• Journal of Nutrition and Health
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• 제52권2호
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• pp.129-138
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• 2019

구기자 나무의 열매와 잎, 클로로필 제거 잎의 에탄올 추출물들의 항염 효능을 확인하여 항염 기능성 소재로의 적용 가능성을 알아보고자 하였다. 효능 측정은 세포단위와 동물실험을 통하여 실시하였다. RAW264.7 세포에서는 LPS와 동시에 추출물 (LFE, LLE, LLE with CR)을 처리한 세포에서 NO와 $TNF-{\alpha}$, IL-6, $IL-1{\beta}$ 생성량 및 iNOS와 COX-2의 발현을 측정하였고, 동물실험에서는 7일간 추출물들 (LLE, LLE with CR)을 경구투여한 BALB/c mice에 LPS를 투여하여 염증을 유도한 후 혈청의 $TNF-{\alpha}$, IL-6, $IL-1{\beta}$ 농도와 DNA fragmentation을 측정하였다. RAW264.7 세포에 처리한 추출물들은 모두 $1,000{\mu}g/mL$의 농도까지 세포증식능에 영향을 주지 않아 안전한 것으로 확인되었다. LPS와 추출물을 처리한 세포로부터 생성된 NO와 $TNF-{\alpha}$, IL-6, $IL-1{\beta}$는 모두 유의하게 억제되었고 구기자 추출물에 비하여 구기엽 추출물들의 영향이 더 크게 나타났다 (p < 0.05). 또한 세포의 iNOS와 COX-2의 단백질 발현도 구기자< 구기엽< 클로로필 제거 구기엽의 순으로 억제됨을 확인할 수 있었다. BALB/c mice 동물모델에서 구기엽 추출물들의 항염 효능을 측정한 결과, 혈청 $TNF-{\alpha}$, IL-6, $IL-1{\beta}$의 농도는 구기엽 추출물 및 클로로필 제거 구기엽 추출물 투여군에서 감소하였으며 그 효과는 클로로필 제거 구기엽군에서 더 크게 나타났다. 구기엽 추출물둘은 DNA 손상보호효과를 유의하게 보였으나 두 군 간에는 차이가 없었다. 따라서 구기엽 추출물과 클로로필 제거 구기엽 추출물은 항염효능을 가진 천연 소재로 활용되어 기능성 식품 및 화장품 개발에서 활용될 수 있으므로 구기자 나무의 부가가치를 높일 수 있을 것으로 생각된다.

• Journal of Nutrition and Health
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• 제54권6호
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• pp.644-663
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• 2021

본 연구는 제6기 (2013-2015년) 국민건강영양조사 자료를 활용하여 만 15-45세의 가임기 여성 1,559명을 대상으로 요오드 섭취 및 소변 중 요오드 함량을 기준으로 요오드 섭취의 안전성을 평가하였다. 요오드 섭취량 분석을 위해 요오드 영양성분 DB를 구축한 후 24시간 식사조사자료와 매칭하여 식이를 통한 요오드 섭취량을 분석하였고, 소변 중 요오드 함량을 적용하여 하루 단위의 요오드 섭취량을 산출하였다. 또한 요오드 섭취의 안전성 평가를 위해 WHO의 평가기준을 적용하였고, 요오드의 영양소 섭취기준 중 상한섭취량을 기준으로 하여 BE를 산출한 후 소변 중 요오드 함량을 적용하여 HQ를 계산하였다. 그 결과 소변 중 요오드 함량이 100 ㎍/L 미만이어서 요오드 결핍으로 진단되는 비율은 15.22%이었고, 요오드 섭취 과잉으로 진단되는 300 ㎍/L 이상인 대상자는 48.16%이었다. 소변 중 요오드 함량은 평균 878.71 ㎍/L이었고, 요오드/크레아티닌은 589.00 ㎍/g이었으며, 요오드/크레아티닌은 30-45세 연령군이 15-18세, 19-29세 연령군에 비해 유의적으로 높았다. 식이를 통한 요오드 섭취량은 273.47 ㎍/day, 소변 중 요오드 함량을 통해 산출된 요오드 섭취량은 1,198.10 ㎍/day로, 두 조사방법에 의한 차이는 924.63 ㎍/day로 식이를 통한 요오드 섭취량보다 소변을 통해 산출된 요오드 섭취량이 더 높았다. 요오드 섭취량에 기여도가 높은 식품은 채소류, 어패류, 해조류 및 가공식품이었고, 요오드 섭취의 위험도를 평가하는 HQ는 한국인 영양소섭취기준 적용 시 0.228이었고, 소변 중 요오드 함량이 1,000 ㎍/L 이상 시 평균 1.665로 1 이상의 높은 수준이었다. 혈중 TSH는 2.14 mIU/L, free T4는 1.10 ng/L이었으며, 소변 중 요오드 수준과 HQ는 혈중 TSH 농도에 유의적인 차이를 보이지 않았으나, 혈중 free T4 농도는 연령과 소변 중 요오드 수준이 증가할수록 유의적으로 감소하였다. 본 연구결과 국내 가임기 여성의 과반수는 요오드를 과잉 섭취하였고, 특히 상위 10% 정도는 HQ 1 이상으로 건강에 위험할 정도의 극단적인 섭취량을 보였다, 또한, 식이와 소변을 통해 산출된 요오드 섭취량 사이에 차이가 상당히 큰 것으로 보아 충분한 요오드 DB가 구축되지 않은 현 상황에서 식이를 통한 요오드 영양상태를 평가하기보다는 소변으로 배출된 요오드 함량을 적용하여 요오드 영양상태를 평가하는 것이 더 적절할 것으로 사료되며, 과잉의 요오드 섭취가 갑상샘질환 뿐만이 아니라 관련 질환의 유병율에 미치는 다양한 연구가 수행될 필요가 있을 것으로 판단된다.

