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. 2020 Feb 3;9(3):e014035. doi: 10.1161/JAHA.119.014035

Table 2.

Coronary Hemodynamics at Each Temperature Time Point

Time Point I Time Point II Time Point III P Value Bonferroni Multiple Comparisons
I to II I to III II to III
Rewarming protocol (n=6) Normothermia (38°C) MiHT (34°C) Rewarming (38°C)
At rest
APV, cm/s 27.0±11.5 18.3±6.2 20.8±7.4 0.424
MR, mm Hg/cm per s 4.1±1.3 5.0±1.1 4.7±1.8 0.570
Nitroglycerin
FFR 0.99±0.08 0.97±0.04 0.97±0.02 0.831
bAPV, cm/s 25.3±10.4 18.2±4.8 19.0±5.8 0.363
pAPV, cm/s 53.7±22.2 43.8±11.8 47.3±8.5 0.574
CFR 2.2±0.7 2.6±1.0 2.6±0.4 0.321
MR mm Hg/cm per s 2.0±1.0 1.9±0.6 1.8±0.4 0.879
Bradykinin
FFR 0.94±0.08 0.99±0.03 0.98±0.02 0.512
bAPV, cm/s 19.0±7.7 14.8±5.6 12.3±3.8 0.052
pAPV, cm/s 40.1±17.5 33.5±11.5 37.5±9.4 0.483
CFR 2.2±0.6 2.2±0.5 3.2±0.8 0.125
MR, mm Hg/cm per s 2.4±1.1 2.6±0.9 2.6±1.2 0.757
ATP
FFR 0.94±0.05 0.96±0.02 0.95±0.06 0.646
bAPV, cm/s 14.5±3.8 12.3±4.1 11.8±3.4 0.055
pAPV, cm/s 57.7±5.9 49.7±5.2 53.0±8.6 0.100
CFR 4.2±0.9 4.5±1.2 4.8±0.9 0.112
hMR, mm Hg/cm per s 1.5±0.2 1.7±0.4 1.6±0.4 0.435
MoHT protocol (n=6) Normothermia (38°C) MiHT (34°C) MoHT (32°C)
At rest
APV, cm/s 20.2±11.2 18.7±4.3 11.3±5.3 0.007 >0.999 0.060 0.208
MR, mm Hg/cm per s 4.9±2.2 5.9±2.3 9.6±5.5 0.182
Nitroglycerin
FFR 1.01±0.26 0.95±0.05 0.97±0.03 0.520
bAPV, cm/s 17.5±6.6 19.1±7.3 13.1±6.5 0.096
pAPV, cm/s 32.3±15.6 35.3±12.0 27.7±4.36 0.049 >0.999 >0.999 0.568
CFR 1.8±0.5 1.9±0.5 2.9±1.2 0.203
MR, mm Hg/cm per s 2.8±2.3 2.7±1.1 3.2±0.6 0.418
Bradykinin
FFR 1.05±0.17 0.97±0.34 0.97±0.34 0.650
bAPV, cm/s 16.0±5.5 12.7±1.4 10.0±4.5 0.170
pAPV, cm/s 39.0±20.6 33.5±10.2 39.0±22.7 0.888
CFR 2.4±0.8 2.7±0.8 4.5±2.9 0.138
MR, mm Hg/cm per s 2.3±0.9 2.6±0.6 2.6±1.5 0.760
ATP
FFR 0.97±0.44 0.90±0.09 0.96±0.04 0.205
bAPV, cm/s 14.0±4.9 13.8±4.5 9.0±4.0 0.119
pAPV, cm/s 37.7±17.2 43.2±14.3 32.2±9.9 0.226
CFR 2.6±0.6 3.2±0.3 3.9±1.2 0.181
hMR, mm Hg/cm per s 2.0±0.6 2.0±0.8 3.4±1.6 0.273

APV indicates average peak velocity; bAPV, baseline average peak velocity; CFR, coronary flow reserve; FFR, fractional flow reserve; hMR, hyperemic microvascular resistance; MR, microvascular resistance; MiHT, mild hypothermia; MoHT, moderate hypothermia; pAPV, peak average peak velocity.