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S4
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[[File:Airmen perform flight medicine exams 120502-F-YG608-005.jpg|300px|thumb|right]]
'''S4''' is the fourth heart sound, the "ta" of "ta-lub-dub," or the "chich" in "chich-a-ron." An '''S4''' is also known as the Tennessee [[Gallops|gallop]] because of the high density of patients with '''S4''' gallops in this state.<ref>[http://gomerblog.com/2015/12/heart/ Physical Exam Tips: The Heart (Gomerblog)]</ref><ref>[http://gomerblog.com/2016/11/heartbeats-dr-dre/ Product Review: Heartbeats by Dr. Dre Stethoscopes (Gomerblog)]</ref>
'''Additional Topics'''
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'''References'''- [[S3]] - [[S5]] - [[T1]] - [[L1]] - [[F5]]<references />
[[Category:Physical Exam]]
[[Category:Cardiology]]