Which of the following agents is a respiratory analeptic?

Correct Answer: C

Rationale: Step-by-step rationale for why choice C (Bemegride) is correct: 1. Bemegride is a respiratory analeptic that stimulates the respiratory center in the brain. 2. It acts as a central nervous system stimulant, specifically targeting the respiratory system. 3. Bemegride is used to treat respiratory depression caused by drug overdose or anesthesia. 4. It helps increase respiratory rate and tidal volume by stimulating the brainstem. 5. Therefore, Bemegride is the correct choice as a respiratory analeptic. Summary of why other choices are incorrect: A: Piracetam is a nootropic drug that enhances cognitive function, not a respiratory analeptic. B: Sydnocarb is a psychostimulant used for attention deficit disorders, not a respiratory analeptic. D: Pantocrin is a medication derived from deer antlers used for various health benefits, not a respiratory analeptic.

Correct Answer: A

Rationale: Desflurane is the correct answer because it causes sympathetic activation by stimulating the central nervous system, leading to increased blood pressure and heart rate. Desflurane has a high potency in activating sympathetic responses compared to the other options. Sevoflurane and isoflurane have minimal impact on sympathetic activation. Nitrous oxide primarily acts as a weak anesthetic and does not cause significant sympathetic stimulation.

Correct Answer: B

Rationale: The correct answer is B: FALSE. Cimetidine is a known inhibitor of hepatic drug metabolism, specifically through inhibition of CYP enzymes. This leads to increased levels of certain drugs in the body. Choice A is incorrect because cimetidine does have an effect on hepatic drug metabolism. Choice C is also incorrect as it implies that all statements are true, which is not the case. Choice D is incorrect as well, as the statement is indeed false.

Correct Answer: A

Rationale: The correct answer is A: TRUE. Heparin is recommended for the treatment of deep venous thrombosis (DVT) because it prevents further clot formation and helps dissolve existing clots. Heparin works by inhibiting the formation of blood clots. Other choices (B, C, D) are incorrect because they do not align with the established medical guidelines for DVT treatment.

Correct Answer: A

Rationale: The correct answer is A: TRUE. Dihydropyridines are a class of calcium channel blockers that predominantly cause vasodilation by blocking calcium channels in vascular smooth muscle. This leads to common unwanted effects such as peripheral edema, flushing, and headaches. Therefore, it is accurate to say that the common unwanted effects of dihydropyridines are due to vasodilation. Choice B is incorrect because the statement is true. Choice C is incorrect as it implies all unwanted effects are due to vasodilation, which may not be entirely accurate. Choice D is incorrect as the unwanted effects are indeed due to vasodilation.