Also, this might be interesting:
“Tachycardia is a common side effect of clozapine treatment that occurs in about 25% of users, especially during dose titration in early treatment. However, it is also a key symptom of myocardial disease. It is therefore essential that patients who have persistent tachycardia at rest, especially in the first two months of treatment, are closely observed for other signs and symptoms of myocarditis/cardiomyopathy. These include palpitations, arrhythmias, symptoms mimicking myocardial infarction, chest pain and other unexplained symptoms of heart failure.”
Tachycardia is increased resting heart rate. Which Wikipedia says is over 100 bpm.