Table 3. Clinical studies showing some improvement in the treatment of HE following a MARS treatment References Nº patients Age (years) [aver. ±SD] Treatment Hours/patient Ammonia Pre-MARS (μg/dl) Ammonia Post-MARS (μg/dl) p Awad et al.[31] (1999) 9 38±5 73.2 130 64 <0.05 Novelli et al.[32] (2002) 10 42±12 51.2 247 126 <0.003 Schmidt et al.[33] (2001) 8 43±5 10.0 150 121 <0.05 Sorkyne et al.[34] (2001) 8 47±16 28.1 280 65 <0.005