Interventions to improve symptomatology in patients with hypothyroidism and persistent symptoms: A systematic review.

A systematic review of interventions for hypothyroidism patients with persistent symptoms identified only seven studies meeting inclusion criteria from 277 articles reviewed.

• Systematic search conducted in March 2022 for randomized controlled trials and observational studies
• Inclusion criteria required adult patients with persistent hypothyroid symptoms despite biochemical euthyroidism on thyroid hormone replacement
• 277 articles were reviewed and seven fulfilled the inclusion criteria
• 455 total participants were included across the seven studies
• Most intervention participants were female (78.6%) with a mean age of 47.5 (±2.8) years

Five clinical trials evaluating ginger, L-carnitine, combination LT4/LT3, and surgery found inconsistent improvement in hypothyroidism-related symptoms and general health.

• Interventions evaluated included ginger (vs. starch), L-carnitine (vs. placebo), combination LT4 and liothyronine LT3 (vs. LT4 or placebo), and surgery for patients with serum antithyroid peroxidase (TPO Ab) titers greater than 1000 IU/ml (vs. LT4)
• Results were described as 'inconsistent improvement in hypothyroidism related symptoms and general health'
• The two clinical trials with the largest improvement in fatigue scores were the use of ginger and surgery
• Evidence was limited by risk of bias, inconsistency, and heterogeneity

An observational study comparing thyroidectomy versus observation found no significant difference in general health outcomes.

• This was one of two observational studies identified in the systematic review
• The comparator group was observation (no surgery)
• No significant difference on general health was found between the two groups
• This contrasted with the clinical trial of surgery, which showed one of the largest improvements in fatigue scores

An observational study evaluating combination LT4/LT3 versus LT4 monotherapy found improvement in fatigue and quality of life.

• This was one of two observational studies identified in the review
• The comparator was LT4 monotherapy alone
• Outcomes showing improvement included fatigue and quality of life
• This finding contrasted with the inconsistent results seen in clinical trials evaluating combination LT4/LT3 therapy

Adverse events occurred at similar rates in intervention and comparator groups across included studies.

• There were 31 (12%) adverse events in the intervention group
• There were 18 (10.8%) adverse events in the comparator group
• Adverse event rates were comparable between groups, suggesting no substantial additional harm from the interventions studied

Approximately 10–15% of hypothyroidism patients experience persistent symptoms despite normalizing thyroid hormone levels with levothyroxine monotherapy.

• Levothyroxine (LT4) monotherapy is described as the standard treatment for hypothyroidism
• The prevalence of persistent symptoms despite biochemical euthyroidism is estimated at 10–15% of patients
• This patient population served as the target group for the systematic review
• The persistence of symptoms despite normal thyroid hormone levels represents the clinical problem motivating the review

There is no high-quality evidence supporting any intervention for persistent symptoms in hypothyroidism.

• Available evidence was described as 'limited by the risk of bias, inconsistency, and heterogeneity'
• Only seven studies met inclusion criteria despite reviewing 277 articles
• The authors concluded that 'there is no high-quality evidence supporting any intervention for persistent symptoms in hypothyroidism'
• Despite this, ginger and thyroidectomy were identified as having some evidence for improving fatigue specifically