• 생명과학회지
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• 제32권2호
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• pp.101-107
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• 2022

본 연구는 패션 프룻(passion Fruit) 열매의 과육과 씨 추출물의 항염증, 항산화, 항노화 및 피부 미백의 기능성 효과에 관한 것이다. 패션 프룻 열매의 추출물은 피부 첩포에 의한 일차 자극 인체적용시험 결과 피부 자극 지수는 0.00으로 판정되었다. 또한 염증매개물질 LPS (Lipopolysaccharides)를 처리하여 Raw 264.7 대식세포를 활성화시켜 NO를 유발하고 패션 프룻 열매 추출물과 반응시켰을 때 LPS만 처리한 그룹의 NO 발생량 보다 현저히 낮은 NO 발생량을 보임으로써 패션 프룻 열매 추출물의 우수한 항염증 효과를 확인할 수 있었다. 그리고 DPPH (2,2-diphenyl-1-picrylhydrazyl) 시험을 통해 패션 프룻 열매 추출물이 5.11%의 ABTS 라디칼 소거능을 보이면서 항산화 효과가 있음을 확인하였다. 피부의 콜라겐 I 형의 합성은 노화와 다양한 피부 질병의 척도인데 인간의 프로콜라겐 I 알파 1 활성도 분석을 통하여 패션 프룻은 프로콜라겐의 합성을 약간 감소시킴을 확인하였다. 또한 멜라닌 억제 시험을 통하여 패션 프룻 열매 추출물의 미백 효능을 확인하였는데 대조군으로 식약처에서 고시한 미백 기능성 성분인 알부틴(arbutin)을 2% 이상 배합한 시료는 월귤나무에서 얻은 히드로 퀴논을 반응시켜 얻은 유기화합물로 일반적으로 백색 분말의 형태로 존재하며 멜라닌 생성을 촉진하는 티로시나아제를 억제하는 효능 효과가 있어 미백 개선의 기능성 성분으로 사용된다. 그러므로 이러한 자연에서 얻은 패션 프룻 열매 추출물의 미백 기능성 효능 확인은 화장품 및 식품의 기능성 원료의 개발에 기여할 수 있을 것으로 기대된다.

• 생명과학회지
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• 제32권2호
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• pp.108-118
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• 2022

