Abnormal levels of amino acids have been reported in patients with schizophrenia and have also been investigated as a biomarker to monitor antipsychotic treatment, however results have been inconsistent. The purpose of the present review is to summarize the evidence in the literature of whether amino acid levels can be a biomarker and predict the treatment outcome in schizophrenia. The current review does not support amino acid concentration as a useful biomarker for monitoring antipsychotic response in patients with schizophrenia, although there is evidence that high levels of serum homocysteine and glutamate might be considered as a trait marker for schizophrenia. This review has also highlighted a considerable dearth of studies, specifically of studies evaluating antipsychotic side-effects.
Amino Acids ; Antipsychotic Agents ; Glutamic Acid ; Homocysteine ; Humans ; Schizophrenia* ; Treatment Outcome

Objective: To evaluate the impact of healthcare reorganization during the severe acute respiratory syndrome coronavirus 2 pandemic on Italian colposcopy clinic activities, focusing on cervical excision procedures, follow-ups for conservative management of low-grade lesions, and follow-ups post cervical excision. Methods: Retrospective study conducted in 14 Italian colposcopy clinics. The number and clinical characteristics of cervical excisions, follow-ups for conservative management of low-grade lesions, and follow-ups after cervical excision were compared between the period March 1, 2019 to February 29, 2020 (pre-pandemic) and March 1, 2020 to February 28, 2021 (pandemic) with a Poisson regression analysis. Results: In the pandemic period, the number of cervical excisions was reduced by 8.8% (95% confidence interval [CI]=−15.6% to −2%; p=0.011). Excisions were less frequently performed in the operating room (−35.1%; 95% CI=−47.6% to −22.6%; p<0.001), the number of patients from spontaneous screening was reduced by −14.0% (95% CI=−23.4% to −4.6%; p=0.003), and the CO2-laser technique was used less frequently (−30%; 95% CI=−45.1% to −15.0%; p<0.001). As compared to the pre-pandemic period, the number of follow-ups for conservative management of low-grade lesions was reduced by −26.7% (95% CI=−39.0% to −14.4%; p<0.001), and the follow-up appointments after cervical excision were reduced by −51.0% (95% CI=−58.1% to −43.9%; p<0.001). Conclusion The most significant impact of the healthcare reorganization during the coronavirus disease 2019 pandemic was on follow-ups after cervical excision. The resumption of disrupted activities should follow a risk-based prioritization, starting from women in follow-up after cervical excision. It is advisable that the trend of performing cervical excision as an outpatient procedure is maintained in the post-pandemic period.