Hypotension and antihypertensive meds

Hey guys;

I'm a new grad and have been practicing for a few months. I have a question about hypotension and meds. Below is the scenerio.

Yesterday, my patient (CHF) had a BP of 60/D. Mild confusion when she was totally oriented before. I put her in trendelenburg and started a 250ml of IV volus per PCU protocol. Her EF was 35%. The cardiologist came in (who is moonlighting for a cardiologist who is on vacation) told me to bump the bolus up to 500ml. I put a second line in and waited for the BP to come up.

BP finally came up to 104/42. She had Coreg and Imdur ordered. I cautiously administered Imdur but held the Coreg.

Her family physician came in and was upset that Cardiology made a big deal out of her BP, said I could have sent her into acute HF. On my assessment her lungs were totally clear and had very poor skin turgor. She was definitely hypovolemic.

He was also angry that I held her Coreg and told me to give it ASAP. BP was still stable, hanging out at the 100/40's.

Was in wrong in not administering the Coreg when it was due?