Dr. Horomanski specializes in the diagnosis and treatment of rheumatologic diseases. She received her undergraduate degree from Case Western Reserve University, medical degree from Wright State University, and completed her Internal Medicine residency and Rheumatology fellowship at Stanford University. She is the Director of the Stanford Vasculitis Clinic where she manages the complex care of patients with all types of vasculitis and works closely with partners in related specialties. She has a specific interest in clinical trials and a Graduate Certificate in Epidemiology and Clinical Research. Dr. Horomanski also received training in musculoskeletal ultrasound from the USSONAR program and is an integral part of Stanford's Diagnostic and Interventional Musculoskeletal Ultrasound Clinic. Additional areas of research include the application of ultrasound in the study and management of rheumatologic diseases.

Clinical Focus

  • Rheumatology
  • Vasculitis
  • Diagnostic and Interventional Rheumatologic Ultrasonography

Academic Appointments

Professional Education

  • Board Certification: American Board of Internal Medicine, Internal Medicine (2018)
  • Board Certification: American Board of Internal Medicine, Rheumatology (2020)
  • Graduate Certificate, Stanford University, Epidemiology and Clinical Research (2020)
  • Fellowship: Stanford University Immunology and Rheumatology Fellowship (2020) CA
  • Residency: Stanford University Internal Medicine Residency (2015) CA
  • Medical Education: Wright State University (2015)
  • Board Certification, American Board of Internal Medicine, Internal Medicine (2018)
  • Medical Education, Wright State University, School of Medicine (2015)
  • Bachelor of Arts, Case Western Reserve University, Biology; Spanish Language (2011)

All Publications

  • Increased Risk of Preterm Delivery Subtypes and Hypertensive Disorders of Pregnancy in First Deliveries of Patients With Systemic Vasculitis. ACR open rheumatology Horomanski, A., Mayo, J., Shaw, G. M., Simard, J. F. 2024


    The goal of this study was to investigate the risk of preterm birth subtypes and hypertensive disorders of pregnancy in patients with systemic vasculitis using large, statewide databases.Births to nulliparous patients with prevalent systemic vasculitides (Takayasu arteritis [TAK], Behçet disease [BD], antineutrophil cytoplasmic antibody-associated vasculitis [AAV], and Kawasaki disease [KD]) were identified using International Classification of Diseases, Ninth Revision codes in linked administrative data and birth records from the California Department of Health Care Access and Information and California Vital Statistics from 1991 to 2012. Hypertensive disorders of pregnancy and preterm delivery (PTD) subtypes were identified. Multivariable-adjusted Poisson models estimated risk ratios (RRs) of these outcomes compared with the general birthing population without history of rheumatic disease.A total of 96 births to nulliparous patients with systemic vasculitis were identified (TAK, 14; AAV, 31; BD, 26; KD, 15) and compared with 4,191,900 births of the nulliparous general population. Adjusted RRs for all PTD types were elevated in patients with vasculitis (RR 3.21, 95% confidence interval [CI] 2.15-4.79), as were the RRs of all PTD subtypes including preterm premature rupture of membranes (RR 4.30, 95% CI 2.05-9.01) and spontaneous PTD (RR 4.99, 95% CI 3.01-8.28). Of the spontaneous PTDs among patients with vasculitis, 16.7% were early PTDs (20-31 weeks), with the remaining 83.3% occurring between 32 to 36 weeks. Patients with vasculitis also had an elevated risk of hypertensive disorders of pregnancy (RR 2.96, 95% CI 1.72-5.10).Among first-time births, we found that patients with systemic vasculitis have an elevated risk of PTD subtypes as well as hypertensive disorders of pregnancy.

