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Ellis type 4 coronary artery perforation (CAP4), also referred to as Ellis type 3 cavity-spilling perforation, is a rare but life-threatening complication of percutaneous coronary intervention characterized by extravasation of blood into a cardiac chamber, anatomic cavity, or coronary sinus or vessel. CAP4 is uncommon, accounting for 1.9% to 3.0% of all CAP. Only 11 cases of CAP4 have been reported in detail; we report an additional two cases and review prior reports of this rare complication. Our first case highlights a patient with chronic anginal symptoms due to a 75% concentric stenotic lesion in the mid-LAD. Revascularization was complicated by perforation during pre-dilation with robust contrast extravasation into the left ventricle. Successful postperforation hemostasis was achieved with heparin reversal and covered stent placement. The second case demonstrates another major mechanism of CAP4: wire perforation. During intervention, the absence of blood flow distal to the lesion in the setting of an ST segment elevation myocardial infarction obscured the course of the nonhydrophilic floppy wire leading to perforation that was managed conservatively. In our scoping review, we found that the majority of CAP4 occurred in the LAD. The most frequently involved cavity was the left ventricle-other cavities involved were the right ventricle and coronary veins. Common etiologies of CAP4 included guidewire perforation (62%) and balloon dilation (31%). Perforation was managed with reversal of anticoagulation in 46% of cases, prolonged balloon inflation in 54% of cases, and covered stent deployment in 15% of cases. No patients required surgical repair or pericardiocentesis and perforations were successfully sealed in all cases. In-hospital mortality was 0%.
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Intervención Coronaria Percutánea , Lesiones del Sistema Vascular , Humanos , Vasos Coronarios/diagnóstico por imagen , Resultado del Tratamiento , Intervención Coronaria Percutánea/efectos adversos , Pericardiocentesis/efectos adversos , Lesiones del Sistema Vascular/diagnóstico por imagen , Lesiones del Sistema Vascular/etiología , Lesiones del Sistema Vascular/cirugía , Angiografía Coronaria/efectos adversos , Stents/efectos adversosRESUMEN
BACKGROUND: Acute pancreatitis can rarely present with electrocardiographic changes that imitate myocardial ischemia. Even rarer is for acute pancreatitis to present with ST segment elevation in contiguous leads, suggestive of an acute coronary syndrome. In this comprehensive review article, we highlight diagnostic challenges and examine possible pathophysiological causes as seen through 34 total cases in which acute pancreatitis has been found to mimic an acute myocardial infarction. SUMMARY: It has been shown that regardless of the severity of acute pancreatitis, it can be associated with myocardial injury of varying presentation. Thus far, there have been 34 total cases where acute pancreatitis presented with electrocardiographic changes consistent with acute myocardial infarction without true coronary artery thrombosis. An inferior wall ST-elevation myocardial infarction pattern was the most frequently demonstrated. Many hypotheses have been proposed as to the mechanism of injury including decreased coronary perfusion, direct myocyte damage by pancreatic proteolytic enzymes, indirect parasympathetic injury, electrolyte derangements, and coronary vasospasms. Given the complexity of the clinical presentation, thorough subjective and objective evaluation can be vital in guiding to diagnosis and possibly more invasive testing. KEY MESSAGES: It is imperative that clinicians are aware that acute pancreatitis can mimic an acute myocardial infarction. Although we have started to better understand the pathological mechanisms for this phenomenon, further research focused on specific molecular target areas is needed.
