A patient has arrived to the emergency department with an apparent opiate narcotic overdose. The doctor asks for your recommendation to help reverse the effects of the narcotic and enable the patient's breathing to return to normal. Which of the following medications would you recommend?
Rationale:
Naloxone (Narcan) is the medication recommended to reverse the effects of an opiate narcotic overdose and restore normal breathing. Naloxone is an opioid antagonist that rapidly binds to opioid receptors, displacing narcotics and reversing respiratory depression caused by opioid toxicity. It acts quickly to counteract life-threatening respiratory compromise, making it the standard emergency treatment for opioid overdose cases.
B: Fentanyl (Sublimaze) is a potent opioid analgesic that would worsen respiratory depression rather than reverse it, thus inappropriate for treating an opioid overdose.
C: Indomethacin (Indocin) is a nonsteroidal anti-inflammatory drug used to reduce inflammation and pain, unrelated to opioid receptor activity or overdose treatment.
D: Vecuronium (Norcuron) is a neuromuscular blocker used for muscle relaxation during surgery, which would exacerbate respiratory failure rather than restore breathing in opioid overdose.
An elderly man with COPD is being managed with several drugs, one of which is inhaled ipratropium. Which of the following is the main mechanism that accounts for the beneficial effects of this drug?
Rationale:
Ipratropium works primarily by blocking an endogenous bronchoconstrictor mediator. This muscarinic antagonist inhibits acetylcholine at muscarinic receptors in airway smooth muscle, preventing bronchoconstriction. Consequently, it promotes bronchodilation in COPD patients by counteracting vagally mediated airway narrowing, improving airflow and reducing symptoms of breathlessness and wheezing associated with obstructive lung disease.
B: Inhibiting phosphodiesterase elevates cAMP but ipratropium does not affect this enzyme; it acts via muscarinic receptor blockade rather than altering intracellular cyclic nucleotide metabolism.
C: Preventing antigen-antibody reactions involves antihistamines or mast cell stabilizers; ipratropium does not modulate immune responses or mast cell mediator release.
D: Stimulating ventilatory rates targets central respiratory centers, which is unrelated to ipratropium’s peripheral anticholinergic bronchodilatory action.
In an asthma patient treated with systemic corticosteroids, bronchodilator drugs
Rationale:
Bronchodilator drugs may be used on an 'as and when required' basis in an asthma patient treated with systemic corticosteroids. Systemic corticosteroids reduce airway inflammation but do not provide immediate relief from bronchoconstriction. Therefore, bronchodilators remain essential for rapid symptom control during acute episodes or exacerbations, complementing the anti-inflammatory effects of corticosteroids without contraindications or loss of efficacy.
A: Are not needed Overlooks the necessity for immediate bronchodilation during acute bronchospasm. Systemic corticosteroids control inflammation but cannot replace the rapid symptomatic relief provided by bronchodilators.
B: Are contraindicated No evidence suggests bronchodilators are harmful alongside systemic corticosteroids; they safely provide essential reversible airway dilation during asthma exacerbations without adverse interactions.
D: Are ineffective Bronchodilators retain efficacy by relaxing airway smooth muscles, providing symptom relief even when systemic corticosteroids reduce inflammation; thus, they remain effective in managing acute bronchospasm.
You have just administered a routine breathing treatment with albuterol via small volume nebulizer. Which of the following is the best documentation that must be added to the patient's chart?
Rationale:
The best documentation to add to the patient's chart is: Aerosol therapy given with 0.5 mL albuterol and 3 mL normal saline via SVN; heart rate of 74 beats/min during therapy; B.P. stable at 120/80; respiratory rate 16/min; therapy well tolerated; chest clear on auscultation.
This option provides comprehensive details including medication dosage, delivery method, vital signs during treatment, patient tolerance, and clinical assessment post-treatment, ensuring thorough communication of care and patient response. Such detail supports continuity, legal documentation, and quality assurance in respiratory therapy practice.
A: Treatment given as ordered Omits crucial specifics like dosage, delivery method, vitals, and patient response, resulting in insufficient clinical documentation.
B: Aerosol therapy given; pulse stable, no changes during therapy; well tolerated Lacks medication dosage, delivery details, and a complete set of vital signs, limiting clinical clarity.