    View details for DOI 10.1002/acr2.11702

    View details for PubMedID 38970474

  • Evolution and impact of a dedicated ultrasound clinic on clinical rheumatology practice at an academic medical center. Seminars in arthritis and rheumatism Fairchild, R. M., Deluna, M. D., Golovko, V., Mar, D. A., Baker, M. C., Nishio, J., Horomanski, A. L. 2023; 63: 152276


    Rheumatologic ultrasonography (RhUS) has grown in scope and application over the past 20 years. While many studies have shown the benefits of RhUS, few have investigated the efficacy of a dedicated clinic. This study explores the impact of a dedicated ultrasound clinic on patients and rheumatologists at an academic medical center (AMC).We analyzed claims data for patient visits, X-rays (XR), magnetic resonance imaging (MRI), and RhUS from an AMC with an established RhUS clinic, alongside two affiliated community medical practices (CMPs) without RhUS. We also analyzed RhUS clinic records on referral indication, procedures, results, and follow-up treatment changes. Pre- and post-RhUS visit patient surveys and referring physician (RP) surveys assessed experience and impact of the RhUS clinic.From 2018 to 2021, referrals to the RhUS clinic substantially increased. In parallel, XR and MRI orders changed by -76 % and -43 % respectively, compared with 163 % and -24 % at CMPs. Discordance between RP pre-RhUS assessments and RhUS results were common. Patient surveys showed RhUS led to increased disease understanding and impacted thoughts and decisions about their therapy. RPs found utility in RhUS across a range of indications and were confident with RhUS results.These findings suggest a dedicated RhUS clinic can be a valuable resource in clinical rheumatology practice. Implementation of a RhUS clinic at this AMC spurred rapid adoption of RhUS into clinical decision-making with notable benefits for patients and physicians alike. This may serve as a model for implementation of similar clinics at other institutions.

    View details for DOI 10.1016/j.semarthrit.2023.152276

    View details for PubMedID 37857047

  • The Role of Imaging in Diagnosis and Monitoring of Large Vessel Vasculitis. Rheumatic diseases clinics of North America Horomanski, A., Forbess, L. J. 2023; 49 (3): 489-504


    Technological advances and increased recognition of the prevalence and implications of large vessel vasculitis have led to robust research into various imaging techniques. Although there is still debate about which modality to choose in specific clinical scenarios, Ultrasound, PET/CT, MRI/A, and CT/A offer complementary information regarding diagnosis, disease activity, and vascular complication monitoring. Recognition of the strengths and limitations of each technique is important for appropriate application in clinical practice.

    View details for DOI 10.1016/j.rdc.2023.03.001

    View details for PubMedID 37331729

  • The impact of treatment with avacopan on health-related quality of life in antineutrophil cytoplasmic antibody-associated vasculitis: a post-hoc analysis of data from the ADVOCATE trial LANCET RHEUMATOLOGY Strand, V., Jayne, D. W., Horomanski, A., Yue, H., Bekker, P., Merkel, P. A., ADVOCATE Study Grp 2023; 5 (8): E451-E460
  • The impact of treatment with avacopan on health-related quality of life in antineutrophil cytoplasmic antibody-associated vasculitis: a post-hoc analysis of data from the ADVOCATE trial. The Lancet. Rheumatology Strand, V., Jayne, D. R., Horomanski, A., Yue, H., Bekker, P., Merkel, P. A. 2023; 5 (8): e451-e460


    Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis is characterised by inflammation and destruction of small to medium sized blood vessels. In the previously reported ADVOCATE study, a phase 3 double-blind, double-dummy randomised controlled trial of patients with newly diagnosed or relapsing ANCA-associated vasculitis, the oral selective complement 5a receptor inhibitor avacopan was shown to be non-inferior with regard to remission induction at week 26 and superior with regard to sustained remission at week 52, compared with a prednisone taper in a standard of care regimen. In this Article, we report an in-depth analysis of prespecified and exploratory patient-reported outcomes from the ADVOCATE study, measuring health-related quality of life and health utilities.We did a post-hoc analysis of patient-reported outcome data from the ADVOCATE study (NCT02994927) of patients with newly diagnosed or relapsing ANCA-associated vasculitis. We analysed summary scores and individual domain scores for the prespecified health-related quality of life outcomes from ADVOCATE, which were evaluated at weeks 26 and 52 by use of the Medical Outcomes Survey 36-Item Short Form Health Survey (SF-36) version 2, the EuroQol 5-Dimensions 5-Levels Questionnaire (EQ-5D-5L), and the EQ-5D health utility measure, assessed in the modified intention-to-treat population. We also calculated the Short Form 6 Dimension (SF-6D) score as an additional health utility measure. We evaluated the proportion of patients who reported scores that met or exceeded minimum clinically important differences in health-related quality of life, and we compared scores to normative values (age-specific and sex-specific scores from healthy populations from the USA matched to the protocol population). We also evaluated the proportion of patients who reported scores that met or exceeded minimum important difference in health utility scores.331 patients were enrolled in the ADVOCATE trial, of whom 166 were in the avacopan group and 165 were in the prednisone standard of care group. In the avacopan group, the mean age was 61·2 years (SD 14·6), 98 (59%) of 166 patients were men, 68 (41%) were women, and 138 (83%) were White; in the prednisone group, the mean age was 60·5 years (14·5), 88 (54%) of 164 patients were men, 76 (46%) were women, and 140 (85%) were White. Patients treated with avacopan received approximately 2500 mg less median total prednisone up to week 52. Least squares means difference from baseline in physical component summary scores were significantly greater in patients in the avacopan group compared with those in the prednisone group at weeks 26 and 52, as well as in five of eight SF-36 domains at week 26 and two of eight SF-36 domains at week 52. The proportion of patients reporting scores equal to or greater than normative values was higher in the avacopan group than in the prednisone group across all SF-36 domains at both week 26 and 52, although the differences were not statistically significant with the exception of the role physical and vitality domains at week 26. Least squares means change from baseline in EQ-5D-5L visual analogue scale, EQ-5D health utility scores, and SF-6D health utility scores were significantly greater at week 52 in the avacopan group compared with the prednisone group.Patients with ANCA-associated vasculitis who received avacopan reported statistically significant and clinically meaningful improvements in health-related quality of life at 26 and 52 weeks and in health utility EQ-5D and SF-6D scores at 52 weeks. These patient-reported outcomes complement investigator assessments and support the efficacy of avacopan in patients with ANCA-associated vasculitis with use of lower prednisone doses.ChemoCentryx.

    View details for DOI 10.1016/S2665-9913(23)00092-9

    View details for PubMedID 38251577

  • A double-blind, placebo-controlled, randomized withdrawal trial of sarilumab for the treatment of glucocorticoid-dependent sarcoidosis. Rheumatology (Oxford, England) Baker, M. C., Horomanski, A., Wang, Y., Yuhan, L., Parsafar, S., Fairchild, R., Mooney, J. J., Raj, R., Witteles, R., Genovese, M. C. 2023


    Effective steroid-sparing therapies for the treatment of sarcoidosis are lacking; interleukin-6 (IL-6) antagonists may reduce sarcoidosis disease activity. This study assessed the safety and efficacy of the IL-6 receptor antagonist, sarilumab, in subjects with glucocorticoid-dependent sarcoidosis.This phase II, double-blind, placebo-controlled, randomized withdrawal trial enrolled 15 subjects with biopsy-proven sarcoidosis at Stanford University from November 2019 to September 2022. In Period 1, subjects were treated with open-label sarilumab 200mg subcutaneously every two weeks for 16 weeks, with predefined tapering of prednisone. Subjects who completed Period 1 without a sarcoidosis flare entered Period 2 and were randomized to continue sarilumab or to receive matching placebo for 12 weeks. Endpoints included flare-free survival, as well as changes in pulmonary function tests, chest imaging, patient reported outcomes, and laboratory values.Fifteen subjects were enrolled in the study (median age 57 years, 80% male, 73.3% White), and 10 subjects successfully completed Period 1. During Period 1, 4 of 15 subjects (26.7%) discontinued due to worsening of their sarcoidosis, and CT chest imaging worsened in 5 of 15 subjects (35.7%). During Period 2, 0 of 2 subjects in the sarilumab group and 1 of 8 subjects (12.5%) in the placebo group had a flare. Treatment with sarilumab 200 mg was generally well tolerated in subjects with sarcoidosis.In this double-blind, placebo-controlled, randomized withdrawal trial, a meaningful signal for improvement in subjects with sarcoidosis treated with sarilumab was not observed. Given the small numbers in this study, no definitive conclusions can be Identifier: NCT04008069.

