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Defining and Describing Treatment Heterogeneity in New-Onset Idiopathic Lower Back and Extremity Pain Through Reconstruction of Longitudinal Care Sequences

Michael C Jin, Tej D Azad, Parastou Fatemi, Allen L Ho, Daniel Vail, Yi Zhang, Austin Y Feng, Lily H Kim, Jason P Bentley, Martin N. Stienen, Gordon Li, Atman M Desai, Anand Veeravagu & John K Ratliff

abstract

BACKGROUND CONTEXT
Despite established guidelines, long-term management of surgically-treated low back pain (LBP) and lower extremity pain (LEP) remains heterogeneous. Understanding care heterogeneity could inform future approaches for standardization of practices.

PURPOSE
To describe treatment heterogeneity in surgically-managed LBP and LEP.

STUDY DESIGN/SETTING
Retrospective study of a nationwide commercial database spanning inpatient and outpatient encounters for enrollees of eligible employer-supplied healthcare plans (2007-2016).

PATIENT SAMPLE
A population-based sample of opioid-naïve adult patients with newly-diagnosed LBP or LEP were identified. Inclusion required at least 12-months of pre-diagnosis and post-diagnosis continuous follow-up.

EXPOSURE
Included treatments/evaluations include conservative management (chiropractic manipulative therapy, physical therapy, epidural steroid injections), imaging (x-ray, MRI, CT), pharmaceuticals (opioids, benzodiazepines), and spine surgery (decompression, fusion).

OUTCOME MEASURES
Primary outcomes-of-interest were 12-month net healthcare expenditures (inpatient and outpatient) and 12-month opioid usage.

METHODS
Analyses include interrogation of care sequence heterogeneity and temporal trends in sequence-initiating services. Comparisons were conducted in the framework of sequence-specific treatment sequences, which reflect the personalized order of healthcare services pursued by each patient. Outlier sequences characterized by high opioid use and costs were identified from frequently observed surgical treatment sequences using Mahalanobis distance.

RESULTS
A total of 2,496,908 opioid-naïve adult patients with newly-diagnosed LBP or LEP were included (29,519 surgical). In the matched setting, increased care sequence heterogeneity was observed in surgical patients (0.51 vs 0.12 previously-unused interventions/studies pursued per month). Early opioid and MRI use has decreased between 2008 and 2015 but is matched by increases in early benzodiazepine and x-ray use. Outlier sequences, characterized by increased opioid use and costs, were found in 5.8% of surgical patients. Use of imaging prior to conservative management was common in patients pursuing outlier sequences compared to non-outlier sequences (96.5% vs 63.8%, p<0.001). Non-outlier sequences were more frequently characterized by early conservative interventions (31.9% vs 7.4%, p<0.001).

CONCLUSIONS
Surgically-managed LBP and LEP care sequences demonstrate high heterogeneity despite established practice guidelines. Outlier sequences associated with high opioid usage and costs can be identified and are characterized by increased early imaging and decreased early conservative management. Elements that may portend suboptimal longitudinal management could provide opportunities for standardization of patient care.
   
citation Jin M C, Azad T D, Fatemi P, Ho A L, Vail D, Zhang Y, Feng A Y, Kim L H, Bentley J P, Stienen M N, Li G, Desai A M, Veeravagu A, Ratliff J K. Defining and Describing Treatment Heterogeneity in New-Onset Idiopathic Lower Back and Extremity Pain Through Reconstruction of Longitudinal Care Sequences. Spine J 2021;.
   
type journal paper/review (English)
date of publishing 22-05-2021
journal title Spine J
ISSN electronic 1878-1632
PubMed 34033933
DOI 10.1016/j.spinee.2021.05.019