Electrical Cardiometry as a Novel Tool for Assessing Systemic Vascular Resistance and Cardiac Function in Obstructive...

Area of Science:

• Cardiology
• Sleep Medicine
• Medical Technology

Background:

• Obstructive sleep apnea syndrome (OSAS) is linked to sympathetic overactivity, intermittent hypoxia, and increased vascular resistance, contributing to cardiovascular issues.
• Electrical cardiometry (EC) is a non-invasive method for continuous hemodynamic monitoring, including systemic vascular resistance (SVR) and cardiac output (CO).

Purpose of the Study:

• To compare systemic vascular resistance (SVR) and systemic vascular resistance index (SVRI) measured by EC between patients with OSAS and healthy controls.
• To evaluate the utility of EC in assessing hemodynamic alterations associated with OSAS.

Main Methods:

• A retrospective case-control study involving 33 patients with confirmed OSAS and 37 age- and sex-matched healthy controls.
• Standard EC measurements were performed under resting, supine conditions to assess hemodynamic parameters like SVR, SVRI, and cardiac index (CI).

Main Results:

• Patients with OSAS exhibited significantly higher SVR and SVRI compared to controls.
• Cardiac index (CI) was significantly lower in the OSAS group, indicating increased vascular load and reduced cardiac performance.

Conclusions:

• This is the first study to utilize EC in the context of OSAS.
• EC-derived parameters, specifically SVRI and CI, effectively distinguished OSAS patients from healthy individuals, reflecting heightened vascular afterload and diminished cardiac function.
• EC shows promise as a feasible, non-invasive tool for evaluating hemodynamic changes in OSAS, with potential applications in bedside monitoring and risk stratification.