Blood pressure reference ranges
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Blood Pressure Reference Ranges in Pregnancy
Blood pressure reference ranges during pregnancy change as gestation progresses. In normal pregnancies, systolic blood pressure (SBP) and diastolic blood pressure (DBP) are typically lower in early pregnancy and rise slightly towards term. For example, at 12 weeks, SBP/DBP averages around 112/65 mmHg for nulliparous women, increasing to about 116/70 mmHg at 37 weeks. Multiparous women tend to have slightly lower values. These ranges can also be influenced by maternal factors such as prepregnancy BMI, smoking status, and parity, with higher BMI linked to higher blood pressure and smokers having lower readings. Reference ranges are also slightly different across populations, but generally, SBP ranges from about 94–119 mmHg at 12 weeks to 97–125 mmHg at 37 weeks, and DBP from about 59–74 mmHg at 12 weeks to 59–78 mmHg at 37 weeks. These findings highlight the importance of using gestational-age-specific and population-specific reference ranges to identify abnormal blood pressure patterns in pregnancy 128.
Blood Pressure Reference Ranges in Children and Adolescents
For children and adolescents, blood pressure reference ranges are determined by age, sex, and height. Normal blood pressure is defined by percentiles, with high normal blood pressure between the 90th and 95th percentiles and hypertension at or above the 95th percentile for age and gender. International reference values have been established for nonoverweight children aged 6–17 years, showing that blood pressure is similar between boys and girls until age 13, after which boys tend to have higher values. These references allow for better identification of elevated blood pressure in diverse populations and facilitate international comparisons 3610.
Blood Pressure Reference Ranges in Neonates and Very Low Birthweight Infants
In very low birthweight infants, mean blood pressure (MBP) increases with birthweight and postnatal age, with a slight decrease observed on days 6 and 7 of life. Reference ranges for MBP are important for assessing risk of complications such as intraventricular hemorrhage, which is associated with low and variable MBP. These ranges help clinicians determine appropriate blood pressure targets for this vulnerable group .
Ambulatory and Anesthesia Blood Pressure Reference Ranges
For adults, 24-hour ambulatory blood pressure monitoring (ABP) reference values associated with the best prognosis are 120–133 mmHg for systolic and 65–78 mmHg for diastolic blood pressure. Values outside this range are linked to increased mortality risk. In children under anesthesia, mean noninvasive blood pressure (NIBP) varies from 33 mmHg at birth to 67 mmHg at 18 years, with lower cutoffs ranging from 17 mmHg at birth to 47 mmHg at 18 years. These reference ranges are useful for monitoring and managing blood pressure during surgical procedures 57.
Adult Blood Pressure Reference Ranges and Risk Assessment
Traditionally, normal adult blood pressure has been defined as less than 140/90 mmHg. However, evidence suggests that lowering the upper limit for systolic blood pressure to less than 130 mmHg improves risk assessment for mortality, identifying individuals at lower risk more effectively while still including a large portion of the population .
Conclusion
Blood pressure reference ranges vary by age, sex, gestational age, and specific populations such as pregnant women, children, and neonates. Using appropriate, population-specific reference ranges is essential for accurate diagnosis, risk assessment, and management of blood pressure-related health risks across the lifespan 1234+6 MORE.
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