[Progress of Lung Cancer Screening with Low Dose Helical Computed Tomography].

Lung cancer which represents characteristics of a heavy disease burden, a large proportion of advanced lung cancer and a low five-year survival rate is a threat to human health. It is essential to implement population-based lung cancer screening to improve early detection and early treatment. The National Lung Screening Trial (NLST) demonstrated that screening with low dose helical computed tomography (LDCT) may decrease lung cancer mortality, which brings hope for the early diagnosis and treatment of lung cancer. In recent years, great progresses have been made on research of lung cancer screening with LDCT. However, whether LDCT could be applied to large population-based lung cancer screening projects is still under debate. In this paper, we review the recent progresses on history of lung cancer screening with LDCT, selection of high-risk individuals, management of pulmonary nodules, performance of screening, acceptance of LDCT and cost-effectiveness.
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[Model concept of the health economic evaluation of low-dose CT lung cancer screening in Hungary]. / Az alacsony dózisú CT-vel végzett tüdorákszurés magyarországi egészség-gazdaságtani elemzésének koncepcionális terve.

INTRODUCTION: Lung cancer is a rapidly progressing, often life-threatening disease that constitutes a huge societal burden. Because of the scarce resources of the Hungarian health care system, the cost-effectiveness of introducing low-dose computed tomography screening is a relevant health policy matter. AIM: The aim of this study is to design a model concept for assessing the cost-effectiveness of low-dose computed tomography lung cancer screening in Hungary, and to define the required steps for performing the analysis. METHOD: A targeted literature review was conducted to identify and synthesize the evidence on efficacy and effectiveness of screening, and results were evaluated based on adaptability to Hungarian settings. We also summarized the available Hungarian scientific evidence and reconstructed the potential patient pathways. RESULTS: In accordance with these findings, we recommend to perform the full health-economic evaluation of low-dose computed tomography lung cancer screening using a complex model structure that consists of several sub-models and is capable to follow the population at risk on life-time horizon. CONCLUSIONS: The proposed cost-effectiveness model will be suitable to provide data for further analyses that support decision-making on introducing low-dose computed tomography lung cancer screening as public health program. Orv Hetil. 2017; 158(25): 963-975.

Issues with implementing a high-quality lung cancer screening program.

After a comprehensive review of the evidence, the United States Preventive Services Task Force recently endorsed screening with low-dose computed tomography as an early detection approach that has the potential to significantly reduce deaths due to lung cancer. Prudent implementation of lung cancer screening as a high-quality preventive health service is a complex challenge. The clinical evaluation and management of high-risk cohorts in the absence of symptoms mandates an approach that differs significantly from that of symptom-detected lung cancer. As with other cancer screenings, it is essential to provide to informed at-risk individuals a safe, high-quality, cost-effective, and accessible service. In this review, the components of a successful screening program are discussed as we begin to disseminate lung cancer screening as a national resource to improve outcomes with this lethal cancer. This information about lung cancer screening will assist clinicians with communications about the potential benefits and harms of this service for high-risk individuals considering participation in the screening process.

Clinical implications and added costs of incidental findings in an early detection study of lung cancer by using low-dose spiral computed tomography.

INTRODUCTION: To prospectively evaluate the frequency and spectrum of incidental findings (IF) in a 5-year lung cancer screening program with low-dose spiral computed tomography (CT) and to estimate the additional costs of their imaging workup incurred from subsequent radiologic follow-up evaluation. MATERIALS AND METHODS: A total of 519 asymptomatic volunteers were enrolled. All IFs were reported and were considered clinically relevant if they required further evaluations or with clinical implications if they required more than one additional diagnostic test for characterization or medical and/or surgical intervention. RESULTS: IFs were commonly found (59.2%, 307/519 participants at baseline and 5.3% per year at 5-year follow-up [123 participants of 2341 LDsCT exams performed during follow-up], with an overall rate of 26.3%). IFs were categorized as previously unknown clinically relevant in 52 (10.0%) individuals at baseline. Of these, 36 (6.9%) individuals had IFs with clinical implications (10 clinically relevant, of which 6 had clinical implications, detected during the subsequent 5-year follow-up). The most common recommendations were for additional imaging of the thyroid and kidneys. Additional imaging was mainly performed by ultrasound (43/68 [63.2%]). Subsequent surgical intervention resulted from these findings in 7 (1.5%) subjects. Six malignancies were diagnosed (rate, 0.2% per year). Costs of subsequent radiologic follow-up studies were calculated as €4644.56 [U.S. $6575.04] at baseline and €1052.30 [U.S. $1489.69] at 5-year follow-up (average added costs per participant €8.95 [U.S. $12.67] and €2.25 [U.S. $3.19], respectively). CONCLUSIONS: Low-dose spiral CT commonly detects IFs. Some of these require further investigations to assess their clinical relevance. Although such IFs add little clinical benefit to the screening intervention, moderate incremental costs are incurred based on additional radiologic procedures generated during short-term follow-up, given the potential for positive effects on patient care.

