Hematology

Daily Management & Long-Term Monitoring

At a Glance

Children with TRMA need consistent high-dose thiamine and monitoring of blood counts, blood sugar, hearing, vision, and heart rhythm. During illness, follow the sick-day plan, check glucose and ketones as instructed, and seek urgent care if medication cannot stay down or warning signs appear.

Managing Thiamine-Responsive Megaloblastic Anemia (TRMA) requires a shift from searching for a diagnosis to maintaining a sustainable daily routine. Because your child’s body has impaired cellular thiamine transport, their health depends on a consistent supply of high-dose thiamine ^[1]^[2].

The Importance of Consistent Treatment

A key rule for TRMA is that thiamine treatment should not be stopped without the prescribing team. While an isolated missed dose is not an immediate emergency, prolonged discontinuation can lead to relapse as the body’s cells run low on energy ^[2]^[3].

Stopping thiamine for an extended period can trigger:

Severe Pancytopenia: This is a dangerous drop in all types of blood cells—red cells, white cells, and platelets ^[2]. In one case, a patient developed severe pancytopenia five weeks after stopping treatment ^[2].
Diabetic Ketoacidosis (DKA): Without thiamine, the pancreas may stop producing enough insulin, leading to dangerously high blood sugar and a buildup of acid in the blood (ketosis) ^[4]^[5]. This is a medical emergency that often requires hospitalization ^[6].
Heart Rhythm Issues: TRMA is linked to electrical changes in the heart. Stopping thiamine has been shown to trigger supraventricular tachycardia (SVT)—an abnormally fast heartbeat—especially during puberty or periods of illness ^[5].

Long-Term Monitoring Schedule

Because TRMA affects multiple organs, your child will need regular “surveillance” to catch any changes early. While your doctor will set an individualized schedule based on your child’s baseline findings, standard care typically monitors:

System	What is Monitored	Why it is Checked
Hematology	Complete Blood Counts (CBC)	To ensure red blood cells remain healthy and there is no sign of returning anemia ^[7]^[8].
Endocrinology	Blood glucose and HbA1c	To track the three-month average of blood sugar ^[9]. You should also be trained on how to check for ketones if your child becomes ill ^[6].
Audiology	Hearing tests (audiograms)	Even with treatment, hearing loss can progress in some children ^[10]^[6]. If hearing loss becomes severe, your team may discuss cochlear implants, which have been used successfully in TRMA patients ^[11]^[4].
Ophthalmology	Dilated eye exams	Routine exams check for changes in the retina (retinitis pigmentosa) or the optic nerve (optic atrophy) ^[12]^[13].
Cardiology	Electrocardiograms (ECG)	Used to monitor the heart’s rhythm. Some TRMA patients have a variable finding called “absent P-waves” on their ECG, which requires specialized monitoring to manage the risk of arrhythmias ^[5]^[14].

Sick Day Management

When a child with TRMA gets a fever, a stomach bug, or a common infection, illness can increase metabolic and diabetes-related risk ^[6]. During these times, the risk of blood sugar spikes or DKA increases ^[15]. Oral doses should not be changed or doubled. Strict adherence to the prescribed thiamine protocol and checking glucose/ketones is most important when your child is sick. Do not stop prescribed insulin without endocrinology advice.

If your child is vomiting and cannot keep their medication down, you must contact your medical team immediately for an alternative route, or seek emergency assessment ^[2].

When to seek urgent care: Go to the ER if your child experiences fainting, sustained palpitations, severe lethargy, rapid/deep breathing, unusual bleeding, severe abdominal pain, confusion, or an inability to keep medication down.

By maintaining a consistent routine and keeping up with individualized specialist appointments, you can help ensure that the “doorway” to energy remains open for your child ^[16].

Common questions in this guide

Is one missed thiamine dose an emergency for a child with TRMA?

A single missed dose is not usually an immediate emergency, but contact the prescribing team for instructions and do not change or double doses on your own. Prolonged interruption can cause a dangerous drop in blood cells, severe high blood sugar with acid buildup, or a fast abnormal heart rhythm.

What tests does my child need for long-term TRMA monitoring?

Monitoring usually includes complete blood counts, blood glucose, a blood test called HbA1c that reflects average glucose over about three months, hearing tests, dilated eye exams, and ECGs. Ask the care team when to check ketones, especially when your child is ill, because the schedule should be individualized.

What should we do when a child with TRMA becomes sick?

Continue prescribed thiamine as directed when your child can take it, and do not change or double oral doses. Check glucose and ketones according to the sick-day plan, do not stop prescribed insulin without endocrinology advice, and contact the medical team if vomiting prevents medication from staying down.

When should a child with TRMA receive emergency care?

Seek emergency care for fainting, sustained palpitations, severe lethargy, rapid or deep breathing, unusual bleeding, severe abdominal pain, confusion, or inability to keep medication down. These signs can indicate a serious heart, blood, or metabolic problem and should not wait for a routine appointment.

Can hearing loss get worse even when my child takes thiamine?

Yes. Hearing loss can progress in some children despite thiamine treatment, so regular formal hearing tests are important. If hearing loss becomes severe, the care team may discuss cochlear implants.

Why does my child need regular ECGs with TRMA?

ECGs monitor the heart’s electrical rhythm and can identify findings such as absent P-waves that may require specialized follow-up. Supraventricular tachycardia risk can increase during illness or puberty, so ask the cardiology team how often testing is needed.

Get notified when new evidence is published on Thiamine-responsive megaloblastic anemia syndrome.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.

