Questions & explanations
1. How does a CHA2DS2-VASc score of 0 affect treatment?
A CHA2DS2-VASc score of 0 means very low stroke risk (less than 1% per year). In such patients, anticoagulants are usually not recommended because the benefit does not outweigh the bleeding risk. For example, a 60-year-old woman with no other risk factors has a score of 0 (female sex gives 1 point? Actually female sex gives 1 point only if age >=75? No, female sex is 1 point if age >=65? Wait, correct: female sex gives 1 point if age >=65? Actually, the score: female sex gives 1 point only if age >=65? No, standard: female sex is 1 point regardless? Let me check: CHA2DS2-VASc: C=1, H=1, A2=2, D=1, S2=2, V=1, A=1, Sc=1 (female). So a 60-year-old woman with no other factors has 1 point (female). So score 0 is only possible for men with no risk factors. For men with score 0, no anticoagulant is needed.
2. A patient with diabetes and heart failure believes that stress caused their conditions and that they can control them by relaxing. Using the Common-Sense Model, which illness perception dimensions are influencing their coping?
The Common-Sense Model says people form mental pictures of their illness along five key dimensions: identity (what the illness is), cause (what brought it on), timeline (how long it will last), consequences (effects on life), and controllability (can they manage it). This patient's belief that stress caused their conditions touches the cause dimension. Their belief that relaxing can control the illnesses relates to controllability. These perceptions shape how they cope—here, by trying to relax rather than taking medicines. If their perceived cause is wrong, they may ignore needed treatments. Clinicians should explore these beliefs to guide better self-management.
3. Give an example of how a clinician could use the Common-Sense Model to improve medication adherence in a patient with hypertension and arthritis who believes the medicines are unnecessary.
The clinician could first ask the patient what they think caused their high blood pressure and joint pain (cause dimension) and what they expect from treatment (controllability). If the patient believes medicines are unnecessary because they feel fine, the clinician can explain that hypertension is a 'silent' condition with long-term consequences (consequences dimension) and that daily pills control it even without symptoms. By aligning the explanation with the patient's perception—for example, 'The medicine keeps your blood vessels healthy, just like how you take pain relievers for your joints when they hurt'—the patient may see the value and adhere better.
4. Compare the focus of the Beers criteria versus the STOPP/START criteria in managing polypharmacy in older adults.
Both tools help identify potentially inappropriate medications in older adults, but they differ in scope. The Beers criteria, from the American Geriatrics Society, mainly lists specific drugs or drug classes to avoid or use with caution based on side effects and disease interactions. The STOPP/START criteria, from European experts, also includes medications that are potentially inappropriate (STOPP) but additionally lists medications that are often underused (START) — for example, recommending a statin for a patient with diabetes and heart disease. So STOPP/START is more comprehensive for both stopping harmful drugs and starting beneficial ones.
5. A patient suddenly develops hives, swelling of the lips, and difficulty breathing after eating peanuts. What do you do first?
This is anaphylaxis, a severe allergic reaction. First, call for emergency help (activate EMS). Give epinephrine (adrenaline) immediately by injection into the outer thigh muscle. Epinephrine is the only life-saving drug; it opens airways and raises blood pressure. Place the patient lying down with legs raised if they feel faint. If breathing stops, start CPR. Give oxygen if available. After epinephrine, you can give antihistamines (like diphenhydramine) and steroids (like methylprednisolone) but these are secondary. Monitor the patient closely because symptoms can return (biphasic reaction). Transport to hospital for observation.
6. What complications can happen after a joint injection, and how do you manage them?
Common complications include infection (redness, warmth, fever), bleeding, or allergic reaction to the medication. Infection is rare but serious; treat with antibiotics and possibly drainage. Steroid flare (pain and swelling a few hours after injection) can happen; treat with ice and rest. Tendon rupture can occur if steroid is injected into a tendon; avoid injecting directly into tendons. If the joint becomes hot and painful days later, suspect septic arthritis (joint infection) and aspirate fluid for culture. Always use sterile technique to reduce risk. Advise the patient to call if they have signs of infection.
