% MetHb | Clinical effects |
---|---|
0–15 | Clinical effects unlikely |
15–30 | Mild: Cyanosis (tongue, lips, earlobe), fatigue, dizziness, headache |
30–50 | Moderate: Weakness tachycardia, tachypnoea, mild dyspnoea |
50–70 | Severe: Stupor, coma, convulsions, respiratory depression, cardiac dysrhythmias, acidosis |
>70 | Potentially fatal |