Hi Albert,
welcome to the forum.
Generally speaking it is very difficult to secure work before actually having relocated to Malta.
In your case, unless you have an EU or Maltese citizenship, it will be even more difficult as you will be subject to getting a work permit.
If you are entitled to Maltese citizenship I would recommend that you apply for it before you make the move to Malta.
Otherwise there are not that many hospitals in Malta. You should just try sending an e-mail to the HR departments or giving them a call. But better when you are actually in Malta. Compare Malta to Houston size-wise and you know what you can expect .
Cheers
Ricky