7. Describe how AI could help identify new patterns of multimorbidity that are not obvious to doctors.
AI can analyze large datasets of patient records to find clusters of diseases that often occur together, beyond well-known pairs like diabetes and heart disease. For example, it might discover that patients with psoriasis, arthritis, and depression share common inflammatory pathways. These patterns can suggest new research directions for shared causes or treatments. AI can also track how multimorbidity develops over time, showing that certain diseases tend to precede others. This knowledge helps doctors anticipate future conditions and design preventive strategies tailored to each patient's disease trajectory.
8. A patient with severe asthma attack is not improving with inhaler. What do you do?
Severe asthma attack: patient cannot speak full sentences, uses accessory muscles, has wheezing or silent chest. Give high-flow oxygen to keep saturation above 90%. Give inhaled beta-agonists (like albuterol) via nebulizer every 20 minutes. Add ipratropium bromide (another bronchodilator) to the nebulizer. Give oral or intravenous steroids (prednisone or methylprednisolone) early. If no improvement, consider magnesium sulfate IV or epinephrine injection. Monitor peak flow if possible. If respiratory failure (cyanosis, confusion, exhaustion), prepare for intubation. Transfer to emergency department immediately.
9. How do you tell the difference between latent TB infection and active TB disease?
Latent TB infection means the TB bacteria are in the body but inactive. The person has no symptoms and cannot spread TB. A positive PPD or IGRA (interferon-gamma release assay, a blood test) suggests infection, but chest X-ray is normal. Active TB disease causes symptoms like cough lasting more than 3 weeks, coughing up blood, chest pain, fever, night sweats, and weight loss. Sputum samples (phlegm) are tested for TB bacteria under a microscope or by culture. Active TB is contagious and requires treatment with multiple drugs for at least 6 months. Latent TB is treated with one drug to prevent future disease.
10. A 22-year-old woman has irregular periods, acne, and excess facial hair. What is the likely diagnosis?
This suggests polycystic ovary syndrome (PCOS). Diagnosis requires two of three criteria: irregular ovulation (irregular periods), high androgen levels (acne, hirsutism), and polycystic ovaries on ultrasound. Also rule out other causes like thyroid disease. PCOS is linked to insulin resistance and obesity. Management includes lifestyle changes (diet, exercise) to improve insulin sensitivity. For irregular periods, hormonal contraceptives (pills, patch, ring) regulate cycles and reduce acne. Metformin may help with insulin resistance and ovulation. Fertility treatments are available if pregnancy is desired.
11. A patient with diabetes has a blood sugar of 450 mg/dL and is vomiting. What is the emergency?
This could be diabetic ketoacidosis (DKA), a life-threatening complication. Symptoms: high blood sugar, vomiting, abdominal pain, deep rapid breathing (Kussmaul), fruity breath odor, and dehydration. Check urine or blood for ketones. Start IV fluids (normal saline) to rehydrate. Give insulin IV (regular insulin) to lower blood sugar. Monitor potassium levels because insulin shifts potassium into cells, causing low potassium. Correct electrolyte imbalances. Look for a trigger like infection or missed insulin. Transfer to hospital for intensive monitoring. DKA requires careful fluid and insulin management.
12. Compare how a CDSS might differ in its recommendations for a young patient with a single condition versus an older patient with multimorbidity.
For a young patient with one condition (e.g., hypertension), a CDSS might recommend a standard first-line drug based on guidelines. For an older patient with multimorbidity, the CDSS should consider multiple conditions, drug interactions, and frailty. It might suggest a lower starting dose, avoid drugs that worsen other conditions (e.g., beta-blockers in asthma), and prioritize medications that treat multiple conditions (e.g., ACE inhibitors for both hypertension and heart failure). The CDSS for multimorbidity needs to be more individualized, incorporating the patient's overall health status and goals.