STREAMLINE BLOOD FLOW:
Silent blood flow caused by the ability of heart to eject the blood through blood vessels against the Maximum Natural Peripheral Resistance [MNPR] in the vascular system. MNPR is inherently possible due to various factors but chiefly diameter of the blood vessel.
TURBULENT BLOOD FLOW:
Noise-making blood flow caused by the ability of heart to eject the blood through blood vessels against artificial resistance higher in value than MNPR in the vascular system. Artificial resistance can be applied by external means { like cuff of Sphygmomanometer}, that can reduce the diameter of the blood vessel. For example, if the BP of a person is recorded as 120 mm Hg / 80 mm Hg, then the turbulent blood flow will start from 120 mm Hg and gradually changes completely into streamline blood flow at 80 mm Hg.
* MNPR = 80 mm Hg
NO BLOOD FLOW, SO NO SOUND HEARD ON AUSCULATATION:
Blood flow can be stopped if there is lack of ability of heart to eject the blood through blood vessels against resistance greater than Maximal Artificial Peripheral Resistance {MAPR}. MAPR is the point at which the heart can maximally work and eject the blood with maximum turbulence. For example, if the BP of a person is recorded as 120 mm Hg / 80 mm Hg, then;
MAPR = 120 mm Hg.
INTERPRETATION :
It is 'ejection' of blood that has to overcome MNPR and MAPR to establish streamline blood flow and turbulent blood flow, respectively. Ejection effect is related to 'SYSTOLE'. Based on this view, perhaps the traditional cardio terminologies related to BP need a change but with strong consensus.
EXAMPLE:
1.
[a] Traditional : 120 mm Hg [Systolic pressure] / 80 mm Hg [Diastolic pressure]
[b] Proposed : 120 mm Hg [Highest Systolic pressure] / 80 mm Hg [ Lowest systolic pressure]
2.
[a] Traditional: Pulse pressure = Systolic pressure - Diastolic pressure
[b] Proposed : Pulse pressure = Highest systolic pressure - Lowest systolic pressure
3.
[a] Traditional: Mean pressure = Diastolic pressure + { Pulse pressure/3}
[b] Proposed: Mean pressure = Lowest systolic pressure + { Pulse pressure/3}
NOTE : Lowest systolic pressure is the base-line systolic pressure.
Sunday, August 31, 2008
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