System for recording the breathing efforts of a patient

A system for recording breathing efforts of a patient, wherein the system comprises a pressure determination device for determining a pressure at a point in time of a breathing effort of the patient, the pressure determination device being designed as an esophageal catheter with a single gas-filled balloon, the system further comprising a respirator which comprises a pressure inlet nozzle for the esophageal catheter and a pressure sensor, wherein a breathing effort of the patient is recorded via the gas-filled balloon of the esophageal catheter, the system further comprising a unit which is configured to compare a respiratory gas stroke in the form of respiratory pressure or respiratory volume or respiratory flow which is chronologically specified by the respirator with the breathing effort of the patient for determining a synchronicity, and wherein an index of failed triggers is inferred from the comparison, where the index represents a degree of synchronization between the inspiration efforts of the patient and the inspiration specification of the respirator.