The experimental treatment was a refrigerated oil blend of lavender (Lavandula officinalis), roman chamomile (Chamomile roman), and neroli (Citrus aurantium) at a ratio of 6 : 2 : 0.5 as prescribed by an aromatherapist. Lavender suppresses heart stimulation and lowers blood pressure; therefore, it is useful in the treatment of heart acceleration and high blood pressure. Chamomile has a calming effect and is effective in relieving anxiety and stress, and neroli has a calming effect and is effective in treating insomnia [9]. The method of application was the inhalation of essential oil that was dropped on aroma stones. In the aromatherapy group, two drops of the blend of lavender, roman chamomile, and neroli oils at a ratio of 6 : 2 : 0.5 were inhaled, through 10 deep breaths, before and after PCI, and the aroma stone was placed under the patient's pillow until the following morning. The control group received conventional nursing care.