Fig. 4From: Factors affecting intraosseous pressure measurementCardiac and respiratory waves. A representative IOP recording at different speeds. On the left (12.5 mm/sec, eight pulses in 6 s, pulse rate 80/min), a wave which was seen to be synchronous with the arterial pulse is observed. On the right (at a speed 60 times slower (12.5 mm/min), for 3 min, eight respirations per minute), an underlying wave which was seen to be synchronous with respiration was observed. Large squares are 0.5 cmBack to article page