Final answer:
The nurse should report the presence of diffuse bilateral crackles to the health care provider immediately.
Step-by-step explanation:
The information that the nurse should report to the health care provider immediately is b. The patient has diffuse bilateral crackles. The presence of crackles indicates fluid in the lungs, which can be a sign of worsening mitral valve regurgitation and potentially lead to pulmonary edema. This requires immediate medical attention to prevent further complications.