Final answer:
The effectiveness of a paracentesis is indicated by a decreased shortness of breath, as it shows reduced pressure on the diaphragm and improved respiratory function.
Step-by-step explanation:
The question pertains to the assessment of a client following a paracentesis, a procedure to remove fluid (ascites) from the abdominal cavity. When evaluating the effectiveness of a paracentesis, the nurse should look for a decreased shortness of breath because the removal of excess fluid should alleviate pressure on the diaphragm and improve respiratory function. Other findings, such as the presence of a fluid wave, increased heart rate, and equal pre- and postprocedure weights, are not indicators of an effective paracentesis. The presence of a fluid wave would actually suggest remaining fluid, an increased heart rate could be a sign of other complications or anxiety, and weight should be reduced after fluid removal if the procedure is successful.