The client with a myocardial infarction comes to the nurse's station stating that he is ready to go home because there is nothing wrong with him. Which defense mechanism is the client using?

Correct Answer: B

Rationale: The correct answer is B: Denial. The client displaying denial refuses to acknowledge the reality of having a myocardial infarction. Rationalization (choice A) involves making excuses for behavior, not denying a condition. Projection (choice C) is attributing one's thoughts or feelings to others, not denying an illness. Conversion reaction (choice D) is converting psychological distress into physical symptoms, which is not evident in this scenario. Therefore, denial is the defense mechanism being used in this situation.

Correct Answer: A

Rationale: AST, choice A, would be the least effective in diagnosing a myocardial infarction as it is not specific for this condition. Troponin, CK-MB, and myoglobin (choices B, C, and D) are more specific markers for myocardial infarction. Troponin is considered the gold standard due to its cardiac specificity. CK-MB is also specific to the heart, and its isoenzyme levels elevate post-heart damage. Myoglobin, although elevated in myocardial infarction, is not as specific as troponin and CK-MB and can also increase in conditions like burns and muscle trauma. Therefore, AST is the least effective choice for diagnosing a myocardial infarction.

Correct Answer: C

Rationale: The least helpful question in obtaining information regarding intussusception is "Describe his usual diet."? This question is least relevant to the specific symptoms and presentation of intussusception. Choices A, B, and D are more directly related to symptoms commonly associated with intussusception and can provide important diagnostic clues. Asking about pain, vomit appearance, and changes in abdominal size can help in assessing the severity and progression of the condition, making them more crucial questions to ask in this scenario. Pain is a cardinal symptom of intussusception, changes in vomit appearance may indicate gastrointestinal issues, and alterations in abdominal size can signify the presence of a mass or obstruction, all of which are pertinent in diagnosing and managing intussusception.

Correct Answer: D

Rationale: The mothers in answers A, B, and C all require RhoGam as they are Rh negative with an Rh-positive baby or have experienced a stillbirth delivery, making them candidates for RhoGam injection. The mother in answer D is the only one who does not require Rhogam because she is Rh negative with an Rh-negative baby, eliminating the need for RhoGam administration.

Correct Answer: A

Rationale: During a Tensilon test to check for Myasthenia Gravis, Atropine sulfate should be kept available as it is the antidote for Tensilon and is administered to manage cholinergic crises that may occur during the test. Atropine sulfate helps counteract the excessive stimulation of the parasympathetic nervous system caused by Tensilon. Furosemide (choice B) is a diuretic and not related to managing Tensilon-induced crises. Prostigmin (choice C) is used to treat Myasthenia Gravis itself, not for managing the effects of Tensilon. Promethazine (choice D) is an antiemetic and antianxiety agent, which is not necessary for a Tensilon test. Therefore, Atropine sulfate (choice A) is the correct medication to have available during a Tensilon test, making choices B, C, and D incorrect in this context.