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Living with Chronic atrial and intestinal dysrhythmia

A rare genetic condition that affects both the heart rhythm and the way the intestines move food along.

Understanding Chronic atrial and intestinal dysrhythmia

Chronic atrial and intestinal dysrhythmia (CAID) is a disorder that affects the heart and the digestive system.

It disrupts the heart's rhythm, causing sick sinus syndrome, a problem with the heart's natural pacemaker. It also disrupts the muscle contractions that move food through the intestines, causing intestinal pseudo-obstruction. The heart and digestive problems develop at the same time, usually by age 20.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Sick sinus syndrome (heart rhythm problem)
  • Slow heartbeat (bradycardia)
  • Intestinal pseudo-obstruction
  • Slow weight gain or low weight
  • Enlarged left upper heart chamber

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include digestive system specialists, genetic specialists and heart and blood vessel specialists.

  3. Consider genetic testing

    Changes in SGO1 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Association of Gastrointestinal Motility Disorders may keep lists of experts for this condition.

Care & treatment

Care team
Digestive system specialists (gastroenterologists); Genetic specialists (geneticists); Heart and blood vessel specialists (cardiologists)
Expert care
Expert lists: Association of Gastrointestinal Motility Disorders
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Association of Gastrointestinal Motility Disorders
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Can SGO1 genetic testing confirm the diagnosis?
How should my heart rhythm be monitored?
Which specialists should manage the digestive symptoms?

Quick facts

Symptoms usually startfrom Childhood to Adulthood
InheritanceAutosomal Recessive
GenesSGO1

GARD says changes in the SGO1 gene cause this condition. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

GeneticGastrointestinal

Also known as: caid; caid (chronic atrial and intestinal dysrhythmia) syndrome; caid syndrome; chronic atrial and intestinal dysrhythmia syndrome; chronic atrial dysrhythmia-intestinal motility disorder

Patient organizations

Source: NIH GARD · Chronic atrial and intestinal dysrhythmiaGARD ID 12281 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Chronic atrial and intestinal dysrhythmia.

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