RESEARCH SUPPORT, NON-U.S. GOV'T
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Cost implications of testing strategy in patients with syncope: randomized assessment of syncope trial.

OBJECTIVES: We sought to assess the cost implications of two investigation strategies in patients with unexplained syncope.

BACKGROUND: Establishing a diagnosis in patients with unexplained syncope is complicated by infrequent and unpredictable events. The cost-effectiveness of immediate, prolonged monitoring as an alternative to conventional diagnostic strategies has not been studied.

METHODS: Sixty patients (age 66 +/- 14 years; 33 males) with unexplained syncope and LV ejection fraction >35% were randomized to conventional testing with an external loop recorder, tilt and electrophysiologic (EP) testing, or prolonged monitoring with an implantable loop recorder with one-year monitoring. If patients remained undiagnosed after their assigned strategy, they were offered a crossover to the alternate strategy. Cost analysis of the two testing strategies was performed.

RESULTS: Fourteen of 30 patients who were being monitored were diagnosed at a cost of 2,731 Canadian dollars +/- 285 Canadian dollars per patient and 5,852 Canadian dollars +/- 610 Canadian dollars per diagnosis. In contrast, only six of 30 conventional patients were diagnosed (20% vs. 47%, p = 0.029), at a cost of 1,683 Canadian dollars +/- 505 Canadian dollars per patient (p < 0.0001) and 8,414 Canadian dollars +/- 2,527 Canadian dollars per diagnosis (p < 0.0001). After crossover, a diagnosis was obtained in 1 of 5 patients undergoing conventional testing, compared with 8 of 21 patients who completed monitoring (20% vs. 38%, p = 0.44). Overall, a strategy of monitoring followed by tilt and EP testing was associated with a diagnostic yield of 50%, at a cost of 2,937 Canadian dollars +/- 579 Canadian dollars per patient and 5,875 Canadian dollars +/- 1,159 Canadian dollars per diagnosis. Conventional testing followed by monitoring was associated with a diagnostic yield of 47%, at a greater cost of 3,683 Canadian dollars +/- 1,490 Canadian dollars per patient (p = 0.013) and a greater cost per diagnosis (7,891 Canadian dollars +/- 3,193 Canadian dollars, p = 0.002).

CONCLUSIONS: A strategy of primary monitoring is more cost-effective than conventional testing in establishing a diagnosis in recurrent unexplained syncope.

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