Over the 1990s, but increased by 67% from

the past two decades, the rate of maternal chronic hypertension has nearly
doubled in the United States. The rate of maternal chronic hypertension
increased only by 16% during the 1990s, but increased by 67% from 2000 to 2009,
largely secondary to the obesity epidemic and the increase in maternal age.
Rates of chronic hypertension have increased for all racial and Hispanic
ethnicity groups, with the largest increase among non-Hispanic black women (by
87%) and lowest among Asian Pacific Islanders. The 2011 National Vital
Statistic Report reported an increased incidence of chronic hypertension in all
pregnant women from 11.9 in 2008 to 12.7 per 1000 in 2009. The rates of chronic
hypertension were also noted to increase steadily with age, whereas rates of gestational
hypertension were stable for women under 40 years but increased sharply after
age 40.(16) Approximately
300,000 deliveries reported that severe maternal morbidity was associated with
hypertensive disorders of pregnancy in the United States.(17) Rural–urban and
marked geographic variation were found with rates for pre-eclampsia ranging
from as low as 33% (Haryana) to 87.5% (Tripura).(18)
The global prevalences of HDP,
gestational hypertension and preeclampsia are 5.2–8.2%, 1.8–4.4% and 0.2–9.2%,
respectively.(19) According to
region, the prevalence of PREECLAMPSIAis0.5–2.3% in Africa, 0.2–6.7% in Asia,
2.8–9.2% in Oceania, 2.8–5.2% in Europe, 2.6–4.0% in North America and 1.8–7.7%
in South America and the Caribbean.(19)

study conducted in 2014 showed results that among the 1694 delivery cases examined, 173 cases had hypertension (9.8%).
Among these, 75 (45%) had gestational hypertension; 24 (14.8%) had
preeclampsia-eclampsia; 30 (18%) had preeclampsia superimposed on chronic
hypertension; 21 (13.5%) cases had chronic hypertension; and 13 (8%) had
pregnancy-aggravated chronic hypertension. Ninety-six point three percent
(96.3%) had a systolic blood pressure (BP) of 140 – 190 mmHg, and 3.7% had a
systolic BP greater than 190 mmHg. Whereas 61.1% of diastolic blood pressure 90
– 110 mmHg and 38.9% of the mothers had diastolic BP greater than 110 mmHg. The
HELLP (Hemolysis, Elevated Liver enzymes & Low Platelet count) syndrome was
present in 4.9% of cases; 52.6% experienced premature delivery; 7.4% had IUFD
(intra uterine fetal death); 9.9% had IUGR (intrauterine growth retardation);
and 17.3% had LBW babies.(20)

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