[The role of multidetector CT in cardiovascular diagnosis: the CT coronary angiography. Current applications]. / Ruolo della TC multidetettore nella diagnostica cardiovascolare: la tomografia computerizzata coronarica. Recenti indicazioni.

Currently, computed tomographic (CT) imaging of the heart is mainly used for the quantification of coronary artery calcification as an indirect measure of coronary plaque burden and, less frequently, for minimally invasive coronary angiography. Recently, so-called multislice spiral computed tomographic (MSCT) scanners with gantry rotation speeds fast enough to produce diagnostic images of the heart under certain conditions have become widely available. As a consequence, cardiac CT imaging, most often performed for the purpose of calcium scoring, is increasingly applied. In this paper we provide a discussion of technical issues, applications, advantages, and limitations, after which we offer recommendations for current and future uses. To accomplish this, we conducted a comprehensive review of a study (Stacul et al. 2009) that was done to analyse the costs of 64-slice computed tomography (CT) coronary angiography and conventional coronary angiography and determine the cost-effectiveness of the two modalities.

Clinical perspective of coronary computed tomographic angiography in diagnosis of coronary artery disease.

Since a 4-detector row coronary computed tomographic angiography (CCTA) was launched in 1998, CCTA has experienced rapid improvement of imaging qualities with the ongoing evolution of computed tomography (CT) technology. The diagnostic accuracy of CCTA to detect coronary artery stenosis is well established, whereas improvements are still needed to reduce the overestimation of coronary artery disease (CAD) and assess plaque composition. CCTA has been used to evaluate CAD in various clinical settings. For example, CCTA could be an efficient initial triage tool at emergency departments for patients with acute chest pain with low-to-intermediate risk because of its high negative predictive value. In patients with suspected CAD, CCTA could be a cost-effective alternative to myocardial perfusion imaging and exercise electrocardiogram for the initial coronary evaluation of patients with intermediate pre-test likelihood suspected CAD. However, in asymptomatic populations, there is a lack of studies that show an improved prognostic power of CCTA over other modalities. Therefore, the clinical use of CCTA to detect CAD for purposes of risk stratification in asymptomatic individuals should be discouraged. As CT technology evolves, CCTA will provide better quality coronary imaging and non-coronary information with lower radiation exposure. Future studies should cover these ongoing technical improvements and evaluate the prognostic power of CCTA in various clinical settings of CAD in large, well-designed, randomized trials.

Can lung cancer screening by computed tomography be effective in areas with endemic histoplasmosis?

OBJECTIVE: Low-dose chest computed tomography (CT) is being evaluated in several national trials as a screening modality for the early detection of lung cancer. The goal of the present study was to determine whether lung cancer screening could be done while minimizing the number of benign biopsy specimens taken in an area endemic for histoplasmosis. METHODS: The subjects were recruited by letters mailed to area physicians and local advertisement. The inclusion criteria were age older than 50 years and at least a 20 pack-year smoking history. The exclusion criteria were symptoms suggestive of lung cancer or a history of malignancy in the previous 5 years. The participants completed a questionnaire and underwent a chest CT scan at baseline and annually for 5 years. The management of positive screening results was determined using a defined algorithm: annual follow-up CT scan for nodules less than 5 mm; 6-month follow-up CT scan for nodules 5 to 7 mm; review by our multidisciplinary tumor board for nodules 8 to 12 mm; and biopsy for nodules greater than 12 mm. RESULTS: A total of 132 patients were recruited. Of the 132 patients, 61% had positive baseline CT findings and 22% had positive findings on the annual CT scans. Six cancers were detected. Of these 6 patients, 5 had stage I disease and underwent lobectomy, and 1 had stage IIIA disease and underwent induction chemotherapy and radiotherapy followed by lobectomy. All patients were alive and disease free at a mean follow-up of 41.7 ± 18.6 months. No biopsies were performed for benign lesions. Also, no cancers were missed when the protocol was followed. CONCLUSIONS: Screening with CT can be done effectively in an area endemic for histoplasmosis while minimizing benign biopsies.

Whole-body MR imaging versus sequential multimodal diagnostic algorithm for staging patients with rectal cancer: cost analysis.

