Presumed hydrochlorothiazide-associated immunologic-hypersensitivity-induced pericardial effusion

Area of Science:

• Cardiology
• Pharmacology
• Immunology

Background:

• Pericardial effusion is the abnormal accumulation of fluid in the pericardial space.
• Cardiac tamponade is a life-threatening condition caused by excessive pericardial effusion.
• Hydrochlorothiazide is a widely prescribed thiazide diuretic for hypertension management.

Purpose of the Study:

• To investigate a potential link between hydrochlorothiazide use and the development of pericardial effusion.
• To explore the role of immunologic-hypersensitivity reactions in drug-induced pericardial effusion.
• To evaluate the effect of hydrochlorothiazide discontinuation on recurrent pericardial effusion.

Main Methods:

• Case report of a patient with recurrent pericardial effusion.
• Review of patient's medical history, including medication regimen and allergies.
• Echocardiographic monitoring of pericardial effusion size before and after medication withdrawal.

Main Results:

• The patient developed a large pericardial effusion after initiating hydrochlorothiazide for hypertension.
• Recurrent effusions were observed despite initial treatment and drainage.
• Substantial and near-complete resolution of the effusion occurred after discontinuing hydrochlorothiazide, with no other interventions.

Conclusions:

• Hydrochlorothiazide may trigger an immune-mediated hypersensitivity reaction leading to pericardial effusion.
• Discontinuation of the offending drug can be an effective treatment for drug-induced pericardial effusion.
• This case highlights the importance of considering drug reactions in the differential diagnosis of pericardial effusion.