7 lines (6 with data), 258 Bytes

m037b 0 128 0 10:40:00 18/01/1991
# Start time=10:40
# First beat=10:40:00.804
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.445,  <RR-high-limit(sec)>: 1.195
# Note: recording with a timing signal, flutter-compensated