Transcutaneous Electrical Nerve Stimulation on the PC-5 and PC-6 Points Alleviated Hypotension after Epidural Anaesthesia, Depending on the Stimulus Frequency

Table 2

Haemodynamic data and dose of ephedrine. Data are median (range) or number (percentage). SBP: systolic blood pressure. ^†: significantly different from the control group. *: significantly different from the 40 Hz group.

	Control (𝑛=14)	2 Hz (𝑛=14)	10 Hz (𝑛=13)	20 Hz (𝑛=13)	40 Hz (𝑛=13)	𝑃
Intensity of TENS (mA)	—	13 (9–17)	12 (9–15)	13 (9–15)	13 (9–15)	0.721
Baseline SBP (mmHg)	130 (104–150)	135 (115–145)	130 (110–145)	130 (114–145)	132 (116–158)	0.994
Lowest SBP (mmHg)	84 (74–110)*	96 (62–116)*	100 (68–110)	96 (64–115)*	104 (75–140)	0.004
Baseline HR (beats min^−1)	72 (56–98)	76 (56–105)	70 (60–85)	70 (54–85)	75 (55–105)	0.343
HR at lowest SBP (beats min^−1)	62 (45–80)	64 (40–76)	61 (44–86)	55 (45–75)	65 (50–95)	0.522
Incidence of hypotension (𝑛)	11 (78%)	6 (43%)	5 (38%)	5 (38%)	1 (8%)^†	0.008
Ephedrine (mg)	0 (0–16)	8 (0–20)	0 (0–8)	0 (0–12)	0 (0–8)^†	0.013