Standing on Shifting Ground: Clinical Decision-Making in a Non-Linear World

This paper examines clinical decision-making in a world that is fundamentally non-linear. It argues that everyday medical practice unfolds in changing phases rather than along stable, linear trajectories, and that many clinical decisions are therefore made “between thumb and forefinger” not because of imprecision, but because reality itself cannot always be captured by fixed rules. The paper analyzes the structural gap between dynamic clinical reality and formal decision tools such as guidelines and algorithms, showing how this gap forces clinicians to rely on personal judgment while simultaneously being punished for visible deviation. It further demonstrates how this tension promotes defensive medicine, in which over-treatment and risk avoidance are rational responses to organizational and legal pressure rather than biological necessity. Drawing on complexity theory, early-warning signals, and empirical studies of defensive medicine, the paper argues that medicine needs new systems capable of representing change over time, phase sensitivity, and uncertainty. It concludes that responsibility structures must evolve together with analytical tools, so that clinicians who act under dynamic conditions are supported rather than isolated.