Elektronička auskultacija disanja za otkrivanje astmatičnih napadaja u djece

scientific master's theses

• Author: Igor Mazić
• Mentor: Ratko Magjarević (mentor)
• Committee member: Ratko Magjarević (predsjednik povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2004, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Auskultacija (slušanje) i mjerenje zvučnih signala tijekom disanja koristi se u dijagnostici plućnih bolesti, uglavnom u kliničkoj okolini i kontroliranim uvjetima. Za bronhijalnu astmu, jednu od učestalih kroničnih bolesti, karakteristična je prilikom izdisaja povremena i kratkotrajna pojava tonova (fićuka) u frekvencijskom području od nekoliko stotina herca. Amplituda tonova i učestalost njihove pojave ovisi o protoku zraka u dišnom sustavu, odnosno o stupnju opstrukcije kod bolesnika. Za ranu detekciju astmatičnih napadaja koriste se kod odraslih osoba jednostavna prijenosna mjerila protoka. Takva mjerila smatraju se neprimjerenim kod djece, zbog slabe mogućnosti kontrole jednolikosti disanja u različitim prilikama. Cilj ovog rada je ispitati mogućnosti rane detekcije astme u djece analizom i obradom respiracijskih signala dobivenih s pomoću mjernih pretvornika. Koristila su se dva tipa mjernih pretvornika: mikrofon i akcelerometar koji su se postavljali na dušnik i prsni koš. Spektri signala snimljenih fonopneumograma su se računali različitim metodama te su se grafički prikazivali u vremensko-frekvencijskoj ravnini. Ispitivanje se provelo u suradnji s Općom bolnicom Dubrovnik na uzorku od 28 djece koji su bili u fazi pozitivne remisije u dobi od jedne do sedam godina.

Abstract (english)

The auscultation and measurement of respiratory acoustical signals is used in pulmonary disease diagnostics, mainly under controlled conditions in clinical environment. The occasional and short breath occurrence of sounds (wheezing) in frequency range of a few hundred Hz is characteristic for expiration in cases of bronchial asthma, one of the common chronic diseases. The amplitude of the respiratory sounds and their appearance depend on the air flow in the respiratory system, meaning, they depend on patient's grade of pulmonary obstruction. Plane peak-flow meters are used for early detection of asthmatic seizures in adults. Such peak-flow meters are considered inadequate for children, due to weak control capacity of monotonous breathing in different situations. The aim of this study was to validate the possibility of early asthma detection in children by analysis and processing of respiratory signals attained from transducers. Two types of transducers were used: electret microphones and accelerometers, positioned over trachea and chest. The power spectra were calculated and analyzed using different methods, and the results were graphical presented in the time-frequency plane. The research was accomplished in cooperation with General Hospital in Dubrovnik within the sample group of 28 infants (1-7 years old) which were in state of possitive remission.

• Keywords: auskultacija; astma; fićuk; fonopneumogram; spektralna analiza; zvuk disanja
• Keywords (english): auscultation; asthma; wheezing; phonopneumograph; spectral analysis; respiratory sounds
• Language: croatian
• URN:NBN: urn:nbn:hr:168:178358
• Study programme: Title: Postgraduate master programme in electrical engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
• Type of resource: Text
• Extent: 101 str. ; 30 cm
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2020-03-09 13:23:38