Covid-19 Pneumonia with Acute Pulmonary Embolism in a Morbidly Obese Patient; At Home Dramatic Reversal Management

Rationale: A novel COVID-19 with the severe acute respiratory syndrome had arisen in Wuhan, China in December 2019 Thromboembolism is a critical clinical entity commonly recognized sequel in COVID-19 patients. Interestingly, the presentation of COVID-19 infection with thromboembolism has a risk impact on both morbidity and mortality in COVID-19 patients. Morbid obesity may add over significant risk value in the presence of COVID-19 pneumonia with thromboembolism. Patient concerns: Middle-aged housewife female COVID-19 morbid obese patient presented to physician outpatient clinic with unilateral pneumonia suspected acute pulmonary embolism. Diagnosis: COVID-19 pneumonia with acute pulmonary embolism in morbid obesity. Interventions: CT pulmonary angiography, non- contrasted chest CT scan, electrocardiography, and oxygenation. Outcomes: Dramatic of both clinical and radiological improvement had happened. Lessons: The combination of morbid obesity, QTc prolongation with COVID-19 infection is an indicator of the over-risk of thromboembolism. It signifies the role of anticoagulants, antiplatelet, anti-infective drugs, and steroids in COVID-19 patients with unilateral pneumonia and acute pulmonary embolism in morbid obesity are effective therapies. An increasing the dose of both low-molecular heparin and oral anticoagulant with a morbidly obese patient was reasonable.

D-dimer level has higher correlation with pulmonary embolism diagnosis than a clinical prediction score

Aim This study aimed to compare the predictive value of D-dimer and a clinical prediction score in diagnosis of pulmonary embolism (PE) as this could improve practice and reduce costs simultaneously. Method To achieve this, medical records of patients who presented to the Emergency Department of a large Australian metropolitan general hospital over 12 months and underwent DD testing were reviewed. The correlation coefficient (CC) was calculated using the Cramer’s V method. Results CC between low-, intermediate- and high-risk groups on their own and a final diagnosis of PE on imaging was 0.1332, 0.1278 and 0.0817, respectively. By contrast, the CC when using positive DD was higher for all categories: 0.7527, 0.6256 and 0.4195, respectively. For the age-adjusted DD, the correlations were higher than for the clinical prediction score but less than for the absolute DD; calculated at 0.6490, 0.4987 and 0.3550 for the respective groups. The overall CC for risk category was 0.1107; for a positive DD, it was 0.7033; for the age-adjusted DD, it was 0.5928. Conclusion Positive DD has a higher correlation with PE diagnosis than the clinical prediction score. DD assay, whether positive or negative, is therefore an invaluable test in assessment of patients with suspected PE and can help determine the need for tomographic imaging. The absolute DD is more useful than the age-adjusted value.

Gallium-68 Ventilation/Perfusion PET-CT and CT Pulmonary Angiography for Pulmonary Embolism Diagnosis: An Interobserver Agreement Study

Objectives:68Ga Ventilation/Perfusion V/Q PET-CT is a promising imaging tool for pulmonary embolism diagnosis. However, no study has verified whether the interpretation is reproducible between different observers. The aim of this study was to assess the interobserver agreement in the interpretation of V/Q PET-CT for the diagnosis of acute PE, and to compare it to the interobserver agreement of CTPA interpretation.Methods: Twenty-four cancer patients with suspected acute PE underwent V/Q PET-CT and CTPA within 24 h as part of a prospective pilot study evaluating V/Q PET-CT for the management of patients with suspected PE. V/Q PET-CT and CTPA scans were reassessed independently by four nuclear medicine physicians and four radiologists, respectively. Physicians had different levels of expertise in reading V/Q scintigraphy and CTPA. Interpretation was blinded to the initial interpretation and any clinical information or imaging test result. For each modality, results were reported on a binary fashion. V/Q PET/CT scans were read as positive if there was at least one segmental or two subsegmental mismatched perfusion defects. CTPA scans were interpreted as positive if there was a constant intraluminal filling defect. Interobserver agreement was assessed by calculating kappa (κ) coefficients.Results: Out of the 24 V/Q PET-CT scans, the diagnostic conclusion was concordantly negative in 22 patients and concordantly positive in one patient. The remaining scan was interpreted as positive by one reader and negative by three readers. Out of the 24 CTPA scans, the diagnostic conclusion was concordantly negative in 16 and concordantly positive in one. Out of the seven remaining scans, PE was reported by one reader in four cases, by two readers in two cases, by three readers in one case. Most of discordant results on CTPA were related to clots reported on subsegmental arteries. Mean kappa coefficient was 0.79 for V/Q PET-CT interpretation and 0.39 for CTPA interpretation.Conclusions: Interobserver agreement in the interpretation of V/Q PET-CT for PE diagnosis was substantial (kappa 0.79) in a population with a low prevalence of significant PE. Agreement was lower with CTPA, mainly as a result of discrepancies at the level of the subsegmental arteries.

Dual Energy Imaging for Optimisation of P/V Ratios in VP SPECT

PurposeVentilation-perfusion single photon emission computed tomography (VP SPECT) plays an important role in pulmonary embolism diagnosis. Rapid results may be obtained using same-day ventilation followed by perfusion imaging, but generally requires careful attention to achieving an optimal count rate ratio (P/V ratio) of ~3:1. This study investigated whether the ratio of counts simultaneously acquired in adjacent primary and Compton-scatter energy windows (E_ratio) on V SPECT was predictive of final normalised perfusion count rate (PCRnorm) on P SPECT using [99mTc]Tc-macroaggregated albumin (MAA), allowing optimisation of P/V ratio. MethodsSame-day VP SPECT studies acquired using standard protocols in adult patients during a 2-year period were assessed. Studies were included provided they were acquired with correct imaging parameters, and injection site imaging and laboratory records were available for quality control and normalised count rate corrections. Extraction of DICOM information, and linear regression were performed using custom Python and R scripts. A predictive tool was developed in Microsoft Excel.ResultsOf 643 studies performed, the scans of 343 participants (median age 30.4 years, 318 female) met inclusion criteria. A single outlier with high influence was excluded after an obvious cause was identified. Final analysis of the remaining 342 scans yielded a significant regression equation (F(1,340) = 1057.3, p <.000), with an adjusted R2 of .756 and MSE of 0.001089. A prediction tool designed for routine clinic use was developed for predicting final P/V ratio.ConclusionThe ratio of simultaneously acquired counts in adjacent energy windows on V SPECT is linearly related to perfusion count rate after administration of a known activity of [99mTc]Tc- MAA. A predictive tool based on this work may assist in optimising the dose and timing of [99mTc]Tc-MAA administration in same-day studies to the benefit of patients and workflows.