“…Among these are different variables that relate the magnitude of ST‐segment depression to heart rate during or after the exercise, the ST/HR slope and the rate–recovery loop (Elamin et al ., 1980; Okin et al ., 1989; Kligfield et al ., 1989, 1993; Okin & Kligfield, 1989; Herpin et al ., 1996; Lehtinen et al ., 1996; Gullestad et al ., 2000). These test variables have been shown to improve the diagnostic accuracy of the exercise ECG test (Okin et al ., 1988; Schiariti et al ., 1991; Kligfield et al ., 1993; Goldberg et al ., 1995; Herpin et al ., 1996; Lehtinen et al ., 1996). They have also been shown to improve the prediction of future coronary events in large population studies (Okin et al ., 1991, 1996).…”