7 lines (6 with data), 257 Bytes

m126b 0 128 0 8:46:00 05/02/1990
# Start time=08:46
# First beat=08:51:32.523
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.492,  <RR-high-limit(sec)>: 1.289
# Note: recording with a timing signal, flutter-compensated