PURPOSE: To compare the direct costs of two diagnostic algorithms for pretherapeutic TNM staging of rectal cancer. MATERIALS AND METHODS: In a study including 33 patients (mean age: 62.5 years), the direct fixed and variable costs of a sequential multimodal algorithm (rectoscopy, endoscopic and abdominal ultrasound, chest X-ray, thoracic/abdominal CT in the case of positive findings in abdominal ultrasound or chest X-ray) were compared to those of a novel algorithm of rectoscopy followed by MRI using a whole-body scanner. MRI included T 2w sequences of the rectum, 3D T 1w sequences of the liver and chest after bolus injection of gadoxetic acid, and delayed phases of the liver. The personnel work times, material items, and work processes were tracked to the nearest minute by interviewing those responsible for the process (surgeon, gastroenterologist, two radiologists). The costs of labor and materials were determined from personnel reimbursement data and hospital accounting records. Fixed costs were determined from vendor pricing. RESULTS: The mean MRI time was 55 min. CT was performed in 19/33 patients (57%) causing an additional day of hospitalization (costs 374 euro). The costs for equipment and material were higher for MRI compared to sequential algorithm (equipment 116 vs. 30 euro; material 159 vs. 60 euro per patient). The personnel costs were markedly lower for MRI (436 vs. 732 euro per patient). Altogether, the absolute cost advantage of MRI was 31.3% (711 vs. 1035 euro for sequential algorithm). CONCLUSION: Substantial savings are achievable with the use of whole-body MRI for the preoperative TNM staging of patients with rectal cancer.

Lung cancer screening.

Lung cancer is the primary cause of cancer mortality in developed countries. First diagnosis only when disease has already reached the metastatic phase is the main reason for failure in treatment. To this regard, although low-dose spiral computed tomography (CT) has proven to be effective in the early detection of lung cancer (providing both higher resectability and higher long-term survival rates), the capacity of annual CT screening to reduce lung cancer mortality in heavy smokers has yet to be demonstrated. Numerous ongoing large-scale randomised trials are under way in high-risk individuals with different study designs. The initial results should be available within the next 2 years.

The present state of coronary computed tomography angiography a process in evolution.

In the past 5 years since the introduction of 64-detector row cardiac computed tomography angiography (CCTA), there has been an exponential growth in the quantity of scientific evidence to support the feasibility of its use in the clinical evaluation of individuals with suspected coronary artery disease (CAD). Since then, there has been considerable debate as to where CCTA precisely fits in the algorithm of evaluation of individuals with suspected CAD. Proponents of CCTA contend that the quality and scope of the available evidence to date support the replacement of conventional methods of CAD evaluation by CCTA, whereas critics assert that clinical use of CCTA is not yet adequately proven and should be restricted, if used at all. Coincident with the scientific debate underlying the clinical utility of CCTA, there has developed a perception by many that the rate of growth in cardiac imaging is disproportionately high and unsustainable. In this respect, all noninvasive imaging modalities and, in particular, more newly introduced ones, have undergone a higher level of scrutiny for demonstration of clinical and economic effectiveness. We herein describe the latest available published evidence supporting the potential clinical and cost efficiency of CCTA, drawing attention not only to the significance but also the limitations of such studies. These points may trigger discussion as to what future studies will be both necessary and feasible for determining the exact role of CCTA in the workup of patients with suspected CAD.

[Feasibility of a screening programme for lung cancer among workers previously heavily exposed to asbestos]. / Valutazione di un programma per la diagnosi precoce di cancro polmonare negli ex esposti ad asbesto.

BACKGROUND: We evaluated the feasibility and costs of a screening programme with spiral CT for the early diagnosis of lung cancer among workers previously heavily exposed to asbestos. METHODS: We invited 2000 workers, 1165 (58%) of whom accepted. Women and individuals with incomplete information were excluded; 1119 subjects (mean age, 57 years) entered the main analysis. Subjects with non-calcified lung nodules and/or dubious pleural plagues (No=338) entered a post-screening diagnostic protocol based on radiological follow-up. RESULTS: Twenty-five biopsies were performed (13 pulmonary, 9 pleural, 3 combined) revealed 5 cases of lung cancer (including 1 in stage IA). The positive predictive value of the screening test was low (31%) despite its known high sensitivity (100%) and specificity (99%). Incidence of lung cancer was similar to that registered among male residents of the Veneto Region aged 55 to 59 years. The cost of the programme was Euro 1,000 per screened subject and Euro 245,000 per diagnosis (total cost, Euro 1,181,310). The total radiation dose administered to healthy subjects was about 1,100 mSv (220 mSv per lung cancer diagnosis). CONCLUSIONS: This screening programme was ineffective due to the low participation rate, the small number of diagnoses, low predictive value, and high costs.

