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Asian Spine J. 2014 Apr;8(2):190-6. doi: 10.4184/asj.2014.8.2.190. Epub 2014 Apr 8.

Effectiveness of preemptive analgesia using a frequency rhythmic electrical modulation system in patients having instrumented fusion for lumbar stenosis.

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Anesthesia Clinics, Dışkapı Yıldırım Beyazıt Education and Research Hospital, Ankara, Turkey.
Spinal Surgery Division of Neurosurgery Clinic, Private Koru Hospital, Ankara, Turkey.



A randomized prospective study.


To assess postoperative analgesic requirements after Phyback therapy preemptively in patients undergoing lumbar stabilization.


Frequency Rhythmic Electrical Modulation System is the latest method of preemptive analgesia.


Forty patients were divided into two groups. Patients who were to receive tramadol were allocated to "group A" and those who were to receive Phyback therapy were allocated to "group B." In patients with a visual analog scale score of >4 or a verbal rating scale score of >2, 75 mg of diclofenac IM was administered. The amount of analgesic consumption, the bolus demand dosage, and the number of bolus doses administered were recorded. Patient satisfaction was evaluated using the visual analog patient satisfaction scale.


There were statistically significant differences in the visual analog scale and verbal rating scale scores in the fourth, sixth, 12th, and 24th hours. The number of bolus infusions was significantly lower in group B. The amount of analgesic consumption was higher in group A. There was a significant difference between the two groups in the number of bolus infusions and the total amount of analgesic consumption, and this comparison showed better results for group B.


Application of Phyback therapy reduced postoperative opioid consumption and analgesic demand, and it contributed to reducing patients' level of pain and increased patient satisfaction. Moreover, the application of preemptive Phyback therapy contributed to reducing preoperative pain which may have reduced patient anxiety.


Analgesics; Electric stimulation therapy; Postoperative pain; Preanesthetic medication; Spinal stenosis

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