High Dependency Obstetric Nursing
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Direct answer
Between the labour room and the intensive care unit lies a thin band of care where many Indian maternal deaths are either prevented or missed — the obstetric high dependency unit. Women with severe pre-eclampsia or eclampsia, HELLP syndrome, stabilised postpartum haemorrhage, puerperal sepsis, cardiac disease in pregnancy or severe anaemia are monitored here with hourly observations, sometimes invasive lines, and protocolised therapy before deterioration demands an ICU bed. The nursing spine of the unit is the Pritchard magnesium sulphate regimen with its three safety checks, the Modified Early Obstetric Warning Score that converts observations into escalation, restricted fluids in pre-eclampsia, and honest recognition of the triggers that mandate ICU transfer. Programmes such as LaQshya and maternal death surveillance reviews exist precisely to standardise this tier of care.
What you must remember
- Typical admissions: severe pre-eclampsia and eclampsia, HELLP, massive PPH after stabilisation, obstetric sepsis, heart disease in pregnancy (rheumatic valve disease remains common in India), and severe anaemia with failure signs.
- Pritchard regimen: magnesium sulphate 4 g of 20 per cent solution intravenously plus 10 g of 50 per cent solution intramuscularly (5 g each buttock), then 5 g intramuscularly every four hours; the Zuspan alternative is 4 g loading with a 1-2 g/hour infusion.
- MgSO4 monitoring trio before every dose: patellar reflexes present, respiratory rate at least 16 per minute, urine output at least 30 mL/hour; the antidote is 10 per cent calcium gluconate 10 mL intravenously, kept at the bedside.
- Toxicity ladder: reflexes disappear first, then respiratory rate falls, then cardiac arrest — magnesium toxicity is read clinically through this ladder, not only through the lab.
- MEOWS charting: respiratory rate, saturation, blood pressure, pulse, temperature, conscious level and urine output scored on colour bands; one red or two yellow parameters trigger immediate senior review.
- Fluid discipline in severe pre-eclampsia: maintenance commonly restricted to around 80 mL/hour, because the injured kidney cannot excrete excess and pulmonary oedema follows.
- ICU transfer triggers: ventilation or refractory hypoxaemia, escalating vasopressors, uncontrolled bleeding or coagulopathy, coma, or the need for renal replacement.
A night in the obstetric HDU
A 26-year-old primigravida at 34 weeks is shifted in with a blood pressure of 170/115, proteinuria, headache and clonus. The nurse runs the sequence: baseline MEOWS, intravenous access, the loading dose drawn up exactly — 4 g of 20 per cent solution into the drip, 10 g of 50 per cent deep intramuscular in divided buttocks — and the maintenance clock set at every four hours. Before each 5 g dose the trio is checked and charted: reflexes present, respiratory rate 18, urine 45 mL this hour. Fluids run at 80 mL/hour, no matter how thirsty she feels; the hourly urine measure and pulse oximeter are her kidneys' early-warning system.
Two hours later she seizes despite magnesium — airway protected sideways, oxygen applied, seizure timed, senior informed, a second magnesium bolus prepared. She is delivered by caesarean at dawn; magnesium continues 24 hours after delivery or the last fit, calcium gluconate still in the tray, MEOWS watched until every band is green.
How the viva is framed
The most reliable viva question is the dose — "Pritchard regimen?" — 4 g IV plus 10 g IM loading, 5 g IM four-hourly, and candidates who blur Zuspan's infusion numbers into it lose the mark. The second is the pre-dose trio, followed by "what appears first in toxicity?" — loss of reflexes. Indian examiners also press the level-of-care distinction: HDU means one-to-two hourly observation and single-organ support short of ventilation, and "any sick mother" without criteria suggests the candidate has never seen the unit. A subtle favourite is why fluids are restricted in pre-eclampsia — the answer runs through falling glomerular filtration, capillary leak and iatrogenic pulmonary oedema, and tying restriction to the hourly urine chart rather than reciting a number demonstrates understanding.
Frequently asked questions
What is the Pritchard regimen of magnesium sulphate?
Loading with 4 g of 20 per cent solution intravenously plus 10 g of 50 per cent solution intramuscularly in divided buttocks, then 5 g intramuscularly every four hours, continued 24 hours after delivery or the last seizure.
What must be checked before each maintenance MgSO4 dose?
Patellar reflexes present, respiratory rate at least 16 per minute and urine output at least 30 mL/hour; absent reflexes or falling respiration means hold the drug and escalate.
What is the antidote for magnesium toxicity and its dose?
Ten per cent calcium gluconate 10 mL intravenously over 5-10 minutes, pre-stocked at the bedside of every woman on magnesium therapy.
What parameters does a MEOWS chart score?
Respiratory rate, oxygen saturation, blood pressure, pulse, temperature, conscious level and urine output, banded so that one red or two yellow scores mandate urgent review.
When should a woman in the obstetric HDU be transferred to the ICU?
When she needs ventilation or has refractory hypoxaemia, escalating vasopressors, uncontrolled haemorrhage or coagulopathy, coma, or renal replacement therapy.