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. Schedule deep tissue massage with physical therapy. Massaging the area is contraindicated in cases of suspected deep vein thrombosis (DVT), as it can dislodge the clot, leading to a pulmonary embolism.
B. Monitor Homan's sign. Homan’s sign (pain in the calf upon dorsiflexion) is no longer considered a reliable or safe assessment for DVT due to the risk of dislodging a clot.
C. Obtain platelet aggregation studies. Platelet aggregation studies are not specific to diagnosing a DVT; instead, imaging is preferred.
D. Arrange for a venous duplex ultrasound. A venous duplex ultrasound is a non-invasive test that can confirm the presence of a DVT in the affected extremity.
Correct Answer is A
Explanation
A. To prevent blood clotting: Aspirin is an antiplatelet agent, and it reduces blood clot formation, which helps prevent further cardiac events after an MI.
B. To reduce inflammation: Although aspirin has anti-inflammatory properties, this is not the primary reason for its use in post-MI clients.
C. To prevent fever: Aspirin can reduce fever, but this is not its purpose in MI prevention.
D. To provide analgesia: Aspirin can relieve pain, but in this context, it is used to prevent blood clotting, not as an analgesic.