A comprehensive meta-analysis and systematic review of breath analysis in detection of COVID-19 through Volatile organic compounds

BACKGROUND

The COVID-19 pandemic had profound global impacts on daily lives, economic stability, and healthcare systems. Diagnosis of COVID-19 infection via RT-PCR was crucial in reducing spread of disease and informing treatment management. While RT-PCR is a key diagnostic test, there is room for improvement in the development of diagnostic criteria. Identification of volatile organic compounds (VOCs) in exhaled breath provides a fast, reliable, and economically favorable alternative for disease detection.

METHODS

This meta-analysis analyzed the diagnostic performance of VOC-based breath analysis in detection of COVID-19 infection. A systematic review of twenty-nine papers using the grading criteria from Newcastle-Ottawa Scale (NOS) and PRISMA guidelines was conducted.

RESULTS

The cumulative results showed a sensitivity of 0.92 (95 % CI, 90 %-95 %) and a specificity of 0.90 (95 % CI 87 %-93 %). Subgroup analysis by variant demonstrated strong sensitivity to the original strain compared to the Omicron and Delta variant in detection of SARS-CoV-2 infection. An additional subgroup analysis of detection methods showed eNose technology had the highest sensitivity when compared to GC-MS, GC-IMS, and high sensitivity-MS.

CONCLUSION

Overall, these results support the use of breath analysis as a new detection method of COVID-19 infection.

A feasibility study on exhaled breath analysis using UV spectroscopy to detect COVID-19

A 23-subject feasibility study is reported to assess how UV absorbance measurements on exhaled breath samples collected from silicon microreactors can be used to detect COVID-19. The silicon microreactor technology chemoselectively preconcentrates exhaled carbonyl volatile organic compounds and subsequent methanol elution provides samples for analysis. The underlying scientific rationale that viral infection will induce an increase in exhaled carbonyls appears to be supported by the results of the feasibility study. The data indicate statistically significant differences in measured UV absorbance values between healthy and symptomatic COVID-19 positive subjects in the wavelength range from 235 nm to 305 nm. Factors such as subject age were noted as potential confounding variables.

Surgical treatment of anterior diaphragmatic hernia

Of ten patients with anterior diaphragmatic hernia treated by operation, only three had shortness of breath and chest pain. The remainder of the patients were referred to us because of a roentgenographic abnormality. All patients have had follow-up of between six months and 11 years without recurrence. Surgical repair is recommended to prevent incarceration and strangulation.

Middle lobe syndrome: diagnosis and management

Ninety-eight patients with middle lobe syndrome were reviewed. There were 31 male and 67 female patients ranging in age from 4 to 80 years. The most common presenting symptoms were cough, dyspnea, fever, hemoptysis, and chest pain. Diagnostic studies included chest roentgenogram, bronchoscopy, and bronchography. Sixty-five patients had full recovery following intensive medical therapy. Thirty-one patients underwent surgical resection for persistent disease. There were five post-operative complications and 1 death in this series.

Histoplasmosis: clinical manifestations and surgical management

In this retrospective study of 115 cases of histoplasmids, there were 66 male and 49 female patients ranging in age from 2 months to 79 years. The most common presenting symptoms were cough, chest pain, wheezing, weight loss, hemoptysis, and shortness of breath. Thirty-five patients (30%) were asymptomatic. Two patients had manifestations of obstruction of the superior vena cava. Radiologic findings simulated carcinoma, tuberculosis, pneumonia, and viral infections. Sixty-five patients had various operative proceudres, such as lung biopsy, wedge resection, lobectomy, pneumonectomy, resection of lymph node, and bypass of superior vena cava, for diagnosis and treatment. There were two deaths and two postoperative complications. A total of 15 patients received intravenous amphotericin B. Four patients with pneumonic infiltrates developed disseminated histoplasmosis.