Related Experiment Videos
Redevelopment of essential hypertension after cessation of long term therapy; preliminary findings
Insights
Essential hypertension's underlying causes persist despite normalized blood pressure with treatment. Stopping medication reveals rapid blood pressure increases, driven by cardiac output, not vascular resistance.
Area of Science:
- Cardiology
- Hypertension Research
- Vascular Biology
Background:
- Vascular hypertrophy contributes significantly to elevated total peripheral resistance index (TPRI) in essential hypertension.
- Antihypertensive treatment can reverse this hypertrophy, but blood pressure rebounds upon cessation, indicating persistent underlying causes.
- Previous studies suggest the original cause of hypertension remains despite normalized blood pressure.
Purpose of the Study:
- To investigate the hemodynamic and physiological changes upon withdrawal of antihypertensive therapy in patients with essential hypertension.
- To identify factors contributing to the rapid return of hypertension after a prolonged period of normotension.
Main Methods:
- Seven patients with essential hypertension stopped their standard antihypertensive regimen for 10 weeks after at least two years of normotension.
- Measurements included standing and lying blood pressure, supine cardiac index (CI), and TPRI.
- Assessed changes in sympathetic activity, plasma volume, and renin-angiotensin system activity.
Main Results:
- Within the first week of stopping treatment, both standing and lying blood pressure increased, correlating with rises in supine CI and TPRI.
- Over the 10 weeks, standing pressures, supine systolic blood pressure, and CI continued to rise.
- Supine diastolic blood pressure and TPRI remained unchanged, and observed changes were not explained by sympathetic activity, plasma volume, or renin-angiotensin levels.
Conclusions:
- The rapid return of hypertension after effective therapy cessation in essential hypertension is characterized by increasing systolic blood pressure and cardiac index.
- These changes resemble patterns seen in borderline hypertension, suggesting a potential role for cardiac and vascular amplifiers.
- The findings highlight that the primary drivers of hypertension may persist even after successful treatment and reversal of vascular changes.
Abstract:
We have previously found that the vascular hypertrophy that accounts for the maintenance of a substantial fraction of the elevation of the total peripheral resistance index (TPRI) in essential hypertension can be almost completely reversed by one years antihypertensive treatment (1). On ceasing treatment, blood pressure returns rapidly to pretreatment values suggesting that the original cause of the hypertension is still present. In the present study, 7 patients stopped a standard regimen for 10 weeks after at least 2 years of normotension. In the first week, standing and lying blood pressure increased related to rise in supine cardiac index and TPRI. Thereafter standing pressures, supine systolic blood pressure and cardiac index (CI) increased further, but supine diastolic blood pressure and TPRI did not alter. Changes in measurements of resting sympathetic activity, plasma volume or renin-angiotensin did not account for these observations. The return of hypertension after stopping effective therapy has some features previously described in borderline hypertension, particularly increasing systolic blood pressure, CI and postural blood pressure responses. Some of the changes may reflect the relative preponderance of cardiac and vascular amplifiers.