C: Aerosol therapy given with 0.5 mL albuterol and 3 mL normal saline; vital signs stable; well tolerated Missing delivery method, detailed vital signs, and post-treatment clinical findings reduces thoroughness of documentation.
Bromhexine acts by
Rationale:
Bromhexine acts by depolymerizing mucopolysaccharides present.
This drug facilitates mucus clearance by breaking down mucopolysaccharide fibers, reducing mucus viscosity and promoting expectoration. It targets the structure of mucus, enhancing ciliary movement and improving bronchial secretion flow, which aids in respiratory tract hygiene and symptom relief in conditions with thick mucus accumulation.
A: Inhibiting cough center bromhexine does not suppress the cough reflex; it primarily alters mucus properties rather than acting centrally on neural cough pathways.
B: Irritating gastric mucosa and reflexly increasing bronchial secretion bromhexine’s mechanism is not based on gastrointestinal irritation or reflex stimulation but on direct mucus modification.
D: Desensitizing stretch receptors in the lungs bromhexine does not modify sensory receptors; its action focuses on mucus consistency, not neural receptor sensitivity.
Bronchodilators are useful in cough
Rationale:
Bronchodilators are useful in cough only when reflex bronchoconstriction is associated.
Bronchodilators relieve cough by relaxing airway smooth muscles, specifically benefiting cases involving reflex bronchoconstriction. This action reduces airway obstruction and irritation, diminishing cough triggered by bronchospasm. They are not universally effective for all cough types but target conditions where bronchoconstriction contributes to cough pathophysiology, improving airflow and symptom control.
A: Only when cough is non-productive This limits bronchodilator use unnecessarily, as their benefit relates to bronchoconstriction presence, not secretion type or cough productivity.
B: Only when cough is associated with thick sticky secretions Focusing on secretion characteristics misses the primary mechanism of bronchodilators, which modulate airway constriction rather than secretion viscosity.
D: Irrespective of nature of cough or associated features Universal use ignores the necessity of bronchoconstriction involvement; bronchodilators are ineffective without this specific pathologic trigger present.
Which of the following is a direct bronchodilator that is most often used in asthma by the oral route?
Rationale:
Aminophylline is a direct bronchodilator most often used in asthma by the oral route. Aminophylline relaxes bronchial smooth muscles by inhibiting phosphodiesterase, increasing cAMP, leading to bronchodilation. It has systemic effects suitable for oral administration, making it a practical choice in asthma management compared to inhaled or short-acting agents. Its oral bioavailability supports long-term control.
B: Cromolyn prevents mast cell degranulation, acting as a mast cell stabilizer rather than a bronchodilator. It is primarily used for prophylaxis and not for immediate bronchodilation in asthma therapy.
C: Epinephrine acts as a rapid bronchodilator but is typically administered via injection or inhalation, not orally, due to extensive first-pass metabolism and short duration of action.
D: Ipratropium is an anticholinergic bronchodilator mainly delivered by inhalation. It is not commonly used orally and has a slower onset of action compared to direct bronchodilators like aminophylline.
Which of the following side effects can be expected after that administration of aerosolized epinephrine?
Rationale:
Tachycardia can be expected after the administration of aerosolized epinephrine. Epinephrine stimulates beta-1 adrenergic receptors in the heart, increasing heart rate and contractility, which leads to tachycardia. This effect is a common cardiovascular response observed following epinephrine administration, especially in aerosolized forms used for respiratory distress, enhancing cardiac output and oxygen delivery to tissues rapidly.
A: Laryngospasm Laryngospasm is a sudden closure of the vocal cords, usually triggered by irritation or allergy, not induced by epinephrine, which typically relaxes airway smooth muscles rather than causing spasmodic vocal cord closure.
B: Bronchospasm Bronchospasm involves constriction of bronchial muscles, whereas epinephrine acts as a bronchodilator by stimulating beta-2 receptors, leading to airway relaxation rather than bronchoconstriction.
D: Bradycardia Bradycardia refers to a slowed heart rate, contrary to epinephrine’s known effect of increasing heart rate through beta-1 receptor stimulation.
Which of the following would not be recommended for a critically ill patient with signs and symptoms of fluid overload?
Rationale:
The administration of corticosteroids would not be recommended for a critically ill patient with signs and symptoms of fluid overload. Corticosteroids can exacerbate fluid retention by promoting sodium and water retention, worsening edema and pulmonary congestion. In contrast, managing fluid overload focuses on removing excess fluid and preventing further accumulation, making corticosteroids contraindicated in this clinical scenario.
