The draining lava left long, tube-like caverns. Of the four caves in this particular cluster, only Boyd Cave is now open to hikers. Arnold Ice Cave is filled with ice. Skeleton and Wind Cave were open to hikers until 2007, when they were gated closed to prevent vandalism and protect hibernating bats.
Dyspnea is translated from medical terminology to mean difficult breathing, where some disease, reaction, or other stimulant has caused breathing to be obstructed or otherwiseâ¦ uneasy. Apnea means lack of or stopped breathing.
Dyspnea is usually caused by disorders of the lungs or heart (see Table: Some Causes and Features of Shortness of Breath). Pulmonary embolism (sudden blockage of an artery of the lung, usually by a blood clot) is a less common, but serious cause. However, such people may also develop another disorder.