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. Author manuscript; available in PMC: 2013 Jun 19.
Published in final edited form as: Resuscitation. 2011 Apr 8;82(8):1019–1024. doi: 10.1016/j.resuscitation.2011.02.032

Table 2.

CPR performance parameters during cardiac arrest episodes

Initial five minutes of arrest episode (n=108) Entire cardiac arrest episode (n=108)
Chest compression data
 Compression Rate /min
  Mean (SD) 107 (10) 106 (7)
  Cases with rate<80 (%) 0 0
  Cases with rate<90 (%) 4 3
  Cases with rate>110 (%) 35 29
 Compression depth, mm
  Mean (SD) 48.7 (9.9) 48.8 (9.0)
  Cases w depth<38 mm (%) 13 8
 Leaning percentage
  Mean (SD) 11 (14) 10 (10)
Compression Interruption
 No-flow fraction, mean (SD) 0.3 (0.3) 0.2 (0.2)
 Time with no-flow fraction >0.20 (%) 41 37

No-flow fraction is defined as the cumulative no-flow time (time without pulse or chest compressions) during a given resuscitation event, divided by the total time without a pulse during that same event. SD, standard deviation.