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Hypotension in small preterms: what does it mean?

Manuel R G Carrapato^1,2, Teresa Andrade¹, Teresa Caldeira¹

¹São Sebastião Hospital , Santa Maria Feira , Portugal.

The Journal of Maternal-Fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians

|June 1, 2018

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Hypotension in preterm infants is complex. Many extremely premature babies with low blood pressure show no signs of poor organ function, suggesting a need for less aggressive, individualized treatment protocols.

Area of Science:

Neonatalogy
Pediatric Cardiology
Perinatal Medicine

Background:

Preterm infants, particularly those with extremely low gestational age (ELGA) and extremely low birth weight (ELBW), frequently exhibit low blood pressure readings in early neonatal life.
The definition of hypotension and the optimal management strategy, balancing aggressive intervention against potential medication side effects and the risks of undertreatment, remain debated.
Current clinical decisions regarding hypotension management in neonates often rely on individual judgment rather than standardized evidence-based protocols.

Purpose of the Study:

To investigate the prevalence of hypotension and its clinical significance in extremely preterm infants.
To evaluate current management practices for hypotension in this vulnerable population.
To propose a refined approach to managing hypotension in preterm neonates, emphasizing individualized care and permissive strategies.

Keywords:

Definitions of hypotension MAP recordings clinical hypotension permissive hypotension

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Main Methods:

Retrospective analysis of clinical data from live preterm infants born between 23 0/7 and 31 6/7 weeks gestational age.
Data were collected from two distinct periods (2000-2004 and 2008-2012) to assess changes or consistencies in management.
Assessment included mean arterial pressure (MAP) readings, clinical signs of impaired perfusion, and organ-specific assessments (e.g., cerebral Doppler, cardiac output).

Main Results:

Nearly half of ELGA/ELBW neonates did not present with low MAP or clinical indicators of hypoperfusion, despite initial low blood pressure readings.
Treatment decisions for hypotension were often individualized, lacking consistent application of evidence-based guidelines.
Variability in treatment approaches was observed between the two study periods.

Conclusions:

A significant proportion of preterm infants with low blood pressure readings may not require aggressive intervention, especially in the absence of clinical signs of hypoperfusion.
Management of persistent hypotension should consider the overall clinical picture, including evidence of organ dysfunction, and utilize least aggressive measures within flexible protocols.
The concept of 'permissive hypotension' is supported for transient episodes without signs of hypoperfusion, normal cardiac output, and normal cerebral blood flow, warranting further investigation into the long-term outcomes of treated versus untreated hypotension.