The hemodynamics in labile hypertension

The hemodynamics have been studied in 73 subjects selected on the basis of an arbitrary definition for an elevated blood pressure. Two hemodynamic patterns were observed: (1) high output and low resistance, and (2) normal cardiac output and elevated total peripheral resistance. There is some theoretical and clinical evidence that the high cardiac output may indicate a more mild hypertension in terms of severity and the likelihood of the development of fixed essential hypertension. Final proof awaits long-term follow-up, and such a study is underway.