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.
Vasovagal Syncope. VVS is a neurally mediated reflex in which there is a relatively sudden change in autonomic nervous system activity leading to a fall in BP, HR and cerebral perfusion.29 In young patients a diagnosis can usually be made from history alone. This is not always the case with older patients.