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Effect of Amezinium Metilsulfate on the Finger Skin Vasoconstrictor Response to Cold Stimulation and Venoconstrictor Response to Noradrenaline

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Effect of Amezinium Metilsulfate on the Finger Skin Vasoconstrictor Response to Cold Stimulation and Venoconstrictor Response to Noradrenaline Jpn Circ J 1998; 62: 824–828 Effect of Amezinium Metilsulfate on the Finger Skin Vasoconstrictor Response to Cold Stimulation and Venoconstrictor Response to Noradrenaline Kazuhiro Harada, MD; Masami Ohmori, MD; Akio Fujimura, MD; Kyoichi Ohashi, MD* Orthostatic hypotension can be caused by an inadequate vasoconstrictor response. The effects of amezinium on vasoconstrictor response to sympathetic stimulation and to exogenous noradrenaline were investigated and compared with those of midodrine. In 8 healthy men, the following experiments were performed after a single oral dose of 10 mg of amezinium, 2 mg of midodrine or a placebo. First, finger-tip blood flow (FTBF) was recorded using a laser Doppler flowmeter before and during the contralateral hand cooling and a reduction ratio of FTBF was calculated as an index of the vasoconstrictor response. Second, dose-response curves to increasing doses (1–512ng/min) of noradrenaline infused locally to the dorsal hand vein were determined using a linear variable differential transformer. The reduction ratio of FTBF was significantly increased (p<0.05) by amezi- mium [placebo, 75.9±9.8(mean±SD)%; amezinium, 85.1±7.9%; midodrine, 78.1±9.3%]. The infusion rate of noradrenaline producing a half-maximum venoconstriction was significantly decreased (p<0.05) by amezinium (placebo, 40.6±33.9ng/min; amezinium, 21.0±21.3ng/min; midodrine, 33.2±31.5ng/min). These findings indi- cate that amezinium increases the vasoconstrictor response to sympathetic stimulation and to noradrenaline in normal subjects, and this mechanism might contribute to the improvement by amezinium of the symptoms of orthostatic hypotension. (Jpn Circ J 1998; 62: 824–828) Key Words: Amezinium; Dorsal hand vein method; Laser Doppler, Midodrine; Vasoconstrictor response hen a person assumes an upright posture, an methods were thought to be suitable and were used in the increase of sympathetic outflow and an inhibi- present study, because they are sensitive and noninvasive W tion of parasympathetic activity occur re- and are used for the evaluation of autonomic disturbances flexly,1,2 which increases the heart rate and vascular resis- or orthostatic hypotension. First, the finger-tip vasocon- tance in order to maintain systemic blood pressure. strictor response to cold stimulation on the contralateral Orthostatic hypotension may be caused by failure of these hand was examined using a laser Doppler flowmeter, which responses,3,4 and for the treatment it is important to select a is an appropriate means for the study of the vasomotor drug considering its pharmacological properties and the response mediated byα-adrenoceptor stimulation.7,8 Second, pathophysiology of the disease. At present, vasoconsticting the venoconstrictor response to locally infused noradrena- agents are often used for the treatment of orthostatic line was examined using a linear variable differential trans- hypotension. To understand the mechanism of these drugs, former (LVDT), which provides a sensitive and easy repro- their effects not only on systemic blood pressure but also ducible means of assessing the effect of a drug on periph- on the vasoconstrictor response to sympathetic stimulation eral veins.9 As the decrease in venous blood return to the should be examined. However, to our knowledge, such heart is involved in the pathogenesis of orthostatic information is limited. hypotension,3 it is interesting to also examine the effect of Amezinium metilsulfate (amezinium) is one of the most these drugs on veins. popular drugs in Japan for the treatment of orthostatic In the present study, we examined, using these methods, hypotension. Amezinium has a unique mechanism of vaso- the effects of amezinium on the vasoconstrictor responses, constriction; that is, it inhibits monoamine oxidase (MAO) and compared them in healthy subjects with those of activity and uptake of noradrenaline,5,6 which prompted us midodrine hydrochloride (midodrine), anα1-adrenoceptor to examine whether it influences the vasoconstrictor agonist,10 which is also a popular drug for orthostatic hypo- response to sympathetic stimulation and toα-adrenoceptor tention. stimulation by noradrenaline in humans. To examine the effects of the drug, the following 2 Methods (Received April 10, 1998; revised manuscript received July 9, 1998; Subjects accepted July 14, 1998) Eight healthy Japanese males (21–26 years, 64–78 kg) Department of Clinical Pharmacology, Jichi Medical School, Tochigi were selected. They were normotensive and nonsmokers, and *Department of Clinical Pharmacology, Hamamatsu University without concomitant medication for at least 2 weeks before School of Medicine, Shizuoka, Japan Mailing address: Kazuhiro Harada, MD, Department of Clinical the study. The study was approved by the Ethical Pharmacology, Jichi Medical