7 lines (6 with data), 254 Bytes

m176a 0 128 0 14:57:00 22/05/1991
# Start time=14:57
# First beat=15:04:34.101
# <age-range>: 60-64, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.507,  <RR-high-limit(sec)>: 0.843
# Note: recording with a timing signal, flutter-compensated