7 lines (6 with data), 257 Bytes

m139b 0 128 0 8:32:00 29/05/1990
# Start time=08:32
# First beat=08:40:21.914
# <age-range>: 50-54, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.515,  <RR-high-limit(sec)>: 0.929
# Note: recording with a timing signal, flutter-compensated