    View details for DOI 10.1093/rheumatology/kead373

    View details for PubMedID 37471590

  • Biologics Initiation in Rheumatoid Arthritis by Race and Ethnicity: Results From a Randomized Survey Study. ACR open rheumatology Simard, J. F., Lu, R., Falasinnu, T. O., Baker, M. C., Hawa, S., Deluna, M. D., Horomanski, A., Fairchild, R. M. 2023


    To investigate whether the race and ethnicity of a patient with rheumatoid arthritis (RA) influences rheumatologists' likelihood of choosing to initiate biologic disease-modifying antirheumatic drug (bDMARD) treatment.We conducted a randomized survey experiment in which identical brief case vignettes of hypothetical patients with RA were sent to US rheumatologists (respondents). Three of the four cases included some level of treatment decision ambiguity whereas the fourth case strongly favored bDMARD initiation. Each respondent was shown the four case vignettes, with the race and ethnicity (Black, Hispanic, White) randomly assigned for each case. Each vignette offered multiple choices for next therapeutic step, which we summarized using frequencies and proportions by race and ethnicity version.Among 159 US rheumatologists, we found that for the three cases with some level of treatment decision ambiguity, there was little to no variability in the proportions of respondents who chose to start a biologic for the Black and Hispanic variants (cases 1, 2, and 3). For case 4, respondents generally agreed to start a biologic with some minimal variability across the variants (92.6% for the Black version, 98.1% for the Hispanic version, and 96.2% for the White version).There are conflicting data regarding bDMARD use and initiation in patients with RA based on the sex and race of the patient. This work adds to this conversation by examining how the next therapeutic step chosen by rheumatologists varied by the race and ethnicity of the hypothetical patient.

    View details for DOI 10.1002/acr2.11573

    View details for PubMedID 37312437

  • Myalgic Encephalomyelitis/Chronic Fatigue Syndrome is common in post-acute sequelae of SARS-CoV-2 infection (PASC): Results from a post-COVID-19 multidisciplinary clinic. Frontiers in neurology Bonilla, H., Quach, T. C., Tiwari, A., Bonilla, A. E., Miglis, M., Yang, P. C., Eggert, L. E., Sharifi, H., Horomanski, A., Subramanian, A., Smirnoff, L., Simpson, N., Halawi, H., Sum-Ping, O., Kalinowski, A., Patel, Z. M., Shafer, R. W., Geng, L. C. 2023; 14: 1090747


    The global prevalence of PASC is estimated to be present in 0·43 and based on the WHO estimation of 470 million worldwide COVID-19 infections, corresponds to around 200 million people experiencing long COVID symptoms. Despite this, its clinical features are not well-defined.We collected retrospective data from 140 patients with PASC in a post-COVID-19 clinic on demographics, risk factors, illness severity (graded as one-mild to five-severe), functional status, and 29 symptoms and principal component symptoms cluster analysis. The Institute of Medicine (IOM) 2015 criteria were used to determine the Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) phenotype.The median age was 47 years, 59.0% were female; 49.3% White, 17.2% Hispanic, 14.9% Asian, and 6.7% Black. Only 12.7% required hospitalization. Seventy-two (53.5%) patients had no known comorbid conditions. Forty-five (33.9%) were significantly debilitated. The median duration of symptoms was 285.5 days, and the number of symptoms was 12. The most common symptoms were fatigue (86.5%), post-exertional malaise (82.8%), brain fog (81.2%), unrefreshing sleep (76.7%), and lethargy (74.6%). Forty-three percent fit the criteria for ME/CFS, majority were female, and obesity (BMI > 30 Kg/m2) (P = 0.00377895) and worse functional status (P = 0.0110474) were significantly associated with ME/CFS.Most PASC patients evaluated at our clinic had no comorbid condition and were not hospitalized for acute COVID-19. One-third of patients experienced a severe decline in their functional status. About 43% had the ME/CFS subtype.

