In this trial , @ patients diagnosed with primary or metastatic liver cancer were recruited before transcatheter arterial infusion ( TAI ) of cisplatin or oxaliplatin and randomized to either group A ( @ patients who were treated with the antiemetic tropisetron and acustimulation at the K@ acupoint for @ minutes approximately @ to @ hours before TAI on the first day and then daily for the subsequent @ days ) or group B ( @ patients who were treated with tropisetron and electrostimulation at a placebo point on the heel ) .