Triggers to a remote database

Hello all!

We make use of a PACS (Picture Archiving and Communication System) and
system to store DICOM (Digital Imaging and Communication in Medicine)
images (like CT scans, MR images etc.) in our Oncology Center. This PACS
system uses mysql as it's native database, in which it stores certain
data as date and time of the examination, it uses InnoDB tables.

We are building another application around it, which will use data from
the PACS tables and will hold additional data in a seperate database in
it's own tables.

Every study has it's own unique identifier which is stored in the PACS
database. Additional data is stored in the additional database, under
the same unique identifier to be able to keep track of the data and link
it to each other.

Now I would like to know if it is possible to add a trigger to the PACS
database which will delete the related information in the additional
database if a record in the PACS database is dropped. This trigger will
have to delete the records in the additional tables before dropping the
data in it's own database, so we can maintain a more compact database
and don't store data which we cannot link to the PACS system anymore.

Hope someone can help me.

Thanks in advance,

Jonathan