Cited by 94Cardiovascular Syncope and Autonomic DisordersAutoimmune Neurological Disorders and TreatmentsMyasthenia Gravis and Thymoma

Autoimmune postural orthostatic tachycardia syndrome

Open access
Watari, Mari, Nakane, Shunya, Mukaino, Akihiro, Nakajima, Makoto, Mori, Yukiko, Maeda, Yasuhiro, Masuda, Teruaki, Takamatsu, Koutaro +4 more·2018·Annals of Clinical and Translational Neurology

Abstract

The aim of this study was to evaluate the association between postural orthostatic tachycardia syndrome (POTS) and circulating antiganglionic acetylcholine receptor (gAChR) antibodies. We reviewed clinical assessments of Japanese patients with POTS, and determined the presence of gAChR antibodies in serum samples from those patients. Luciferase immunoprecipitation systems detected anti‐gAChRα 3 and β 4 antibodies in the sera from POTS (29%). Antecedent infections were frequently reported in patients in POTS patients. Moreover, autoimmune markers and comorbid autoimmune diseases were also frequent in seropositive POTS patients. Anti‐gAChR antibodies were detectable in significant number of patients with POTS, and POTS entailed the element of autoimmune basis.

AI snapshot

Written from the paper’s full text.

TL;DR

In Japanese patients with POTS, anti-ganglionic acetylcholine receptor antibodies were detected in 29% (10/34), more frequently than in NMS or controls, and seropositive POTS patients more often had autoimmune markers and comorbid autoimmune diseases. The authors conclude POTS may have an autoimmune basis, while noting the observational design and small sample size.

Key findings

  • Anti-gAChR antibodies were detected in 29% (10 of 34) of POTS patients: anti-gAChRa3 in 8 (24%) and anti-gAChRb4 in 2 (6%); no seropositive POTS sample was positive for both. In NMS, 1 of 19 (5%) was positive for anti-gAChRa3; all 73 healthy controls were negative, and 1 OND patient with suspected amyloid neuropathy had anti-gAChRa3 antibodies.
  • Mean antibody index for anti-gAChRa3 was 0.746 in POTS versus 0.305 in HC and 0.336 in OND (P < 0.001); for anti-gAChRb4 it was 0.536 in POTS versus 0.367 in HC and 0.302 in OND (P = 0.007). POTS versus NMS showed no significant difference in antibody prevalence (P = 0.479) or mean A.I. for anti-gAChRa3 and anti-gAChRb4 (P = 0.774 and 0.744).
  • Compared with NMS, POTS patients were younger at assessment and onset (P = 0.004 and 0.013), more often female (24/34, 71% vs 7/19, 37%; P = 0.018), and more often reported antecedent infections (10/34, 29%; P = 0.010).
  • Among POTS patients, seropositive patients were older (P = 0.012); antecedent infections were reported in 5/10 (50%) seropositive patients with no difference by serostatus; pupil abnormality and lower gastrointestinal symptoms were more frequent (P = 0.029 and 0.032), and other autoimmune diseases were more common (P < 0.001). IVMP was given to 3/10 seropositive patients, all with clinical improvement; 4/24 seronegative patients received IVMP, with 3 maintaining improvement in orthostatic intolerance and 1 showing no clinical improvement.

Methods

  • The study reviewed Japanese patients with orthostatic intolerance; serum samples from 53 patients were obtained from general and teaching hospitals throughout Japan between January 2012 and August 2016. First analysis compared 34 POTS, 19 NMS, 34 OND, and 73 healthy controls; second analysis compared seropositive and seronegative POTS patients.
  • Anti-gAChRa3 and anti-gAChRb4 antibodies were detected by luciferase immunoprecipitation system (LIPS) assays, expressed as antibody index (A.I.), with healthy control values normalized as <1.000 A.I. Clinical, neurological, and serologic assessments were performed, and questionnaires were sent to referring neurologists.
  • Statistical analysis used SigmaPlot; normally distributed A.I. data were analyzed by one-way analysis of variance, and frequencies/non-normally distributed data by one-way analyses of variance of ranks; P < 0.05 was considered significant.

