Today, Monroe had his first recheck after starting his heart meds. He seems to be doing ok, but he started coughing two days ago. That scared me a bit.
His vet is not convinced though that the cough is heart-related, because coughing is much more uncommon in heartfailure cats than it is in heartfailure dogs. She told me to keep an eye on it.
Otherwise, his kidneys are tolerating all the meds well. His x-rays are still showing fluid in his chest, but she didn't increase his furosemide ("fluid pill") yet, because he will start another(!) medicine, and she did not want overburden his system right now. This will be the fourth heart medicine.
So overall he's doing well, and he gained a little weight. He will go back in two weeks.