7 lines (6 with data), 252 Bytes

m038a 0 128 0 10:13:00 26/11/1990
# Start time=10:13
# First beat=10:17:29.328
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.539,  <RR-high-limit(sec)>: 1.218
# Note: recording with a timing signal, flutter-compensated