Persistent macrovascular and microvascular dysfunction in patients with malignant hypertension.

Area of Science:

• Cardiovascular Medicine
• Hypertension Research
• Vascular Biology

Background:

• Endothelial dysfunction is a hallmark of essential hypertension.
• Limited data exist on endothelial function in malignant-phase hypertension.
• Understanding vascular damage in malignant hypertension is crucial for patient outcomes.

Purpose of the Study:

• To investigate myocardial perfusion and endothelial function in patients with previous malignant hypertension.
• To compare macrovascular and microvascular endothelial damage/dysfunction in malignant hypertension, high-risk hypertension, and healthy controls.
• To assess circulating endothelial and progenitor cells and arterial stiffness in these groups.

Main Methods:

• Real-time quantitative myocardial contrast echocardiography for perfusion.
• Brachial artery ultrasound for flow-mediated dilation and glyceryl trinitrate response.
• Laser Doppler for microvascular forearm response to acetylcholine and sodium nitroprusside.
• Pulse wave velocity, circulating endothelial cells, and endothelial progenitor cells were measured.

Main Results:

• Malignant hypertension patients exhibited impaired endothelial-dependent response to acetylcholine and reduced response to both microvascular stimuli compared to healthy subjects.
• Patients with malignant hypertension showed increased circulating endothelial cells, endothelial progenitors, and arterial stiffness.
• Both hypertensive groups had impaired response to hyperemia and glyceryl trinitrate, and lower myocardial perfusion than controls.

Conclusions:

• Malignant hypertension leads to more pronounced macrovascular and microvascular dysfunction than high-risk hypertension, even with controlled blood pressure.
• Both endothelium-dependent and independent pathways appear affected in malignant hypertension.
• These findings highlight persistent vascular abnormalities following malignant hypertension.