Key result
Hypertension was consistently associated with elevated impedance moduli at 0 Hz and heart rate frequency, and an increased frequency where impedance phase first crosses 0, compared to controls.
Why the study?
Are input impedance variables (Z(0), Z(1), f(0), Z(c)) altered in patients with hypertension compared to controls?
Population
11 studies reporting computed impedance moduli from hypertension (HTN) and control (CNT) groups
Comparison
Evaluation of input impedance variables (Z, Z… vs Control groups (normotensive)
Design
Systematic_review
Authors
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May enhance vascular phenotyping in hypertension; extends systematic evidence but leaves Z(c) utility open.
Systematic Review
Are input impedance variables (Z(0), Z(1), f(0), Z(c)) altered in patients with hypertension compared to controls?
Input impedance variables Z(0), Z(1), and f(0) are significantly associated with hypertension, while the role of characteristic impedance (Z(c)) remains unclear.
Li et al. (2012) conducted a systematic review in Hypertension. Hypertension vs. Control was evaluated on Impedance moduli (Z(0), Z(1), f(0), Z(c)). Hypertension was consistently associated with elevated impedance moduli at 0 Hz and heart rate frequency, and an increased frequency where impedance phase first crosses 0, compared to controls.
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