Figure 2From: Prolonged post-hyperventilation apnea in two young adults with hyperventilation syndromeClinical course of apnea and HV attacks about one month after admission: Patient 2. The patient presented a 3-minute episode of apnea after an HV attack with a minimum SpO2 of 66% and cyanosis of the lips. The patient did not show hypoxemia during the hyperventilation attack or during normal respiration. HV: hyperventilation, I.m.: intramuscular injection.Back to article page