7 lines (6 with data), 258 Bytes

m294b 0 128 0 10:12:00 07/04/1990
# Start time=10:12
# First beat=10:12:00.273
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.632,  <RR-high-limit(sec)>: 1.039
# Note: recording with a timing signal, flutter-compensated