7 lines (6 with data), 251 Bytes

e164a 0 128 0 8:53:00 03/04/1988
# Start time=08:53
# First beat=08:59:17.250
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.445,  <RR-high-limit(sec)>: 1.357
# Note: recording with a timing signal, flutter-compensated