A nurse is collecting data for a client who experienced a myocardial infarction prior to a cardiac arrest. Which of the following laboratory tests will identify early injury to the cardiac muscle?
Creatine kinase-myocardial band (CK-MB) test
Troponin T test
Brain natriuretic peptide (BNP) test
Creatine kinase (CK) test
The Correct Answer is B
A. Creatine kinase-myocardial band (CK-MB) test: While CK-MB is also a marker of myocardial injury, it is less specific than troponin and can be elevated in other conditions, such as muscle injury.
B. Troponin T test. The Troponin T test is highly specific and sensitive for myocardial injury and is considered the gold standard for diagnosing a myocardial infarction. Troponin levels rise within hours of cardiac muscle injury and remain elevated for days, providing an early and reliable indicator of cardiac muscle damage.
C. Brain natriuretic peptide (BNP) test. BNP levels are used to assess heart failure and do not indicate acute cardiac muscle injury.
D. Creatine kinase (CK) test. CK measures overall muscle injury, not specific to cardiac muscle.
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Correct Answer is B
Explanation
A. "Your heart condition is caused from stiffening of the walls of the ventricles." Stiffening of the ventricular walls describes restrictive cardiomyopathy, not DCM.
B. "Your heart condition is caused by excessive stretching of the ventricles." DCM involves excessive stretching and thinning of the ventricular walls, leading to impaired contraction.
C. "Your heart condition is caused when the ventricular tissue becomes fibrous and fatty." This describes arrhythmogenic right ventricular dysplasia, not DCM.
D. "Your heart condition is caused by thickening of the ventricular walls and septum." This describes hypertrophic cardiomyopathy, not DCM.
Correct Answer is D
Explanation
A. Barrel chest. A barrel chest is commonly seen in chronic obstructive pulmonary disease (COPD) rather than mitral valve stenosis.
B. Bradycardia. Bradycardia is not typically associated with mitral valve stenosis, as symptoms often include rapid or irregular heartbeat.
C. Clubbing of the fingers. Clubbing is associated with chronic hypoxia, often due to pulmonary conditions, not specifically with mitral valve stenosis.
D. Heart murmur. Mitral valve stenosis causes turbulent blood flow through the narrowed valve, resulting in a characteristic murmur.