A system (10, 100) for performing simultaneous ventilation and resuscitation of a patient comprising: an oxygen source (14, 102) that includes a tank (42, 122) of pressurized gas, the pressurized gas including oxygen; at least one inspiration control valve (104, 364) disposed between the oxygen source (14, 102) and the patient; a laryngeal mask airway disposed downstream from the inspiration control valve (104, 364), the laryngeal mask airway configured to form an air seal with at least a portion of the patient's respiratory tract such that the oxygen can flow from the tank (42, 122) to the lungs; at least one expiration control valve (108, 366) configured to selectively actuate a one-way exhalation valve (64, 166), the inspiration control valve (104, 364) and the expiration control valve being configured to allow the oxygen to flow from the tank (42, 122) to the laryngeal mask airway in a first state and to allow gas expelled from the patient to flow from the laryngeal mask airway to the atmosphere while preventing the oxygen from flowing from the tank (42, 122) in a second state opposite the first state, wherein the first state is ON or an inspiration state and the second state is OFF or an expiration state; at least one indicator (344, 346) configured to indicate when chest compressions on the patient should be performed, the indicator (344, 346) indicating at a rate of at least 100 indications per minute; and at least one timer for synchronizing actuation of the at least one inspiration control valve, the at least one expiration control valve, and the indicator (344, 346), thereby being configured to enable continuous chest compressions to the patient while the patient undergoes both inspiration and expiration, such that the inspiration control valve (104, 364) and the expiration control valve are actuated simultaneously with the actuation of the indicator (344, 346) to provide positive-pressure ventilation automatically to the patient during a downward compression phase of a chest compression on the patient, characterized in that the positive-pressure ventilation results in a peak inspiratory pressure that does not exceed 26 cm H 2 0 relative to atmospheric pressure during the first state for a duration of approximately 400 milliseconds per downward compression phase, the inspiration control valve (104, 364) and the expiration control valve are actuated together at a rate less than 15 times per minute, wherein the system (10, 100) is lightweight, compact, portable, and has a weight, excluding the oxygen source (14, 102), that does not exceed about 810.8 grams. an oxygen source (14, 102) that includes a tank (42, 122) of pressurized gas, the pressurized gas including oxygen; at least one inspiration control valve (104, 364) disposed between the oxygen source (14, 102) and the patient; a laryngeal mask airway disposed downstream from the inspiration control valve (104, 364), the laryngeal mask airway configured to form an air seal with at least a portion of the patient's respiratory tract such that the oxygen can flow from the tank (42, 122) to the lungs; at least one expiration control valve (108, 366) configured to selectively actuate a one-way exhalation valve (64, 166), the inspiration control valve (104, 364) and the expiration control valve being configured to allow the oxygen to flow from the tank (42, 122) to the laryngeal mask airway in a first state and to allow gas expelled from the patient to flow from the laryngeal mask airway to the atmosphere while preventing the oxygen from flowing from the tank (42, 122) in a second state opposite the first state, wherein the first state is ON or an inspiration state and the second state is OFF or an expiration state; at least one indicator (344, 346) configured to indicate when chest compressions on the patient should be performed, the indicator (344, 346) indicating at a rate of at least 100 indications per minute; and at least one timer for synchronizing actuation of the at least one inspiration control valve, the at least one expiration control valve, and the indicator (344, 346), thereby being configured to enable continuous chest compressions to the patient while the patient undergoes both inspiration and expiration, such that the inspiration control valve (104, 364) and the expiration control valve are actuated simultaneously with the actuation of the indicator (344, 346) to provide positive-pressure ventilation automatically to the patient during a downward compression phase of a chest compression on the patient, characterized in that the positive-pressure ventilation results in a peak inspiratory pressure that does not exceed 26 cm H 2 0 relative to atmospheric pressure during the first state for a duration of approximately 400 milliseconds per downward compression phase, the inspiration control valve (104, 364) and the expiration control valve are actuated together at a rate less than 15 times per minute,