A: The initiation of diuretic therapy effectively removes excess fluid by increasing urine output, directly addressing fluid overload symptoms and improving patient status.
C: The administration of dialysis for renal failure removes toxins and excess fluid, crucial in cases where kidney function is impaired, aiding fluid balance.
D: The restriction and close monitoring of fluid intake prevent further fluid accumulation, essential in managing and controlling fluid overload effectively in critically ill patients.
The doctor ordered a metered dose inhaler bronchodilator for a 59-year-old female patient that is receiving mechanical ventilation. You should do which of the following in order to maximize aerosol deposition?
Rationale:
Placing the MDI plus a spacer in-line on the inspiratory side of the circuit maximizes aerosol deposition. This setup allows optimal delivery of medication during inspiration, reduces aerosol loss, and improves particle size distribution reaching the lungs, enhancing therapeutic effectiveness in mechanically ventilated patients. The spacer acts as a reservoir, stabilizing the aerosol for better lung deposition.
A: Place the MDI directly in-line on the expiratory side of the circuit disrupts medication delivery since aerosol is expelled during expiration, resulting in minimal drug reaching the lungs, thereby reducing treatment efficacy significantly.
B: Place the MDI directly in-line on the inspiratory side of the circuit lacks a spacer, which decreases aerosol stability and increases particle impaction in the circuit, limiting effective drug delivery to the patient's lungs.
C: Recommend that a small volume nebulizer be used instead of an MDI overlooks that MDIs with spacers are preferred for precise dosing and quicker administration, especially in ventilated patients, providing controlled and efficient aerosol delivery.
The following antitussive is suitable for treatment of dry irritant cough:
Rationale:
Benzonatate is suitable for treatment of dry irritant cough. Benzonatate acts as a peripheral antitussive by numbing the stretch receptors in the respiratory passages, reducing the cough reflex without producing sedation. It is specifically effective for non-productive, dry coughs caused by irritation, making it the preferred choice for symptomatic relief in such cases.
B: Tincture ipecacuanina induces vomiting and stimulates secretions, making it inappropriate for dry cough treatment since it worsens irritation rather than suppressing the cough reflex.
C: Potassium iodide acts as an expectorant, promoting sputum production, which is beneficial for productive coughs but unsuitable for dry, irritant coughs requiring suppression.
D: Creosote is an irritant and expectorant with potential toxicity, not ideal for dry cough as it may exacerbate irritation instead of providing symptomatic relief.
The capacity of an antihistaminic to produce sedation depends on the following except
Rationale:
The capacity of an antihistaminic to produce sedation does not depend on the ratio of H₁:H₂ blockade produced by the drug. Sedation primarily relates to central nervous system effects mediated by H₁ receptor antagonism, not H₂ receptor activity, which is mainly involved in gastric acid secretion. Therefore, the H₁:H₂ blockade ratio is unrelated to sedative potential.
A: Relative affinity for central versus peripheral H₁ receptors determines sedation because central H₁ receptor blockade directly affects the brain, causing drowsiness, unlike peripheral receptor interaction, which does not influence sedation.
B: Ability to penetrate the blood-brain barrier is crucial, as only drugs crossing into the CNS can block central H₁ receptors and induce sedation, whereas those restricted peripherally lack sedative effects.
C: Individual susceptibility affects sedation since genetic differences, age, and metabolism influence drug response variability, altering the extent to which antihistamines cause drowsiness in different people.
Which of the following will result from blockade of Hâ‚ receptors?
Rationale:
Blockade of H₁ receptors will result in increased IP₃ in gastric mucosa.
H₁ receptors are coupled to the Gq protein, which activates phospholipase C, generating IP₃ and DAG. Blocking these receptors disrupts normal signaling, causing compensatory mechanisms to elevate IP₃ levels in the gastric mucosa, reflecting the physiological response to receptor inhibition.
A: Decreased cAMP in cardiac muscle contradicts H₁ receptor function, as they primarily affect IP₃/DAG pathways rather than cAMP modulation in cardiac tissue.
B: Increased cAMP in cardiac muscle is unrelated; H₁ receptors do not directly regulate cAMP in cardiac muscle, which is primarily influenced by β-adrenergic receptors.