뇌실하 영역은 뇌에서 신경줄기세포가 분포하는 곳으로 평생에 걸쳐 새로운 신경세포를 생성하는 곳이다. 많은 세포 안팎의 인자들이 신경줄기세포의 세포 증식과 신경세포로의 분화에 영향을 미친다. 최근 들어, L-type 칼슘 채널이 신경계의 발달을 조절하고 뇌실하 영역에 있는 신경줄기세포, 신경세포로 분화 중인 세포, 그리고 성숙한 신경세포에 분포한다고 밝혀졌다. L-type 칼슘 채널의 저해제인 nifedipine은 고혈압의 치료제로 오랜 기간 사용되어 왔다. 신경줄기세포에 nifedipine을 사용하여 L-type 칼슘 채널을 저해하는 연구는 많이 없는 상황이다. 이번 연구에서, 우리는 5일령 쥐의 뇌실하 영역에서 배양한 신경줄기세포에 nifedipine을 처리하여 신경세포로의 분화에 미치는 영향을 관찰하였다. Nifedipine은 Tuj1을 발현하는 신경세포의 수를 증가시킨 반면, Olig2를 발현하는 희소 돌기 아교 세포(oligodendrocytes)의 수에는 큰 영향을 미치지 않았다. Nifedipine은 S기를 표지하는 5-ethynyl-2'-deoxyuridine (EdU)가 들어간 세포의 수를 증가시켰고, 세포 분열시 나타나는 인산화된 히스톤 H3(PH3)를 발현하는 세포의 수를 증가시켰다. Nifedipine은 신경세포로의 분화를 촉진하는 Dlx2 유전자의 전사를 증가시켰고, 초기 신경세포에서 보이는 Mash1의 양도 증가시켰다. Nifedipine 외 또다른 L-type 칼슘 채널의 저해제인 verapamil을 처리하자, 신경세포로의 분화가 소폭 증가하였으나, 통계적 유의미성은 매우 낮았다. T-type 칼슘 채널의 저해제 유전자인 Cav3.1, Cav3.2, Cav3.3가 발현함을 관찰하여, T-type 칼슘 채널의 저해제인 pimozide를 신경줄기세포에 처리하였으나, 신경세포로의 분화에는 변화가 없었다. 이러한 결과를 통해 nifedipine이 신경줄기세포의 초기 분화를 증진함을 알 수 있으며, L-type 칼슘 채널이 신경세포로의 분화에 관여함을 알 수 있다.

• Korean Journal of Health Education and Promotion
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• 제2권1호
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• pp.31-61
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• 2000

Introduction. Despite the fact that half of premature deaths are caused by unhealthy lifestyles such as smoking tobacco, sedentary lifestyle, alcohol and drug abuse and poor nutrition, there are no theoretical models which accurately explain these health promotion related behaviors. This study tests a new model of health behavior called the Model of Health Promotion Behavior. This model draws on elements and frameworks suggested by the Health Belief Model, Social Cognitive Theory, the Theory of Planned Action and the Health Promotion Model. This model is intended as a general model of behavior but this first test of the model uses amount of exercise as the outcome behavior. Design. This study utilized a cross sectional mail-out, mail-back survey design to determine the elements within the model that best explained intentions to exercise and those that best explained amount of exercise. A follow-up questionnaire was mailed to all respondents to the first questionnaire about 10 months after the initial survey. A pretest was conducted to refine the questionnaire and a pilot study to test the protocols and assumptions used to calculate the required sample size. Sample. The sample was drawn from 2000 eligible participants at two blue collar (utility company and part of a hospital) and two white collar (bank and pharmaceutical) companies located in Southeastern Michigan. Both white collar site had employee fitness centers and all four sites offered health promotion programs. In the first survey, 982 responses were received (49.1％) after two mailings to non-respondents and one additional mailing to secure answers to missing data, with 845 usable cases for the analyzing current intentions and 918 usable cases for the explaining of amount of current exercise analysis. In the follow-up survey, questionnaires were mailed to the 982 employees who responded to the initial survey. After one follow-up mailing to non-respondents, and one mailing to secure answers to missing data, 697 (71.0％) responses were received, with 627 (63.8％) usable cases to predict intentions and 673 (68.5％) usable cases to predict amount of exercise. Measures. The questionnaire in the initial survey had 15 scales and 134 items; these scales measured each of the variables in the model. Thirteen of the scales were drawn from the literature, all had Cronbach's alpha scores above .74 and all but three had scores above .80. The questionnaire in the second mailing had only 10 items, and measured only outcome variables. Analysis. The analysis included calculation of scale scores, Cronbach's alpha, zero order correlations, and factor analysis, ordinary least square analysis, hierarchical tests of interaction terms and path analysis, and comparisons of results based on a random split of the data and splits based on gender and employer site. The power of the regression analysis was .99 at the .01 significance level for the model as a whole. Results. Self efficacy and Non-Health Benefits emerged as the most powerful predictors of Intentions to exercise, together explaining approximately 19％ of the variance in future Intentions. Intentions, and the interaction of Intentions with Barriers, with Support of Friends, and with Self Efficacy were the most consistent predictors of amount of future exercise, together explaining 38％ of the variance. With the inclusion of Prior Exercise History the model explained 52％ of the variance in amount of exercise 10 months later. There were very few differences in the variables that emerged as important predictors of intentions or exercise in the different employer sites or between males and females. Discussion. This new model is viable in predicting intentions to exercise and amount of exercise, both in absolute terms and when compared to existing models.

