5-Aminolevulinic acid-induced severe hypotension during transurethral resection of a bladder tumor: a case report

Abstract

BACKGROUND Although 5-aminolevulinic acid (5-ALA) is used for the photodynamic diagnosis of bladder tumors, hypotension is the most commonly observed adverse effect. We present a case of 5-ALA-induced severe hypotension during transurethral resection of a bladder tumor. CASE PRESENTATION A 68-year-old man underwent transurethral resection of a bladder tumor using 5-ALA under general anesthesia. Three hours before anesthesia induction, ALA 20 mg/kg was administered orally. After anesthesia induction, his blood pressure decreased to 47/32 mmHg. Although we used phenylephrine and ephedrine, hypotension persisted at 50/33 mmHg. Bolus administration of noradrenaline slightly increased his blood pressure to 65/39 mmHg. Following this, bolus administration of adrenaline elevated his blood pressure. We decided to perform surgery under continuous administration of adrenaline. CONCLUSIONS Our case report suggests that anesthesiologists should consider 5-ALA-induced hypotension as a differential diagnosis for hypotension occurring after anesthesia induction. Moreover, ephedrine and phenylephrine might be less effective in treating this condition.