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Infarto de la Pared Inferior del Miocardio , Infarto del Miocardio , Isquemia Miocárdica , Pancreatitis , Humanos , Pancreatitis/complicaciones , Pancreatitis/diagnóstico , Enfermedad Aguda , Infarto del Miocardio/complicaciones , Electrocardiografía , Isquemia Miocárdica/complicacionesRESUMEN
Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), primarily a respiratory virus causing coronavirus disease 2019 (COVID-19) pneumonia, induces a hypercoagulable state. Previous studies comparing the prevalence of venous thromboembolism (VTE) in patients with COVID-19 pneumonia and those with influenza pneumonia revealed a higher risk of pulmonary embolism (PE) and deep vein thrombosis (DVT) associated with COVID-19 pneumonia. However, these studies have not adequately accounted for the severity and acuity of the presenting viral pneumonia. Methods: In this retrospective study, we rigorously adjusted for critical illness using a nationally representative dataset to investigate whether COVID-19 pneumonia is independently linked to a higher risk of PE and DVT. Results: After comprehensive multivariate adjustment, our findings demonstrated that patients with COVID-19 pneumonia maintained significantly higher odds of developing acute inpatient PE [adjusted odds ratio (aOR): 2.48; 95% confidence interval (CI): 2.16-2.86; P<0.01] and DVT (aOR: 1.66; 95% CI: 1.41-1.96; P<0.01) during the early pandemic compared to patients with influenza pneumonia. Furthermore, we identified congenital heart disease and malnutrition as novel risk factors for acute PE in COVID-19 patients. Conclusions: Our study suggests that the higher prevalence of acute inpatient PE over DVT in patients with COVID-19 pneumonia may support a "thrombus in situ" mechanism of SARS-CoV-2-mediated pulmonary thrombosis. Consequently, clinicians should maintain a high index of suspicion for PE, even in the absence of DVT, among patients with COVID-19 pneumonia and should follow evidence-based guidelines for diagnosis and management.
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Coronavirus Disease 2019 (COVID-19) has been linked to severe consequences among hospitalized patients diagnosed with pulmonary hypertension (PH), as evidenced by a limited number of studies. Our retrospective study employed the National Inpatient Sample (NIS) database to evaluate in-hospital mortality and various clinical outcomes in COVID-19 patients with and without PH. This study included all patients ages 18 years and above who were hospitalized in the United States from January 1,2020 to December 31, 2020 with a COVID-19 diagnosis. The patients were then divided into 2 cohorts based on their PH status. After multivariate adjustment, we discovered that COVID-19 patients with PH experienced considerably higher in-hospital mortality, longer hospital stays, and higher costs of hospitalization when compared to COVID-19 patients without PH. Moreover, we observed an increased dependence on invasive and noninvasive positive pressure ventilation among COVID-19 patients with PH, indicating more severe respiratory failure. Our findings suggest that COVID-19 patients with PH had a heightened risk of acute pulmonary embolism and myocardial infarction while hospitalized. Lastly, among COVID-19 patients with PH, Hispanic and Native American patients demonstrated a persistently higher risk of in-hospital mortality compared to other racial groups. To our knowledge, this is the most comprehensive study of outcomes for COVID-19 patients with PH. The observed inpatient mortality appears to be driven by in-hospital complications, particularly pulmonary embolism. Given the substantial mortality and complications associated with COVID-19 and PH, we advocate for SARS-CoV-2 vaccination and the implementation of aggressive nonpharmacological preventive measures.
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COVID-19 , Hipertensión Pulmonar , Embolia Pulmonar , Humanos , Estados Unidos/epidemiología , COVID-19/complicaciones , SARS-CoV-2 , Estudios Retrospectivos , Hipertensión Pulmonar/epidemiología , Mortalidad Hospitalaria , Pandemias , Prueba de COVID-19 , Vacunas contra la COVID-19 , Grupos Raciales , Embolia Pulmonar/epidemiología , Embolia Pulmonar/terapiaRESUMEN
The COVID-19 pandemic has impacted healthcare delivery to patients with ST-segment elevation myocardial infarction (STEMI). The aim of our retrospective study was to determine the effect of COVID-19 on inpatient STEMI outcomes and to investigate changes in cardiac care delivery during 2020. We utilized the National Inpatient Sample database to examine inpatient mortality and cardiac procedures among STEMI patients with and without COVID-19. In our study, STEMI patients with COVID-19 had higher inpatient mortality (47.4% vs. 11.2%, aOR: 3.8, 95% CI: 3.2−4.6, p < 0.001), increased length of stay (9.0 days vs. 4.3 days, p < 0.001) and higher cost of hospitalization (USD 172,518 vs. USD 131,841, p = 0.004) when compared to STEMI patients without COVID-19. STEMI patients with COVID-19 also received significantly less invasive cardiac procedures (coronary angiograms: 30.4% vs. 50.8%, p < 0.001; PCI: 32.9% vs. 70.1%, p < 0.001; CABG: 0.9% vs. 4.1%, p < 0.001) and were more likely to receive systemic thrombolytic therapy (4.2% vs. 1.1%, p < 0.001) when compared to STEMI patients without COVID-19. Our findings are the result of complications of SARS-CoV2 infection as well as alterations in healthcare delivery due to the burden of the COVID-19 pandemic.
