What's too low when it comes to diastolic BP?

Patients with low diastolic blood pressure and a high pulse pressure may be at increased risk of coronary heart disease (CHD), a large observational study shows.

The US research reports that a low diastolic BP of between 60 and 69mmHg raises the risk of CHD by 23%, compared with a diastolic BP of between 80 and 89mmHg.

This association was strongest in those people with a systolic BP 120mmHg or more, say the authors from the Johns Hopkins