Heart click explained

Differential:	mitral stenosis, mitral valve prolapse

With newer, non-invasive imaging techniques, the origin of other, so-called adventitial sounds or heart clicks has been appreciated. These are short, high-pitched sounds.

• The mitral valve in cases of mitral stenosis may open with an opening snap^{[1] [2]} on the beginning of diastole.
• Patients with mitral valve prolapse may have a mid-systolic click along with a murmur, referred to as apical late systolic murmur.^[3] Early systolic clicks may also be present in some patients.^[4]
• Aortic and pulmonary stenosis may cause an ejection click^[5] immediately after S₁.

Notes and References

1. MOUNSEY P . The opening snap of mitral stenosis . Br Heart J . 15 . 2 . 135–42 . April 1953 . 13041992 . 479479 . 10.1136/hrt.15.2.135.
2. Web site: The Auscultation Assistant - Mitral Stenosis . 2019-12-13.
3. Rizzon P, Biasco G, Brindicci G, Mauro F . Familial syndrome of midsystolic click and late systolic murmur . Br Heart J . 35 . 3 . 245–59 . March 1973 . 4692656 . 458599 . 10.1136/hrt.35.3.245.
4. Early Systolic Clicks due to Mitral Valve Prolapse. Hutter A, Dinsmore R, Willerson J, DeSanctis R . Circulation. 44. 4. 516–22. October 1971. 10.1161/01.CIR.44.4.516. 16560573. 373684.
5. Web site: Techniques - Heart Sounds & Murmurs Exam - Physical Diagnosis Skills - University of Washington School of Medicine . 2009-03-06.