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The pathophysiology of Bradycardia-Renal Failure-Atrioventricular Nodal Blockade-Shock-Hyperkalemia (BRASH) syndrome involves acute renal injury leading to ineffective clearance of AV nodal agents and potassium. Theoretically, the synergy between AV nodal blockade and hyperkalemic cardiac dysconduction results in circulatory collapse at less-than-expected doses of both. Our study aims to characterize the presentation of BRASH and provide clinical evidence of its risk factors. This systematic review comprises all reported cases of BRASH until February 2022. The average age and Charleston Comorbidity Index at presentation was 69 years and 3.8 respectively - hypertension (71%) was most prevalent followed by diabetes mellitus (48%) and chronic kidney disease (44%). The most frequent presenting complaint was fatigue or syncope (49%). More than half of all patients presented with nonsevere hyperkalemia (less than 6.5 mmol/L) and the mean serum creatinine was 3.6 mg/dL. Beta-blockers (75%) were the most commonly implicated nodal agents. Presenting mean arterial pressure was 62 mm Hg and heart rate averaged 36 bpm; junctional escape rhythm (50%), sinus bradycardia (17.1%), and complete heart block (12.9%) were generally observed on EKG. While most patients responded to medical management, 20% of patients required renal replacement therapy and 33% required transvenous or transcutaneous pacing. No patients underwent permanent pacemaker placement and the in-hospital mortality of BRASH was 5.7%. The diagnosis of BRASH requires a high index of suspicion; its synergistic pathology results in a dramatic clinical presentation that can be easily overlooked. As hypothesized, the degree of renal failure and hyperkalemia are not congruent with the presenting circulatory shock. The significant mortality of this syndrome presents an opportunity for intervention with timely recognition.
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Bloqueo Atrioventricular , Hiperpotasemia , Insuficiencia Renal , Choque , Humanos , Hiperpotasemia/diagnóstico , Hiperpotasemia/epidemiología , Hiperpotasemia/etiología , Bradicardia/diagnóstico , Bradicardia/epidemiología , Bradicardia/etiología , Choque/complicaciones , Bloqueo Atrioventricular/complicaciones , Arritmias CardíacasRESUMEN
BACKGROUND: Hospital readmissions are core indicators of the quality of health care provision. OBJECTIVE: To understand factors associated with 30-day, all-cause hospital readmission rate for patients with COVID-19 in the United States during the early pandemic by utilizing the Nationwide Readmissions Database. METHODS: This retrospective study characterized the 30-day, all-cause hospital readmission rate for patients with COVID-19 in the United States during the early pandemic by utilizing the Nationwide Readmissions Database. RESULTS: The 30-day, all-cause hospital readmission rate in this population was 3.2%. We found the most common diagnoses at readmission to be sepsis, acute kidney injury, and pneumonia. Chronic alcoholic liver cirrhosis and congestive heart failure were prominent predictors of readmission among patients with COVID-19. Moreover, we found that younger patients and patients from economically disadvantaged backgrounds were at higher risk of 30-day readmission. Acute complications during index hospitalization, including acute coronary syndrome, congestive heart failure, acute kidney injury, mechanical ventilation, and renal replacement therapy, also increased the risk of 30-day readmission for patients with COVID-19. CONCLUSION: Based on the results of our study, we advise clinicians to promptly recognize patients with COVID-19 who are at high risk of readmission, and to subsequently manage their underlying comorbidities, to institute timely discharge planning, and to allocate resources to underprivileged patients in order to decrease the risk of 30-day hospital readmissions.
