The purpose of performing the Arthrocentesis is:

RRB Nsg. Superintendent -29 April-2025 (shift-2nd)

Medical Surgical Nursing

Easy

Appeared in: RRB Nsg. Superintendent -29 April-2025 (shift-2nd)

Explanation

Arthrocentesis, also known as joint aspiration, is performed to obtain synovial fluid from a joint.
The primary purpose is diagnostic: the fluid is examined to identify the cause of joint inflammation, pain, or swelling.
Analysis of the fluid can reveal infections (septic arthritis), crystals (gout), or signs of inflammatory diseases like rheumatoid arthritis.
The procedure can also be therapeutic, to relieve pressure by draining excess fluid (effusion) or to inject medications like corticosteroids.

Option A: Muscle contraction and its electrical potential are evaluated using Electromyography (EMG), not by aspirating joint fluid.
Option C: Bone mass or bone mineral density (BMD) is measured to diagnose conditions like osteoporosis.
Option D: This procedure does not assess blood flow. Abnormalities in blood circulation are typically evaluated using imaging techniques.

Visual 1: Diagram - An illustration of the Arthrocentesis procedure on a knee joint, showing the needle entering the synovial space to aspirate fluid. This helps visualize the anatomical landmarks and technique.
Visual 2: Chart - A comparative table showing the characteristics of normal synovial fluid versus fluid found in inflammatory, septic, and crystal-induced arthritis (e.g., color, clarity, viscosity, cell count). This clarifies the diagnostic value of the analysis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Purpose of Arthrocentesis as background academic context rather than a clinical decision trigger.
Nurses play a crucial role in patient preparation, ensuring informed consent, positioning the patient correctly, and maintaining sterility during the procedure.
Post-procedure care is a key nursing responsibility, including applying a compression dressing, advising on joint rest and ice application, and monitoring for complications.
Patient education is vital. The nurse must instruct the patient to report signs of infection (fever, increased redness, swelling, pain) or excessive bleeding immediately.

How to Approach the Question

First, analyze the term 'Arthrocentesis'. Break it down: 'Arthro-' refers to a joint, and '-centesis' refers to a puncture to remove fluid.
With this definition, the purpose is clearly related to obtaining fluid from a joint.
Evaluate the options. 'Synovial fluid analysis' directly matches the purpose of aspirating fluid from a synovial joint.
Rule out the other options by associating them with their correct diagnostic tests: Muscle function is tested with EMG, bone mass with a DEXA scan, and blood flow with Doppler ultrasound.
This process of elimination, combined with understanding the medical terminology, confirms the correct answer.

Concept Tested & Keywords

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