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dc.contributor.advisorEngelhardt, Barbara E-
dc.contributor.authorPrasad, Niranjani-
dc.contributor.otherComputer Science Department-
dc.description.abstractThe administration of routine interventions, from breathing support to pain management, constitutes a major part of inpatient care. Thoughtful treatment is crucial to improving patient outcomes and minimizing costs, but these interventions are often poorly understood, and clinical opinion on best protocols can vary significantly. Through a series of case studies of key critical care interventions, this thesis develops a framework for clinician-in-loop decision support. The first of these explores the weaning of patients from mechanical ventilation: admissions are modelled as Markov decision processes (MDPs), and model-free batch reinforcement learning algorithms are employed to learn personalized regimes of sedation and ventilator support, that show promise in improving outcomes when assessed against current clinical practice. The second part of this thesis is directed towards effective reward design when formulating clinical decisions as a reinforcement learning task. In tackling the problem of redundant testing in critical care, methods for Pareto-optimal reinforcement learning are integrated with known procedural constraints in order to consolidate multiple, often conflicting, clinical goals and produce a flexible optimized ordering policy. The challenges here are probed further to examine how decisions by care providers, as observed in available data, can be used to restrict the possible convex combinations of objectives in the reward function, to those that yield policies reflecting what we implicitly know from the data about reasonable behaviour for a task, and that allow for high-confidence off-policy evaluation. The proposed approach to reward design is demonstrated through synthetic domains as well as in planning in critical care. The final case study considers the task of electrolyte repletion, describing how this task can be optimized using the MDP framework and analysing current clinical behaviour through the lens of reinforcement learning, before going on to outline the steps necessary in enabling the adoption of these tools in current healthcare systems.-
dc.publisherPrinceton, NJ : Princeton University-
dc.relation.isformatofThe Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog: <a href=> </a>-
dc.subjectClinical Decision Support-
dc.subjectMachine Learning-
dc.subjectReinforcement Leaning-
dc.subject.classificationComputer science-
dc.titleMethods for Reinforcement Learning in Clinical Decision Support-
dc.typeAcademic dissertations (Ph.D.)-
Appears in Collections:Computer Science

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