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Non-dipper hypertension is associated with slow coronary flow among hypertensives with normal coronary angiogram

Ercan Aksit1, Erdal Gursul1, Fatih Aydin2

  • 1Department of Cardiology, Biga State Hospital, Canakkale, Turkey.

Cardiovascular Journal of Africa
|May 14, 2016
PubMed

Insights

Hypertensive non-dippers, patients with a smaller drop in nocturnal blood pressure, exhibit higher Thrombolysis in Myocardial Infarction (TIMI) frame counts, indicating microvascular dysfunction, compared to dippers. This suggests increased cardiovascular risk in non-dipper hypertensive individuals.

Area of Science:

  • Cardiology
  • Hypertension Research
  • Vascular Biology

Background:

  • Hypertension is a major risk factor for cardiovascular disease.
  • Nocturnal blood pressure dipping patterns, specifically the 'dipper' and 'non-dipper' classifications, are associated with cardiovascular outcomes.
  • Microvascular function, assessed by Thrombolysis in Myocardial Infarction (TIMI) frame count, plays a crucial role in cardiovascular health.

Purpose of the Study:

  • To compare the microvascular function, using TIMI frame count, between dipper and non-dipper hypertensive patients with normal coronary arteries.
  • To investigate the relationship between nocturnal blood pressure dipping status and coronary microvascular impairment in hypertensive individuals.

Main Methods:

  • A retrospective study involving 60 hypertensive patients with normal coronary arteries.
  • Patients were categorized into dipper (n=30) and non-dipper (n=30) groups based on ambulatory blood pressure monitoring.
  • Coronary microvascular function was assessed using TIMI frame counts in all major coronary arteries.

Main Results:

  • Non-dipper hypertensives showed significantly higher TIMI frame counts in all coronary arteries and mean TIMI frame count compared to dipper hypertensives (p < 0.001).
  • Body Mass Index (BMI) was significantly higher in the non-dipper group (25.47 ± 2.92 kg/m²) than in the dipper group (23.79 ± 2.81 kg/m², p = 0.027).

Conclusions:

  • TIMI frame count, a reliable indicator of microvascular changes, is elevated in non-dipper hypertensive patients.
  • Non-dipper status in hypertension is associated with impaired coronary microvascular function, suggesting a higher risk profile.
Abstract

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