Rapid, regular heartbeats originating atria.

Rapid, regular atrial contractions pattern.

Rapid, abnormal ventricular heart rhythm.

Leg movement in swimming, continuous.

Rapid, irregular atrial heart contractions.

One-way valve for breathing.

an opsoclonic disorder that results in horizontal saccades.

Rapid tongue movement produces vibration.

Rapid involuntary diaphragm contraction spasms.