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Non-ejection click

This is a mid systolic click in Mitral / Tricuspid valve prolapse followed by late systolic
murmur. NEC is produced by the stretch on the chordae and papillary muscles by the prolapsed cusp of the mitral/tricuspid valve.
Multiple sounds are heard in Ebstein's anomaly - split S„ split S2, OS and S4
Mid Systolic Clicks
Clicks in midsystole are heard in
  • Mitral valve prolapse syndrome
  • Tricuspid valve prolapse syndrome
  • Aneurysm of interatrial or interventricular septum
  • Ebstein's anomaly
  • Severe aortic regurgitation.