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Letters to the Editor

Increased Blood Pressure Variability in Aging Rats After Intrauterine Growth Restriction

Michiel F. Schreuder, Joanna A.E. van Wijk, Henriette A. Delemarre-van de Waal
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https://doi.org/10.1161/HYPERTENSIONAHA.107.099994
Hypertension. 2007;50:e158
Originally published October 17, 2007
Michiel F. Schreuder
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Joanna A.E. van Wijk
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Henriette A. Delemarre-van de Waal
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To the Editor:

To determine which aspect of blood pressure is associated the most with end-organ damage, several parameters are used like average blood pressure, pulse pressure, and blood pressure variability. In a recent article, Tatasciore et al1 showed that blood pressure variability is more closely associated with cardiovascular damage than mean blood pressure levels.

An increased blood pressure and a higher incidence of cardiovascular diseases are frequently described after intrauterine growth restriction (IUGR).2 It has also been shown that blood pressure variability is highest in children with the lowest birth weights.3 However, data during aging on blood pressure variability after IUGR are lacking.

We have shown previously that IUGR in a rat model of uteroplacental dysfunction based on uterine artery ligation leads to an increase in blood pressure and pulse pressure in aging rats.4 We used telemetry to acquire these longitudinal data, because this allowed for measurements in conscious and freely moving animals. To address the issue of aging and blood pressure variability after IUGR, we restudied our data on the nighttime blood pressure and heart rate in this previously described group of male animals at the ages of 6 and 12 months.4 It has been shown previously in rats, as well, that blood pressure variability is a more critical determinant of cardiovascular damage rather than the blood pressure levels.5 The variability in blood pressure and heart rate was defined as the SD of the respective parameter during the 12-hour period of measurement, during which 1 value was stored every 6 minutes. To use unstressed, ie, undisturbed by humans, and awake data in the nocturnal rat, we used nighttime data only.

The Table shows the data on the cardiovascular variability at the 2 ages studied and demonstrates that diastolic and systolic blood pressure variability are highly significantly increased in 12-month-old IUGR animals (mean difference in diastolic blood pressure variability: 1.41 mm Hg; 95% CI: 0.88 to 1.94 mm Hg; mean difference in systolic blood pressure variability: 1.69 mm Hg; 95% CI: 1.12 to 2.25 mm Hg). Linear regression between birth weight and diastolic and systolic blood pressure variability showed highly significant negative associations at the age of 12 months (r=−0.59 and P=0.005 and r=−0.59 and P=0.005 for diastolic and systolic blood pressure variability, respectively).

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Table. Blood Pressure and Heart Rate Variability

We conclude that IUGR increases blood pressure variability in aging animals, which may, in part, explain the higher prevalence in end-organ damage and cardiovascular disease that is associated with IUGR. It may, therefore, be of interest to study blood pressure variability in adult IUGR individuals.

Acknowledgments

Disclosures

None.

References

  1. ↵
    Tatasciore A, Renda G, Zimarino M, Soccio M, Bilo G, Parati G, Schillaci G, De Caterina R. Awake systolic blood pressure variability correlates with target-organ damage in hypertensive subjects. Hypertension. 2007; 50: 325–332.
    OpenUrlAbstract/FREE Full Text
  2. ↵
    Barker DJ. Adult consequences of fetal growth restriction. Clin Obstet Gynecol. 2006; 49: 270–283.
    OpenUrlCrossRefPubMed
  3. ↵
    Lurbe E, Torro I, Rodriguez C, Alvarez V, Redon J. Birth weight influences blood pressure values and variability in children and adolescents. Hypertension. 2001; 38: 389–393.
    OpenUrlAbstract/FREE Full Text
  4. ↵
    Schreuder MF, van Wijk JA, Delemarre-van de Waal HA. Intrauterine growth restriction increases blood pressure and central pulse pressure measured with telemetry in aging rats. J Hypertens. 2006; 24: 1337–1343.
    OpenUrlPubMed
  5. ↵
    Miao CY, Xie HH, Zhan LS, Su DF. Blood pressure variability is more important than blood pressure level in determination of end-organ damage in rats. J Hypertens. 2006; 24: 1125–1135.
    OpenUrlPubMed
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November 2007, Volume 50, Issue 5
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    Increased Blood Pressure Variability in Aging Rats After Intrauterine Growth Restriction
    Michiel F. Schreuder, Joanna A.E. van Wijk and Henriette A. Delemarre-van de Waal
    Hypertension. 2007;50:e158, originally published October 17, 2007
    https://doi.org/10.1161/HYPERTENSIONAHA.107.099994

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    Increased Blood Pressure Variability in Aging Rats After Intrauterine Growth Restriction
    Michiel F. Schreuder, Joanna A.E. van Wijk and Henriette A. Delemarre-van de Waal
    Hypertension. 2007;50:e158, originally published October 17, 2007
    https://doi.org/10.1161/HYPERTENSIONAHA.107.099994
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