Concentration of methemoglobin to appears cyanosis
a. 5 gm/dlb. 2 gm/dl
c.1.5 gm/dl
d. l2gm/dl
e. 2.5 gm/dl
Ans: (C) 1.5 gldl
• Methemoglobinemia is a
condition in which the iron within hemoglobin is oxidized from the ferrous
(Fe2) state to the ferric (Fe3) state, resulting in the inability to transport
oxygen and carbon dioxide. Clinically, this condition causes cyanosis.
• Methemoglobinemia in children usually results from
exposure to
• Oxidizing substances: nitrates
or nitrites, aniline dyes, or medications, including lidocaine, prilocaine, and
phenazopyridine hydrochloride.
