7 lines (6 with data), 258 Bytes

m137b 0 128 0 12:16:00 03/10/1990
# Start time=12:16
# First beat=12:21:50.968
# <age-range>: 35-39, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.484,  <RR-high-limit(sec)>: 1.093
# Note: recording with a timing signal, flutter-compensated