Complexity complicates lean: lessons from seven emergency services.

Area of Science:

• Healthcare Management
• Process Improvement
• Operations Research

Background:

• Hospitals worldwide implement lean-inspired interventions to enhance efficiency.
• Understanding how these interventions perform across diverse clinical settings is essential.
• Variability in outcomes necessitates an examination of contextual factors.

Purpose of the Study:

• To analyze the adoption and adaptation of a hospital-wide lean intervention across different emergency services.
• To investigate the impact of these adaptations on hospital process performance data.
• To identify mechanisms through which lean influences process performance and organizational learning.

Main Methods:

• A multiple case study utilizing a realistic evaluation approach.
• Collection of four years of process performance data from seven emergency services at a Swedish University Hospital.
• Integration of qualitative data from realist interviews with quantitative performance metrics.

Main Results:

• Less complex care processes (ENT, gynecology) achieved significant improvements through better capacity-demand matching.
• More complex processes (medicine, surgery, pediatrics) showed constrained sustainable improvement due to insufficient adaptation to complexity.
• The degree of care process complexity directly influenced the success and sustainability of lean interventions.

Conclusions:

• Lean initiatives require careful adaptation to the specific complexity of care processes.
• The educational commitment of healthcare organizations is vital for successful lean implementation.
• Developing routines that support learning from daily practice is key to adapting lean effectively.