An algorithm converts this information into systolic and diastolic blood pressure readings.

Source: https://www.gadgets360.com/science/news/smartphone-camera-flash-attachment-monitor-blood-pressure-user-fingertip-4077882

Subsequent analysis revealed cardiac structure, diastolic function, and mitral valve function improvements after 10 weeks of treatment.

Source: https://seekingalpha.com/article/4591775-cytokinetics-temper-expectations-aficamten-crowded-hcm-market?source=feed_all_articles

The diastolic pressure (lower number) is the resistance to the blood flow in the blood vessels.

Source: https://www.dailymail.co.uk/health/article-11639625/10-minute-scan-rid-millions-adults-high-blood-pressure.html?ns_mchannel=rss&ns_campaign=1490&ito=1490