    View details for DOI 10.3389/fneur.2023.1090747

    View details for PubMedID 36908615

    View details for PubMedCentralID PMC9998690

  • A change of heart. Journal of hospital medicine Wang, S. X., Horomanski, A., Tooley, J. E., Reejhsinghani, R., White, A. A. 2022

    View details for DOI 10.1002/jhm.13016

    View details for PubMedID 36479928

  • Increased Risk of Preterm Delivery Phenotypes and Hypertensive Disorders of Pregnancy in First Deliveries of Patients with Systemic Vasculitis Horomanski, A., Shaw, G., Mayo, J., Simard, J. WILEY. 2022: 1880-1881
  • Response letter to the editor. Seminars in arthritis and rheumatism Fairchild, R., Horomanski, A. 2021

    View details for DOI 10.1016/j.semarthrit.2021.07.019

    View details for PubMedID 34404512

  • Ultrasound evaluation of the hands and wrists in patients with systemic sclerosis: Osteophytosis is a major contributor to tender joints. Seminars in arthritis and rheumatism Fairchild, R., Horomanski, A., Sharpless, L., Chung, M., Li, S., Hong, J., Sheth, K., Chung, L. 2021; 51 (4): 735-740


    OBJECTIVE: To evaluate the prevalence and clinical associations of ultrasound (US) findings of inflammatory arthritis and joint and soft tissue pathology in patients with systemic sclerosis (SSc).METHODS: The hands and wrists of 43 SSc patients and 35 age-balanced controls were evaluated by clinical exam and musculoskeletal US. Synovial and tenosynovial pathology were assessed using semi-quantitative Gray Scale (GS) and Power Doppler (PD) scoring. US evaluation for osteophytes, erosions, ulnar artery occlusion, and median nerve cross-sectional areas was performed. Tender joints (TJ), swollen joints (SJ), modified Rodnan skin score (mRSS), digital ulcers, contractures, and calcinosis were evaluated. Concordance between US and physical exam findings at each joint region were assessed, and associations between their severity were analyzed.RESULTS: TJs and SJs were present in 44.2% and 62.8% of SSc patients, respectively. Inflammatory arthritis, defined as having both GS>0 and PD>0, was observed in 18.6% of SSc patients and no controls. There was a high concordance by joint region between GS synovial hypertrophy and osteophytes (kappa=0.88) as well as TJs (kappa=0.72). SSc patients had more osteophytes compared to controls (48.8% vs 22.9%, p=0.018) as well as higher osteophyte severity (p=0.033).CONCLUSIONS: Despite a high percentage of tender and swollen joints, less than 20% of SSc patients met criteria for inflammatory arthritis on US. The high concordance of osteophytes with GS synovial hypertrophy and tender joints suggest that osteophytosis may be a significant contributor to joint pain in SSc patients.

    View details for DOI 10.1016/j.semarthrit.2021.04.020

    View details for PubMedID 34144383

  • Prevalence and significance of pulmonary disease on lung ultrasonography in outpatients with SARS-CoV-2 infection. BMJ open respiratory research Fairchild, R. M., Horomanski, A., Mar, D. A., Triant, G. R., Lu, R., Lu, D., Guo, H. H., Baker, M. C. 2021; 8 (1)


