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Relationship between a genetic predisposition to hypertension, blood pressure levels and pain sensitivity
Luigina Guasti1, Giovanni Gaudio, Danilo Zanotta
1Chair of Internal Medicine, Department of Clinical and Biological Sciences, Faculty of Medicine, University of Insubria, Viale Borri 57, Varese, Italy.
Insights
Hypertension is linked to reduced pain perception, with higher blood pressure correlating with increased pain tolerance. Genetic predisposition to hypertension does not independently influence pain sensitivity.
Area of Science:
- Cardiovascular Physiology
- Pain Perception Research
- Hypertension Studies
Background:
- The relationship between hypertension and pain perception is not fully understood.
- Investigating the roles of blood pressure elevation and genetic predisposition in altered pain perception among hypertensive individuals.
Purpose of the Study:
- To determine if blood pressure levels or genetic predisposition to hypertension influence reduced pain perception in hypertensive patients.
- To elucidate the mechanisms underlying the connection between elevated blood pressure and pain perception.
Main Methods:
- Evaluated 104 untreated hypertensive patients and 42 normotensive controls.
- Assessed standard blood pressure, 24-hour blood pressure monitoring, and dental pain perception.
- Utilized 2x2 ANOVA and covariate analysis to assess effects of blood pressure status and family history.
Main Results:
- Hypertensive subjects exhibited higher pain threshold and tolerance compared to normotensive subjects (P < 0.0001 and P < 0.015).
- Significant positive correlations were observed between 24-hour blood pressure (systolic and diastolic) and pain perception variables.
- Blood pressure status significantly affected pain sensitivity, while family history of hypertension did not, after controlling for blood pressure.
Conclusions:
- Pain sensitivity is directly correlated with blood pressure levels.
- Genetic predisposition to hypertension alone does not alter pain perception patterns.
- The degree of blood pressure elevation, rather than genetic factors, appears to influence hypalgesia in hypertension.
Introduction:
The aim of this study was to determine whether the degree of blood pressure elevation and/or a genetic predisposition to hypertension have a major role in determining a reduced pain perception in hypertensives. The reasons underlying the relationship between blood pressure elevation and pain perception mechanisms are not completely understood.
Methods:
One hundred and four untreated hypertensive patients (65 subjects with and 39 without a positive parental history of hypertension) together with a control group of 42 subjects (20 normotensive offspring of normotensive parents, and 22 normotensive offspring of hypertensive parents) were submitted to standard blood pressure evaluation, 24-h blood pressure monitoring and dental pain perception evaluation.
Results:
Both pain threshold and tolerance were found to be higher in hypertensive than normotensive subjects (P < 0.0001 and P < 0.015, respectively). Positive significant correlations were found between both 24-h systolic and diastolic pressure and the pain perception variables. When a 2 x 2 ANOVA test was performed, factoring for the effects of both blood pressure status and family history of hypertension on pain sensitivity, a significant effect was revealed only for blood pressure status. Moreover, after controlling for blood pressure by a covariate analysis, no significant difference was found between the subjects with or without hypertensive parents as regards pain perception variables.
Conclusions:
Pain sensitivity is correlated to blood pressure levels whereas the parental history of hypertension per se does not affect the pain perception pattern. Thus, the degree of blood pressure elevation, more than a genetic predisposition to hypertension may influence the mechanisms leading to hypalgesia in hypertension.