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1998 Fiscal Year Final Research Report Summary

Role of parasympathetic nervous system and endothelium-derived relaxing factor on hypotension during tooth extraction

Research Project

Project/Area Number 09672061
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Surgical dentistry
Research InstitutionKyushu Dental College

Principal Investigator

TAKATA Yutaka  Kyushu Dental College, Department of Dentistry, Professor, 歯学部, 教授 (40163208)

Co-Investigator(Kenkyū-buntansha) MATSUMURA Kiyoshi  Kyushu Dental College, Department of Dentistry, Lecturer, 歯学部, 講師 (70285469)
Project Period (FY) 1997 – 1998
Keywordsdental / tooth extraction / blood pressure / sympathetic nervous system / parasympathetic nervous system / aging / spectral analysis / hypertension
Research Abstract

To evaluate the role of parasympathetic nervous system and endothelium- derived relaxing factor on hypotension during dental extraction, we have measured the changes in blood pressure (BP), pulse rate, and heart rate variability in young and old patients (study 1) as well as in normotensive and hypertensive subjects (study 2). The study included 20 young, 20 old subjects (study 1), 18 essential hypertensives and age and sex matched 18 normotensive controls (study 2) who underwent tooth extraction at our hospital. Holter electrocardiographic monitoring was used to determine the power spectrum of R-R variability before and during dental surgery. The low frequency (LF : 0.041 to 0.140 Hz), high frequency (HF : 0.140 to 0.500 Hz), and total spectral powers (TF : 0.000 to 4.000 Hz) were calculated, and the ratio of LF to HF and percentage of HF relative to TF(%HF : HF/TF x 100) were used as indexes of sympathetic and parasympathetic activities, respectively. The blood was also drawn in volu … More nteer during dental extraction to measure blood NO_x and catecholamines concentrations (study 3).
Studyl : The baseline BP for study 1 subjects was 121/70 mmHg, Local anesthetic lidocaine containing epinephrine (1 : 80000) increased BP, which was further increased up to 132/173 mmHg during dental extraction. The BP elevation was prominent in subjects older than 40 years old. The percent HF was suppressed by local anesthetic injection in younger patients, while LF/ HF was enhanced in young subjects but suppressed in old subjects during local anesthesia. Study 2 : The resting BP was 149/ 85mmHg for hypertensive patients, which was significantly higher than that for normotensive patients (119/71 mmHg). The baseline pulse rate was similar in both groups. BP increased during tooth extraction in both groups ; however, changes in BP did not differ between two groups. Administration of local anesthetic significantly decreased the %HF in normotensive patients In contrast, the LF/HF significantly decreased during the administration of local anesthesia and tooth extraction in hypertensive patients. Study 3 : Dental surgery increased blood concentrations of adrenaline and noradrenaline, but did not change the concentration of NO_x.
These results showed that pressor response induced by tooth extraction was greater in older subjects than in younger subjects, while it was similar between normotensive and hypertensive patients. Cardiac parasympathetic and sympathetic nervous systems during dental surgery may be different between young and old subjects, and also differ in normotensive subjects and hypertensive patients. Endothelium- derived relaxing factor as NO_s may not play major roles on BP changes during dental treatment. Both hypertension and aging might suppress increases in sympathetic activity induced by dental surgery. Less

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Matsumura K, Miura K, Takata Y, Kurokawa H, Kajiyama M, Abe I, Fujishima M: "Changes in blood pressure and heart rate variability during dental surgery." Am J Hypertens. 11・11. 1376-1380 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takata Y, Tateishi A, Kurokawa H, Fujikawa M, Wakisaka M, Matsumura K, Nakamura Y, Fukuda J, Kajiyama M: "Hepatitis virus infection and hepatic disease in hospitalized dental patients." J Kyushu Dent Soc. 52・5. 567-575 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takata Y, Tateishi A, Kurokawa H, Fujikawa M, Matsumura K, Wakisaka M, Fukuda J, Kajiyama M: "Hepatitis G virus infection in a high-risk subgroup of hospitalized dental patients." Oral Surg Oral Med Oral Pathol. 87・(in press). (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Matsumura K, Miura K, Takata Y, Kurokawa H, Kajiyama M, Abe I, Fujishima M: "Changes in blood pressure and heart rate variability during dental surgery." Am J Hypertens. 11(11). 1376-1380 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takata Y, Tateishi A, Kurokawa H, Fujikawa M, Wakisaka M, Matsumura K, Nakamura Y, Fukuda J, Kajiyama M: "Hepatitis virus infection and hepatic disease in hospitalized dental patients." J Kyushu Dent Soc. 52(5). 567-575 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takata Y, Tateishi A, Kurokawa H, Fujikawa M, Matsumura K, Wakisaka M, Fukuda J, Kajiyama M: "Hepatitis G virus infection in a high-risk subgroup of hospitalized dental patients." Oral Surg Oral Med Oral Pathol. 87 (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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