C: Decreased IP₃ in gastric mucosa conflicts with receptor blockade effects; inhibition typically leads to altered, often increased, IP₃ due to feedback or compensatory signaling.
Select the correct statement about salmeterol.
Rationale:
Salmeterol is a long acting selective β₂ agonist bronchodilator. It specifically targets β₂ adrenergic receptors in the bronchial smooth muscle, causing prolonged relaxation and dilation, which helps manage asthma and COPD symptoms by preventing bronchospasm. Its long duration distinguishes it from short-acting agents, making it suitable for maintenance therapy rather than immediate relief.
B: It does not possess anti-inflammatory properties; salmeterol functions purely as a bronchodilator. Anti-inflammatory effects are primarily attributed to corticosteroids, not β₂ agonists like salmeterol.
C: Salmeterol is not a β blocker; β blockers generally worsen asthma symptoms by causing bronchoconstriction, so they are unsafe for asthmatics.
D: Salmeterol is not an antihistaminic nor does it stabilize mast cells; these properties belong to drugs like cromolyn sodium, not β₂ agonists.
The first line in treatment of acute attack of bronchial asthma is the quick relief medication:
Rationale:
Inhaled $B_2$-agonist is the first-line treatment for acute bronchial asthma attacks due to its rapid bronchodilatory effect.
Inhaled $B_2$-agonists act quickly by relaxing bronchial smooth muscles, providing immediate relief from airway constriction. Their fast onset of action makes them ideal for acute asthma exacerbations, effectively reversing bronchospasm and improving airflow within minutes, which is essential for managing sudden asthma symptoms and preventing progression to respiratory distress.
B: Muscarinic antagonist inhalation Muscarinic antagonists provide bronchodilation by blocking parasympathetic receptors but have a slower onset, making them less suitable as the initial quick-relief agent during acute asthma attacks.
C: Oral theophylline Oral theophylline has a delayed onset and narrow therapeutic window, limiting its use in acute settings where immediate symptom control is critical for preventing worsening bronchospasm.
D: Cromolyn sodium orally Cromolyn sodium acts as a mast cell stabilizer with a preventive role, requiring regular use rather than providing immediate relief during sudden asthma exacerbations.
A male patient arrives to the emergency department in excruciating pain after a motor vehicle accident. The patient is screaming and appears to have multiple broken bones in his legs. Which of the following medications would you recommend for sedation?
Rationale:
Morphine sulfate is the recommended medication for sedation and pain relief in severe trauma cases like multiple broken bones.
Morphine sulfate is an opioid analgesic effective in managing intense pain and providing sedation. It acts on the central nervous system to reduce pain perception and induce calmness, making it suitable for trauma patients experiencing excruciating pain after accidents. Its rapid onset and potency are ideal in emergency settings.
A: Ibuprofen lacks the potency needed for severe trauma pain; it is a nonsteroidal anti-inflammatory drug better suited for mild to moderate pain and inflammation, not intense acute injuries.
B: Ipratropium bromide is a bronchodilator used for respiratory conditions like asthma or COPD; it has no analgesic or sedative properties relevant to trauma pain management.
D: Succinylcholine is a neuromuscular blocker used for muscle relaxation during intubation; it does not provide pain relief or sedation and is inappropriate for treating acute pain in trauma.
The Symptoms of allergen-mediated asthma result from which of the following?
Rationale:
The Symptoms of allergen-mediated asthma result from increased release of mediators from mast cells. Mast cells, when triggered by allergens, release histamine, leukotrienes, and prostaglandins that induce bronchoconstriction, mucus secretion, and inflammation. These mediators cause airway hyperresponsiveness and obstruction, directly leading to asthma symptoms such as wheezing, coughing, and shortness of breath. This mechanism underlies allergic asthma pathophysiology.
B: Increased adrenergic responsiveness of the airways enhances bronchial dilation, which typically alleviates asthma symptoms rather than causing them. It does not provoke the inflammatory or bronchoconstrictive processes defining allergen-mediated asthma.
C: Increased vascular permeability contributes to edema but is a secondary effect rather than the primary cause of asthma symptoms; it does not initiate the bronchoconstriction caused by allergen exposure.
D: Decreased calcium influx into mast cells would reduce mediator release, diminishing asthma symptoms instead of triggering them, contradicting the fundamental process of allergen-induced asthma exacerbations.
