diff --git a/HealthMonitor.WebApi/Worker.cs b/HealthMonitor.WebApi/Worker.cs
index f78dcb7..446ac9b 100644
--- a/HealthMonitor.WebApi/Worker.cs
+++ b/HealthMonitor.WebApi/Worker.cs
@@ -265,7 +265,7 @@ namespace HealthMonitor.WebApi
                                 // health_monitor/schedule_push/cal_fetal_heart_rate/imei/
                                 else if (key.Contains("health_monitor/schedule_push/cal_fetal_heart_rate/imei/"))
                                 {
-                                    var triggerValue= (JObject)JsonConvert.DeserializeObject(e.Kv.Value.ToStringUtf8())!;
+                                    var triggerValue= (JObject)JsonConvert.DeserializeObject(e.PrevKv.Value.ToStringUtf8())!;
                                     var trigger = triggerValue["trigger"]?.ToString();
                                     if (!string.IsNullOrEmpty(trigger))
                                     {