Dyspnea was reported in seven studies 18, 25, 27, 54, 66, 68, 85. A single study reported eight patients with transient shock after stem cell transfusion 51. Some of these patients developed loss of consciousness and cyanosis but recovered promptly and had no need for additional therapy, whereas the rest of the patients developed severe hypotension or transient dyspnea, which was described as the reason for the transient shock. Further description of the condition was not provided.