Evaluation of Effectiveness and Tolerability of Tapentadol Hydrochloride in Subjects With Severe Chronic Low Back Pain Taking Either WHO Step I or Step II Analgesics or no Regular Analgesics
Condition: Chronic Pain; Low Back Pain
MeSH terms: Back Pain; Low Back Pain; Chronic Pain
Intervention: Tapentadol PR; Observation period; Tapentadol PR
Intervention description: Tapentadol Prolonged Release (PR) Titration and Optimal Dose Period: Starting at 50 mg Tapentadol PR twice daily, adjusted with 50 mg PR steps (upwards or downwards) as necessary to achieve a balance between pain relief and a satisfactory level of tolerability. Participants were not permitted to exceed a dose of 500 mg of Tapentadol per day.; Eligibility assessment period to characterize the baseline over a one week period (week -1). Participants continued their previous treatment prior to allocation to tapentadol, if eligible.; Maintenance Period: In this period participants continued Tapentadol Prolonged Release (PR) on the dose established in the Titration and Optimal Dose Period. Tapentadol IR participants were not permitted to exceed a total daily tapentadol dose of 500 mg.
Intervention MeSH terms: Tapentadol
Phase: Phase 3
Study type: Interventional
Primary purpose: Treatment
Intervention model: Single Group Assignment
Masking: None (Open Label)
Enrollment: 208.0
Sex: All
Minimum age: 18 Years
Healthy volunteers: No
Keywords: low back pain; pain; assessment; tapentadol; centrally acting analgesic

Summary:

      The main objective of the study is to evaluate the effectiveness, tolerability, and safety of
      tapentadol hydrochloride prolonged release in subjects suffering from severe chronic low back
      pain (LBP) who are taking either WHO Step I or Step II analgesics or no regular analgesics.
      This is a clinical effectiveness trial designed to establish a link between anticipated
      clinical outcomes and the clinical practice by means of selected measures of clinical and
      subject-reported outcome.

      The trial will compare the effectiveness of previous analgesic treatment (either WHO Step I
      or Step II analgesics or no regular analgesics) with that of tapentadol hydrochloride
      prolonged release (PR) treatment during defined periods of evaluation.
    

Eligibility criteria:

        Inclusion Criteria:

          -  Participants must have signed an Informed Consent Form.

          -  Participants were men or non-pregnant, non-lactating women. Female participants must
             be postmenopausal, surgically sterile, or practicing an effective method of birth
             control. Women of childbearing potential must have a negative pregnancy test at
             screening.

          -  Participants must be appropriately communicative to verbalize and to differentiate
             with regard to location and intensity of the pain.

          -  Participants must be at least 18 years of age.

          -  Participants must have a diagnosis of chronic low back pain; chronic pain defined as
             pain lasting for at least 3 months.

          -  If the participant has radicular pain, this must have been present for at least 3
             months and stable for the 4 weeks before enrollment.

          -  Participants's pain must require a strong analgesic (defined as WHO Step III) as
             judged by the Investigator.

          -  Participants must report a rate of satisfaction with their previous analgesic regimen
             not exceeding "fair" on a subject satisfaction with treatment scale (5-point VRS).

          -  If under regular, daily pretreatment:

               -  Participants must be taking a WHO Step I or Step II analgesic medication on a
                  daily basis for at least 2 weeks prior to the Screening Visit.

               -  The Investigator considers dose increase of WHO Step I analgesics (as mono- or
                  combination therapy) and/or continuation with or dose increase of WHO Step II
                  analgesics inadequate for the individual participant, whatever applicable.

               -  Participants must have an average pain intensity score (NRS 3) greater than 5
                  points during the last 3 days prior to the Screening Visit. or

          -  If no regular analgesic pretreatment is reported:

               -  Participants must have an average pain intensity score (NRS-3) greater than 6
                  points in the last 3 days prior to the Screening Visit and related to low back
                  pain.

        Exclusion Criteria:

          -  Presence of a clinically significant disease or laboratory findings that in the
             Investigator's opinion may affect efficacy or safety assessments.

          -  Presence of active systemic or local infection that may, in the opinion of the
             Investigator, affect the efficacy, quality of life/function or safety assessments.

          -  History of alcohol or drug abuse, or suspicion of in Investigator's judgement.

          -  Presence of concomitant autoimmune inflammatory conditions.

          -  Known history of or laboratory values reflecting severe renal impairment.

          -  Known history of moderately or severely impaired hepatic function.

          -  History of or active hepatitis B or C within the past 3 months or history of HIV
             infection

          -  History of seizure disorder or epilepsy.

          -  Any of the following within 1 year: mild/moderate traumatic brain injury, stroke,
             transient ischemic attack, or brain neoplasm. Severe traumatic brain injury within 15
             years (consisting of 1 or more of the following: brain contusion, intracranial
             hematoma, either unconsciousness or post-traumatic amnesia lasting more than 24 h) or
             residual sequelae suggesting transient changes in consciousness.

          -  Pregnant or breast-feeding.

          -  History of allergy to, or hypersensitivity to tapentadol hydrochloride or its
             excipients, or contraindications related to tapentadol hydrochloride including:

          -  Participants with acute or severe bronchial asthma or hypercapnia.

          -  Participants who have or are suspected of having paralytic ileus.

          -  Employees of the Investigator or trial site, with direct involvement in this trial or
             other trials under the direction of the Investigator or trial site, as well as family
             members of employees of the Investigator.

          -  Participation in another trial concurrently or within 4 weeks prior to the Screening
             Visit.

          -  Known to or suspected of not being able to comply with the protocol and the use of the
             investigational medicinal product.

          -  Use of monoamine oxidase inhibitors within 14 days before the Screening Visit.

          -  Non-stable dosing of selective serotonin reuptake inhibitors within 30 days before the
             Screening Visit (the doses must remain stable during the trial).

          -  Presence of conditions other than low back pain that could confound the assessment or
             self evaluation of pain, e.g., anatomical deformities, significant skin conditions
             such as abscess or syndromes with widespread pain such as fibromyalgia.

          -  Any concomitant painful condition that could interfere with the subject's trial
             assessments or with their ability to differentiate low back pain from other painful
             conditions.

          -  Any painful procedures during the trial (e.g., major surgery) that may, in the opinion
             of the Investigator, affect the efficacy or safety assessments.

          -  Pending litigation due to chronic pain or disability.

          -  Intake of Step III analgesics within the 30 days prior to the Screening Visit.