A patient was brought to ED with complaint of chest pain from last 1 hour. Which test is done to detect myoca… - AIIMS Delhi NO- 2019

AIIMS Delhi NO- 2019

Medical & Surgical Nursing

Easy

Appeared in: AIIMS Delhi NO- 2019

Explanation

Troponin T is a protein component of the heart muscle that is released into the bloodstream during myocardial injury.
It is a highly specific and sensitive biomarker for diagnosing myocardial infarction (MI).
Elevated Troponin T levels can be detected in the blood as early as 2-4 hours after the onset of symptoms, making it a crucial tool for early diagnosis.
The test shown in the image is a rapid point-of-care test for Troponin T, allowing for quick assessment in emergency situations.

Option A: Serum electrolyte tests measure minerals like sodium and potassium. While imbalances (especially in potassium) can affect heart rhythm, they do not diagnose the death of heart muscle tissue (myocardial infarction).
Option B: An Arterial Blood Gas (ABG) analysis measures the oxygen, carbon dioxide, and pH levels in the blood. It assesses a patient's respiratory and metabolic status, not direct cardiac muscle damage.
Option C: A Complete Blood Count (CBC) evaluates red blood cells, white blood cells, and platelets. It is used to detect conditions like anemia, infection, or bleeding disorders, which are not the primary indicators of an MI.

Clinical Relevance

Nursing practice connection: Use the key finding related to Diagnosis of Myocardial Infarction using Cardiac Biomarkers to guide bedside assessment, documentation, and the next nursing action.
A nurse's primary role in a suspected MI is to obtain an ECG within 10 minutes of arrival and draw blood for cardiac biomarkers promptly. Delays can impact treatment decisions.
Understanding the timeline of troponin elevation is crucial. An initial negative troponin does not rule out an MI, as levels may not have risen yet. Serial testing (e.g., at 0, 3, and 6 hours) is standard protocol.
What if the patient's chest pain started 15 days ago? In that case, Troponin T would likely have returned to normal levels. While it's excellent for acute diagnosis, it's not a marker for an old MI. An echocardiogram or other imaging would be needed to assess for long-term heart muscle damage.

How to Approach the Question

First, identify the core clinical question: The patient has acute chest pain, and the goal is to diagnose a myocardial infarction (MI).
Recall the primary diagnostic tools for MI. This includes an ECG and specific blood tests known as cardiac biomarkers.
Scan the options to see which one represents a key cardiac biomarker.
Option A (Electrolytes), B (ABG), and C (CBC) are general lab tests. While important for overall patient assessment, they are not specific for diagnosing heart muscle death.
Option D (Troponin T) is a highly specific cardiac biomarker released during an MI.
Therefore, Troponin T is the most direct and correct test to detect myocardial infarction among the choices.

Concept Tested & Keywords

Concept Tested: Diagnosis of Myocardial Infarction using Cardiac Biomarkers
Stem keywords: chest pain, myocardial infarction, test
Lead-in keywords: Which test
Clinical cues: Patient in ED with chest pain for 1 hour, suggesting an acute cardiac event.

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