• 한국가정과교육학회지
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• 제26권4호
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• pp.85-114
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• 2014

본 연구는 21세기 학습 환경과 학습자가 변화되고 있는 교육 패러다임의 변화에 맞추어 중학교 기술 가정 '건강한 식생활과 식사 구성'을 중심으로 스마트교육을 기반으로 한 가정과 식생활 교수 학습 과정안과 스마트교재를 개발하고, 이를 수업에 적용하여 스마트교재를 평가하고 수업의 효과를 분석하는데 목적이 있다. 연구의 목적을 달성하기 위한 연구내용은 다음과 같다. 첫째, 스마트교육을 기반으로 한 '건강한 식생활과 식사 구성'을 중심으로 가정과 식생활 교수 학습 과정안을 개발한다. 둘째, 개발한 식생활 교수 학습 과정안을 기본으로 하여 스마트컨텐츠 저작도구를 이용하여 식생활 스마트교재를 제작한다. 셋째, 개발한 스마트교육을 기반으로 한 식생활 수업을 실행한 후에 이 수업을 평가한다. 연구 과정은 ADDIE 모형에 따라 분석, 설계, 개발, 실행, 평가의 5단계로 진행하였다. 분석 단계에서는 2009 개정 중학교 기술 가정 교육과정과 해설서, 성취기준 성취수준 분석 및 '건강한 식생활과 식사 구성' 관련 교과서를 분석하였다. 설계 단계에서는 교수 학습 과정안을 구상하고 학습 목표 및 수업 과정을 설계하였다. 이를 위해 2009 개정 기술 가정 교육과정의 '청소년의 생활' 단원의 건강한 식생활과 식사 구성을 중심으로 하여 교과서의 내용 요소를 추출하여 내용을 재구성하고, 재구성한 내용을 토대로 학습 목표 및 수업 과정을 설계하였다. 개발 단계에서는 '청소년의 생활'에 속한 '건강한 식생활과 식사 구성' 중 2개의 소단원인 '청소년의 식생활 문제'와 '균형 잡힌 건강 식생활의 실천'으로 각 2차시씩 총 4차시 분량의 교수 학습 과정안과 학습 활동지 및 학습 자료 등의 교수 학습 자료를 제작하였으며, 이를 토대로 스마트컨텐츠 저작도구인 DocZoom을 이용하여 스마트교재를 개발하였다. 그리고 스마트교육을 기반으로 한 식생활교육 프로그램 적용의 효과성 및 스마트교재 활용 수업에 대한 태도를 알아보고자 사전 사후 설문지를 제작하였다. 실행 단계에서는 교수 학습 과정안을 적용하여 개발된 식생활교육 관련 스마트교재를 수업에 적용하였다. 개발된 교수 학습 과정안을 토대로 제작한 소단원 2개 분량의 식생활교육 스마트교재를 이용하여 2014년 6월 2일부터 6월 13일까지 경기도 광명에 있는 남녀공학의 S 중학교 1학년 각각 3학급을 대상으로 실험집단과 비교집단으로 나누어 1주일에 2시간씩 기술 가정 수업에 직접 활용하였다. 총 2주간의 수업을 실행한 후, 사전 사후 설문을 실시하고, 평가 단계에서는 실험집단과 비교집단의 사전 사후 설문 점수의 평균 및 표준편차를 산출하고, 쌍표본 t-test를 실시하여 개발된 식생활교육 스마트교재의 수업 적용 효과를 알아보았다. 본 연구의 결과는 다음과 같다. 스마트교육을 기반으로 한 스마트교재를 활용한 수업에서 가정과 수업에 대한 흥미(t=-3.99, p<.001), 학습에 대한 애정과 열정(t=-2.61, p<.05), 학습에의 주도성 및 독립성(t=-4.77, p<.001), 학생들의 식생활 수업에 대한 관심도(t=-3.83, p<.001)를 높이는데 효과적이었다. 스마트교재를 활용한 수업을 받은 학생들을 대상으로 이 수업에 대한 평가를 한 결과, 학생들은 스마트교재를 활용한 수업이 기존의 서책형 교과서를 이용한 수업보다 수업 자료를 찾는데 시간을 절약할 수 있었으며, 동영상과 도표 등의 관련 자료를 바로 볼 수 있어 이해하기 쉬웠다고 평가하였다. 또한, 다수의 학생이 기존의 서책형 교과서를 이용한 수업보다 편리하였으며, 수업이 더 재미있어졌다고 응답하는 등 학생들은 스마트교재를 이용한 수업을 흥미로워 하였으며, 학습에 도움이 되는 등의 긍정적인 평가를 하였다. 이러한 결과로 볼 때 가정과에서 스마트교재를 활용한 스마트교육은 가정과 수업에 대한 흥미를 향상시켰을 뿐만 아니라 학습에 대한 애정과 열정, 학습에서의 주도성 및 독립성, 식생활 수업에 대한 관심도를 향상시키는데 효과가 있음을 알 수 있었다.

