{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T03:59:42Z","timestamp":1787025582582,"version":"build-2736575974"},"reference-count":57,"publisher":"IMR Press","issue":"4","license":[{"start":{"date-parts":[[2021,12,22]],"date-time":"2021-12-22T00:00:00Z","timestamp":1640131200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Rev. Cardiovasc. Med."],"abstract":"<jats:p>Inappropriate sinus tachycardia (IST) has been defined as a resting heart rate of &gt;100 beats per minute and an average 24-hour heart rate &gt;90 bpm with distressing symptoms resulting from the persistent tachycardia. IST is prevalent in 1% of the middle-aged population, mostly females. Rarely can elderly patients also present with IST. Possible mechanisms of IST include intrinsic sinus node abnormality, beta-adrenergic receptor stimulating autoantibody, beta-adrenergic receptor supersensitivity, muscarinic receptor autoantibody, or hyposensitivity, impaired baroreflex control, depressed efferent parasympathetic\/vagal function, nociceptive stimulation, central autonomic overactivity, aberrant neurohumoral modulation, etc. Symptoms associated with IST are palpitations, chest pain, fatigue, shortness of breath, presyncope, and syncope. Despite these distressing symptoms, IST has not been associated with tachycardia-associated cardiomyopathy or increased major cardiovascular events. Various treatment options for patients with IST are ivabradine, beta-adrenergic blockers, calcium channel blockers, psychiatric evaluation, and exercise training. Although, endocardial radiofrequency ablation targeting the sinus node has been used as a treatment modality for otherwise treatment-refractory IST, the results have been dismal. The other modalities used for refractory IST treatment are endocardial modification of the sinus node using radiofrequency energy, combined endo and epicardial ablation of the sinus node, thoracoscopic epicardial ablation of the sinus node, sinus node sparing thoracoscopic and endocardial hybrid ablation. The goal of this review is to provide the readership with the pathophysiological basis of IST and its management options.<\/jats:p>","DOI":"10.31083\/j.rcm2204139","type":"journal-article","created":{"date-parts":[[2021,12,22]],"date-time":"2021-12-22T21:04:36Z","timestamp":1640207076000},"source":"Crossref","is-referenced-by-count":14,"title":["Inappropriate sinus tachycardia: a review"],"prefix":"10.31083","volume":"22","author":[{"given":"Muzaffar","family":"Ali","sequence":"first","affiliation":[{"name":"Department of Cardiology, Khyber Medical Institute Srinagar, 190010 Jammu and Kashmir, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdul Qadir","family":"Haji","sequence":"first","affiliation":[{"name":"Department of Cardiology, Walter Reed Medical Center, Bethesda, MD 20814, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Asim","family":"Kichloo","sequence":"first","affiliation":[{"name":"Department of Internal Medicine, Central Michigan University, Mt Pleasant, MI 48859, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Blair P","family":"Grubb","sequence":"first","affiliation":[{"name":"Division of Cardiology, University of Toledo, Toledo, OH 43606, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khalil","family":"Kanjwal","sequence":"first","affiliation":[{"name":"Section of Electrophysiology, McLaren Greater Lansing Hospital, Lansing, MI 48910, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"16242","published-online":{"date-parts":[[2021,12,22]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","unstructured":"Sheldon RS, Grubb BP, Olshansky B, Shen W, Calkins H, Brignole M, et al. 2015 Heart Rhythm Society Expert Consensus Statement on the Diagnosis and Treatment of Postural Tachycardia Syndrome, Inappropriate Sinus Tachycardia, and Vasovagal Syncope. 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