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. 2021 Jul 27;12:642299. doi: 10.3389/fphys.2021.642299

FIGURE 5.

FIGURE 5

Correlation of RRi with incidence of negative P waves during AITC and vehicle inhalation. Each cardiac cycle from WKY rats (A, n = 9 animals, 8220 cycles during vehicle, 4224 cycles during AITC), SH rats (B, n = 12 animals, 11,745 cycles during vehicle, 9558 cycles during AITC), WKY rats pretreated with 1 mg/kg atropine (C, 6 animals, 6771 cycles during vehicle, 6363 cycles during AITC), SH rats pretreated with 1 mg/kg atropine (D, 9 animals, 10,104 cycles during vehicle, 11,511 cycles during AITC), and SH rats pretreated with 0.5 mg/kg atenolol (E, n = 4 animals, 3185 cycles during vehicle, 2601 cycles during AITC) was grouped by RRi into 25 ms bins. For each RRi bin during vehicle (blue) and AITC (red) inhalation the number of cardiac cycles recorded (top), the number of cycles with negative P waves (middle) and the probability of a given cycle having a negative P Wave (bottom) is shown.