Pre- and Postoperative Evaluation by Photoplethysmography in Patients Receiving Surgery for Lower-Limb Varicose Veins

Table 1

Venous refill times (seconds) for 41 lower limbs in the pre- and postoperative periods, with and without tourniquet use (Botucatu CH-FM, SP, 2012).

Period	Preoperative			Postoperative
Description	No tourniquet	Thigh tourniquet	Leg tourniquet	No tourniquet
Number of limbs	41	41	41	41
Arithmetic average	13.37	21.63	20.00	26.10
Standard deviation	3.22	5.84	7.01	5.09
Median	13.00	23.00	22.00	28.00
Minimum value	7.00	10.00	9.00	14.00
Maximum value	19.00	32.00	32.00	32.00
Normal distribution	No	Yes	Yes	No
Confidence interval	12.35–14.38	19.79–23.48	17.79–22.21	24.49–27.70