2000
In the present case , complete atrioventricular ( AV ) block with syncopal attacks developed secondary to lithium therapy , necessitating permanent pacemaker implantation .
 Disease: atrioventricular ( AV ) block; Disease: syncopal attacks; Chemical: lithium
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:
 Disease: atrioventricular ( AV ) block; Disease: syncopal attacks; Chemical: lithium