A prospective validation of a current practice: the detection of extremity vascular injury with CT angiography.

INTRODUCTION: Arteriography is the current "gold standard" for the detection of extremity vascular injuries. Less invasive than operative exploration, conventional arteriography (CA) still has a 1% to 3% risk of morbidity and may delay definitive repair. Recent improvements in computed tomography (CT) technology has since broadened the application of CT to include the diagnosis of cervical, thoracic, and now extremity vascular injury. We hypothesized that CT angiography (CTA) provides equivalent injury detection compared with the more invasive CA, but is more rapidly completed and more cost effective. METHODS: A prospective evaluation of patients, ages 18 to 50, with potential extremity vascular injuries was performed during 2006-2007. Ankle-brachial indices (ABI) of injured extremities were measured on presentation in all patients without hard signs of vascular injury. Patients whose injured extremity ABI was <0.9 were enrolled and underwent CTA followed by either CA or operative exploration if CTA findings were limb threatening. Interventionalists were blinded to CTA findings before performing and reading CAs. RESULTS: Twenty-one patients (mean age, 26.1 +/- 7.1 years) had 22 extremity CTAs after gunshot (82%), stab (9%), or pedestrian struck by automobile (9%) injuries to either upper (32%) or lower (68%) extremities. Eleven of 22 (50%) extremities had associated orthopedic injuries while the mean ABI of the study population was 0.72 +/- 0.21. Twenty-one of 22 (96%) CTAs were diagnostic and all CTAs were confirmed by either CA alone (n = 18), operative exploration (n = 2), or both CA and operative exploration (n = 2). Diagnostic CTAs had 100% sensitivity and specificity for clinically relevant vascular injury detection. Unlike rapidly obtained CTA, CA required 131 +/- 61 minutes (mean +/- SD) to complete. In our center, CTA saves $12,922 in patient charges and $1,166 in hospital costs per extremity when compared with CA. CONCLUSIONS: With acceptable injury detection, rapid availability, and a favorable cost profile, our results suggest that CTA may replace CA as the diagnostic study of choice for vascular injuries of the extremities.

Duplex ultrasound imaging alone is sufficient for midterm endovascular aneurysm repair surveillance: a cost analysis study and prospective comparison with computed tomography scan.

OBJECTIVE: Early in our experience with endovascular aortic aneurysm repair (EVAR) we performed both serial computed tomography scans and duplex ultrasound (DU) imaging in our post-EVAR surveillance regimen. Later we conducted a prospective study with DU imaging as the sole surveillance study and determined cost savings and outcome using this strategy. METHODS: From September 21, 1998, to May 30, 2008, 250 patients underwent EVAR at our hospital. Before July 1, 2004, EVAR patients underwent CT and DU imaging performed every 6 months during the first year and then annually if no problems were identified (group 1). We compared aneurysm sac size, presence of endoleak, and graft patency between the two scanning modalities. After July 1, 2004, patients underwent surveillance using DU imaging as the sole surveillance study unless a problem was detected (group 2). CT and DU imaging charges for each regimen were compared using our 2008 health system pricing and Medicare reimbursements. All DU examinations were performed in our accredited noninvasive vascular laboratory by experienced technologists. Statistical analysis was performed using Pearson correlation coefficient. RESULTS: DU and CT scans were equivalent in determining aneurysm sac diameter after EVAR (P < .001). DU and CT were each as likely to falsely suggest an endoleak when none existed and were as likely to miss an endoleak. Using DU imaging alone would have reduced cost of EVAR surveillance by 29% ($534,356) in group 1. Cost savings of $1595 per patient per year were realized in group 2 by eliminating CT scan surveillance. None of the group 2 patients sustained an adverse event such as rupture, graft migration, or limb occlusion as a result of having DU imaging performed as the sole follow-up modality. CONCLUSION: Surveillance of EVAR patients can be performed accurately, safely, and cost-effectively with DU as the sole imaging study.

[Contrast-enhanced ultrasound for the characterization of incidental liver lesions - an economical evaluation in comparison with multi-phase computed tomography]. / Kontrastverstärkter Ultraschall zur Charakterisierung von inzidentellen Leberläsionen - eine ökonomische Betrachtung im Vergleich zur Mehrphasen-Computertomografie.

