Participants with AHA who are receiving OBIZUR injection or initiate OBIZUR Injection treatment for the first time will be enrolled. Both retrospective and prospective participants data will be collected. Retrospective data will be collected from the date of first treatment with OBIZUR injection after the marketing authorization in Korea but before date of signed informed consent and prospective data will be collected from the date of signed informed consent. The treatment and follow up of the participants will be determined by the treating physicians according to her/his routine practice.

OBIZUR injection.

Number of participants with AEs, causality to AEs, SAEs and AESI will be reported. The investigator will assess the causal relationship (causality) between the medicinal product and the AE using his/her clinical expertise and judgment.

Unexpected AE is defined as AE that differs from the information in the product label in nature, severity, specificity, or outcome.

An ADR refers to any undesirable and unintended reaction which occurs during or following the administration of the drug, and in which a causal relationship with the drug cannot be ruled out. In the event that a causal relationship with the drug remains unknown amongst reported adverse events, such reaction shall be considered an adverse drug reaction. Serious ADR means noxious or unintended response to a drug that occurs at any dosage and that requires in-patient hospitalization or prolongation of existing hospitalization, causes congenital malformation, results in persistent or significant disability or incapacity, is life-threatening or results in death. Unexpected ADRs is defined as ADR that differs from the information in the product label in nature, severity, specificity, or outcome.

SSR include following events: Pregnancy: any case in which a pregnancy participant is exposed to a Takeda Product or in which a female participant or partner of a male participant becomes pregnant following Takeda product.; Breastfeeding: infant exposure from breast milk; Overdose: all information of any accidental or intentional overdose; Drug abuse, misuse or medication error: all information on medicinal product (MP) abuse, misuse of medication error (potential or actual); Suspected transmission of infectious agent: Suspected (in sense of confirmed or potential) transmission of infectious agent by a MP; Lack of efficacy of Takeda Product; accidental/occupational exposure; Use outside the terms of the marketing authorization, also known as "off-label" and "off-label use"; Use of falsified and counterfeit MP; Drug-drug and drug-food interactions; Inadvertent or accidental exposure with or without an AE; Unintended benefit.

Overall Bleeding Control will be determined as either bleeding stopped or did not stop.