Clinical trial NCT03881124: Pain Trajectories in Severe Persistent Inguinal Post-herniorrhaphy Pain
Official title: Pain Trajectories in Severe Persistent Inguinal Post-herniorrhaphy Pain
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Chronic Pain
Keywords: Inguinal Herniorrhaphy
Hernia
Persistent postsurgical pain
Long term follow up
Quantitative sensory testing (QST)
Pain trajectory
Explanatory variables
Lead sponsor: University of Copenhagen
Sponsor class: OTHER
First posted: 2019-03-19
Enrollment: 95
Sex: ALL
Minimum age (years): 18
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: RETROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Patients with severe persistent pain after groin hernia repair with psychophysical disability referred to a dedicated tertiary center on a nationwide basis.

Brief summary: Severe persistent postsurgical pain (PPP) remains a major healthcare challenge. In the third most common surgical procedure in the UK, inguinal herniorrhaphy, including 85,000 surgeries in 2015, an estimated 1,500 to 3,000 patients will annually develop severe PPP. While the trajectory of PPP is generally considered a continuation of the acute post-surgery pain, recent data suggest the condition may develop with a delayed onset. The present study evaluated pain-trajectories in a consecutive cohort referred to a tertiary PPP-center. Explanatory variables based on individual psychometric, sensory and surgical profiles were analysed.

Detailed description: Severe persistent post-surgical pain (PPP) is a prevalent medical problem leading to impairment of physical and psycho-social functions in a large number of individuals.Severe PPP may significantly influence 4-8% of the surgical population, depending primarily on the surgical procedure and technique, but also patient-related pre-surgical factors.Updated criteria for PPP have recently been suggested. Inguinal herniorrhaphy qualifies for PPP-research due to a high surgical volume. Paradoxically, while the surgery is considered a minor procedure with limited tissue damage it is carried out in a territory with abundant nerve and vascular supply, and, complex musculoskeletal functions essential for locomotor actions. Persistent pain after inguinal herniorrhaphy may develop after a seemingly successful surgical procedure, and, is seen in a severe form in 2-4% of the patients associated with significant deterioration of the health-related quality of life.

The transition process from acute to persistent pain may be more complex than previously assumed, making the study of temporal pain trajectories interesting. Based on clinical experience from a nationwide research center in PPP following inguinal herniorrhaphy, the authors decided first, to perform a prospective exploratory cohort study examining graphical pain charts by planimetrics, attempting to construct a valid statistical sub-classification of the trajectories. Secondly, the relationship between the sub-classification of the trajectories, and, potential explanatory variables, based on individual profiles of pain, psychometrics, quantitative sensory testing, and surgical procedures, were analysed, using principal component analysis and logistic regression models.

Eligibility criteria: Inclusion Criteria:

* Patients with severe persistent pain (\>6 mo) after groin hernia repair referred to our center for PPP

Exclusion Criteria:

* Unable to cooperate with the sensory examinations

Primary outcomes:
measure: Group I pain trajectories
timeFrame: 2014-2016
measure: Group II pain trajectories
timeFrame: 2014-2016
measure: Group III pain trajectories
timeFrame: 2014-2016
measure: Group IV pain trajectories
timeFrame: 2014-2016
Secondary outcomes:
measure: Pain intensity
timeFrame: 2014-2016
measure: Activity of Daily Living (ADL) score
timeFrame: 2014-2016
measure: Assessments of Anxiety and Depression
timeFrame: 2014-2016
measure: Assessment of Pain Catastrophizing
timeFrame: 2014-2016
measure: Quantitative sensory testing (QST)
timeFrame: 2014-2016
measure: painDETECT
timeFrame: 2014-2016
measure: S-LANSS
timeFrame: 2014-2016
Other outcomes:
Locations:
Study officials:
References:
citation: Chapman CR, Vierck CJ. The Transition of Acute Postoperative Pain to Chronic Pain: An Integrative Overview of Research on Mechanisms. J Pain. 2017 Apr;18(4):359.e1-359.e38. doi: 10.1016/j.jpain.2016.11.004. Epub 2016 Nov 28.
citation: Pogatzki-Zahn EM, Segelcke D, Schug SA. Postoperative pain-from mechanisms to treatment. Pain Rep. 2017 Mar 15;2(2):e588. doi: 10.1097/PR9.0000000000000588. eCollection 2017 Mar.
citation: Kehlet H, Jensen TS, Woolf CJ. Persistent postsurgical pain: risk factors and prevention. Lancet. 2006 May 13;367(9522):1618-25. doi: 10.1016/S0140-6736(06)68700-X.
citation: Werner MU, Bischoff JM. Persistent postsurgical pain: evidence from breast cancer surgery, groin hernia repair, and lung cancer surgery. Curr Top Behav Neurosci. 2014;20:3-29. doi: 10.1007/7854_2014_285.
citation: Werner MU, Kongsgaard UE. I. Defining persistent post-surgical pain: is an update required? Br J Anaesth. 2014 Jul;113(1):1-4. doi: 10.1093/bja/aeu012. Epub 2014 Feb 18. No abstract available.
citation: Werner MU. Management of persistent postsurgical inguinal pain. Langenbecks Arch Surg. 2014 Jun;399(5):559-69. doi: 10.1007/s00423-014-1211-9. Epub 2014 May 23.
citation: Gartner R, Jensen MB, Nielsen J, Ewertz M, Kroman N, Kehlet H. Prevalence of and factors associated with persistent pain following breast cancer surgery. JAMA. 2009 Nov 11;302(18):1985-92. doi: 10.1001/jama.2009.1568.
citation: Reinpold WM, Nehls J, Eggert A. Nerve management and chronic pain after open inguinal hernia repair: a prospective two phase study. Ann Surg. 2011 Jul;254(1):163-8. doi: 10.1097/SLA.0b013e31821d4a2d.
citation: McCarthy M Jr, Jonasson O, Chang CH, Pickard AS, Giobbie-Hurder A, Gibbs J, Edelman P, Fitzgibbons R, Neumayer L. Assessment of patient functional status after surgery. J Am Coll Surg. 2005 Aug;201(2):171-8. doi: 10.1016/j.jamcollsurg.2005.03.035.