Exhibit 4-68. Heart rate greater than specified criteria Stage 2 (19 through 49 years)
Ideally the HR should be below 85 percent PMHR for SPs 19 through 49 years. If the heart rate is greater than 85 percent PMHR for this age group at any time during
Stage 2 determine if the SP is OK and able to continue the exam. If the SP is OK,
continue with the test and monitor closely for the remainder of the exam. If the SP
looks exhausted or does not want to continue, go to Recovery. When the data are captured at the end of Stage 2, the ISIS system will display a
message: ‘Heart rate is greater than 85 percent PMHR. If SP is OK, continue with the
test. If not, go to Recovery.’ Click OK.