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Aplastic anemia — Clinical Guidelines

Overview

Aplastic anemia (AA) is a rare hematologic disorder characterized by bone marrow failure leading to pancytopenia and hypocellular bone marrow. It can be idiopathic or drug-induced, with severe cases often requiring intensive treatment approaches such as hematopoietic stem cell transplantation (HSCT) or immunosuppressive therapy (IST). 3 1 2

Diagnosis

Key Criteria: Pancytopenia with hypocellular bone marrow.

Exclusion: Rule out other causes like hypoplastic myelodysplastic syndromes.

Molecular Analysis: Use molecular cytogenetics to differentiate immune-mediated AA from inherited bone marrow failure syndromes.

Severity Assessment: Utilize Camitta criteria for disease severity grading. 3

Management

First-Line Treatment:

- Immunosuppressive Therapy (IST): Anti-thymocyte globulin (ATG) is preferred over antilymphocyte globulin (ALG) for severe AA. 10 - Doses: Specific dosing details vary; consult institutional protocols.

Adjunctive Treatments:

- Hematopoietic Stem Cell Transplantation (HSCT): Recommended for severe AA, especially in younger patients with a matched sibling donor (MSD). 4 5 - Haploidentical Transplantation: Considered an alternative when MSD is unavailable, with outcomes comparable to matched unrelated donor (MUD) transplants. 6

Other Therapies:

- Erythropoietin: May show trilineage response in steroid-resistant cases. 15 - Supportive Care: Essential for managing complications like infections. 8

Special Populations

Pediatrics: HSCT from MSD is first-line for severe AA; IST is considered if transplantation is not feasible. 5

Elderly: Consideration of HSCT should weigh age-related risks and comorbidities. 4

Comorbidities: Presence of PNH clone before treatment may influence prognosis with IST, though evidence is mixed. 7

Key Recommendations

Severe Aplastic Anemia (SAA) in Adults: Allogeneic HSCT from a matched sibling donor should be prioritized if available, with IST as an alternative for non-transplant candidates. (Evidence: Strong 4)

Immunosuppressive Therapy: Anti-thymocyte globulin (ATG) is recommended over other immunosuppressive agents for treating SAA. (Evidence: Strong 10)

Haploidentical Transplantation: Consider as a viable option when matched unrelated donors are unavailable, given comparable outcomes to MUD transplants. (Evidence: Moderate 6)

PNH Clone Presence: Pre-treatment PNH clone detection should guide treatment decisions but lacks definitive prognostic impact due to conflicting evidence. (Evidence: Weak 7)

Supportive Care: Essential for managing infections and other complications in AA patients undergoing treatment. (Evidence: Expert opinion 8)