School, Minamikawachi-machi, Committee of Jichi Medical School and all subjects gave Kawachi-gun, Tochigi 329-0498, Japan their informed consent. Japanese Circulation Journal Vol.62, November 1998 Effect of Amezinium on Vasoconstrictor Response 825 Table 1 Blood Pressure and Pulse Rate in the Supine Position Table 2 Emax and ED50 in Response to Noradrenaline Infusion and 1min After Standing Up After the Oral Intake of a Placebo, After the Oral Dosing With Placebo, Amezinium or Midodrine Amezinium and Midodrine (Mean±SD, n=8) Placebo Amezinium Midodrine Placebo Amezinium Midodrine Emax (%) 100.8±9.9 99.2±11.4 102.6±12.0 SBP (mmHg) ED50 (ng/min) 40.6±33.9 21.0±21.3* 33.2±31.5 Supine 113±10 117±11 115±11 Standing 122±13 128±15 127±15 Mean±SD, n=8. Emax, maximum venoconstrictory effect; ED50, infusion rate producing a half-maximum response. *p<0.05 vs placebo. DBP (mmHg) Supine 67±6 69±9 68±8 Standing 71±8 74±12 72±10 PR (beats/min) which are the recommended starting doses in Japan for 11,12 Supine 62±8 61±7 62±7 these drugs, or a placebo. Two and half hours after Standing 79±16 74±12 77±13 amezinium, around the tmax of the drug,13 1.5h after midodrine, around the tmax of its active metabolite, dimethoxyphenyl- SBP, systolic blood pressure; DBP, diastolic blood pressure; PR, pulse rate. aminoethanol,14 or 2 h after placebo, the finger-tip skin vasoconstrictor response to cold stimulation was assessed, followed by assessment of the venoconstrictor response to Finger-Tip Blood Flow (FTBF) Measurement noradrenaline infusion. The measurements started around The subjects were comfortably seated with their right 10.30h. Between the preceding assessments (ie around 2h arm resting on a table at the heart level. Cutaneous FTBF and 50min after amezinium, 1hour and 50min after mido- was recorded from the pad of the right midfinger by a laser drine, and 2h and 20min after the placebo) blood pressure Doppler flowmeter (Peri Flux PF3, Perimed, Sweden) with and pulse rate were measured both in the supine position an integrating probe with 7 efferent fibers. Laser Doppler and 1min after standing up, using a semiautomated sphyg- flow was expressed in arbitrary units. The recording of momanometer (BP-103iII, Nihon Colin, Komaki, Japan). FTBF was started after the subjects rested for more than 10 The experiments were performed in a room with the min, and when the value of FTBF stabilized, cold stimula- ambient temperature controlled at 24–26°C. tion was performed by immersing the left hand in ice water (1–3°C) for 15sec. FTBF rapidly decreased with a latent Data Evaluation time of a few seconds and gradually returned to the level FTBF: Data were expressed in arbitrary units. Effects before the stimulation. of contralateral hand cooling on FTBF were quantitated using the following equation: Dorsal Hand Vein Method The LVDT used (Schaevits type 025MHR, Pennsauken, Reduction Ratio (RR) NJ, USA) has a freely movable core that rests over the =[(FTBFbef –FTBFmin)/FTBFbef]×100% center of the vein to be studied. There is a linear relation- ship between the vertical movement of the core and the where FTBFbef is the blood flow recorded just before the change in voltage output. During the study, the subject was cold stimulation and FTBFmin is the minimum blood flow in the supine position with an arm placed on a support recorded during the cold stimulation. sloping upward at an angle of about 30 degrees from the Dorsal Hand Vein Constriction: The individual dose- horizontal. In this position, emptying of the superficial response curve was analyzed by the following equation: hand vein occurred. A 25-gauge needle was inserted into a dorsal hand vein and a continuous infusion of physiological Effect=[Emax ×ex/(ED50 +ex)]×100% saline was started. The core was placed over the center of the vein about 10mm downstream from the tip of needle. where x is the infusion rate of noradrenaline, Emax is the The voltage output was recorded on a strip chart recorder maximum venoconstrictor effect, and ED50 is the infusion (Linearcorder Mark VII; Graphtec, Yokohama, Japan). Ten rate producing a half- maximum response. The data were minutes after the insertion of the needle, increasing doses fitted to this equation by the least-squares method, provid- (from 1 to 512ng/min) of noradrenaline (Nor-Adrenalin®, ing estimates of ED50 and Emax. Sankyo, Tokyo) were infused into the dorsal hand vein and Data are expressed as mean±SD. Statistical analysis for recordings of the position of the core were made before and the differences between the drugs and placebo were per- after inflation of a sphygmomanometer cuff on the same formed by analysis of variance (ANOVA) followed by arm to 45mmHg. Drug infusion lasted for 5min and the cuff Scheffe’s multi-range test. A probability value of p<0.05 was inflated for the last 1min during each infusion period. was considered as significant. Study Protocol Subjects were instructed to refrain from caffeine- Results containing and alcoholic beverages from 12h before the Blood Pressure and Pulse Rate start of the study. No breakfast was taken on the study Blood pressure and pulse rate in the supine position and days.
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