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Sinus node dysfunction (SND), also known as sick sinus syndrome (SSS), is a group of abnormal heart rhythms (arrhythmias) usually caused by a malfunction of the sinus node, the heart's primary pacemaker. [1] [2] Tachycardia-bradycardia syndrome is a variant of sick sinus syndrome in which the arrhythmia alternates between fast and slow heart ...
Takotsubo syndrome represents about 2% of all patients (and 5–6% of all female patients) who are initially diagnosed with acute coronary syndrome (ACS). [6] [69] It accounts for 0.02% of all hospitalizations in the US. [6] About 90% of TTS patients are women, [6] [69] whose mean age is about 68 years, and 80% of whom are older than 50 years. [6]
Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate. [1] In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. [1]
Sinus tachycardia is a sinus rhythm of the heart, with an increased rate of electrical discharge from the sinoatrial node, resulting in a tachycardia, a heart rate that is higher than the upper limit of normal (90-100 beats per minute for adult humans).
Bradycardia, also called bradyarrhythmia, is a resting heart rate under 60 beats per minute (BPM). [1] While bradycardia can result from various pathologic processes, it is commonly a physiologic response to cardiovascular conditioning or due to asymptomatic type 1 atrioventricular block.
The leading cause of hypothyroidism is Hashimoto’s disease (also known as Hashimoto’s thyroiditis, chronic autoimmune thyroiditis or lymphocytic thyroiditis), per Cleveland Clinic.
Postural orthostatic tachycardia syndrome (POTS) is a condition characterized by an abnormally large increase in heart rate upon sitting up or standing. [1] POTS is a disorder of the autonomic nervous system that can lead to a variety of symptoms, [10] including lightheadedness, brain fog, blurred vision, weakness, fatigue, headaches, heart palpitations, exercise intolerance, nausea ...
A 2019 study found that participants who were consistent with what time of day they exercised reported that they worked more frequently and for longer durations, so they were more likely to ...