References

1 Ohyama K, Katagiri S, Takahashi S, Ayuhara H, Takeuchi H, Akahane D et al.. Aplastic anemia associated with osimertinib: Analysis of the FDA adverse event reporting system. International journal of clinical pharmacology and therapeutics 2025. link 2 Zhang F, Wang P, Liu X, Chen Y, Yang J. Pharmacovigilance assessment of drug-induced aplastic anemia: analysis of the FDA adverse event reporting system. International journal of clinical pharmacy 2025. link 3 Kulasekararaj A, Cavenagh J, Dokal I, Foukaneli T, Gandhi S, Garg M et al.. Guidelines for the diagnosis and management of adult aplastic anaemia: A British Society for Haematology Guideline. British journal of haematology 2024. link 4 Iftikhar R, DeFilipp Z, DeZern AE, Pulsipher MA, Bejanyan N, Burroughs LM et al.. Allogeneic Hematopoietic Cell Transplantation for the Treatment of Severe Aplastic Anemia: Evidence-Based Guidelines From the American Society for Transplantation and Cellular Therapy. Transplantation and cellular therapy 2024. link 5 Guarina A, Farruggia P, Mariani E, Saracco P, Barone A, Onofrillo D et al.. Diagnosis and management of acquired aplastic anemia in childhood. Guidelines from the Marrow Failure Study Group of the Pediatric Haemato-Oncology Italian Association (AIEOP). Blood cells, molecules & diseases 2024. link 6 Zhao J, Ma L, Zheng M, Su L, Guo X. Meta-analysis of the results of haploidentical transplantation in the treatment of aplastic anemia. Annals of hematology 2023. link 7 Li J, Li X, Cai L, Peng X, Yao M, Li S et al.. Prognostic value of pre-treatment PNH clone among the patients with aplastic anemia: a meta-analysis. Hematology (Amsterdam, Netherlands) 2023. link 8 Abdolrasouli A, Schelenz S. Answer to the Photo Quiz: Bloodstream infection in a neutropenic patient with severe aplastic anemia. Journal of clinical microbiology 2023. link 9 Calado RT. The future of aplastic anemia treatment in Brazil: Lessons learned for global hematology. Seminars in hematology 2023. link 10 Siddiqui S, Cox J, Herzig R, Palaniyandi S, Hildebrandt GC, Munker R. Anti-thymocyte globulin in haematology: Recent developments. The Indian journal of medical research 2019. link 11 Rawlinson NJ, Fung B, Gross TG, Termuhlen AM, Skeens M, Garee A et al.. Disseminated Rhizomucor pusillus causing early multiorgan failure during hematopoietic stem cell transplantation for severe aplastic anemia. Journal of pediatric hematology/oncology 2011. link 12 Goto H, Ishida A, Fujii H, Kuroki F, Takahashi H, Ikuta K et al.. Successful bone marrow transplantation for severe aplastic anemia in a patient with persistent human parvovirus B19 infection. International journal of hematology 2004. link 13 Deeg HJ, Amylon ID, Harris RE, Collins R, Beatty PG, Feig S et al.. Marrow transplants from unrelated donors for patients with aplastic anemia: minimum effective dose of total body irradiation. Biology of blood and marrow transplantation : journal of the American Society for Blood and Marrow Transplantation 2001. link 14 Kaufman DW, Kelly JP, Anderson T, Harmon DC, Shapiro S. Evaluation of case reports of aplastic anemia among patients treated with felbamate. Epilepsia 1997. link 15 Bernell P. Aplastic anaemia with a trilineage response to erythropoietin therapy. Journal of internal medicine 1996. link 16 de Silva HJ, de Mel WC, Kularatne WN. Aplastic anaemia complicating hepatitis A virus infection. The Ceylon medical journal 1993. link 17 Luker J, Scully C, Oakhill A. Gingival swelling as a manifestation of aplastic anemia. Oral surgery, oral medicine, and oral pathology 1991. link90521-d) 18 Gordon-Smith EC. Aplastic anaemia--aetiology and clinical features. Bailliere's clinical haematology 1989. link80004-6) 19 Cameron ES, Alleyne W, Charles W. Fanconi's aplastic anaemia in two sisters in Trinidad and Tobago. The West Indian medical journal 1989. link 20 Dohlsten M, Carlsson R, Hedlund G, Sjögren HO, Bekassy AN, Garwicz S. Immunological abnormalities in a child with constitutional aplastic anemia. Pediatric hematology and oncology 1986. link 21 Sandberg T, Lindquist O, Norkrans G. Fatal aplastic anaemia associated with non-A, non-B hepatitis. Scandinavian journal of infectious diseases 1984. link 22 Foster PN, Kelsey PR. Aplastic anaemia and polyneuropathy. Acta haematologica 1983. link 23 Alavi JB. Aplastic anemia associated with intravenous chloramphenicol. American journal of hematology 1983. link 24 Lowenthal MN, Jones IG, Desai M. Aplastic anaemia and optic fundus haemorrhages due to traditional herbal remedies. The Journal of tropical medicine and hygiene 1978. link 25 Watananukul P, Israsena S, Dechakaisaya S. Aplastic anemia associated with submassive hepatic necrosis. Report of four cases. Archives of internal medicine 1977. link 26 Geraedts JP, Haak HL. Trisomy 6 associated with aplastic anemia. Human genetics 1976. link

Aplastic anemia