A 71-year-old patient came to the ER complaining of shortness of breath. He was known to have COPD, HTN, HF, and IHD. His heart rate was 110 bpm, his oxygen saturation was 85%, and his blood pressure was 110/79. He had a 2 cm elevation in the jugular vein. On auscultation, his heart sounds were normal, and he had minimal lower limb edema. What is your diagnosis?