Which type of insulin has a duration of action lasting 24 hours after administration?

Detemir.

Glargine.

Humulin R.

Lispro.

Answer and Explanation

The Correct Answer is B

This question tests the classification of insulins based on their pharmacokinetic profiles. It requires identifying the specific long-acting insulin analog that provides a relatively constant basal glycemic control without a pronounced peak for 24 hours, which is vital for safe diabetes management.

Choice A rationale

Insulin detemir is a long-acting insulin analog that has a variable duration of action, typically ranging from 12 to 24 hours depending on the administered dose. It does not provide a consistent, peakless 24-hour duration for all patients.

Choice B rationale

Insulin glargine is a long-acting insulin analog designed to provide a steady, peakless, basal insulin level for 24 hours. Its chemical structure allows for slow precipitation in subcutaneous tissue, ensuring continuous, consistent release throughout the full day for diabetic control.

Choice C rationale

Humulin R is a regular, short-acting insulin. It has a rapid onset and a relatively short duration of action, typically lasting 5 to 8 hours. It is used to cover meals or for glycemic correction, not as a long-acting basal insulin.

Choice D rationale

Lispro is a rapid-acting insulin analog with an onset within 15 minutes and a duration of only 3 to 4 hours. It is designed specifically to cover mealtime glucose spikes and is never used as a long-acting basal insulin therapy.

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Correct Answer is B

Explanation

This question addresses the concept of cross-sensitivity between antibiotic classes. It requires applying the knowledge of shared chemical structures, specifically the beta-lactam ring, which is present in both penicillins and cephalosporins, creating a risk for allergic reactions in susceptible patients with documented hypersensitivities.

Choice A rationale

Sulfonamides are a chemically distinct class of antibiotics that contain a sulfonamide moiety. They do not share the beta-lactam ring structure found in penicillins and therefore do not typically exhibit cross-reactivity with penicillin-allergic patients in clinical practice.

Choice B rationale

Both penicillins and cephalosporins are beta-lactam antibiotics, sharing a common molecular beta-lactam ring structure. Because of this structural similarity, patients with a documented penicillin allergy may demonstrate cross-sensitivity when administered certain cephalosporin medications, especially early-generation agents.

Choice C rationale

Aminoglycosides are a class of antibiotics that function by inhibiting bacterial protein synthesis via the 30S ribosomal subunit. They are structurally unrelated to beta-lactams and do not present a clinical risk of cross-reactivity for patients with established penicillin allergies.

Choice D rationale

Macrolides are a class of antibiotics that inhibit protein synthesis by binding to the 50S ribosomal subunit. They are not structurally similar to penicillins or cephalosporins and are generally considered safe alternatives for patients who have documented allergies to penicillin.

A. aPTT. B. Platelet levels. C. PT/INR. D. Red blood cell count.

Correct Answer is C

Explanation

This question assesses knowledge of coagulation monitoring for vitamin K antagonists. It requires identifying the correct laboratory markers used to titrate warfarin, which is essential to achieve a therapeutic anticoagulant effect while minimizing the risk of life-threatening bleeding complications in clinical practice.

Choice A rationale

The aPTT is used to monitor the therapeutic effect of intravenous heparin therapy, which acts through the intrinsic coagulation pathway. It is not an appropriate laboratory test for monitoring the effects of warfarin, which acts on the extrinsic pathway.

Choice B rationale

While platelet levels are monitored in patients on anticoagulants to detect heparin-induced thrombocytopenia, they are not the diagnostic marker used to titrate warfarin doses. Warfarin does not significantly impact platelet counts in a way that requires dosage adjustment.

Choice C rationale

Warfarin therapy is monitored using the Prothrombin Time (PT) and the International Normalized Ratio (INR). These tests measure the time it takes for blood to clot via the extrinsic pathway, allowing for precise dosage adjustments to maintain therapeutic anticoagulation.

Choice D rationale

Red blood cell counts are used to monitor for anemia or potential hemorrhage, but they do not provide information regarding the therapeutic range of warfarin anticoagulation. They are a consequence of monitoring for safety, not a tool for medication titration.

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Which type of insulin has a duration of action lasting 24 hours after administration?

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Naxlex Comprehensive Predictor Exams

The patient tells the nurse they are allergic to penicillin. The nurse knows that if the patient is allergic to penicillin, they could be allergic to which other antibiotic class?

Correct Answer is B

Explanation

When a patient is on warfarin therapy, the prescriber monitors which of the following to determine the next appropriate dose?

Correct Answer is C

Explanation

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