Table 2.

Details of acupoint (n=16).

Author (year)	Acupoint	Waveforms	Electrical frequency	Needle Retention time (min)
Deng et al.16	ST36, ST37, JM8	NA	NA	30a
Gong et al.20	ST36	Continuous	NA	30a
Li et al.21	ST36, SP6, PC6, GV20	Continuous	2/100 Hz	30b
Long et al.22	LU7, LU9	Continuous	2 Hz, 1–2 mA	30a
Mai et al.23	ST36, ST37, ST39	Continuous	2 Hz, 2–3 mA	30b
Meng et al.24	SJ6, GB34	Continuous	2 Hz	20a
Ng et al.25	ST36, SP6, LI4, TE6	NA	100Hz	20a
Ou et al.35	ST 36	NA	NA	20a
Shen et al.27	ST36, RN16, RN17, PC6	Continuous	2/100 Hz, 2–3 mA	30b
Wang 29	ST36	Dilatational	NA	30a
Wang et al.28	ST36, ST25, ST37, ST39, CV12, PC6	NA	2 Hz, 2–3 mA	30b
Wang 30	LI9, ST39, CV12, ST25	NA	NA	20b
Wang et al.31	ST36, ST37, ST25, RN12	NA	100Hz	30a
Wei et al.32	ST36, ST37, ST39, CV6, CV8, LI4, PC6	Continuous	50–100Hz	30a
Yang et al.33	ST36, ST25	Dilatational	2/100Hz	30a
Zhang et al.34	ST36	NA	2 Hz	30a

^aPostoperation.

^bBefore operation.

NA, not available.