Limitations

  • Stated: the study is limited by an observational design and small sample size; the authors state that a prospective, multicenter, clinical interventional study is necessary to confirm relationships between anti-gAChR antibody levels and POTS/autonomic symptom severity and the potential for immunotherapy.
  • Stated: the majority of seropositive samples did not have high levels of autoantibodies for gAChR, so elevated antibodies to gAChR subunits may reflect secondary autoimmune responses to ganglionic neuron damage.
  • Evident from the text: the cross-sectional seroprevalence comparison cannot establish causality, and the findings derive from Japanese patients, so generalizability to other populations may be limited.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1002/acn3.524

Cites

20 of 20 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 12 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    Only one NMS patient (5%) was positive for anti-gAChRa3 antibodies.

    “only one patient (5%) with NMS was positive for autoantibodies against gAChRa3.”
    Quote in the paperSubstantial claim
  • Findingown data

    Anti-gAChRa3 antibodies were detected in 8 of 34 POTS patients (24%).

    “anti-gAChRa3 antibodies were detected in 8 samples (24%)”
    Quote in the paperSubstantial claim
  • Findingown data

    In all 73 healthy controls, anti-gAChRa3 and anti-gAChRb4 antibodies were absent.

    “In all 73 HC, anti-gAChRa3 and anti-gAChRb4 antibodies were absent”
    Quote in the paperSubstantial claim
  • Findingown data

    There was no statistically significant difference between POTS and NMS in the prevalence of anti-gAChR antibodies (P = 0.479).

    “no statistically significant difference was detected in between the POTS group and NMS group on the prevalence of anti-gAChR antibodies (P = 0.479).”
    Quote in the paperNot a substantial claim
  • Findingown data

    Other autoimmune diseases were more common in anti-gAChR antibody-positive POTS patients than in antibody-negative POTS patients (P < 0.001).

    “Other autoimmune diseases were more common in anti-gAChR antibody-positive patients than in those who were antibody-negative (P < 0.001).”
    Quote in the paperSubstantial claim
  • May combine two claims. 7
  • Classified as probably not a substantial claim. 5
  • The quote only partly states this claim. 1
  • May combine two claims.

    Findingown data

    The mean anti-gAChRb4 antibody index in POTS was 0.536, significantly greater than in healthy controls (0.367) or OND (0.302) (P = 0.007).

    “The mean A.I. for anti-gAChRb4 antibodies in the POTS group was 0.536, which was also significantly greater than those obtained for the HC (0.367) or OND (0.302) groups (P = 0.007)”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    The mean anti-gAChRa3 antibody index in POTS was 0.746, significantly greater than in healthy controls (0.305) or OND (0.336) (P < 0.001).

    “The mean A.I. value for anti-gAChRa3 antibodies in the POTS group was 0.746, which was significantly greater than those obtained for the HC (0.305) or OND (0.336) groups (P < 0.001).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    The mean anti-gAChRa3 antibody index in NMS was 0.638, and the mean anti-gAChRb4 antibody index in NMS was 0.421.

    “the mean A.I. value for anti-gAChRa3 antibodies in the NMS group was 0.638, and the mean A.I. for anti-gAChRb4 antibodies in the NMS group was 0.421.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingown data

    Anti-gAChRa3 antibodies were detected in one OND patient with suspected amyloid neuropathy.

    “anti-gAChRa3 antibodies were detected in the serum of one patient in the OND group, who had suspected amyloid neuropathy”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Seropositive POTS patients demonstrated autoimmune markers and comorbid autoimmune diseases were frequent.

    “Seropositive POTS patients demonstrated autoimmune markers and comorbid autoimmune diseases were frequent.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Anti-gAChR antibodies may impair autonomic ganglionic synaptic transmission, and antibodies that interfere with ganglionic transmission may contribute to dysautonomia in patients with POTS.

