Aortic insufficiency causes both volume overload (elevated preload) and pressure overload (elevated afterload due to increased stroke volume) of the heart. The volume overload (due to elevated pulse pressure and the systemic effects of neuroendocrine hormones) causes left ventricular hypertrophy (LVH).
Echo Dot is a hands-free, voice-controlled device that uses the same far-field voice recognition as Amazon Echo. Dot has a small built-in speakerâit can also connect to your speakers over Bluetooth or with the included audio cable.
The Amazon Dot Is More Than a Small Echo. A few weeks ago Amazon excited the tech press by announcing two new devices that are a cross between Apple's Siri voice-controlled assistant and an Internet-connected speaker. Both will join the Amazon Echo in working with its Alexa Voice Service, the brains behind Amazon's speech recognition.