Ancient herbal paste put to the test against heart disease chest pain

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age 18-75 years, both sexes eligible; 2. Meets the diagnostic criteria for stable angina pectoris in ischemic heart disease (IHD), with stable condition for ≥4 weeks; 3. Has received standard Western medical treatment (including but not limited to antiplatelet agents, lipid-modifying/stabilizing plaque therapy, β-blockers, etc.) for at least 4 weeks, with stable dosages; 4. Meets the Traditional Chinese Medicine (TCM) syndrome diagnostic criteria of "thoracic yang deficiency with heart vessel stasis" (or "chest yang insufficiency with heart meridian blood stasis"), with primary symptoms: chest oppression/pain, palpitations; at least 2 secondary symptoms: insomnia, aversion to cold, spontaneous sweating, irritability or restlessness; supported by tongue and pulse findings; 5. Has signed the informed consent form and is willing to participate voluntarily in the study. Exclusion Criteria: 1. Acute coronary syndrome or patients requiring emergency revascularization; 2. Use of traditional Chinese medicine (TCM) or Chinese patent medicines with therapeutic effects on ischemic heart disease within the past 2 weeks; 3. Poorly controlled hypertension (systolic blood pressure ≥160 mmHg or diastolic blood pressure ≥100 mmHg after treatment); 4. Severe heart failure (NYHA functional class IV), uncontrolled malignant arrhythmias, cardiogenic shock; severe cerebrovascular diseases; active or recurrent digestive system ulcers or other diseases with bleeding risk; other severe digestive system diseases; complicated with malignant tumors, hematological disorders, or other severe or progressive systemic diseases; complicated with other mental disorders that render the patient unable or unwilling to cooperate; 5. Severe hepatic or renal impairment (ALT/AST \> 3 × upper limit of normal, or creatinine \> 1.5 × upper limit of normal); 6. Known allergy to any component of the study formula; 7. Women who are pregnant, lactating, or planning pregnancy; 8. Patients who have participated in other clinical trials within the past 3 months; 9. Patients deemed by the investigator to be unsuitable for participation in the clinical trial.