Figure 73

Cardiac output. An increase in cardiac output has been suggested as a mechanism for hypertension, particularly in its early borderline phase [3,4]. Sodium and water retention have been theorized to be the initiating events. Sequential changes following salt loading are depicted [3]. The resultant high cardiac output perfuses the peripheral tissues in excess of their metabolic requirements, resulting in a normal autoregulatory (vasoconstrictor) pressure. The early phase of high cardiac output and normal peripheral vascular resistance gradually changes to the characteristic feature of the sustained hypertensive state: normal cardiac output and high peripheral vascular resistance. Shown here are segmental changes in the important cardiovascular hemodynamic variables in the first few weeks following the onset of short-term salt-loading hypertension. Note especially that the arterial pressure increases ahead of the increase in total peripheral resistance. (From Guyton and coworkers [3]; with permission.)

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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