A patient monitoring system comprising: a sense circuit configured to receive at least two samples, a memory configured to store the at least two samples, a physiologic data analyzer circuit configured to: in a first control loop, determine a first trend using the at least two samples and compare the first trend to a first threshold, and: while the trend is lower than the first threshold, remain in the first control loop and display the first threshold indicating that the first threshold is active, when the first trend exceeds the first threshold, declare a beginning of a patient alert period and transition from the first control loop to a second control loop, in the second control loop, continue to receive samples through the sense circuit after the trend exceeds the first threshold, determine a second trend using the samples detected after the first trend exceeds the first threshold, compare the second trend to a second threshold that is lower than the first threshold, and: while the second trend is above the second threshold, remain in the second control loop and display the second threshold indicating that the second threshold is active, when the second trend falls below the second threshold, declare an end to the patient alert period, and transition from the second control loop to the first control loop. a sense circuit configured to receive at least two samples, a memory configured to store the at least two samples, a physiologic data analyzer circuit configured to: in a first control loop, determine a first trend using the at least two samples and compare the first trend to a first threshold, and: while the trend is lower than the first threshold, remain in the first control loop and display the first threshold indicating that the first threshold is active, when the first trend exceeds the first threshold, declare a beginning of a patient alert period and transition from the first control loop to a second control loop, in the second control loop, continue to receive samples through the sense circuit after the trend exceeds the first threshold, determine a second trend using the samples detected after the first trend exceeds the first threshold, compare the second trend to a second threshold that is lower than the first threshold, and: while the second trend is above the second threshold, remain in the second control loop and display the second threshold indicating that the second threshold is active, when the second trend falls below the second threshold, declare an end to the patient alert period, and transition from the second control loop to the first control loop. in a first control loop, determine a first trend using the at least two samples and compare the first trend to a first threshold, and: while the trend is lower than the first threshold, remain in the first control loop and display the first threshold indicating that the first threshold is active, when the first trend exceeds the first threshold, declare a beginning of a patient alert period and transition from the first control loop to a second control loop, while the trend is lower than the first threshold, remain in the first control loop and display the first threshold indicating that the first threshold is active, when the first trend exceeds the first threshold, declare a beginning of a patient alert period and transition from the first control loop to a second control loop, in the second control loop, continue to receive samples through the sense circuit after the trend exceeds the first threshold, determine a second trend using the samples detected after the first trend exceeds the first threshold, compare the second trend to a second threshold that is lower than the first threshold, and: while the second trend is above the second threshold, remain in the second control loop and display the second threshold indicating that the second threshold is active, when the second trend falls below the second threshold, declare an end to the patient alert period, and transition from the second control loop to the first control loop. determine a second trend using the samples detected after the first trend exceeds the first threshold, compare the second trend to a second threshold that is lower than the first threshold, and: while the second trend is above the second threshold, remain in the second control loop and display the second threshold indicating that the second threshold is active, when the second trend falls below the second threshold, declare an end to the patient alert period, and transition from the second control loop to the first control loop. while the second trend is above the second threshold, remain in the second control loop and display the second threshold indicating that the second threshold is active, when the second trend falls below the second threshold, declare an end to the patient alert period, and transition from the second control loop to the first control loop.