    The majority of patients with SARS-CoV-2 infection are diagnosed and managed as outpatients; however, little is known about the burden of pulmonary disease in this setting. Lung ultrasound (LUS) is a convenient tool for detection of COVID-19 pneumonia. Identifying SARS-CoV-2 infected outpatients with pulmonary disease may be important for early risk stratification.To investigate the prevalence, natural history and clinical significance of pulmonary disease in outpatients with SARS-CoV-2.SARS-CoV-2 PCR positive outpatients (CV(+)) were assessed with LUS to identify the presence of interstitial pneumonia. Studies were considered positive based on the presence of B-lines, pleural irregularity and consolidations. A subset of patients underwent longitudinal examinations. Correlations between LUS findings and patient symptoms, demographics, comorbidities and clinical outcomes over 8 weeks were evaluated.102 CV(+) patients underwent LUS with 42 (41%) demonstrating pulmonary involvement. Baseline LUS severity scores correlated with shortness of breath on multivariate analysis. Of the CV(+) patients followed longitudinally, a majority showed improvement or resolution in LUS findings after 1-2 weeks. Only one patient in the CV(+) cohort was briefly hospitalised, and no patient died or required mechanical ventilation.We found a high prevalence of LUS findings in outpatients with SARS-CoV-2 infection. Given the pervasiveness of pulmonary disease across a broad spectrum of LUS severity scores and lack of adverse outcomes, our findings suggest that LUS may not be a useful as a risk stratification tool in SARS-CoV-2 in the general outpatient population.

    View details for DOI 10.1136/bmjresp-2021-000947

    View details for PubMedID 34385149

    View details for PubMedCentralID PMC8361701

  • Barriers to Influenza Vaccination in Patients at a Tertiary Care Rheumatology Clinic Horomanski, A., Triant, G., Kolstad, K., Dymock, M., Lin, J. WILEY. 2020
  • Painful Panniculitis and Polyarthritis in Pancreatic Adenocarcinoma: A Case Report. Journal of clinical rheumatology : practical reports on rheumatic & musculoskeletal diseases Ku, S. n., Balijepally, R. n., Horomanski, A. n., Fairchild, R. n., Brown, R. A., Liao, C. E. 2020

    View details for DOI 10.1097/RHU.0000000000001408

    View details for PubMedID 32496359

  • Deciding which way to go: how do insects alter movements to negotiate barriers? Frontiers in neuroscience Ritzmann, R. E., Harley, C. M., Daltorio, K. A., Tietz, B. R., Pollack, A. J., Bender, J. A., Guo, P., Horomanski, A. L., Kathman, N. D., Nieuwoudt, C., Brown, A. E., Quinn, R. D. 2012; 6: 97


    Animals must routinely deal with barriers as they move through their natural environment. These challenges require directed changes in leg movements and posture performed in the context of ever changing internal and external conditions. In particular, cockroaches use a combination of tactile and visual information to evaluate objects in their path in order to effectively guide their movements in complex terrain. When encountering a large block, the insect uses its antennae to evaluate the object's height then rears upward accordingly before climbing. A shelf presents a choice between climbing and tunneling that depends on how the antennae strike the shelf; tapping from above yields climbing, while tapping from below causes tunneling. However, ambient light conditions detected by the ocelli can bias that decision. Similarly, in a T-maze turning is determined by antennal contact but influenced by visual cues. These multi-sensory behaviors led us to look at the central complex as a center for sensori-motor integration within the insect brain. Visual and antennal tactile cues are processed within the central complex and, in tethered preparations, several central complex units changed firing rates in tandem with or prior to altered step frequency or turning, while stimulation through the implanted electrodes evoked these same behavioral changes. To further test for a central complex role in these decisions, we examined behavioral effects of brain lesions. Electrolytic lesions in restricted regions of the central complex generated site specific behavioral deficits. Similar changes were also found in reversible effects of procaine injections in the brain. Finally, we are examining these kinds of decisions made in a large arena that more closely matches the conditions under which cockroaches forage. Overall, our studies suggest that CC circuits may indeed influence the descending commands associated with navigational decisions, thereby making them more context dependent.

    View details for DOI 10.3389/fnins.2012.00097

    View details for PubMedID 22783160

    View details for PubMedCentralID PMC3390555