Hypertension and catecholamine levels in sleep apnoea

Area of Science:

• Cardiology
• Sleep Medicine
• Endocrinology

Background:

• Sleep-disordered breathing (SDB) is strongly linked to systemic hypertension.
• Increased sympathetic nervous system activity is a potential mechanism for this association.

Purpose of the Study:

• To evaluate the prevalence of hypertension in patients with SDB.
• To investigate the relationship between SDB severity, hypertension, and catecholamine levels.

Main Methods:

• 82 newly diagnosed SDB patients were assessed for hypertension.
• Plasma and urinary catecholamine levels were measured.
• Catecholamine levels were correlated with sleep apnoea severity and blood pressure.

Main Results:

• Hypertension prevalence was 46.3% in the study population.
• Blood pressure strongly correlated with the apnoea-hypopnoea index.
• Higher urinary catecholamine levels were observed in severe SDB and hypertensive patients.

Conclusions:

• Hypertension is highly prevalent in Indian patients with obstructive sleep apnoea (OSA).
• Elevated catecholamine levels are associated with OSA severity and hypertension.
• 24-hour urinary catecholamine levels are a more reliable indicator of sympathetic activity than plasma samples.