Table 7 Warning symptoms and signs of AIFRS among COVID-19 patients

• Nasal discharge—mucoid, purulent, blood-tinged or black

• Nasal mucosal erythema, inflammation, purple or blue discoloration, white ulcer, ischemia, or eschar

• Nasal stuffiness

• Epistaxis

• Foul smell

• Worsening headache

• Facial pain

• Regional pain – orbit, paranasal sinus or dental pain

• Ocular motility restriction, diplopia

• Eyelid, periocular or facial edema

• Eyelid, periocular, facial discoloration

• Sudden ptosis

• Proptosis

• Sudden loss of vision

• Fever, altered sensorium, paralysis, focal seizures

• Facial paresthesia, anesthesia

• Facial palsy