Hydrochlorothiazide-induced acute non-cardiogenic pulmonary edema

Area of Science:

• Pharmacology
• Immunology
• Pulmonary Medicine

Background:

• Hydrochlorothiazide is a commonly prescribed thiazide diuretic used to treat hypertension and edema.
• Non-cardiogenic pulmonary edema is a rare but serious adverse effect associated with certain medications.

Observation:

• A 64-year-old male experienced recurrent episodes of non-cardiogenic pulmonary edema following oral administration of hydrochlorothiazide (12.5 mg).
• In vitro immunologic studies, including basophil activation and late cellular activation (CD69, interferon-gamma production) using chlorothiazide, showed no immune cell activation.

Findings:

• The observed non-cardiogenic pulmonary edema in this case is likely an idiosyncratic reaction to hydrochlorothiazide.
• The pathogenic mechanism underlying this adverse drug reaction remains undetermined, despite in vitro testing.

Implications:

• This case highlights the potential for rare, idiosyncratic adverse reactions to commonly used diuretics like hydrochlorothiazide.
• Further research is needed to elucidate the unknown mechanisms of diuretic-induced pulmonary edema to improve patient safety and management strategies.