Pericardial Effusion

My husband had had 2 echocardiograms in past month.  Doctor wants to perform pericardiocentesis.  Is their any non-invasive way to make fluid go away?...In past month he has also dropped 10 pounds and taken serious look at eating habits (salt, calories, etc).  He is 6'2" an now 260 lbs.
Interpretation says moderate pericardial effusion with early tamponade physiology.  
Numbers from 1st / 2nd test... End Diastolic Diam 50mm / 56mm, End Systolic Diam. 43mm / 42mm, LVPW Thick 17mm/13mm, IVS Thick 10mm/13mm, Ejection Fraction 50%/36%  1st test impression said NL LVSF with EF=50-55%, Mild LVH, Diastolic dysfunction, Mild MR/TR/PI....2nd test impression said NL LVSF with EF=50-55%, Mild LVH, There is abnormal spetal motion wich may be a wall motion abnormality or due RV overload motion., Diastolic dysfunction, Mild MR/TR/PI
Thanks in advance for your thoughts.