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Lesión Renal Aguda , COVID-19 , Insuficiencia Cardíaca , Humanos , Estados Unidos/epidemiología , Readmisión del Paciente , Estudios Retrospectivos , COVID-19/epidemiología , Pandemias , Factores de Riesgo , Insuficiencia Cardíaca/epidemiología , Insuficiencia Cardíaca/terapia , Lesión Renal Aguda/epidemiología , Lesión Renal Aguda/terapia , Bases de Datos FactualesRESUMEN
Acute pancreatitis (AP) and acute coronary syndrome (ACS) are common conditions, occasionally sharing overlapping symptoms, posing various clinical challenges. This study aims to investigate the demographics, outcomes, and risk factors of patients admitted with AP and ACS using the National Inpatient Sample database. The database from 2016 to 2019 was analyzed, identifying patients with a primary diagnosis of AP and dividing them into 2 groups: those with ACS and those without (non-ACS). Of the 112,874 patients with AP, 5,210 (0.46%) had ACS. The patients with AP with concomitant ACS were older, predominantly male, and had a higher prevalence of co-morbidities. Inpatient mortality was significantly higher in the AP with concomitant ACS cohort compared with the AP without ACS cohort (8.4% vs 0.5%, adjusted odds ratio 9.94, 95% confidence interval 7.79 to 12.67, p <0.05). In conclusion, patients with AP and ACS experienced worse clinical outcomes.
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Síndrome Coronario Agudo , Infarto del Miocardio , Pancreatitis , Humanos , Masculino , Femenino , Pancreatitis/complicaciones , Pancreatitis/epidemiología , Pacientes Internos , Enfermedad Aguda , Infarto del Miocardio/epidemiología , Infarto del Miocardio/complicaciones , Factores de Riesgo , Mortalidad HospitalariaRESUMEN
Takotsubo syndrome (stress cardiomyopathy) has become a well-known complication of COVID-19 infections, with limited large-scale studies evaluating outcomes. We used the National Inpatient Sample (NIS) database to compare COVID-19 patients with and without stress cardiomyopathy. A total of 1,659,040 patients were included in the study: COVID-19 with stress cardiomyopathy (nâ¯=â¯1665, 0.1%) and COVID-19 without stress cardiomyopathy (nâ¯=â¯1657, 375, and 99.9%). The primary outcome was in-hospital mortality, with secondary analysis with propensity matching performed to confirm results from traditional multivariate analysis. COVID-19 patients with stress cardiomyopathy had significantly increased in-hospital mortality compared to COVID-19 patients without stress cardiomyopathy (32.8% vs 14.6%, adjusted OR [aOR]: 2.3 [95% CI, 1.2-4.5], Pâ¯=â¯0.01) along with significantly increased mechanical ventilation and vasopressor support, hospitalization charge, acute kidney injury requiring hemodialysis, cardiogenic shock, and cardiac arrest. These results emphasize the need for more research to reduce worse outcomes with COVID-19-related stress cardiomyopathy patients.
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COVID-19 , Cardiomiopatía de Takotsubo , Humanos , Estados Unidos/epidemiología , Pacientes Internos , Cardiomiopatía de Takotsubo/complicaciones , Cardiomiopatía de Takotsubo/epidemiología , Cardiomiopatía de Takotsubo/terapia , COVID-19/complicaciones , Hospitalización , Choque CardiogénicoRESUMEN
Despite increased female representation in medical training, women physicians continue to be under-represented in academic cardiology, particularly in senior roles of authorship and leadership. We analyzed the top 20 most-cited cardiology journals (31,540 total articles) between January 1, 2018 and October 31, 2021 for gender distribution of editorial staff and authorship. Our data demonstrated that only 27% of articles had women as first authors and 20% as senior authors. Women constituted 23% of editorial staff. There is a statistically significant negative correlation (Râ¯=â¯0.67, Pâ¯=â¯0.0011) between the percentage of women as first authors and the percentage of men on editorial boards. Overall, female authorship increased from 26% first and 19% senior authors in 2018, to 29% first and 22% senior authors in 2021. Women authors are significantly under-represented in academic cardiology publications, and additional work is needed to identify and address barriers to publishing and academic advancement for women in cardiology.
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Cardiología , Publicaciones Periódicas como Asunto , Masculino , Humanos , Femenino , Sexismo , Autoria , EdiciónRESUMEN
This study examines in-hospital mortality and complicated COVID-19 infection among adult congenital heart disease (ACHD) patients admitted with COVID-19, using the National Inpatient Sample (NIS). A total of 4219 COVID-19 patients with ACHD were included. We demonstrated that COVID-19 patients with ACHD were more likely to experience in-hospital mortality (OR 1.04, 95% CI 1.04-1.04, P < 0.01) and complicated COVID-19 infection (OR: 1.30, 95% CI: 1.11-1.53, P < 0.01). In our sub-group analysis, COVID-19 patients with tetralogy of Fallot (TOF) had higher mortality and COVID-19 patients with atrial septal defects (ASD) had a higher incidence of complicated infection when compared to COVID-19 patients with all other ACHDs. Risk factors for mortality among COVID-19 patients with ACHD include advanced age, lower income, unrepaired ACHD, malnutrition, and chronic liver disease. Accordingly, we recommend aggressive preventive care with vaccination and non-pharmacologic measures in order to improve survival for ACHD patients.
