Alexander Goehler1, Pamela M McMahon2, Heidi S Lumish2, Carol C Wu2, Vidit Munshi2, Michael Gilmore2, Jonathan H Chung2, Brian B Ghoshhajra2, Daniel Mark2, Quynh A Truong2, G Scott Gazelle2, Udo Hoffmann2. 1. From the Department of Radiology, Yale University, New Haven, CT (A.G.); Cardiac MR, PET CT Program, Department of Radiology (A.G., H.S.L., B.B.G., Q.A.T., U.H.), Institute for Technology Assessment (A.G., P.M.M., V.M., M.G., G.S.G.), and Department of Cardiology (Q.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School, Boston, MA (A.G., P.M.M., C.C.W., B.B.G., Q.A.T., G.S.G., U.H.); Division of Thoracic Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston (C.C.W.); Department of Radiology, National Jewish Health, Denver, CO (J.H.C.); Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, NC (D.M.); and Department of Health Management and Policy, Harvard School of Public Health, Boston, MA (G.S.G.). agoehler@post.harvard.edu. 2. From the Department of Radiology, Yale University, New Haven, CT (A.G.); Cardiac MR, PET CT Program, Department of Radiology (A.G., H.S.L., B.B.G., Q.A.T., U.H.), Institute for Technology Assessment (A.G., P.M.M., V.M., M.G., G.S.G.), and Department of Cardiology (Q.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School, Boston, MA (A.G., P.M.M., C.C.W., B.B.G., Q.A.T., G.S.G., U.H.); Division of Thoracic Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston (C.C.W.); Department of Radiology, National Jewish Health, Denver, CO (J.H.C.); Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, NC (D.M.); and Department of Health Management and Policy, Harvard School of Public Health, Boston, MA (G.S.G.).
Abstract
BACKGROUND: Pulmonary nodules (PNs) are often detected incidentally during coronary computed tomographic (CT) angiography, which is increasingly being used to evaluate patients with chest pain symptoms. However, the efficiency of following up on incidentally detected PN is unknown. METHODS AND RESULTS: We determined demographic and clinical characteristics of stable symptomatic patients referred for coronary CT angiography in whom incidentally detected PNs warranted follow-up. A validated lung cancer simulation model was populated with data from these patients, and clinical and economic consequences of follow-up per Fleischner guidelines versus no follow-up were simulated. Of the 3665 patients referred for coronary CT angiography, 591 (16%) had PNs requiring follow-up. The mean age of patients with PNs was 59±10 years; 66% were male; 67% had ever smoked; and 21% had obstructive coronary artery disease. The projected overall lung cancer incidence was 5.8% in these patients, but the majority died of coronary artery disease (38%) and other causes (57%). Follow-up of PNs was associated with a 4.6% relative reduction in cumulative lung cancer mortality (absolute mortality: follow-up, 4.33% versus non-follow-up, 4.54%), more downstream testing (follow-up, 2.34 CTs per patient versus non-follow-up, 1.01 CTs per patient), and an average increase in quality-adjusted life of 7 days. Costs per quality-adjusted life-year gained were $154 700 to follow up the entire cohort and $129 800 per quality-adjusted life-year when only smokers were included. CONCLUSIONS: Follow-up of PNs incidentally detected in patients undergoing coronary CT angiography for chest pain evaluation is associated with a small reduction in lung cancer mortality. However, significant downstream testing contributes to limited efficiency, as demonstrated by a high cost per quality-adjusted life-year, especially in nonsmokers.
BACKGROUND: Pulmonary nodules (PNs) are often detected incidentally during coronary computed tomographic (CT) angiography, which is increasingly being used to evaluate patients with chest pain symptoms. However, the efficiency of following up on incidentally detected PN is unknown. METHODS AND RESULTS: We determined demographic and clinical characteristics of stable symptomatic patients referred for coronary CT angiography in whom incidentally detected PNs warranted follow-up. A validated lung cancer simulation model was populated with data from these patients, and clinical and economic consequences of follow-up per Fleischner guidelines versus no follow-up were simulated. Of the 3665 patients referred for coronary CT angiography, 591 (16%) had PNs requiring follow-up. The mean age of patients with PNs was 59±10 years; 66% were male; 67% had ever smoked; and 21% had obstructive coronary artery disease. The projected overall lung cancer incidence was 5.8% in these patients, but the majority died of coronary artery disease (38%) and other causes (57%). Follow-up of PNs was associated with a 4.6% relative reduction in cumulative lung cancer mortality (absolute mortality: follow-up, 4.33% versus non-follow-up, 4.54%), more downstream testing (follow-up, 2.34 CTs per patient versus non-follow-up, 1.01 CTs per patient), and an average increase in quality-adjusted life of 7 days. Costs per quality-adjusted life-year gained were $154 700 to follow up the entire cohort and $129 800 per quality-adjusted life-year when only smokers were included. CONCLUSIONS: Follow-up of PNs incidentally detected in patients undergoing coronary CT angiography for chest pain evaluation is associated with a small reduction in lung cancer mortality. However, significant downstream testing contributes to limited efficiency, as demonstrated by a high cost per quality-adjusted life-year, especially in nonsmokers.
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