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.
Amazon's cheaper Echo Dot improves voice recognition, available in black and white. Amazon launched its Echo Dot device earlier this year, but it has been sold out in recent months. While the original Echo Dot was priced at $89.99, Amazon is unveiling an all-new, second-generation Dot today that's priced at just $49.99. Just like the previous Dot, you can use the tiny puck-like device to add the Alexa voice assistant to existing speakers.