ایجاد یک بستر نرمافزاری برای شبیهسازی روش نوسانسنجی در اندازهگیری فشار خون با توجه به اثرات فشار خارجی بر سطح مقطع رگ
الموضوعات :
1 - دانشکده مهندسی برق- واحد نجفآباد، دانشگاه آزاد اسلامی، نجفآباد، ایران
2 - مرکز تحقیقات پردازش دیجیتال و بینایی ماشین- واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
الکلمات المفتاحية: فشار خون, سیستول, دیاستول, نوسانسنجی,
ملخص المقالة :
فشار خون بالا از عوامل خطرساز بیماری های عروق کرونر قلب است که به بدن آسیب جدی می رساند. تشخیص به موقع بیماری فشار خون می تواند فرد را از عوارض این بیماری مصون دارد. از روش های غیرتهاجمی اندازه گیری فشار خون، روش نوسان سنجی است. این روش با اندازه گیری نوسانات ایجاد شده از تقابل فشار شریان و فشار کاف پیچیده شده به دور بازو، اقدام به تخمین مقادیر فشار خون می نماید.در این پژوهش هدف ایجاد یک بستر نرم افزاری برای شبیه سازی رفتار رگ و کاف است که بتوان از آن برای بررسی عملکرد الگوریتم های مختلف اندازه گیری فشار خون به روش اسیلومتریک استفاده کرد. در این راستا، تمام اجزاء اعم از کاف، شریان بازویی، چگونگی استخراج نوسانات از منحنی فشار خون و تخمین فشارهای سیستول و دیاستول مدل سازی خواهند شد. با پیاد ه سازی مدل سازی در نرم افزار متلب می توان بدون نیاز به محیط کلینیکی، اندازه گیری فشار خون را مورد ارزیابی قرار داد. با وارد نمودن مشخصات اصلی فشار شریان به عنوان ورودی، می توان در خروجی پارامترهای فشار خون را به دست آورد.خروجی مدل سازی با نمونه های واقعی 50 مورد اندازه گیری شده مورد مقایسه و دقت تخمین فشارهای سیستول و دیاستول به ازای دو الگوریتم حداکثر نوسان و حداکثر/حداقل شیب با در نظر گرفتن مقادیر واقعی بررسی شد. نتایج حاصل از مقایسه عملکرد مدل سازی با مقادیر اندازه گیری شده حاکی از آن است که الگوریتم حداکثر نوسان، عملکرد مناسب تری نسبت به الگوریتم حداکثر/حداقل شیب دارد. مقدار متوسط خطا در الگوریتم حداکثر نوسان برای فشار حداکثر نوسان (MAP)، سیستول و دیاستول به ترتیب برابر با 64/0±9/1، 82/0±6/1 و1/5±8/6 به دست آمده است.
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