Case Report
An Atypical Case of Methemoglobinemia due to Self-Administered Benzocaine
Table 2
The clinical manifestation of methemoglobinemia [
1,
2].
| %MetHgb | Symptomology |
| 0–3 | Asymptomatic and normal level in blood | 3–15 | Possibly asymptomatic, grayish pallor, mild cyanosis, and low oxygen saturation per pulse oximeter | 15–20 | Cyanosis and chocolate-brown appearance of blood | 20–50 | Dyspnea, fatigue, weakness, headache, dizziness, and syncope | 50–70 | CNS depression, lethargy, seizures, and metabolic acidosis | >70 | Severe cyanosis and death |
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