Sinus bradycardia: definitions, ECG, causes and management
Sinus bradycardia: ECG, causes & management Definition of sinus bradycardia Sinus bradycardia fulfills the criteria for sinus rhythm but the heart rate is slower than 50 beats per minute. ECG criteria follows: Regular rhythm with ventricular rate slower than 50 beats per minute. P-waves with constant morphology preceding every QRS complex. P-wave is positiv in limb lead II. Normal (physiological) causes of sinus bradycardia Sinus bradycardia (SB) is considered a normal finding in the following circumstances: During sleep . Well-trained individuals display SB at rest due to high vagal tone. These individuals have developed a highly efficient left ventricle, capable of generating sufficient cardiac output at low heart rates. During vasovagal syncope (e.g during intense emotional stress) During vagal maneuvers (Valsalva maneuver, carotid sinus [baroreceptor] stimulation). Its not uncommon to discover SB in healthy young individuals who are not well-trained. This is also a normal finding. Abnormal …
About the author
Cuộc đời thì ngắn, mà nghề thì miên man;cơn bệnh phập phù;kinh nghiệm hiểm nguy, còn quyết định thì thật khó.Người thầy thuốc không phải chỉ chuẩn bị để tự mình làm đúng, mà còn khiến cho bệnh nhân, người đi theo và các yếu tố xung quanh hợp tác hài…