As a quick summary: First, you will have to do well in high school in order to get accepted to a decent college. You will most likely go to college for 4 years and take the necessary pre-med courses, which includes 1 year of biology, 1 year of chemistry, 1 year of organic chemistry, and 1 year of physics.lthough they are not specific to psychiatry (they're about becoming a medical doctor, which is the same pathway to becoming a psychiatrist), check out the following websites: http://www.aamc.org/students/considering/careers.htm and http://www.ama-assn.org/ama/pub/category/2320.html.
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. This occurs in response to exercise, exertion, excitement, pain, fever, excessive thyroid hormone, low blood oxygen (hypoxia), stimulant drugs (such as caffeine), etc.
siÂ·nus arÂ·rhythÂ·miÂ·a. rhythmic, repetitive irregularity of the heartbeat, the heart being under the control of its normal pacemaker, the sinuatrial node. Synonym(s): juvenile arrhythmia. sinus arrhythmia. an irregular cardiac rhythm in which the heart rate usually increases during inspiration and decreases during expiration. It is common in children and young adults and has no clinical significance except in elderly patients.