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COVID-19 , Cardiopatías Congénitas , Tetralogía de Fallot , Adulto , Humanos , Cardiopatías Congénitas/complicaciones , Cardiopatías Congénitas/epidemiología , Estudios Retrospectivos , Pacientes Internos , COVID-19/complicaciones , COVID-19/epidemiologíaRESUMEN
Background: Depression is one of the most common symptoms experienced by multiple sclerosis patients and may be secondary to the disease itself as well as other variables such as age, disease severity and side effects of treatment. Objective: To determine if there is an association between disease modifying therapies and depression rates based on PHQ9 scores in multiple sclerosis. Methods: This was a retrospective chart review. Patients followed at the University of Texas Southwestern Multiple Sclerosis and Neuroimmunology Clinic from 2017 to 2020 were included in this study. Patients' most recent PHQ-9 scores were used. The following data was extracted from patient charts: disease modifying therapy, age, disease duration, gender, antidepressant use and ambulatory status. Results: Data from our study included 2611 individual PHQ-9 scores. The majority of our patients were female and the mean age across all treatment groups was 50.37 years old. The median disease duration across all treatment groups was 12.74 years. Most patients in this cohort required no ambulatory assistance. 43.86% of patients were on antidepressants and use was correlated with a higher PHQ9 score. The median PHQ 9 score across all treatment groups was 4 (Interquartile range = 7). Across treatment groups, patients on interferon therapy had the lowest PHQ 9 scores with a median of 2. Conclusions: Our study demonstrated that there were lower PHQ-9 scores among interferon treatment group as compared to other disease modifying therapies and non-treatment groups.
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The COVID-19 pandemic has impacted healthcare delivery to patients with non-ST-segment elevation myocardial infraction (NSTEMI). The aim of our retrospective study is to determine the effect of COVID-19 on inpatient NSTEMI outcomes and to investigate whether changes in cardiac care contributed to the observed outcomes. After multivariate adjustment, we found that NSTEMI patients with COVID-19 had a higher rate of inpatient mortality (37.3% vs. 7.3%, adjusted odds ratio: 4.96, 95% CI: 4.6−5.4, p < 0.001), increased length of stay (9.9 days vs. 5.4 days, adjusted LOS: 3.6 days longer, p < 0.001), and a higher cost of hospitalization (150,000 USD vs. 110,000 USD, inflation-adjusted cost of hospitalization: 36,000 USD higher, p < 0.001) in comparison to NSTEMI patients without COVID-19, despite a lower burden of pre-existing cardiac comorbidity. NSTEMI patients with COVID-19 also received less invasive cardiac procedures (coronary angiography: 8.7% vs. 50.3%, p < 0.001; PCI: 4.8% vs. 29%, p < 0.001; and CABG: 0.7% vs. 6.2%, p < 0.001). In our study, we observed increased mortality and in-hospital complications to be a combined effect of COVID-19 infection and myocardial inflammation as a result of cytokine storm, prothrombic state, oxygen supply/demand imbalance and alterations in healthcare delivery from January to December 2020.
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Approximately 25% of patients with staphylococcus aureus bacteremia (SAB) develop infective endocarditis (IE), which has a consequent mortality of 25-46%. Current guidelines recommend routine transthoracic echocardiography (TTE) for patients with SAB; transesophageal echocardiogram (TEE) is reserved for those in whom initial TTE is negative and clinical suspicion for IE remains high. We sought to elucidate high risk features of SAB associated with the development of IE that warrant a TEE after a negative TTE. This retrospective study included 213 patients who were diagnosed with SAB at the University of New Mexico Hospital between 2010-2020. A pre-determined list of clinical risk factors along with TTE and TEE status was extracted from the electronic medical record. The primary outcome was development of IE in patients with SAB. Multivariate logistic regression analysis was used to identify clinical risk factors for IE. Moreover, sensitivity and specificity of TTE and TEE was calculated. Out of 213 patients with SAB, 68 patients met diagnostic criteria for IE. Most patients (n = 209) underwent TTE and 171 patients underwent subsequent TEE. The overall sensitivity of TTE was 63% and overall sensitivity of TEE was 88%. Multivariate analysis showed significantly increased risk of IE in patients who had implanted permanent pacemaker (aOR 32.3, CI 5.23 - 281, p < 0.001) and persistent fever (aOR 6.97, CI 2.42 - 21.0 P < 0.001). Based on our analysis, we recommend that TEE should be strongly considered after negative TTE in SAB patients with intracardiac prosthetics or persistent fever despite appropriate antibiotic therapy.
