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Methylxanthines and Negative Inotropes Quiz
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Methylxanthines and Negative Inotropes Quiz

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Questions and Answers

Which of the following drugs are methylxanthines used to improve breathing in cardiac patients and patients with respiratory disease?

  • Theophylline and aminophylline (correct)
  • Hydrocodone and butorphanol
  • Codeine and dextromethorphan
  • Guaifenesin and propranolol
  • Most drugs that control arrhythmias of the heart are said to be 'negative inotropes.' What does this mean?

  • They increase the force of contractions.
  • They decrease the heart rate.
  • They decrease the force of contractions. (correct)
  • They increase the heart rate.
  • What drug reduces tachyarrhythmias by blocking sodium and decreasing automaticity of the cardiac cells?

  • Lidocaine (correct)
  • Procainamide
  • Propranolol
  • Digoxin
  • Hyperthyroid cats have high heart rates due to the large numbers of alpha-1 sympathetic receptors in their hearts. What drug is used to slow the heart rate and decrease arrhythmias associated with alpha-receptor stimulation?

    <p>Propranolol</p> Signup and view all the answers

    Digoxin has a narrow therapeutic index. What does this mean?

    <p>Plasma drug concentrations that produce toxicity are very low.</p> Signup and view all the answers

    Which drug is used to improve breathing in cardiac patients and patients with respiratory disease?

    <p>Theophylline and aminophylline</p> Signup and view all the answers

    What is the meaning of 'negative inotropes' in the context of drugs that control arrhythmias of the heart?

    <p>They decrease the force of contractions.</p> Signup and view all the answers

    Which drug reduces tachyarrhythmias by blocking sodium and decreasing automaticity of the cardiac cells?

    <p>Lidocaine</p> Signup and view all the answers

    What drug is used to slow the heart rate and decrease arrhythmias associated with alpha-receptor stimulation in hyperthyroid cats?

    <p>Propranolol</p> Signup and view all the answers

    What does it mean when a drug has a 'narrow therapeutic index'?

    <p>Plasma drug concentrations that produce toxicity are very low.</p> Signup and view all the answers

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