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Preeclampsia (hypertension while pregnant) varies with season (O.R. 0.57) – June 2021

Antenatal Exposure to UV-B Radiation and Preeclampsia: A Retrospective Cohort Study

J Am Heart Assoc . 2021 Jun 22;e020246. doi: 10.1161/JAHA.120.020246
Claire E Hastie 1, Daniel F Mackay 1, Tom L Clemens 2, Mark P C Cherrie 2, Lauren J Megaw 3, Gordon C S Smith 4, Sarah J Stock 5, Chris Dibben 6, Jill P Pell 1


This study recommends decreasing preeclampsia by adding UVB in low seasons
The following studies indicate that adding vitamin D and vitamin D Receptor activators might be much easier and more effective

Items in both categories Pregnancy and Hypertension are listed here:

Hypertension category listing contains the following

146 items in the category HYPERTENSION

see also
Overview Overview Hypertension and Vitamin D
Overview Cardiovascular and vitamin D
Overview Stroke and vitamin D
Incidence of 22 health problems related to vitamin D have doubled in a decade
Some interesting Hypertension studies

The risk of 44 diseases at least double with poor Vitamin D Receptor as of Oct 2019

Vitamin D Receptor activation can be increased by any of: Resveratrol,  Omega-3,  MagnesiumZinc,   Quercetin,   non-daily Vit D,  Curcumin, intense exercise,   Ginger,   Essential oils, etc  Note: The founder of VitaminDWiki uses 10 of the 12 known VDR activators

Pregnancy category starts with

813 items in Pregnancy category

 - see also

Healthy pregnancies need lots of vitamin D has the following summary

0. Chance of not conceiving3.4 times Observe
1. Miscarriage 2.5 times Observe
2. Pre-eclampsia 3.6 timesRCT
3. Gestational Diabetes 3 times RCT
4. Good 2nd trimester sleep quality 3.5 times Observe
5. Premature birth 2 times RCT
6. C-section - unplanned 1.6 timesObserve
     Stillbirth - OMEGA-3 4 timesRCT - Omega-3
7. Depression AFTER pregnancy 1.4 times RCT
8. Small for Gestational Age 1.6 times meta-analysis
9. Infant height, weight, head size
     within normal limits
10. Childhood Wheezing 1.3 times RCT
11. Additional child is Autistic 4 times Intervention
12.Young adult Multiple Sclerosis 1.9 timesObserve
13. Preeclampsia in young adult 3.5 timesRCT
14. Good motor skills @ age 31.4 times Observe
15. Childhood Mite allergy 5 times RCT
16. Childhood Respiratory Tract visits 2.5 times RCT

RCT = Randomized Controlled Trial

Background Risk of preeclampsia varies by month of delivery. We tested whether this seasonal patterning may be mediated through maternal vitamin D concentration using antenatal exposure to UV-B radiation as an instrumental variable.

Methods and Results Scottish maternity records were linked to antenatal UV-B exposure derived from satellites between 2000 and 2010. Logistic regression analyses were used to explore the association between UV-B and preeclampsia, adjusting for the potential confounding effects of month of conception, child's sex, gestation, parity, and mean monthly temperature. Of the 522 896 eligible singleton deliveries, 8689 (1.66%) mothers developed preeclampsia. Total antenatal UV-B exposure ranged from 43.18 to 101.11 kJ/m2 and was associated with reduced risk of preeclampsia with evidence of a dose-response relationship (highest quintile of exposure: adjusted odds ratio, 0.57; 95% CI, 0.44-0.72; P<0.001). Associations were demonstrated for UV-B exposure in all 3 trimesters.

Conclusions The seasonal patterning of preeclampsia may be mediated through low maternal vitamin D concentration in winter resulting from low UV-B radiation. Interventional studies are required to determine whether vitamin D supplements or UV-B-emitting light boxes can reduce the seasonal patterning of preeclampsia.

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