A 26-year-old female patient has arrived to the emergency room with signs of status asthmaticus. Which of the following drugs would you recommend for administration via nebulization?
Rationale:
Albuterol is the recommended drug for nebulization in status asthmaticus because it is a rapid-acting beta-2 adrenergic agonist that provides quick bronchodilation, relieving acute bronchospasm effectively. Its rapid onset and ease of administration via nebulizer make it the first-line treatment for severe asthma exacerbations requiring emergency intervention to improve airflow and oxygenation.
B: Montelukast is an oral leukotriene receptor antagonist used for long-term asthma control, not for immediate bronchodilation during acute exacerbations, making it unsuitable for nebulization in emergency settings.
C: Beclomethasone is an inhaled corticosteroid primarily used for inflammation control in chronic asthma management and lacks the immediate bronchodilatory effect needed in status asthmaticus.
D: Magnesium sulfate is administered intravenously for severe asthma exacerbations to relax bronchial muscles but is not delivered via nebulization, thus not appropriate for this question’s nebulized drug choice.
Drugs that can dilate bronchi during an acute asthmatic attack include all of the following except
Rationale:
Drugs that can dilate bronchi during an acute asthmatic attack include all of the following except Nedocromil. Nedocromil is a mast cell stabilizer used for asthma prevention, not for immediate bronchodilation during acute attacks, making it unsuitable for rapid relief compared to direct bronchodilators like epinephrine, terbutaline, and theophylline.
A: Epinephrine acts quickly on beta-2 adrenergic receptors to relax bronchial smooth muscle, effectively dilating bronchi during acute asthma episodes, providing rapid symptomatic relief and improving airflow.
B: Terbutaline selectively targets beta-2 receptors causing bronchodilation, making it effective for immediate asthma relief by relaxing airway muscles and reducing bronchospasm in emergency situations.
D: Theophylline relaxes bronchial smooth muscle by inhibiting phosphodiesterase, resulting in bronchodilation suitable for acute asthma treatment, although less commonly used due to side effects and monitoring requirements.
Which of the following terms best describes the antagonism of leukotriene's bronchoconstrictor effect (mediated at leukotriene receptors) by terbutaline (acting α adrenoceptors) in a patient with asthma?
Rationale:
Terbutaline antagonizes leukotriene's bronchoconstrictor effect through a different receptor system, exemplifying physiologic antagonism.
Physiologic antagonists work by eliciting opposing physiological responses via distinct receptors or pathways, as terbutaline stimulates β2-adrenoceptors causing bronchodilation, counteracting leukotrienes acting on leukotriene receptors that induce bronchoconstriction. This interaction involves functional opposition rather than direct receptor competition or chemical inactivation.
A: Pharmacologic antagonist competes directly at the same receptor site, which terbutaline does not, since it acts on α or β adrenoceptors, not leukotriene receptors.
B: Partial agonist activates the same receptor with less efficacy, but terbutaline binds different receptors entirely, so it cannot be classified as a partial agonist here.
D: Chemical antagonist neutralizes the agonist by direct chemical interaction, whereas terbutaline exerts its effect via physiological pathways, not chemical inactivation of leukotrienes.
The most important receptor involved in cytotoxic drug induced vomiting is
Rationale:
The most important receptor involved in cytotoxic drug induced vomiting is the Serotonin 5-HT₃ receptor. This receptor mediates emesis by triggering vagal afferent nerves in the gastrointestinal tract when stimulated by serotonin released due to chemotherapy. Antagonists targeting 5-HT₃ receptors effectively prevent nausea and vomiting, confirming its pivotal role in chemotherapy-induced emesis pathways.
A: Histamine H₁ receptor primarily regulates allergic responses and sedation rather than vomiting triggered by cytotoxic drugs, thus it lacks significant involvement in chemotherapy-induced emesis mechanisms.
C: Dopamine D2 receptor contributes to vomiting in other contexts but is less central in cytotoxic drug-induced emesis where serotonin pathways predominate.
D: Opioid μ receptor mainly modulates pain and reward circuits, with minimal direct influence on chemotherapy-induced vomiting compared to serotonin receptors.
A physician prescribes a drug for an asthmatic patient. What does this drug know that its overdose causes insomnia and arrhythmias?
