Grade I lesions demonstrate antegrade flow with a diminished peak systolic velocity. Grade II lesions show retrograde flow during systole and antegrade flow during diastole.

Letters & Politics seeks to explore the history behind today's major global and national news stories.

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Skip More from 5 Live... What Elis James and John Robins got up to in 2024 It’s time to recap on some of Elis James and John Robins' best moments of 2024. Six things we didn't know about being a ...

Researchers are starting to give low diastolic blood pressure more attention. We'll tell you why and how it affects your health.

Heart rate sensors available for DIY use employ photoplethysmography which illuminates the skin and measures changes in light absorption. These sensors are cheap, however, the circuitry required to… ...

The Intra-aortic Balloon Pump in High-risk Percutaneous Coronary Intervention Is Counterpulsation Counterproductive?