Photosensitive Eczemas — Flashcards

Flashcard 1: According to the 2020 update of CEAP classification, pigmentation or eczema is classified as _____

Answer: C4a

Flashcard 2: What kind of dermatitis is seen in Eczema?_____

Answer: Spongiotic

Flashcard 3: Allergic contact dermatitis is a type _____ hypersensitivity reaction

Answer: IV (Delayed-type)

Extra: Irritant contact dermatitis is a non-immunologic reaction caused by direct chemical or physical damage to the skin. In contrast, Allergic contact dermatitis is a Type IV (T-cell mediated) hypersensitivity reaction.

Flashcard 4: Photoallergic contact dermatitis has a similar presentation to other forms of allergic contact dermatitis but with a predilection for _____ sites, particularly during the initial stages.

Answer: photo exposed

Flashcard 5: _____ dermatitis presents with an intensely pruritic, oozing rash with vesicles and edema due to a type I HSR

Answer: Atopic (eczematous)

Flashcard 6: What test is done to diagnose photoallergic dermatitis?_____

Answer: Photopatch test

Flashcard 7: What are the common clinical manifestations and treatment for Chlamydia trachomatis infection?

Answer: Clinical features: Reactive arthritis, conjunctivitis, urethritis, PID. Treatment: Azithromycin or doxycycline.

Extra: Chlamydia trachomatis is an obligate intracellular bacterium. It is the most common bacterial STI. Serovars D-K cause urogenital infections.

Flashcard 8: What are the key characteristics and clinical associations of Campylobacter jejuni?

Answer: Comma-shaped, oxidase (+), grows at 42°C. Causes inflammatory diarrhea (dysentery). Associated with Guillain-Barré syndrome and Reactive arthritis.

Extra: - Morphology: Curved/Comma-shaped rods with polar flagella. - Growth: Thermophilic (grows at 42°C) on Skirrow agar. - Transmission: Poultry, puppies, unpasteurized milk. - Complications: Guillain-Barré syndrome (molecular mimicry with gangliosides) and Reactive arthritis (Reiter syndrome).

Flashcard 9: Name some important clinical conditions caused by _____?

Answer: Pseudomonas aeruginosa

Extra: Characteristics: Gram-negative bacilli, aerobic, oxidase positive. Virulence: Exotoxin A (inhibits EF-2). Treatment: Aminoglycoside + antipseudomonal penicillin (e.g., Piperacillin/Tazobactam).

Flashcard 10: What are the key microbiological characteristics and clinical manifestations of Neisseria gonorrhoeae?

Answer: Gram-negative diplococci; causes gonorrhea, PID, and septic arthritis.

Extra: - Morphology: Gram-negative diplococci. - Key Clinical Features: Gonorrhea, Septic arthritis, Neonatal conjunctivitis, PID, Fitz-Hugh-Curtis syndrome. - Treatment: Ceftriaxone + (Azithromycin or Doxycycline for potential Chlamydia coinfection). - Note: Unlike N. meningitidis, N. gonorrhoeae has NO polysaccharide capsule.