Causes of diastolic hypertension
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Key Causes of Diastolic Hypertension
Essential Hypertension and Chronic Kidney Disease
Essential hypertension is one of the most common causes of diastolic hypertension, where the underlying reason for high blood pressure is not secondary to another medical condition. Chronic nephritis, a form of chronic kidney disease, is also a major contributor to elevated diastolic blood pressure. When neither of these conditions is present, other less common causes may be considered, but essential hypertension and chronic nephritis remain the primary culprits in most cases .
Cardiac Structural Changes and Diastolic Dysfunction
Diastolic hypertension is closely linked to changes in the heart’s structure and function, particularly left ventricular diastolic dysfunction (LVDD). In hypertension, the heart muscle often becomes stiffer and less able to relax during the diastolic phase, leading to impaired ventricular filling. This dysfunction can occur even before visible thickening of the heart muscle (left ventricular hypertrophy) is detected. Myocardial fibrosis (scarring of the heart tissue) and ischemia (reduced blood flow) are important factors that contribute to this impaired relaxation and increased diastolic pressure Ottosen2024Slama2002Rekha2021.
Vascular Stiffness and Neurohormonal Activation
Increased vascular stiffness is a hallmark of hypertension and plays a significant role in raising diastolic blood pressure. As arteries become less flexible, the resistance against which the heart must pump increases, leading to higher diastolic pressures. Additionally, neurohormonal activation—such as increased activity of the renin-angiotensin-aldosterone system—further contributes to both vascular stiffness and diastolic dysfunction .
Age, Diabetes, and Other Risk Factors
Age is a significant risk factor for diastolic hypertension, as blood vessels naturally stiffen over time. Diabetes mellitus also contributes to diastolic dysfunction and elevated diastolic blood pressure, often acting together with hypertension to worsen cardiac relaxation. Sex may play a minor role, but its impact is less pronounced compared to age, hypertension, and diabetes .
Conclusion
Diastolic hypertension is most commonly caused by essential hypertension and chronic kidney disease, but it is also strongly influenced by structural changes in the heart, vascular stiffness, neurohormonal factors, age, and diabetes. These factors often interact, making diastolic hypertension a complex condition with multiple contributing mechanisms Ottosen2024Deller1942Slama2002+2 MORE.
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