Seven Mathematical Models of Hemorrhagic Shock

Table 4

Model parameters (adapted from Table 1 in Beard et al. [11], p. 5).

	Description	Unit
Aorta/large-artery mechanics
	Unstressed volumes	ml
	Unstressed diameter	mm
	Acute compliance
	Creep parameter of aortic wall	#
	Time constant of stress relaxation	sec
Kinetics of baroreflex
	Adjustable parameter of baroreflex afferent model	sec
	Baroreceptor activation rate
	Baroreceptor deactivation rate
	Baroreceptor saturation constant	#
	Baroreceptor gain parameter
Cardiac and circulatory mechanics
	Maximum value of elastance	mmHg·
	Minimum value of elastance	mmHg·
	Cardiac cycle timing parameter	#
	Cardiac cycle timing parameter	#
	Heart rate parameter
	Heart rate parameter
	Aortic valve resistance	mmHg min·
	Aortic resistance	mmHg min·
	Large-artery resistance	mmHg min·
	Downstream venous resistance	mmHg min·
	Large-artery compliance	ml·
	Downstream venous resistance	ml·
	Unstressed volume of cardiovascular system	ml
	Venous creep parameter	#
	Venous creep time constant	sec
	Arterial and venous compliance parameter	sec
	Arterial resistance parameter	sec
	Arterial and venous compliance parameter	sec
	Arterial resistance parameter	sec
	Autoregulation parameter	ml·
	Autoregulation parameter	ml·
	Autoregulation parameter	min
	Autoregulation parameter	sec
Autonomic system
	Constant parameter of baroreflex arc
Renin-angiotensin system
	Time constant for renin production	min
	Time constant for angiotensin II production	min
	Time constant for mean pressure calculation	sec
	Steady-state renin-angiotensin system tone	mmHg
	Steady-state renin-angiotensin system tone	mmHg
	Steady-state renin-angiotensin system tone	mmHg
Pressure-diuresis/natriuresis control
	Slope of acute pressure-diuresis relationship	ml··mm
	Maximum value for variable offset in the pressure-diuresis relationship	mmHg
	Minimum value for variable offset in the pressure-diuresis relationship	mmHg
	Long-term pressure-diuresis relationship	#
	Long-term pressure-diuresis relationship	#
	Time constant for long-term pressure diuresis	min