7 lines (6 with data), 252 Bytes

m287b 0 128 0 15:30:00 16/11/1990
# Start time=15:30
# First beat=15:40:12.617
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: NA,  <RR-high-limit(sec)>: NA
# Note: recording with a timing signal, flutter-compensated