    “Anti-gAChR antibodies may impair autonomic ganglionic synaptic transmission, and antibodies that interfere with ganglionic transmission may contribute to dysautonomia in patients with POTS.18”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [18] source

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Premisecitation

    Previously, the authors reported the relationship among anti-gAChR antibodies, autonomic dysfunction, and autoimmune rheumatic diseases.

    “Previously, we reported the relationship among the anti-gAChR antibodies, autonomic dysfunction, and autoimmune rheumatic diseases.[11][12][13]”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [11][12][13]

      Not checked in the free run.

  • The quote only partly states this claim.

    Study design and conductcitation

    The cut-off points for the LIPS assay were verified using all data collected in previous studies.

    “To evaluate the diagnostic accuracy of this assay, we verified the cut-off points for all data collected in the previous study.12,13”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [12] source

      Not checked in the free run.

    • cites [13]

      Not checked in the free run.

  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductnone given

    This study is limited by an observational design and small sample size.

    “This study is limited by an observational design and small sample size.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Premisecitation

    Anti-gAChR antibodies are associated with autonomic dysfunction (e.g., POTS) in autoimmune rheumatic diseases.

    “we noted the possibility that anti-gAChR antibodies are associated with autonomic dysfunction (e.g., POTS) in autoimmune rheumatic diseases.12,13”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [12] source

      Not checked in the free run.

    • cites [13]

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Premisecitation

    An autoimmune basis has been suggested as a causal mechanism of POTS.

    “An autoimmune basis has been suggested as a causal mechanism of POTS”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [5][6][7]

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Blitshteyn determined a high prevalence of positive ANA and other autoantibodies and a high prevalence of comorbid autoimmune disorders in patients with POTS.

    “Blitshteyn recently determined the high prevalence of positive ANA and other autoantibodies and the high prevalence of comorbid autoimmune disorders that exist in patients with POTS.8,9”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [8] source

      Not checked in the free run.

    • cites [9] source

      Not checked in the free run.

12 of 12
  • The paper relies on this without support.

    POTS patients in this Japanese cohort are representative of POTS patients generally.

    “We reviewed clinical assessments of Japanese patients with POTS, and determined the presence of gAChR antibodies in serum samples from those patients.”
1 of 1

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Claim of clear distinction conflicts with nonsignificant antibody-prevalence comparison

    Major

    The discussion says antibody prevalence clearly distinguished POTS from NMS, but the results report no statistically significant difference in that prevalence between the groups (P = 0.479).

1 of 1

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Watari, M., Nakane, S., Mukaino, A., Nakajima, M., Mori, Y., Maeda, Y., Masuda, T., Takamatsu, K., Kouzaki, Y., Higuchi, O., Matsuo, H., & Ando, Y.
Affiliations
  • Kumamoto University (JP)
  • Kumamoto University Hospital (JP)
  • Nagasaki Kawatana Medical Center (JP)
  • Department of Neurology Kumamoto Rosai Hospital Yatsushiro Japan
Corresponding author
Nakane, Shunya
Venue
Annals of Clinical and Translational Neurology
Publisher
Wiley
Published
2018-02-28
Volume
5
Issue
4
Pages
486-492
ISSN
2328-9503 (ISSN-L)
OpenAlex
W2790633734
Cited by
94
References
20
Citations by year
2026: 7 · 2025: 6 · 2024: 8 · 2023: 12 · 2022: 11 · 2021: 20 · 2020: 14 · 2019: 10 · 2018: 5
FWCI
12.73
Type
journal article
Language
en
Open access
Locations
  • Annals of Clinical and Translational Neurology (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology
  • Japan Society for the Promotion of Science (25461305, 16K09695)
Topics
  • Health Sciences › Medicine › Surgery › Cardiovascular Syncope and Autonomic Disorders
  • Health Sciences › Medicine › Neurology › Autoimmune Neurological Disorders and Treatments
  • Health Sciences › Medicine › Neurology › Myasthenia Gravis and Thymoma
Keywords
postural orthostatic tachycardia syndrome, autoantibodies, antecedent infection, autoimmune disease comorbidity, autoimmune markers

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-06.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-06.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review