Patients with porphyria are highly sensitive to which wavelength :: (A) 290-320 nm, (B) 400-420 nm, (C) 320-400 nm, (D) 250-290 nm
Answer is B. Porphyrin are excited by visible light with a wavelength between 400 and 410 nm and emit an intense red fluorescence. The released energy reacts with oxygen to produce free radicals and singlet oxygen that damages tissues Mc porphyria - porphyria cutaneatarda (if- Red urine - D/D - myoglobinuria )