Table 1.

Patient baseline characteristics

	PIH (n = 31)	no-PIH (n = 30)	P
Age overall (years)	42 [29–51]	31 [24–36]	0.007
18–24	3 (9.7)	8 (26.7)
25–34	8 (25.8)	13 (43.3)
35–44	6 (19.4)	6 (20.0)
45–54	12 (38.7)	2 (6.7)
55–64	2 (6.5)	1 (3.3)
Gender (M/F)	15/16	17/13	0.517
BMI, kg/m^2	23.06 ± 3.11	23.78 ± 3.64	0.409
ASA (I/II)	3/28	3/27	1.000
History of smoking	7 (22.6)	9 (30.0)	0.510
History of drinking	8 (25.8)	7 (23.3)	0.823
Sinus bradycardia	6 (19.4)	3 (10)	0.504
Sinus arrhythmia	1 (3.2)	0 (0)	1.00
Left ventricular high voltage	1 (3.2)	1 (3.3)	1.00
Aortic sclerosis	3 (9.7)	0 (0)	0.248
Red blood cell, 10^12/L	4.47 [3.98–4.97]	4.40 [4.21–4.91]	0.708
Hemoglobin, g/L	136.0 ± 16.9	136.3 ± 15.8	0.949
Hematocrit	0.404 [0.368–0.442]	0.402 [0.373–0.431]	0.708
Albumin, g/L	42.0 ± 3.0	43.7 ± 3.4	0.046
Propofol, mg	124 [110–140]	141 [106–156]	0.191
Sufentanil, μg	19.0 [16.5–21.0]	21.2 [16.0–23.0]	0.157
Baseline MAP, mmHg	97 ± 13	95 ± 11	0.470
Baseline HR, beats/min	76 ± 11	75 ± 13	0.749
Decrease in MAP (%)	34.9 ± 8.0	20.7 ± 7.1	< 0.001
Percentage change in HR(%)	13.9 ± 10.9	9.8 ± 18.3	0.598

BMI Body mass index, ASA American Society of Anesthesiologists physical status, $DecreaseinMAP=\left(\frac{BaselineMAP-MinimumMAP}{BaselineMAP}\right)\times 100\%$  

$PercentagechangeinHR=\left(\frac{BaselineHR-HRatminimumMAP}{BaselineHR}\right)\times 100\%$  

Normally distributed results were reported as means ± standard deviation ($\overline{x}$ ± s), while non-normally distributed data were reported as the median [interquartile range]. Categorical data were reported as numbers (%)