CAMK2G and chronic obstructive pulmonary disease: Additionally, KN93 (a Ca2+/calmodulin‐dependent protein kinase II [CaMKII] inhibitor, 1 μM) suppressed the nonsustained or sustained VTs induced by combined 20‐Hz tachypacing and isoproterenol treatment in 5 of 8 COPD RVOTs (p = 0.007) and 7 of 8 nicotine‐treated COPD RVOTs (p < 0.001).