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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
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Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
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Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
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Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
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Diffuse Alveolar Hemorrhage Linked to Hydralazine.

Joshua Kim1, Farzana Hoque2

  • 1Saint Louis University.

Journal of Brown Hospital Medicine
|March 3, 2025
PubMed
Summary

This case report details a rare instance of hydralazine-induced diffuse alveolar hemorrhage (DAH) and ANCA vasculitis. Early recognition and withdrawal of hydralazine are crucial for managing this severe adverse drug reaction.

Keywords:
HydralazineVasodilatordiffuse alveolar hemorrhage (DAH)drug-induced vasculitisglomerulonephritishydralazine-induced ANCA vasculitis

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Area of Science:

  • Cardiovascular Medicine
  • Pulmonary Medicine
  • Nephrology

Background:

  • Hydralazine, a vasodilator for hypertension, can cause vasculitis, glomerulonephritis, and drug-induced lupus.
  • Diffuse alveolar hemorrhage (DAH) is a rare but serious adverse effect of hydralazine therapy.

Observation:

  • A 74-year-old male with hypertension presented with hemoptysis, dyspnea, and dark urine.
  • Biopsy confirmed leukocytoclastic vasculitis, MPO antibodies were elevated, and bronchoscopy showed DAH.
  • The patient developed pulmonary-renal syndrome with worsening renal function and anemia, despite no glomerulonephritis.

Findings:

  • Hydralazine cessation and methylprednisolone treatment led to significant clinical improvement.
  • The case highlights hydralazine-induced ANCA vasculitis presenting as DAH.
  • Pulmonary-renal syndrome was evident without concurrent glomerulonephritis.

Implications:

  • Clinicians should consider hydralazine-induced ANCA vasculitis in patients with unexplained pulmonary hemorrhage.
  • Prompt diagnosis and drug withdrawal are vital for preventing severe complications.
  • This case expands the known spectrum of hydralazine-induced autoimmune conditions.