Online Application Follow Up

I've been applying for hospital jobs and wanted some advice. I apply online via a basic website form (meaning that it's not my poor resume skills that is not getting me calls). Sometimes HR calls me and then I never hear from the Nurse Manager of the specific unit I am applying for. It's hard to follow up since I don't have contact information for anyone that might actually care about my application (someone on the unit). Should I seek this information out and call managers? Waiting for calls is not working. I know I am qualified, so I don't know what I'm doing wrong.