Rationale:
Aminophylline is the drug known for causing insomnia and arrhythmias when overdosed. Aminophylline is a methylxanthine bronchodilator used in asthma management; it stimulates the central nervous system and cardiac muscle, leading to side effects such as nervousness, insomnia, and arrhythmias. Its narrow therapeutic window necessitates careful dosage to avoid toxicity and adverse cardiac and neurological effects.
B: Cromolyn stabilizes mast cells to prevent asthma attacks but lacks stimulant properties, so it does not cause insomnia or arrhythmias, making it unsuitable for this side effect profile.
C: Epinephrine acts as a fast-acting bronchodilator and vasoconstrictor; while it can cause palpitations, its primary use is emergency asthma treatment, not routine prescription linked to insomnia and arrhythmias in overdose.
D: Ipratropium is an anticholinergic bronchodilator with minimal systemic absorption, rarely causing central nervous side effects like insomnia or arrhythmias, hence it is not associated with these overdose symptoms.
The antiasthma drug which cannot be administered by inhalation is
Rationale:
Theophylline cannot be administered by inhalation. Theophylline is typically given orally or intravenously due to its systemic effects and narrow therapeutic index, making inhalation impractical and less effective. Its pharmacokinetics require controlled dosing, which inhalation cannot reliably provide, unlike other antiasthma drugs designed specifically for inhaled delivery to target the lungs directly with minimal systemic absorption.
B: Ipratropium bromide is designed for inhalation to provide localized bronchodilation with minimal systemic effects, making it highly effective for asthma management via inhaled routes.
C: Budesonide is an inhaled corticosteroid formulated for direct lung delivery, reducing inflammation locally while minimizing systemic side effects.
D: Terbutaline is a beta-2 agonist commonly administered by inhalation, offering rapid bronchodilation through direct airway application.
Which of the following may precipitate an asthma attack?
Rationale:
Viral and bacterial infections may precipitate an asthma attack. These infections can inflame and narrow the airways, triggering bronchospasm and increased mucus production. The immune response to pathogens heightens airway sensitivity, leading to asthma exacerbations. Infection-induced inflammation worsens airway obstruction, making breathing difficult and provoking asthma symptoms, which explains their role as common triggers for asthma attacks.
A: Respiratory acidosis results from inadequate ventilation, but it does not directly trigger asthma attacks; it is more a consequence of severe respiratory distress rather than a precipitating factor.
C: Respiratory alkalosis involves decreased carbon dioxide due to hyperventilation, which does not initiate asthma attacks but may rather be a response to airway obstruction.
D: Cranberry juice lacks any known association with asthma exacerbations and does not provoke airway inflammation or bronchospasm linked to asthma attacks.
A 23-year-old woman is using a salbutamol inhaler for frequent acute episodes of asthma and describes symptoms that she ascribes to salbutamol. Which of the following is NOT a recognized action of salbutamol?
Rationale:
Salbutamol does not have a diuretic effect.
Salbutamol primarily acts as a selective β2-adrenergic receptor agonist, causing smooth muscle relaxation in the airways, reducing bronchospasm, and relieving asthma symptoms. It can also cause skeletal muscle tremor due to β2 receptor stimulation and has a mild positive inotropic effect on the heart, but it does not promote diuresis.
B: Positive inotropic effect Salbutamol mildly enhances cardiac contractility via β1 receptor cross-activation, contributing to increased heart rate and force but is not its primary mechanism.
C: Skeletal muscle tremor Stimulation of β2 receptors in skeletal muscles by salbutamol induces tremors, a common side effect during asthma treatment.
D: Smooth muscle relaxation Salbutamol relaxes bronchial smooth muscle through β2 receptor activation, which is its main therapeutic action in asthma management.
Which of the following agents and dosage regimens is the best choice of treatment for an asthma patient with rheumatoid arthritis who is considered sensitive to aspirin (experiences bronchospasm with use)?
Rationale:
Acetaminophen, 650 mg every 4 hours is the best treatment choice for an asthma patient with rheumatoid arthritis sensitive to aspirin.
This option avoids nonsteroidal anti-inflammatory drugs (NSAIDs) that can trigger bronchospasm in aspirin-sensitive asthma patients, providing effective pain relief without exacerbating respiratory symptoms, making it safe and appropriate for managing rheumatoid arthritis symptoms in this context.
