David Drummond, a 66 year male is recovering from bowel surgery in hospital. On day three he develops tenderness, pain a

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David Drummond, a 66 year male is recovering from bowel surgery
in hospital. On day three he develops tenderness, pain and warmth
in his right calf.
His doctor determines that he has developed thrombophlebitis and
orders:
bed rest
continuous heat application to the right calf
initiation of IV access followed by an IV bolus of 5000 units
heparin sodium, then infuse heparin sodium at 950 units/hour
continuously.
partial thromboplastin time before starting heparin sodium and
daily thereafter.
Given your knowledge of this medication, why is a bolus
dose required prior to commencing the heparin infusion?
(Note: Your answer should take into consider David's medical
history and all medication received. Remember to incorporate latest
evidence based practice in your answer)