There are three main types of volcano-composite or strato, shield and dome. Composite Volcanoes. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava.
A vagal episode or vasovagal response or vasovagal attack (also called neurocardiogenic syncope) is a malaise mediated by the vagus nerve. When it leads to fainting, also known as a syncope, it is called a vasovagal syncope, which is the most common type of fainting.
Vagal maneuvers are used to try to slow an episode of fast heart rate. These simple maneuvers stimulate the vagus nerve, sometimes resulting in slowed conduction of electrical impulses through the atrioventricular (AV) node of the heart. Be sure to talk to your doctor before trying these. Vagal maneuvers that you can try to slow your fast heart rate include: Gagging. Holding your breath and bearing down (Valsalva maneuver). Immersing your face in ice-cold water (diving reflex).