VerapamilCalcium Channel BlockersDiltiazemP-GlycoproteinDrug ResistanceCalciumNitrendipineNicardipineAnti-Arrhythmia AgentsCinnarizineDaunorubicinQuinidineDrug InteractionsFlunarizineDrug Resistance, MultipleDogsRhodamine 123Dose-Response Relationship, DrugAnesthesia, IntratrachealBepridilCalcium Chloride