Tidal Breathing (Cheyne-Stokes) is an abnormal pattern of breathing which occurs in patients with congestive heart failure, neurological diseases, and central sleep apnea. The breathing pattern is increased and decreased gradually like tidal volume with periods of sleep apnea. Cheyne-stokes respiration is caused by the failure of the respiratory center in the brain to compensate quickly for changing serum partial pressure of carbon dioxide and oxygen. This abnormal breathing pattern can be seen in patients with head injuries, strokes, and brain tumors. Sometimes, it can occur in normal people during sleep at high altitudes. In TCM, tidal breathing (Cheyne-Stokes) is caused by the deficiency of kidney energy, which cannot supply enough Qi for the lungs.