Key takeaways

Prolonged interruption of prescribed thiamine can lead to pancytopenia, diabetic ketoacidosis with dangerous blood sugar and acid buildup, or abnormal fast heart rhythms.
Regular follow-up typically includes complete blood counts, blood glucose and HbA1c, hearing tests, dilated eye exams, and ECGs.
Hearing loss can progress despite thiamine treatment, so ongoing audiology follow-up is important and cochlear implants may be considered for severe loss.
During illness, follow the prescribed thiamine and insulin plan, do not double oral doses or stop insulin without endocrinology advice, and contact the care team if vomiting prevents medication intake.
Seek urgent care for fainting, sustained palpitations, severe lethargy, rapid or deep breathing, unusual bleeding, severe abdominal pain, confusion, or inability to keep medication down.

References (16)

1
[Thiamine-responsive megaloblastic anemia or Rogers syndrome: A literature review].
Lu H, Lu H, Vaucher J, et al.
La Revue de medecine interne 2019; (40(1)):20-27 doi:10.1016/j.revmed.2018.06.005.
PMID: 30031565
2
Pancytopenia in an adult patient with thiamine-responsive megaloblastic anaemia.
Moulin V, Grandoni F, Castioni J, Lu H
BMJ case reports 2018; (2018()) doi:10.1136/bcr-2018-225035.
PMID: 29903777
3
Relapse of rare diseases during COVID-19 pandemic: bicytopenia in an adult patient with thiamine-responsive megaloblastic anaemia.
Nouira N, Mansouri R, Tlili R, et al.
The Pan African medical journal 2020; (35(Suppl 2)):139 doi:10.11604/pamj.supp.2020.35.139.25368.
PMID: 33193954
4
Childhood thiamine-responsive megaloblastic anemia and diabetes: a case series highlighting early diagnosis and management.
Yılmaz UC, Bhriguvanshi A, Özalp Kızılay D, et al.
Journal of pediatric endocrinology & metabolism : JPEM 2026; (39(7)):733-740 doi:10.1515/jpem-2025-0670.
PMID: 41626659
5
Arrhythmia in thiamine responsive megaloblastic anemia syndrome.
Argun M, Baykan A, Hatipoğlu N, et al.
The Turkish journal of pediatrics 2018; (60(3)):348-351.
PMID: 30511554
6
First 2 cases with thiamine-responsive megaloblastic anemia in the Czech Republic, a rare form of monogenic diabetes mellitus: a novel mutation in the thiamine transporter SLC19A2 gene-intron 1 mutation c.204+2T>G.
Pomahačová R, Zamboryová J, Sýkora J, et al.
Pediatric diabetes 2017; (18(8)):844-847 doi:10.1111/pedi.12479.
PMID: 28004468
7
Case Report: Genetic and Clinical Features of Maternal Uniparental Isodisomy-Induced Thiamine-Responsive Megaloblastic Anemia Syndrome.
Kang P, Zhang W, Wen J, et al.
Frontiers in pediatrics 2021; (9()):630329 doi:10.3389/fped.2021.630329.
PMID: 33816400
8
Pharmacogenomics in diabetes: outcomes of thiamine therapy in TRMA syndrome.
Habeb AM, Flanagan SE, Zulali MA, et al.
Diabetologia 2018; (61(5)):1027-1036 doi:10.1007/s00125-018-4554-x.
PMID: 29450569
9
Thiamine-Responsive Megaloblastic Anemia-Related Diabetes: Long-Term Clinical Outcomes in 23 Pediatric Patients From the DPV and SWEET Registries.
Warncke K, Prinz N, Iotova V, et al.
Canadian journal of diabetes 2021; (45(6)):539-545 doi:10.1016/j.jcjd.2020.11.006.
PMID: 33388275
10
Early thiamine therapy in Rogers syndrome: Systematic review of hematologic, auditory and glycemic outcomes.
Upadhyay Z, Sudani S, Jain A
Bioinformation 2026; (22(1)):26-30 doi:10.6026/973206300220026.
PMID: 41960466
11
Thiamine responsive megaloblastic Anemia and deafness: A rare case of Roger's syndrome with successful hearing rehabilitation by cochlear implantation.
Marfatia H, Sahai A, Narkhede K, Sharma M
Journal of otology 2024; (19(3)):163-165 doi:10.1016/j.joto.2024.05.001.
PMID: 39735239
12
Leber congenital amaurosis as an initial manifestation in a Chinese patient with thiamine-responsive megaloblastic anemia syndrome.
Wu S, Yuan Z, Sun Z, et al.
American journal of medical genetics. Part A 2022; (188(3)):948-952 doi:10.1002/ajmg.a.62582.
PMID: 34821467
13
LONG-TERM MULTIMODAL IMAGING OF OCULAR FINDINGS ASSOCIATED WITH THIAMINE-RESPONSIVE MEGALOBLASTIC ANEMIA.
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14
An extremely rare case of Rogers syndrome or thiamine responsive megaloblastic anemia.
Kaur G, Ahuja A, Sen A, et al.
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PMID: 38391342
15
Beta cell function and clinical course in three siblings with thiamine-responsive megaloblastic anemia (TRMA) treated with thiamine supplementation.
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Journal of pediatric endocrinology & metabolism : JPEM 2017; (30(2)):241-246.
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16
Survey of patient satisfaction with genetic counseling services in Korea.
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PMID: 38769825

This page is for informational purposes only and does not constitute medical advice. Your child’s metabolic, hematology, endocrinology, and other specialist teams should provide the individualized plan, including any medication changes.