Single measurement estimation of central blood pressure using an arterial transfer function

Area of Science:

• Cardiovascular Physiology
• Biomedical Engineering
• Medical Diagnostics

Background:

• Central blood pressure (BP) is a crucial indicator of cardiovascular risk, but its direct measurement is invasive.
• Existing methods for estimating central BP from peripheral measurements have limitations in accuracy and individualization.
• Arterial transfer functions offer a non-invasive alternative but often require unavailable data or are generalized.

Purpose of the Study:

• To develop and validate a novel, self-contained method for individualizing arterial transfer functions using a single peripheral pressure measurement.
• To accurately estimate central BP across various hemodynamic conditions without additional clinical measurements.
• To improve upon existing generalized and idealized transfer function models.

Main Methods:

• Pulse wave analysis of femoral BP waves was used to approximate central BP and arterial flow waveforms.
• Model parameters were identified using these approximations as objective functions.
• Accuracy was assessed against invasive aortic BP measurements in porcine models, comparing root mean squared error (RMSE), systolic, and pulse pressure errors.

Main Results:

• The proposed method demonstrated low mean bias and narrow limits of agreement for systolic and pulse pressure compared to a generalized transfer function model.
• Accuracy was superior to invasive femoral pressure measurements.
• The RMSE of the proposed method was comparable to an idealized transfer function and superior to the generalized model.

Conclusions:

• The developed single measurement method accurately estimates central BP from peripheral pressure measurements.
• It enables per-patient transfer function individualization, adapting to disease progression and treatment.
• This method offers accurate central BP estimation at no additional clinical cost.