Key result
Hypertension is linked to ~50% higher systemic vascular resistance at high altitude.
Why the study?
Hemodynamic phenotypes may help explain heterogeneity in hypertension, but it remained uncertain whether vascular resistance at altitude reflects altitude itself, hypertension, or their interaction.
Does hypertension status, residential altitude (high vs. middle), or their interaction influence systemic vascular resistance and cardiac structure in adults living at middle and high altitudes?
Cross-Sectional (n=646)
No
Does hypertension status, residential altitude (high vs. middle), or their interaction influence systemic vascular resistance and cardiac structure in adults living at middle and high altitudes?
In adults living at middle and high altitudes, hypertension is consistently associated with a resistance-dominant hemodynamic profile (~46%-50% higher SVR) and greater interventricular septal thickness, without significant modification by altitude stratum.
Answers are grounded in this paper and cite their sources.
Hypertension links to higher SVR at altitude without interaction; leaves open whether residential altitude modifies hemodynamics in prospective cohorts.
Hemodynamic phenotypes may help explain heterogeneity in hypertension, but it remains uncertain whether vascular resistance at altitude reflects altitude itself, hypertension, or their interaction. This single-center cross-sectional study included adults evaluated at Qinghai Provincial People’s Hospital from May 2024 to December 2025. Groups were assigned from recorded residential altitude (middle altitude, 1500–2500 m; high altitude, > 2500–4500 m) and hypertension status. Nine records previously assigned to high altitude despite a recorded altitude of 2260 m were reassigned to middle altitude before analysis. Factorial models included altitude, hypertension, their interaction, age, sex, body mass index, diabetes, and coronary heart disease. SVR, SVRI, and SSVRI were log-transformed, and HC3-robust 95% confidence intervals (CIs) were used. The final analytic dataset included 646 participants (middle-altitude normotension, n = 111; middle-altitude hypertension, n = 139; high-altitude normotension, n = 247; high-altitude hypertension, n = 149). Hypertension was associated with higher systemic vascular resistance (SVR) at middle altitude (ratio 1.46, 95% CI 1.28–1.66) and high altitude (ratio 1.50, 95% CI 1.32–1.69), with concordant findings for SVRI and device-derived SSVRI (all P < 0.001). Neither altitude contrasts nor altitude-by-hypertension interactions were significant for these resistance outcomes. Adjusted cardiac output, stroke volume, and left ventricular ejection fraction did not show significant hypertension associations. Interventricular septal thickness was greater with hypertension at both altitude strata, without a significant interaction. In this cohort, hypertension was associated with a resistance-dominant hemodynamic profile at both altitude strata. We did not detect a statistically significant adjusted altitude contrast or altitude-by-hypertension interaction for resistance. ICG-derived hemodynamic estimates and echocardiographic measures were assessed in parallel; incremental diagnostic accuracy, treatment guidance, and clinical outcomes were not evaluated.
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Guo et al. (2026) conducted a cross-sectional in Hypertension across middle and high residential altitude (n=646). Hypertension (systolic BP ≥140 mmHg and/or diastolic BP ≥90 mmHg, or documented prior diagnosis on antihypertensive treatment) and residential altitude (high altitude >2500-4500 m vs middle altitude 1500-2500 m) vs. Normotension and middle residential altitude (1500-2500 m) was evaluated on Systemic vascular resistance (SVR) at high altitude (HA-H vs HA-N) (Ratio 1.50, 95% CI 1.32-1.69, p=<0.001). Hypertension was associated with higher systemic vascular resistance at both middle and high altitude, with no significant altitude-by-hypertension interaction.
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