A patient is in the intensive care unit because of an acute myocardial infarction. He is experiencing severe ventricular dysrhythmias. The nurse will prepare to give which drug of choice for this dysrhythmia?

Correct Answer: C

Rationale: 1. Amiodarone is the drug of choice for severe ventricular dysrhythmias like those seen in acute myocardial infarction. 2. It has potent antiarrhythmic properties and can stabilize the heart's electrical activity. 3. Diltiazem and verapamil are calcium channel blockers used for supraventricular dysrhythmias, not ventricular. 4. Adenosine is used for terminating supraventricular tachycardias, not ventricular dysrhythmias. 5. Choosing amiodarone in this scenario is crucial for managing the life-threatening ventricular dysrhythmias effectively.

Correct Answer: B

Rationale: The correct answer is B: Oily solutions can be injected. In the intramuscular route of drug administration, oily solutions can be injected due to the higher vascularity of muscle tissues, allowing for slower absorption and prolonged drug release. Oily solutions facilitate the absorption of lipid-soluble drugs. This route is suitable for drugs that require sustained release or have poor water solubility. Choices A and C are incorrect because not only water solutions but also oily and other types of solutions can be injected intramuscularly. Choice D is incorrect as intramuscular administration generally results in faster onset of action compared to oral administration.

Correct Answer: A

Rationale: Drug resistance refers to the ability of microbes or cancer cells to withstand the effects of drugs designed to kill or inhibit their growth. This loss of effectiveness is a significant concern in healthcare. Therefore, the statement that drug resistance is a term used to describe the loss of effectiveness of antimicrobial or antitumour drugs is TRUE. Summary of other choices: - B: FALSE - Incorrect, as drug resistance is a real phenomenon affecting the efficacy of drugs. - C: None of the above - Incorrect, as option A is correct. - D: All of the above - Incorrect, as not all options are valid; only option A is correct.

Correct Answer: D

Rationale: The correct answer is D: All of the above. Dibucaine, Lidocaine, and Mepivacaine are all local anesthetics commonly used for infiltrative and regional anesthesia. These agents work by blocking sodium channels, preventing the generation and propagation of action potentials in nerves. They are effective for producing anesthesia in a localized area, making them suitable for procedures like dental work, minor surgeries, and nerve blocks. Each of these local anesthetics has a slightly different onset, duration, and potency, allowing for flexibility in choosing the most appropriate agent based on the specific clinical situation. Therefore, choosing all of the above options is correct as they are all suitable choices for infiltrative and regional anesthesia.

Correct Answer: B

Rationale: The correct answer is B: Hexamethonium. Ganglion-blocking drugs act by blocking nicotinic receptors in autonomic ganglia, leading to decreased sympathetic and parasympathetic responses. Hexamethonium is a ganglion-blocking drug that specifically acts on ganglionic nicotinic receptors. - A: Homatropine is a muscarinic antagonist used to dilate the pupil. - C: Rapacuronium is a non-depolarizing neuromuscular blocking agent. - D: Edrophonium is an acetylcholinesterase inhibitor used for the diagnosis of myasthenia gravis.