title: Changes of the carotid artery Doppler flow velocity pattern after sublingual nitroglycerin in patients with hypertension.
abstract: OBJECTIVE
  To evaluate the applicability of carotid Doppler echography for the assessment of changes of peripheral hemodynamics in the hypertensives.
  
  
  METHODS
  28 hypertensives (17 males, 11 females), mean age of 64 yrs and 40 normal controls (24 males, 16 females) mean age of 49 yrs.
  
  
  METHODS
  We recorded the right common carotid arterial Doppler flow velocity (BFV) pattern and measured the peak velocities of the percussion wave (P) and late rising tidal wave (T), the ratio of the two (P/T), the time interval between the two peaks corrected by heart rate (P-Tc), systolic flow velocity integral (FVI) and carotid artery diameter (CAD) before and after 0.4 mg dose of subligual nitroglycerin (NTG).
  
  
  RESULTS
  1) In hypertensives, the P wave velocity showed lower and P-Tc interval shorter than those of the normal controls at baseline. 2) After NTG, the P-Tc and P/T increased, but the T and FVI decreased significantly in both groups of subjects. 3) The P/T ratio was less significantly increased after NTG in the hypertensives than in the controls. These results suggest that NTG might have been involved in concomitant reduction and delay of the wave reflection from the peripheral vessels, preferentially in the normal subjects than in hypertensives.
  
  
  CONCLUSIONS
  The carotid Doppler echography can be useful for the evaluation of the changes of hemodynamics in the peripheral vessel such as carotid artery in hypertensive subjects.
authors.affiliation: Division of Cardiology, Wonkwang University School of Medicine, Iksan, Korea.
authors.forename: J W
authors.initials: JW
authors.lastname: Jeong
authors.forename: O K
authors.initials: OK
authors.lastname: Park
authors.forename: Y K
authors.initials: YK
authors.lastname: Park
authors.forename: C
authors.initials: C
authors.lastname: Tei
authors.forename: N
authors.initials: N
authors.lastname: Tanaka
mesh_terms: D000286:Administration, Sublingual; D001783:Blood Flow Velocity / Q000187:drug effects; D002339:Carotid Arteries / Q000000981:diagnostic imaging / Q000187:drug effects; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D006973:Hypertension / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D005996:Nitroglycerin / Q000008:administration & dosage*; D018615:Ultrasonography, Doppler, Color; D014665:Vasodilator Agents / Q000008:administration & dosage*
chemical_list: D014665:Vasodilator Agents; D005996:Nitroglycerin