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![](/view/journals/anpr/62/4/inline-i0003-3006-62-4-135-f01.png)
Linear correlation chart between Heft-Parker visual analog scale value of preoperative pain and intraoperative pain. (a) Center SGT (r = .2). (b) Center SB (r = .4).
![Figure 1.](/view/journals/anpr/70/1/inline-i1878-7177-70-1-9-f01.png)
(a) Cold-Pressor and (b) Heat Pain Tolerance and Severity in Opioid-Using and Ppioid-Naïve Patients.
Decreased pain tolerance and increased perceived pain severity (mean, SD) in patients with chronic pain on opioid therapy vs opioid-naïve patients without chronic pain across cold-pressor and heat pain assays.
![Figure 2.](/view/journals/anpr/70/1/inline-i1878-7177-70-1-9-f02.png)
Seventy-Two–Hour Postoperative Pain Severity in Opioid-Using and Opioid-Naïve Patients.
Increased perceived postoperative pain severity as measured with a visual analog scale (0 = no pain and 10 = severe pain; mean, SD) in patients with chronic pain on opioid therapy vs opioid-naïve patients without chronic pain.
![Figure 3.](/view/journals/anpr/70/1/inline-i1878-7177-70-1-9-f03.png)
Analgesic Doses Taken During the First 72 Hours Postoperatively in Opioid-Using and Opioid-Naïve Patients.
Patients with chronic pain on opioid therapy used more analgesics (mean, SD) during the first 72 hours postoperatively vs opioid-naïve patients without chronic pain.