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 Echo is a round black cylinder with an audio system inside. It is always connected to the cloud via wi-fi giving it a vast online resource to tap. The Echo interacts with you by voice, and answers to the name Alexa. If you don't like the name you can call it Amazon, but talking to Amazon in your home is creepy. Amazon Echo: Ringmaster of the home automation IoT circus.