7 lines (6 with data), 251 Bytes

m134a 0 128 0 14:30:00 13/01/1990
# Start time=14:30
# First beat=14:31:44.109
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.554,  <RR-high-limit(sec)>: 1.25
# Note: recording with a timing signal, flutter-compensated