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Figure 2 Coronary artery patency ratio (CAPR) (fraction of an observation period during which the coronary flow was >25% of immediate post-constriction flow) during the treatment period in dogs ventilated without (black bars) or with 20 ppm nitric oxide (NO) (white bars). The dogs were treated with intravenous zaprinast or dipyridamole or did not receive a phosphodiesterase (PDE) inhibitor (without a PDE inhibitor) (n = 4 dogs in each group). *p < 0.05 versus breathing 20 ppm NO without a PDE inhibitor.  p < 0.05 versus treatment with a PDE inhibitor without breathing NO.
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