AIM: The aim of the study was to conduct a cost-minimization analysis of contrast-enhanced ultrasound (CEUS) compared to multi-phase computed tomography (M-CT) as the diagnostic standard for diagnosing incidental liver lesions. METHODS: Different scenarios of a cost-covering realization of CEUS in the ambulant sector in the general health insurance system of Germany were compared to the current cost situation. The absolute savings potential was estimated using different approaches for the calculation of the incidence of liver lesions which require further characterization. RESULTS: CEUS was the more cost-effective method in all scenarios in which CEUS examinations where performed at specialized centers (122.18-186.53 euro) compared to M-CT (223.19 euro). With about 40 000 relevant liver lesions per year, systematic implementation of CEUS would result in a cost savings of 4 m euro per year. However, the scenario of a cost-covering CEUS examination for all physicians who perform liver ultrasound would be the most cost-intensive approach (e. g., 407.87 euro at an average utilization of the ultrasound machine of 25 %, and a CEUS ratio of 5 %). CONCLUSION: A cost-covering realization of the CEUS method can result in cost savings in the German healthcare system. A centralized approach as proposed by the DEGUM should be targeted.

The pre-test risk stratified cost-effectiveness of 64-slice computed tomography coronary angiography in the detection of significant obstructive coronary artery disease in patients otherwise referred to invasive coronary angiography.

BACKGROUND: This study evaluates the cost-effectiveness of 64-slice computed tomography coronary angiography (CTCA) as an alternative to invasive diagnostic coronary angiography (CA) in an elective outpatient setting for patients otherwise referred to invasive diagnostic coronary angiography. METHODS: Taking the perspective of the Australian health system we used a decision analytic model to integrate data on test accuracy along with complication rates, health state preference weights and health care costs. The analysis is pre-test risk stratified based on Bayes' theorem of conditional probability. Incremental cost-effectiveness ratios (ICER) are the study endpoints expressed as incremental costs per quality adjusted life year (QALY) gained. RESULTS: The results indicate that CTCA is a cost-saving strategy offering a higher health related quality of life up to approximately 65% pre-test risk of coronary artery disease (CAD). Above that threshold the model predicts a cost-utility trade-off with every gain in health related quality of life through the use of CTCA as a rule-out test being associated with additional costs when compared to invasive diagnostic CA. CONCLUSION: This health economic analysis predicts computed tomography coronary angiography to be a cost-effective rule-out strategy in symptomatic patients at low to intermediate risk of significant obstructive coronary artery disease otherwise referred to invasive diagnostic CA.

Potential of computer-aided diagnosis to improve CT lung cancer screening.

The development of low-dose spiral computed tomography (CT) has rekindled hope that effective lung cancer screening might yet be found. Screening is justified when there is evidence that it will extend lives at reasonable cost and acceptable levels of risk. A screening test should detect all extant cancers while avoiding unnecessary workups. Thus optimal screening modalities have both high sensitivity and specificity. Due to the present state of technology, radiologists must opt to increase sensitivity and rely on follow-up diagnostic procedures to rule out the incurred false positives. There is evidence in published reports that computer-aided diagnosis technology may help radiologists alter the benefit-cost calculus of CT sensitivity and specificity in lung cancer screening protocols. This review will provide insight into the current discussion of the effectiveness of lung cancer screening and assesses the potential of state-of-the-art computer-aided design developments.

Utility of helical computed tomography to evaluate the invasion of actinomycetoma; a report of 21 cases.

BACKGROUND: Actinomycetoma is a chronic infection caused by several aerobic actinomycetes; it is a relatively frequent condition in tropical countries like Mexico. It is important to be aware of the extension and depth of the disease (bone and visceral) to make the prognosis and select treatment. OBJECTIVES: Our objective was to evaluate actinomycetomas using helical computed tomography (HCT) as well as its three-dimensional (3D) reconstruction. MATERIAL AND METHODS: Prospective study of clinically and microbiologically proven cases of actinomycetomas, all of them recently diagnosed and untreated or unresponsive to various treatments. All patients underwent simple and contrast HCT with various helical slices of the involved zones. Then three-dimensional reconstructions on the sagittal and coronal planes were made. RESULTS: Twenty-one patients with actinomycetomas were included, 19 males and two females, with a mean age of 35.5 years and mean duration of disease of 4.1 years. The disease was located in the lower limbs in 81%, and in the upper limbs and trunk in 19%. Twenty of the 21 cases were caused by Nocardia brasiliensis and one by Actinomadura madurae. In all patients the disease was localized to the skin and subcutaneous tissue; 76.2% had muscular involvement; 23.8% visceral involvement; 9.5% had bone involvement and 9.5% vascular involvement. The affected area was determined in each case. CONCLUSIONS: HCT provides precise information about the grade of invasion at diverse levels such as visceral, muscular and vascular systems, and the calculation of the affected area.