Coronary microvascular dysfunction induced by primary hyperparathyroidism is restored after parathyroidectomy

Area of Science:

• Cardiology
• Endocrinology
• Vascular Biology

Background:

• Symptomatic primary hyperparathyroidism (PHPT) is linked to higher cardiovascular mortality.
• Limited data exist on the cardiovascular risks associated with asymptomatic PHPT.
• Coronary flow reserve (CFR) serves as a key indicator of coronary microvascular function.

Purpose of the Study:

• To evaluate coronary microvascular function in patients with asymptomatic PHPT.
• To assess the role of parathyroid hormone (PTH) in coronary microvascular dysfunction.
• To determine the impact of parathyroidectomy on coronary microvascular function in PHPT.

Main Methods:

• Transthoracic Doppler echocardiography was used to measure CFR in 100 asymptomatic PHPT patients and 50 controls.
• CFR was assessed at rest and during adenosine-induced hyperemia.
• Statistical analyses, including multivariable regression, were performed to identify factors associated with CFR.

Main Results:

• Asymptomatic PHPT patients exhibited significantly lower CFR compared to controls (P<0.0001).
• CFR was inversely correlated with parathyroid hormone (PTH) levels (r=-0.3, P<0.004).
• Parathyroidectomy normalized CFR in patients with impaired coronary microvascular function (P<0.0001).

Conclusions:

• Asymptomatic PHPT is associated with coronary microvascular dysfunction.
• PTH levels independently correlate with the severity of coronary microvascular impairment.
• Parathyroidectomy effectively reverses coronary microvascular dysfunction in PHPT patients.