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 D
Explanation
A. Overweight. While weight can affect medication metabolism, it does not specifically increase risk with pseudoephedrine.
B. Migraine headaches. Migraine headaches are not contraindicated with pseudoephedrine, although some stimulants can increase headaches.
C. Eczema. Pseudoephedrine does not typically affect eczema.
D. Hypertension. Pseudoephedrine is a decongestant that can increase blood pressure, so it should be used with caution in clients with hypertension.
Correct Answer is B
Explanation
A. Slow: Atrial fibrillation typically leads to an irregular, often rapid pulse, not necessarily slow.
B. Irregular: Atrial fibrillation causes an irregular pulse due to uncoordinated atrial contractions.
C. Bounding: A bounding pulse is associated with conditions like high cardiac output or fluid overload, not atrial fibrillation.
D. Not palpable: The pulse in atrial fibrillation is usually palpable but irregular.