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Cardiac output, oxygen consumption and renal blood flow in essential hypertension
Insights
Essential hypertension alters energy metabolism in red blood cells. Patients showed abnormal oxygen consumption and transport compared to healthy individuals, suggesting erythrocyte energy cost issues.
Area of Science:
- Cardiovascular Physiology
- Hematology
- Metabolic Disorders
Background:
- Sustained essential hypertension is a common cardiovascular condition.
- Understanding its impact on systemic and cellular energy metabolism is crucial.
Purpose of the Study:
- To investigate cardiac output, oxygen consumption, blood volume, and circulatory transit time in hypertensive men versus normal subjects.
- To explore correlations between these parameters and identify abnormalities in hypertensive patients.
Main Methods:
- Comparative analysis of physiological parameters at rest.
- Measurement of cardiac output, oxygen consumption, total blood volume, and mean circulatory transit time.
- Correlation analysis between measured parameters in hypertensive and normal subjects.
Main Results:
- Oxygen consumption correlated positively with cardiac output in both groups, but less steeply in hypertensives.
- Oxygen consumption negatively correlated with mean circulatory transit time, but not total blood volume.
- Normal subjects showed a positive correlation between mean circulatory transit time and arteriovenous oxygen difference, absent in hypertensives.
Conclusions:
- Hypertension is associated with altered oxygen consumption and transport dynamics.
- Findings suggest potential abnormalities in erythrocyte energy transport and utilization in sustained essential hypertension.
- Further research into erythrocyte energy metabolism in hypertension is warranted.
Abstract:
Cardiac output, oxygen consumption, total blood volume and mean circulatory transit time were investigated at rest in men with sustained essential hypertension in comparison with normal subjects of the same age and sex. In normal subjects and in patients with hypertension, oxygen consumption was positively correlated to cardiac output. In hypertensives, the slope of the curve was significantly shallower with an increase in arteriovenous oxygen difference. Oxygen consumption in both populations was negatively correlated with mean circulatory transit time but not with total blood volume. In normal subjects, mean circulatory transit time and arteriovenous oxygen difference were positively correlated. The correlation was not significant in hypertensive patients. The study suggests important abnormalities in the transport and cost of energy in erythrocytes of patients with sustained essential hypertension.