "Why is the posterior iliac crest the preferred site for a bone marrow biopsy on an adult?" Focus on safety (away from organs, large flat surface).