Beta-Lactams II Miscellaneous Peptide Antibiotics Lecture Objectives
63 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which 2nd generation cephalosporin is commonly used for surgical prophylaxis and endocarditis?

  • Cefotaxime
  • Ceftriaxone
  • Cefuroxime axetil (Ceftin) (correct)
  • Cefixime

Which subclass of 2nd generation cephalosporins is effective against Neisseria gonorrhoeae, Bacteroides fragilis, and Clostridium perfringens?

  • Cefprozil
  • Cefoxitin (Mefoxin) (correct)
  • Cefotaxime
  • Cefdinir

Which cephalosporin is associated with extended gram-negative activity in addition to its 1st generation spectrum?

  • Ceftriaxone (correct)
  • Cefotetan
  • Cefuroxime axetil (Ceftin)
  • Cefprozil

For which condition is Cefixime (Suprax) particularly effective among the listed cephalosporins?

<p>Gonorrhea (A)</p> Signup and view all the answers

Which cephalosporin is classified as 5th generation and is effective against MRSA, VISA, and VRSA?

<p>Ceftaroline fosamil (Teflaro) (D)</p> Signup and view all the answers

What adverse effect is commonly associated with cephalosporins as a class of antibiotics?

<p>Hypersensitivity reactions (C)</p> Signup and view all the answers

What is the route of administration for Benzathine penicillin G (Bicillin L-A)?

<p>Intramuscular (i.m.) (B)</p> Signup and view all the answers

Which type of penicillin is specifically used against Pseudomonas infections?

<p>Antipseudomonal penicillin (B)</p> Signup and view all the answers

What is the primary mechanism of physiological action of beta-lactam antibiotics?

<p>Disruption of cell wall synthesis (B)</p> Signup and view all the answers

Which type of penicillin is effective against methicillin-resistant Staphylococcus aureus (MRSA)?

<p>Antistaphylococcal penicillins (D)</p> Signup and view all the answers

What is the common route of administration for Penicillin V?

<p>Oral (p.o.) (A)</p> Signup and view all the answers

Which bacterial species is NOT included in the list of organisms mentioned in the text?

<p>Neisseria gonorrhoeae (D)</p> Signup and view all the answers

Which class of antibiotics is described as having the 'broadest spectrum' in the text?

<p>Penicillins (C)</p> Signup and view all the answers

Which of the following is NOT a mechanism of action of $eta$-lactam antibiotics described in the text?

<p>Inducing cell lysis (D)</p> Signup and view all the answers

Which of the following infections is NOT listed as a common indication for the use of piperacillin/tazobactam sodium (Zosyn)?

<p>Endocarditis (D)</p> Signup and view all the answers

Which characteristic of first-generation cephalosporins, such as cephalexin (Keflex) and cefazolin, is described in the text?

<p>Activity against Staphylococci, streptococci, and pneumococci (D)</p> Signup and view all the answers

Which bacterial enzyme is responsible for inactivation by b-lactam antibiotics?

<p>Penicillinase (B)</p> Signup and view all the answers

What is the contraindication for using most b-lactam antibiotics?

<p>Previous b-lactam allergy (D)</p> Signup and view all the answers

Which antibiotic is not cross-allergenic with other b-lactams?

<p>Aztreonam (D)</p> Signup and view all the answers

What is the mechanism of action of vancomycin?

<p>Inhibits peptidoglycan polymerization (D)</p> Signup and view all the answers

What is a common side effect of carbapenems?

<p>Seizures (D)</p> Signup and view all the answers

How does probenecid affect the renal excretion of penicillins and cephalosporins?

<p>Inhibits renal tubular secretion (B)</p> Signup and view all the answers

Which of the following is the primary spectrum of activity for penicillin G (Pen G)?

<p>Non-penicillinase producing gram-positive bacteria, spirochetes, and meningococci (D)</p> Signup and view all the answers

Which of the following penicillins is specifically designed for activity against staphylococci and streptococci?

<p>Nafcillin (D)</p> Signup and view all the answers

Which of the following penicillin combinations is effective against both gram-positive and gram-negative bacteria?

<p>Ampicillin/sulbactam sodium (Unasyn) (A)</p> Signup and view all the answers

Which of the following infections can be treated with penicillin G (Pen G)?

<p>Syphilis and endocarditis (D)</p> Signup and view all the answers

Which of the following penicillins has increased activity against gram-negative bacteria compared to penicillin G?

<p>Amoxicillin/potassium clavulanate (Augmentin, Augmentin XR) (C)</p> Signup and view all the answers

What is the primary target site for beta-lactam antibiotics like penicillins and cephalosporins?

<p>Penicillin-binding proteins (PBPs) (B)</p> Signup and view all the answers

Which of the following penicillin derivatives has the broadest spectrum of activity against gram-negative bacteria?

<p>Piperacillin (A)</p> Signup and view all the answers

Which of the following is a common side effect associated with the use of beta-lactam antibiotics like penicillins and cephalosporins?

<p>Hypersensitivity reactions (D)</p> Signup and view all the answers

What is the primary mechanism of action of beta-lactam antibiotics like penicillins and cephalosporins?

<p>Inhibition of peptidoglycan cell wall synthesis (B)</p> Signup and view all the answers

Which of the following penicillins is specifically used for the treatment of oral and pharyngeal infections?

