Table 3.

Right ventricle free wall strain segmental data (values are expressed as mean ± SD)

PEEP (cmH2O)	PEEP 0	PEEP 5	PEEP 10	PEEP 15	PEEP 20	PEEP 25	PEEP 30	Mean difference from PEEP 0 to final PEEP
Basal segment S(%)	−19.2 ± 4	−15.8 ± 3	−12.3 ± 5	−8 ± 5*	−9 ± 1*	−7 ± 4*	−6 ± 4*	14.0 ± 1
Mid segment S(%)	−23.4 ± 4	−19.7 ± 5	−15.1 ± 5	−11.2 ± 4*	−8.6 ± 5*⌘	−9.3 ± 6*	−8.7 ± 5*⌘	15.5 ± 2
Apical segment S(%)	−22 ± 4	−19 ± 4	−12.7 ± 5*	−13.3 ± 3*	−9.3 ± 3*⌘	−7.3 ± 3*⌘	−7 ± 3*⌘	15.2 ± 1
TTP delay (msec)	50 ± 29	78 ± 58	72 ± 28	69 ± 43	113 ± 61	118 ± 133	86 ± 70	71.3 ± 31

S: strain; TTP delay: time to peak strain delay between segmental values. *indicates significant difference (p < 0.002) compared with PEEP 0 cmH₂O. ^⌘indicates significant difference compared with PEEP 5 cmH₂O.