Dysphagia Knowledge Hub — 吞嚥困難知識庫

Scleroderma and Esophageal Dysphagia: GERD, Motility, Positioning, and Small Meal Management

TL;DR: Scleroderma (systemic sclerosis) causes dysphagia through oesophageal fibrosis and smooth muscle loss that impairs peristaltic motility. The result is ineffective transport of food and liquid down the oesophagus — not a swallowing problem in the pharyngeal sense but an oesophageal transport problem. Nearly all scleroderma patients with oesophageal involvement also have severe gastro-oesophageal reflux disease (GERD) due to lower oesophageal sphincter incompetence. Management prioritises maximising gravity-assisted transit, minimising reflux, and protecting the oesophageal mucosa from acid damage.

Scleroderma and the Oesophagus

Systemic sclerosis (SSc) — commonly called scleroderma — is an autoimmune condition characterised by progressive fibrosis of connective tissue, vascular abnormalities, and immune dysregulation. The oesophagus is the most commonly affected part of the gastrointestinal tract, involved in approximately 80–90% of patients with diffuse cutaneous SSc and 70–80% of limited cutaneous SSc (CREST syndrome) (Gyger & Baron, PMID: 25596884).

Mechanism of oesophageal dysfunction

Two primary mechanisms cause oesophageal dysfunction in scleroderma:

1. Smooth muscle fibrosis in the distal oesophagus: The lower two-thirds of the oesophagus contains smooth muscle (unlike the upper third, which is striated). In SSc, progressive collagen deposition replaces the smooth muscle, resulting in an aperistaltic (non-functioning) distal oesophagus. Swallowed food and liquid that enters the oesophagus is not propelled by coordinated peristaltic waves — it must transit by gravity alone.

2. Lower oesophageal sphincter (LES) incompetence: The LES is normally a high-pressure zone preventing gastric content from refluxing into the oesophagus. In SSc, fibrosis of the smooth muscle comprising the LES reduces or eliminates this pressure barrier. The result is a permanently incompetent LES, allowing continuous reflux of gastric acid and, importantly, pepsin and bile acids, into the oesophagus and potentially the pharynx and larynx.

What this means clinically

GERD in Scleroderma: The Dominant Management Challenge

Gastro-oesophageal reflux disease in scleroderma is not ordinary GERD. The absence of a functioning LES and the absence of oesophageal clearing (which in healthy individuals would clear occasional acid reflux within seconds via secondary peristalsis) means acid, pepsin, and bile acids remain in contact with the oesophageal mucosa for prolonged periods.

Complications of untreated GERD in SSc

GERD management approach

Proton pump inhibitors (PPIs): High-dose PPIs are the standard first-line treatment. Standard doses are often insufficient in SSc — high-dose PPI (twice-daily dosing before meals) is commonly required. Despite PPIs, non-acid (weakly acidic, pepsin, bile acid) reflux continues because the LES incompetence is the structural problem, not excess acid production. PPIs reduce acid damage but do not normalise reflux volume.

Prokinetics: Metoclopramide and domperidone accelerate gastric emptying, which reduces the volume of gastric content available for reflux. These are often used adjunctively in SSc GERD, though their effectiveness at restoring oesophageal motility is limited.

Endoscopic management: Regular upper endoscopy is recommended for surveillance of Barrett’s oesophagus. If oesophageal stricture develops, endoscopic balloon dilation can improve dysphagia. The rheumatologist or gastroenterologist managing SSc should coordinate this.

Dietary and Positioning Management

Upright positioning — the most important intervention

Given that gravity is the primary transit mechanism in the aperistaltic scleroderma oesophagus:

Small, frequent meals

The rationale for frequent small meals in SSc is different from dysphagia: it is about volume. Large meals distend the stomach, increase LES pressure differential, and flood the poorly clearing oesophagus with refluxate. Small meals (six per day of reduced size) reduce peak gastric distension and therefore reduce reflux burden.

Target per-meal volume: approximately 150–200 ml of food per sitting for patients with significant oesophageal and gastric involvement. Total daily intake targets remain the same — the volume is distributed, not reduced.

Food avoidances

Classic GERD triggers reduce LES tone or increase acid production and should be minimised:

Soft, moist textures

The aperistaltic oesophagus cannot propel dry, hard, or large boluses by gravity alone — they lodge and cause impaction. The dietary texture modification for scleroderma dysphagia is therefore:

Note: The IDDSI level requirement in scleroderma is driven by oesophageal transit, not pharyngeal swallowing function. A patient may have intact pharyngeal swallowing at IDDSI Level 7 but still require Level 6 soft foods due to the oesophageal impaction risk.

Nutritional Risk in Scleroderma

Malnutrition is common in SSc with severe GI involvement (Guideline: EULAR Recommendations for SSc, 2017). Contributing factors include:

Regular dietitian review and assessment of weight, BMI, and nutritional intake is part of comprehensive SSc management. In HK, dietitian referral can be obtained through the HA rheumatology clinic.

When to consider enteral nutrition: When oral intake falls consistently below 60% of estimated energy requirements despite dietary modification, or when weight loss exceeds 10% over 6 months, discussion of nasogastric or PEG feeding should occur. Small intestinal dysmotility in SSc may make PEG feeding via gastric route less effective — jejunal feeding tube placement may be considered in these cases.

Hong Kong Considerations

Scleroderma is managed by the rheumatology services at all major HA hospitals. The largest outpatient rheumatology clinics are at:

For patients with significant GI involvement, gastroenterology co-management is recommended. Dietitian referral within the rheumatology or gastroenterology follow-up is available — request it specifically if nutritional status is a concern.

For upright positioning technique, see Positioning for Safe Swallowing: A Practical Guide. For managing GERD alongside dysphagia, see GERD and Dysphagia: When Reflux Complicates Swallowing Management.