<p>Penicillin V (D)</p> Signup and view all the answers

Which of the following is a key characteristic of the bactericidal activity of beta-lactam antibiotics?

<p>Time-dependent bactericidal activity (B)</p> Signup and view all the answers

Which factor is NOT considered when selecting the most appropriate antibiotic for a given infection?

<p>Effect on natural flora (C)</p> Signup and view all the answers

Which natural barrier limits the penetration of antibiotics to the site of infection?

<p>Lipid solubility (D)</p> Signup and view all the answers

Which category of antimicrobial agents treats a wide variety of microbial species?

<p>Broad Spectrum (A)</p> Signup and view all the answers

What can lead to superinfection by altering the nature of natural flora?

<p>Broad-spectrum antibiotics (B)</p> Signup and view all the answers

Which host factor can cause an antibiotic to accumulate to toxic levels in the body?

<p>Hepatic dysfunction (A)</p> Signup and view all the answers

Which microorganism group does isoniazid specifically act against?

<p>Mycobacteria (A)</p> Signup and view all the answers

Which of the following statements about extended-spectrum penicillins (aminopenicillins) is correct?

<p>They have an amino group added to the penicillin structure, increasing activity against Gram-negative bacteria. (C)</p> Signup and view all the answers

Which of the following bacterial infections would NOT be effectively treated by benzathine penicillin G (Bicillin L-A)?

<p>Endocarditis caused by Staphylococcus aureus (C)</p> Signup and view all the answers

Which of the following statements about penicillin V is INCORRECT?

<p>It is effective against Staphylococcus aureus infections. (C)</p> Signup and view all the answers

Which of the following statements regarding antistaphylococcal penicillins is correct?

<p>They are the drugs of choice for skin and soft tissue infections due to their activity against staphylococci and streptococci. (C)</p> Signup and view all the answers

Which of the following statements about the spectrum of activity of penicillin G is INCORRECT?

<p>It has activity against Gram-negative bacteria like Proteus mirabilis and Escherichia coli. (D)</p> Signup and view all the answers

Which of the following statements regarding the administration of benzathine penicillin G (Bicillin L-A) is correct?

<p>It is a depot formulation that releases the drug slowly over time after intramuscular injection. (B)</p> Signup and view all the answers

What is the primary mechanism that confers resistance to vancomycin in VRSA strains?

<p>Modification of the vancomycin binding site (D)</p> Signup and view all the answers

Which antibiotic class is known to concentrate in breast milk and is therefore contraindicated during nursing?

<p>Tetracyclines (C)</p> Signup and view all the answers

Which of the following is a mechanism of resistance to macrolides in gram-positive bacteria?

<p>Altered target site (50S subunit) (C)</p> Signup and view all the answers

What is the primary reason for the synergistic activity observed when aminoglycosides are combined with cell wall inhibitors?

<p>The combined effect disrupts both protein synthesis and cell wall synthesis simultaneously (D)</p> Signup and view all the answers

Which of the following tetracycline antibiotics is most suitable for use in patients with renal impairment?

<p>Doxycycline (D)</p> Signup and view all the answers

Which antibiotic class is known to cause ototoxicity and nephrotoxicity as its most serious side effects?

<p>Aminoglycosides (C)</p> Signup and view all the answers

Which of the following statements about the pharmacokinetics of tetracyclines is correct?

<p>They form non-absorbable chelates with multivalent cations and bind to tissues undergoing calcification (B)</p> Signup and view all the answers

Which of the following antibiotics is specifically designed to be resistant to enzymatic inactivation, a common mechanism of resistance to aminoglycosides?

<p>Amikacin (C)</p> Signup and view all the answers

Which of the following statements best explains why aminoglycosides are considered concentration-dependent bactericidal agents?

<p>Higher concentrations are required to exhibit a prolonged post-antibiotic effect (D)</p> Signup and view all the answers

Which of the following statements accurately describes the spectrum of activity of macrolides?

<p>Macrolides have a broad spectrum of activity against both gram-positive and gram-negative bacteria (C)</p> Signup and view all the answers

What is the primary difference between bacteriostatic and bactericidal agents?

<p>Bacteriostatic agents block the bacteria from dividing, while bactericidal agents kill bacteria. (A)</p> Signup and view all the answers

Why is it important to use bactericidal drugs for immunocompromised patients?

<p>Immunocompromised patients need the bacteria to be killed directly rather than just inhibited. (C)</p> Signup and view all the answers

Which drug combination is synergistic with any cell wall inhibitors?

<p>Beta-lactams and aminoglycosides (D)</p> Signup and view all the answers

What is a common disadvantage of combination therapy with antibiotics?

<p>Antagonistic effects between antibiotics (D)</p> Signup and view all the answers

In antibiotic resistance, what mechanism involves genetic alterations that may persist, be corrected, or be lethal?

<p>Spontaneous mutations of DNA (C)</p> Signup and view all the answers

Which alteration leads to resistance to certain antibiotics by altering target sites?

<p>Altered protein expression (A)</p> Signup and view all the answers

How does decreased accumulation of antibiotics contribute to antibiotic resistance?

<p>Decreases penetration of antibiotics to their target sites (B)</p> Signup and view all the answers

What enzyme inactivates beta-lactam antibiotics by destroying or rendering them inactive?

<p>$Beta$-lactamase (D)</p> Signup and view all the answers

More Like This

Use Quizgecko on...
Browser
Browser