![]() ![]() This type of bradycardia is due to diminished automaticity (pacemaker function) in the sinoatrial node or conduction defects (e.g second-degree AV block) as a result of ischemia/infarction. Myocardial ischemia/infarction – Particularly ischemia or infarction located to the inferior wall of the left ventricle.The most important causes are as follows: There are numerous pathological conditions that cause sinus bradycardia. In all other situations, sinus bradycardia should be regarded as a pathological finding. This is also a normal finding.Ībnormal (pathological) causes of sinus bradycardia Its not uncommon to discover SB in healthy young individuals who are not well-trained.During vagal maneuvers (Valsalva maneuver, carotid sinus stimulation).During vasovagal syncope (e.g during intense emotional stress).These individuals have developed a highly efficient left ventricle, capable of generating sufficient cardiac output at low heart rates. Well-trained individuals display SB at rest due to high vagal tone.Sinus bradycardia (SB) is considered a normal finding in the following circumstances: Normal (physiological) causes of sinus bradycardia P-waves with constant morphology preceding every QRS complex.Regular rhythm with ventricular rate slower than 50 beats per minute.Sinus bradycardia fulfills the criteria for sinus rhythm but the heart rate is slower than 50 beats per minute. Sinus bradycardia: ECG, causes & management Definition of sinus bradycardia ![]()
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