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Prior research shows that clinical  demand  and supplier  capacity  significantly affect the  throughput  and the  wait time  within an isolated unit. However, it is doubtful whether characteristics (i.e.,  demand ,  capacity ,  throughput , and  wait time ) of one unit would affect the  wait time  of subsequent units on the patient flow process. Focusing on cardiac care, this paper aims to examine the impact of characteristics of the catheterization unit (CU) on the  wait time  of cardiac surgery unit (SU).    Methods  This study integrates published data from several sources on characteristics of the CU and SU units in 11 hospitals in Ontario, Canada between 2005 and 2008. It proposes a two-layer wait time model (with each layer representing one unit) to examine the impact of CU's characteristics on the  wait time  of SU and test the hypotheses using the Partial Least Squares-based Structural Equation Modeling analysis tool.    Results  Results show that: (i)  wait time  of CU has a direct positive impact on  wait time  of SU (    ); (ii)  capacity  of CU has a direct positive impact on  demand  of SU (    ); (iii) within each unit, there exist significant relationships among different characteristics (except for the effect of  throughput  on  wait time  in SU).    Conclusion  Characteristics of CU have direct and indirect impacts on  wait time  of SU. Specifically,  demand  and  wait time  of preceding unit are good predictors for  wait time  of subsequent units. This suggests that considering such cross-unit effects is necessary when alleviating  wait time  in a health care system. Further, different patient  risk  profiles may affect  wait time  in different ways (e.g., positive or negative effects) within SU. This implies that the wait time management should carefully consider the relationship between priority triage and risk stratification, especially for cardiac surgery.

Discovering the Impact of Preceding Units' Characteristics on the Wait Time of Cardiac Surgery Unit from Statistic Data