Background: Electroconvulsive therapy (ECT) is considered as a painless and effective treatment for mania, catatonia, suicidality, and psychosis. The nurses' duties in the ECT treatment are to assist the patient undergoing the treatment, giving information about the treatment process and address any fears that the patient or family members may have. The National ECT Quality Register aims to improve thequality and increase the treatment availability in Sweden. Patient-centered variables as defined by the Swedish Society of Nursing, is "data that includes nursing care in the structure, process, and/or performance levels." Currently there are no patientcentered variables in the ECT Quality Register. Aim: Defining the nurses' opinions about patient-centered variables, which can improve the quality of care in the ECT treatment. Method: A quantitative online survey that was constructed based on the results of qualitative interviews with ECT nurses. Results: The patient-centered variables that most participants in the study suggested to be included in the Quality ECT register, are the variables that highlight the efforts for the patient regarding the observation and prevention of side-effects, written andoral information regarding ECT treatment, any expected effects and side effects,follow-up after discharge, their experience of the treatment, pre-medication,information on early signs of relapse, support during and after the ECT treatment, participation in the planning of ECT treatment, continuity of the care process and assistance with anxieties before and after the ECT treatment.Conclusion: The study shows that the patient-centered variables are requested to be included in ECT Quality Register.