After a severe injury, a patient's blood pressure decreases and they start to develop extensive bruising. Which dual failure in physiological systems best explains these clinical observations?
Reduced platelet function and impaired lymphatic drainage
Bruising means blood leaks into tissues and does not clot quickly, which points to poor platelet function (platelets start clotting).
The lymphatic system returns tissue fluid to the blood. If lymphatic drainage is impaired, less fluid returns to the circulation and blood volume, and so blood pressure, falls.
Enhanced lymph flow, more platelet aggregation or a higher red cell count would not produce these signs.
Hence, the answer is Reduced platelet function and impaired lymphatic drainage.
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