Edema and ascites are sx of Right sided heart failure. Right sided heart failure ofter causes left sided heart failure. Pt probably has some liver dissorder causing these sx (ie. cirrhosis, CA, ). You never mentioned if you got a room air SAO2 and If the patient wasn't grossly hypertensive, I would have held on the NTG and possibly the LAsix also. You didn't indicate the level of distress for this patient, so it is difficult to assess how agressive this patient treatment needs to be.
Could the ascites have cause this patient's dyspnea?? Although he did miss his AM dose of PO lasix, and was probably fluid overloaded he may not have required a full 1 mg/kg of lasix. I would have consulted with the Doc for a dose and any futher orders.