7 lines (6 with data), 251 Bytes

m028a 0 128 0 15:50:00 27/02/1991
# Start time=15:50
# First beat=16:02:21.523
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.562,  <RR-high-limit(sec)>: 0.96
# Note: recording with a timing signal, flutter-compensated