One retrospective study evaluated 188 patients, with one point assigned to age > 65 years, dyspnea, no itching or erythema, laryngeal involvement, and intake of ACEi/AT-II antagonist, and two points assigned if there was no response to steroid therapy.97 If the score was ≥ 3 points, the patient was treated with C1-INH or B2 receptor antagonist for suspicion of bradykinin-mediated angioedema. Here, KNG1 is linked to angioedema.