Txy

Use VF protocol

Fig. 24.2 (continued)

volume load and can be excessive, e.g. when there is valvular incompetence.

• Afterload refers to the load on the contracting ventricle created by the resistance to the blood injected by the ventricle into the arterial system, i.e. the total peripheral resistance. Afterload is thus a pressure load and is excessive, e.g. in arterial hypertension.

• Contractility refers to the capacity of the myocardium to generate the force necessary to respond to preload and to overcome afterload.

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