The link(s) below go to OES data maps for employment and wages by state and area. 1  Brickmasons and blockmasons. 2  Cement masons and concrete finishers. 3  Segmental pavers. 4  Stonemasons. 5  Terrazzo workers and finishers.
Sinus arrhythmia refers to the normal increase in heart rate that occurs during inspiration (when you breathe in). This is a normal response and is more accentuated in children than adults. Sinus tachycardia refers to a fast heartbeat (tachycardia) because of rapid firing of the sinoatrial (sinus) node.
Inappropriate sinus tachycardia (IST) is a condition in which a person's heart rate, at rest and during exertion, is abnormally elevated for no apparent reason. People with IST often have resting heart rates greater than 100 beats per minute, and with even minimal exertion the heart rate often rises to very high levels.