SARAH MICHELLE CRASH COURSE STUDY GUIDE - EXAM QUESTIONS COMPLETE WITH VERIFIED ANSWERS AND DETAILED RATIONALE

SARAH MICHELLE CRASH COURSE STUDY GUIDE - EXAM QUESTIONS COMPLETE WITH VERIFIED ANSWERS AND DETAILED RATIONALE 1. A 45-year-old male presents with a rash on his palms and soles that appeared 3-5 days after starting treatment for a tick-borne illness. What is the most likely diagnosis? A) Lyme disease B) Rocky Mountain Spotted Fever C) Pityriasis Rosea D) Contact Dermatitis Correct Answer: B) Rocky Mountain Spotted Fever Rationale: The classic presentation of Rocky Mountain spotted fever includes a rash on the palms of the hands and soles of the feet that appears 3-5 days after initial symptom onset. This is a distinguishing feature that helps differentiate it from other rickettsial diseases. The rash typically begins as macules and progresses to petechiae. ________________________________________ 2. What is the first-line treatment for Rocky Mountain Spotted Fever in a pregnant patient? A) Amoxicillin B) Doxycycline C) Erythromycin D) Ciprofloxacin Correct Answer: B) Doxycycline Rationale: Doxycycline is the treatment of choice for Rocky Mountain spotted fever in ALL patients regardless of age and pregnancy status. Despite concerns about dental staining and bone growth in children and potential teratogenic effects, the benefits of treating this life-threatening infection outweigh the risks. No other antibiotic has been shown to be as effective. ________________________________________ 3. A 6-year-old child presents with a bullseye rash after a tick bite. What is the appropriate treatment? A) Doxycycline B) Amoxicillin C) Cefdinir D) Azithromycin Correct Answer: B) Amoxicillin Rationale: For Lyme disease in children under 8 years old, amoxicillin is the recommended treatment to avoid the risk of permanent tooth discoloration associated with tetracycline-class antibiotics like doxycycline. The bullseye rash (erythema migrans) is pathognomonic for early localized Lyme disease. ________________________________________ 4. What is the medical term for the bullseye rash seen in Lyme disease? A) Erythema nodosum B) Erythema multiforme C) Erythema migrans D) Erythema marginatum Correct Answer: C) Erythema migrans Rationale: Erythema migrans is the classic skin manifestation of early localized Lyme disease. It typically appears 3-30 days after the tick bite and expands gradually over days, often with central clearing creating the characteristic bullseye or target-like appearance. The rash is usually not painful or pruritic. ________________________________________ 5. A 45-year-old patient presents with painful clustered vesicles on the lips. Which condition does this most likely represent? A) Aphthous stomatitis B) Herpes simplex C) Impetigo D) Candidiasis Correct Answer: B) Herpes simplex Rationale: Herpes simplex virus infections typically present as painful clustered vesicles located on the outer lips or other mucocutaneous junctions. In contrast, aphthous stomatitis (canker sores) presents as painful ulcers inside the mouth that are not vesicular. The clustering and location help differentiate these conditions. ________________________________________ 6. A patient presents with a painful ulcer inside the mouth. Which condition is most likely? A) Herpes simplex B) Aphthous stomatitis C) Leukoplakia D) Candidiasis Correct Answer: B) Aphthous stomatitis Rationale: Aphthous stomatitis, commonly known as canker sores, presents as painful ulcers located inside the mouth. They are round or oval with a yellow-white center and red border. Unlike herpes, they are not vesicular and do not typically cluster. The pain can be significant and may interfere with eating and speaking. ________________________________________ 7. What is the recommended time frame for initiating antiviral therapy for herpes simplex? A) Within 12 hours B) Within 24 hours C) Within 48-72 hours D) Within 96 hours Correct Answer: C) Within 48-72 hours Rationale: Antiviral therapy for herpes simplex virus infections (both HSV-1 and HSV-2) should be initiated within 48-72 hours of symptom onset for maximum effectiveness. Early treatment reduces viral shedding, accelerates lesion healing, and decreases pain. After 72 hours, the benefit of antiviral therapy diminishes significantly. ________________________________________ 8. Which antiviral medication is the cheapest option for treating herpes? A) Valacyclovir B) Famciclovir C) Acyclovir D) Ganciclovir Correct Answer: C) Acyclovir Rationale: Acyclovir is the least expensive antiviral medication for treating herpes simplex infections. While valacyclovir and famciclovir offer improved bioavailability and less frequent dosing, acyclovir remains effective and is often the preferred choice for cost-conscious patients. Dosing typically requires more frequent administration (5 times daily). ________________________________________ 9. A child presents with honey-crusted lesions on the face. What is the most likely diagnosis? A) Herpes simplex B) Impetigo C) Atopic dermatitis D) Contact dermatitis Correct Answer: B) Impetigo Rationale: Impetigo is a superficial skin infection characterized by honey-colored crusted lesions, most commonly seen in children. The crusts form when vesicles or pustules rupture and exudate dries. The condition is highly contagious and commonly affects the face and