Physical Diagnosis - Physiological changes on standing
7-8 ml/kg of blood ( 350-600 ml) will shift to the lower body within 1-2 minutes.
This will decrease the stroke volume, intra thoracic volume and cardiac output and will increase the circulating catecholamines.This will increase systemic vascular resistance and heart rates.
The blood will also shift from pulmonary to systemic circulation. The compensatory changes directed towards normalising blood pressure.Orthostatic changes will occur due to the loss of blood or autonomic dysregulation.
7-8 ml/kg of blood ( 350-600 ml) will shift to the lower body within 1-2 minutes.
This will decrease the stroke volume, intra thoracic volume and cardiac output and will increase the circulating catecholamines.This will increase systemic vascular resistance and heart rates.
The blood will also shift from pulmonary to systemic circulation. The compensatory changes directed towards normalising blood pressure.Orthostatic changes will occur due to the loss of blood or autonomic dysregulation.