A patient has experienced a myocardial infarction. On which primary blood vessel will the nurse focus care to reduce ischemia?

Superior vena cava

Carotid artery

Pulmonary artery

Coronary artery

Answer and Explanation

The Correct Answer is D

A. The superior vena cava is responsible for returning deoxygenated blood from the upper body to the heart and is not directly involved in myocardial ischemia.
B. The carotid artery supplies blood to the brain and is not the primary focus in the context of myocardial infarction.
C. The pulmonary artery carries deoxygenated blood from the heart to the lungs and is not involved in coronary circulation.
D. The coronary arteries supply blood to the heart muscle itself. Ischemia during a myocardial infarction occurs when these arteries are blocked or narrowed, leading to a lack of blood flow and oxygen to the heart tissue.

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Correct Answer is D

Explanation

A. The Good Samaritan Law typically protects individuals who provide care in emergency situations but may not apply if the actions taken are beyond the standard of care or are not in the nurse's training.
B. While the nurse's intention was to save the patient's life, the method employed was not a recognized standard procedure for airway management and may have caused harm.
C. Waiting for help may not have been an appropriate option if the patient's airway was compromised, but the method employed by the nurse was not advisable.
D. Cutting into the trachea and using a straw as a makeshift airway are actions that exceed the typical scope of nursing practice and could be deemed inappropriate, regardless of the outcome for the patient.

A. Weak quadriceps muscles B. Decreased deep tendon reflexes C. Tingling of extremities with possible tetany D. Light-headedness when standing up

Correct Answer is C

Explanation

A. Weak quadriceps muscles can occur with electrolyte imbalances, but the provided values do not indicate hypokalemia or other issues causing muscle weakness.
B. Decreased deep tendon reflexes are generally associated with elevated calcium levels or other electrolyte disturbances but are not specifically indicated by the given lab values.
C. A calcium level of 4.5 mg/dL is significantly low (normal range is typically around 8.5-10.5 mg/dL), which can lead to hypocalcemia symptoms such as tingling of the extremities and tetany due to increased neuromuscular excitability.
D. Light-headedness when standing up (orthostatic hypotension) is more related to fluid volume status or dehydration rather than directly related to the given electrolyte levels.

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A patient has experienced a myocardial infarction. On which primary blood vessel will the nurse focus care to reduce ischemia?

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Naxlex Comprehensive Predictor Exams

Correct Answer is D

Explanation

Which assessment finding will the nurse expect for a patient with the following laboratory values: sodium 145 mEq/L, potassium 4.5 mEq/L, calcium 4.5 mg/dL?

Correct Answer is C

Explanation

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