A: Ibuprofen, 800 mg three times daily triggers bronchospasm in aspirin-sensitive asthma, increasing respiratory risk; not suitable for this patient.
C: Gold injections, 25 mg intramuscularly once a week do not specifically avoid aspirin sensitivity issues and have delayed therapeutic effects, making them less ideal initially.
D: Azathioprine, 75 mg daily is an immunosuppressant with potential side effects and slower onset, not directly addressing aspirin sensitivity or immediate symptom control.
Caffeine is more powerful than theophylline in exerting the following action
Rationale:
Caffeine is more powerful than theophylline in exerting cardiac stimulation.
Caffeine’s molecular structure allows it to cross cellular membranes rapidly, enhancing its effect on cardiac tissue by increasing cyclic AMP levels, which stimulates heart rate and contractility more effectively than theophylline, making it a stronger cardiac stimulant.
A: Bronchodilatation Theophylline exhibits superior bronchodilator properties by inhibiting phosphodiesterase more potently, relaxing airway smooth muscles better than caffeine, which has a comparatively weaker effect on bronchial dilation.
C: Diuresis Theophylline induces more pronounced diuresis through its renal vasodilation and increased glomerular filtration, whereas caffeine’s diuretic effect is milder and less consistent at comparable doses.
D: Augmentation of skeletal muscle contractility Theophylline enhances skeletal muscle contractility more effectively by increasing calcium availability, surpassing caffeine’s relatively modest influence on muscle strength and contractile force.
Pharmacodynamic properties of salmeterol include:
Rationale:
Salmeterol exhibits prolonged pharmacodynamic effects allowing twice-daily dosing. This property stems from its long-acting beta-2 adrenergic receptor agonism, providing sustained bronchodilation over extended periods. The extended duration improves asthma and COPD management by maintaining airway relaxation without frequent administration, enhancing patient compliance and therapeutic outcomes compared to short-acting agents.
A: Tremor represents a common side effect of beta-2 agonists but is not a defining pharmacodynamic characteristic of salmeterol’s action or dosing schedule.
B: Exacerbation of atrial dysrhythmias relates to cardiovascular side effects occasionally seen with beta-agonists, not a fundamental pharmacodynamic property of salmeterol.
C: Hyperkalaemia is an uncommon adverse effect linked with beta-2 agonists’ systemic influence, not a pharmacodynamic attribute critical to salmeterol’s clinical use.
The following drugs are useful in management of asthma EXCEPT:
Rationale:
Leukotriene is not a drug used in the management of asthma. Montelukast is a leukotriene receptor antagonist that helps control asthma symptoms. Prednisolone is a corticosteroid that reduces airway inflammation. Ipratropium is an anticholinergic bronchodilator used for bronchospasm relief. Leukotriene itself is a biochemical mediator, not a therapeutic agent.
A: Montelukast blocks leukotriene receptors, preventing inflammation and bronchoconstriction, making it an effective asthma controller, not an exclusion in asthma treatment.
C: Prednisolone’s anti-inflammatory properties help reduce airway swelling and prevent exacerbations, making it a standard treatment in asthma management.
D: Ipratropium dilates airways by inhibiting parasympathetic activity, providing bronchodilation useful in asthma, especially during acute bronchospasm episodes.
Which of the following is a very long-acting βâ‚-selective agonist that is used for asthma prophylaxis?
Rationale:
Salmeterol is a very long-acting β₁-selective agonist used for asthma prophylaxis. It provides prolonged bronchodilation by selectively stimulating β₂-adrenergic receptors in airway smooth muscle, reducing symptoms and preventing asthma attacks. Its long duration of action makes it ideal for maintenance therapy, unlike short-acting agents, ensuring consistent airway relaxation and improved respiratory function in chronic asthma management.
A: Aminophylline Primarily acts as a phosphodiesterase inhibitor, enhancing cAMP levels non-selectively; it is not β₁-selective nor long-acting, making it unsuitable for targeted, prolonged asthma prophylaxis.
C: Epinephrine Acts as a non-selective adrenergic agonist with rapid onset; its short duration and broad receptor activity limit its use for long-term asthma prevention.
D: Ipratropium Functions as an anticholinergic bronchodilator targeting muscarinic receptors, not β-adrenergic receptors, thus it does not serve as a β₁-selective agonist for asthma maintenance.