I have no idea about research, but my mentor taught me a good little ermm wats the word 'saying' i suppose to remember what to look for with PPH's.. The 4 T's... Tone, Trauma, Tissue, Thrombin..
Tone - Uterus tone..
Trauma - to the cervix or perineum
Tissue - Placenta or retained products
Thrombin - The womans ability to clot

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Duel X
3rd Year!
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