Over the last 20 years, hospitals have revised their organizational structures in response to new environmental pressures. Today, demographic and epidemiologic trends and recent technological advances call for new strategies to cope with ultra-elderly frail patients characterized by chronic conditions, high-severity health problems, and complex social situations. The main areas of change surround new ways of managing emerging clusters of patients whose needs are not efficiently or effectively

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... t within traditional hospital organizations. Following the practitioner and academic literature, we first identify the most relevant clusters of new kinds of patients who represent an increasingly larger share of the hospital population in developed countries. Second, we propose a framework that synthesizes the major organizational innovations adopted by successful organizations around the world. We conclude by substantiating the trends of and the reasoning behind the prospective pattern of hospital organizational development.