4115
This effect , which results in a flattening of the phase 0 and phase 4 slope , together with a longer AP duration , may be due to an increase in the time constants of slow inward ionic currents ( already demonstrated elsewhere ) , but also to an increased time constant for deactivation of the outward potassium current ( Ip ) .
 Chemical: potassium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: potassium