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Bacteriemia , Endocarditis , Infecciones Estafilocócicas , Antibacterianos , Bacteriemia/complicaciones , Bacteriemia/diagnóstico , Bacteriemia/epidemiología , Ecocardiografía Transesofágica , Endocarditis/diagnóstico , Endocarditis/diagnóstico por imagen , Humanos , Estudios Retrospectivos , Factores de Riesgo , Infecciones Estafilocócicas/complicaciones , Infecciones Estafilocócicas/diagnóstico , Staphylococcus aureusRESUMEN
BACKGROUND: Lung cancer screening trials generally enroll motivated, relatively healthy, and adherent populations. We therefore evaluated the prevalence and effects of comorbidities in a real-world population undergoing low-dose computed tomography (LDCT) scans. PATIENTS AND METHODS: We calculated the Charlson Comorbidity Index (CCI) of patients for whom an initial low-dose computed tomography (LDCT) for lung cancer screening was ordered between February 2017 and February 2019 in an integrated safety-net healthcare system. We examined the association between CCI and initial LDCT completion using multivariable logistic regression, assessed the association between specific medical comorbidity and LDCT completion using Chi-square test or Fisher's exact test as appropriate, and examined the association between CCI and LDCT Lung-RADS results using Fisher's exact test. RESULTS: A total of 1358 patients were included in the analysis. Mean age was 63 years, 57% were women, and 50% were Black. Patients had moderate comorbidity burden (median CCI 3) with chronic pulmonary disease the most common comorbidity. Overall, 943 LDCT (70%) were completed. There was no difference in 30-day, 90-day, or 1-year completion rates of initial LDCT according to CCI. However, 30-day LDCT completion rates did increase over time (P < .001). Lung-RADS scores were not associated with CCI. CONCLUSION: In a real-world setting, patients undergoing lung cancer screening have moderate comorbidity burden. The degree and type of medical comorbidity are not associated with initial screening completion or results. Timeliness of LDCT completion may improve as program experience increases.
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Detección Precoz del Cáncer , Neoplasias Pulmonares , Comorbilidad , Detección Precoz del Cáncer/métodos , Femenino , Humanos , Neoplasias Pulmonares/diagnóstico , Neoplasias Pulmonares/epidemiología , Masculino , Tamizaje Masivo , Persona de Mediana Edad , Prevalencia , Tomografía Computarizada por Rayos X/métodosRESUMEN
BACKGROUND: Less than 5% of eligible individuals in the United States undergo lung cancer screening. Variation in clinicians' participation in lung cancer screening has not been determined. PATIENTS AND METHODS: We studied medical providers who ordered ≥ 1 low-dose computed tomography (LDCT) for lung cancer screening from February 2017 through February 2019 in an integrated safety-net healthcare system. We analyzed associations between provider characteristics and LDCT orders and completion using chi-square, Fisher exact, and Student t tests, as well as ANOVA and multinomial logistic regression. RESULTS: Among an estimated 194 adult primary care physicians, 144 (74%) ordered at least 1 LDCT, as did 39 specialists. These 183 medical providers ordered 1594 LDCT (median, 4; interquartile range, 2-9). In univariate and multivariate models, family practice providers (P < .001) and providers aged ≥ 50 years (P = .03) ordered more LDCT than did other clinicians. Across providers, the median proportion of ordered LDCT that were completed was 67%. The total or preceding number of LDCT ordered by a clinician was not associated with the likelihood of LDCT completion. CONCLUSION: In an integrated safety-net healthcare system, most adult primary care providers order LDCT. The number of LDCT ordered varies widely among clinicians, and a substantial proportion of ordered LDCT are not completed.