Research Briefs
One-page summaries of key hirudotherapy research topics
These research briefs provide concise overviews of key evidence areas in hirudotherapy. Each brief summarizes the current state of evidence, key studies, and clinical implications. Tier badges indicate the ASH evidence classification: Tier A (FDA-cleared), Tier B (RCT-supported), or Tier C (investigational).
Microsurgery & Flap Salvage
Tier AFDA-cleared indication. 78% reported success rate of leech therapy across the reviewed cases. Whitaker systematic review of 277 cases.
Knee Osteoarthritis
Tier B2 RCTs (Michalsen 2003, Andereya 2008) of leech therapy in knee osteoarthritis. Michalsen 2003 used topical diclofenac as comparator; Andereya 2008 used a sham control (an 'artificial leech') and found KOOS, WOMAC and VAS improvement in all groups, significant in the leech-treated groups.
Cardiovascular Applications
Tier CUncontrolled, non-indexed Russian-language reports of ECG changes; no randomized controlled trials. Level IV evidence from case series and cohort studies.
Stroke & Rehabilitation
Tier CCase series data on cerebrovascular applications. Neurological recovery outcomes from international practice.
Venous Disease
Tier CThrombophlebitis, chronic venous insufficiency, and microcirculation effects. Established international use.
Antibiotic Prophylaxis
Tier BCiprofloxacin + TMP-SMX dual regimen. Emerging Aeromonas resistance data and alternative protocols.
Salivary Pharmacology
Tier A100+ bioactive compounds identified in salivary gland secretion. Drug development pipeline from leech-derived molecules.
Circulatory Effects
Tier CECG changes, phase analysis, blood pressure modulation. Hemodynamic monitoring data from clinical studies.
Anti-Inflammatory Mechanisms
Tier BEglins, bdellins, LDTI, and complement inhibitors. Molecular pathways of leech-mediated anti-inflammatory action.
Drug Development
Tier BDestabilase, decorsin, RGD peptides. Preclinical pipeline and pharmaceutical derivatives from leech compounds.
Evidence Methodology
For details on how ASH classifies and evaluates clinical evidence, including the GRADE framework, study design hierarchy, and the 3-tier classification system, see the Evidence Assessment page.
Evidence Assessment →Full Research Library
Browse the complete collection of research articles, in-depth analyses, and pharmacological reviews in the Science Hub.
Science Hub →Transparency & methodology: /how-evidence-graded (GRADE workflow) · /pmid-audit-status (verification dashboard) · /research-roadmap (10k-article phase tracker).