• Radiation Oncology Journal
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• 제20권1호
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• pp.41-52
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• 2002

목적 : 호흡주기에 따른 위치변동 감지센서를 이용하여 종양의 위치가 일정워치에 있을 때만 방사선을 치료하는 호흡 동기치료기구를 제작하고 일정한 호흡주기 상태에서 수행된 CT simulation과 3차원 입체조형치료계획에 따라 방사선을 치료하는 시스템을 개발하고자 하였다. 호흡유무에 따른 종양의 치료 마진(margin)을 측정하고 계획용표적체적(planning target volume:PTV)의 크기에 따른 선량체적표(dose volume histogram:DVH)와 종양억제확률(tumor control probability:NTCP), 건강조직손상확률(normal tissue complication probability:NTCP) 및 선량 통계자료를 통하여 치료성과를 평가하고 선량증강 범위를 예측하고자 하였다. 대상 및 방법 : 종양이 비교적 작고 전이가 없는(T1N0M0) 5명의 폐암환자를 선택하여 X-선 조준장치를 이용하여 횡격막의 이동거리를 측정하는 방법으로 내부장기의 운동을 평가하였다. 호흡동기치료기구는 끌어당김 센서가 부착된 허리띠 모양으로 구성되었으며 이를 흉곽 또는 복부에 부착하여 호흡주기에 의한 흉곽의 크기변동에 따라 센서의 회로가 개폐되고 이것을 선형가속기의 조종간에 연결하는 간단한 기구로서 감도와 재현성이 높았다. 호흡을 배기한 후 일시적 호흡이 정지된 상태에서 Spiral-CT (PQ-5000)로 3차원 영상을 획득하고 Virtual CT-simulator (AcQ-SIM)에 의하여 종양의 위치와 주위 장기들을 확인 도시하였으며 3차원 치료계획장치(Pinnacle, ADAC Co.)를 이용하여 3차원 입체조형치료를 계획하였다. 치료계획의 평가는 호흡동기치료기구의 사용유무에 따른 PTV의 크기에 따라 최적 선량분포를 구사하였으며 각각의 DVH, TCP, NTCP 및 선량통계자료를 도출 비교 검토하였다. 결과 : X-선 simulation에서 폐암환자의 횡격막 이동은 약 1 cm에서 2.5 cm로서 평균 1.5 cm로 측정되었고 자유호흡시 PTV는 CTV (clinical target volume)에 약 2 cm 마진을 주었으며 호흡동기치료기구를 사용하였을 때는 0.5 cm 마진이 적당한 것으로 측정되었다. 종양의 PTV는 연장 마진의 거의 자승비로 증가하였으며 TCP의 값은 마진 범위 $(0.5\~2.0\;cm)$에 관계없이 거의 일정하였고 NTCP의 값은 마진 크기에 따라 평균 $65\%$로 급속히 증가하였다. 결론 : 호흡주기에 따른 위치변동 감지센서를 이용한 호흡동기치료기구는 종양의 위치가 일정할 때만 방사선이 조사되는 간단하고 정확한 장치로서 3차원 입체조형치료 및 강도변조방사선치료에서 매우 유용한 장치임을 확인할 수 있었다. 또한 호흡조절 방사선입체조형치료방법의 기술과 시술절차를 확립시키고 정량적인 선량평가를 위하여 DVH, TCP, NTCP 등의 정량분석과 종양의 투여 선량 증가량(dose escalation)을 예측하는 기초자료를 제공할 수 있었다.

• The Korean Journal of Pain
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• 제1권1호
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• pp.34-46
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• 1988

Intractable pain from advanced carcinoma of the upper abdomen is difficult to manage. One method used to control pain associated with these malignancies is to block off the splanchnic nerve. In 1919 Kappis described a technique by which the splanchnic nerve of the upper abdomen could be anesthetized, using a percutaneous injection. This method has been used for the relief of upper abdominal pain due to hematoma and cancer of the pancreas, stomach, gall bladder, bile duct, and colon. During the Period from November 1968 to January 1986, this method was used in 208 cases of malignancy at Severance Hospital and clinically evaluated. Patients were retroactively grouped according to the stage of development of technique used. Twelve patients who received the treatment in the period from November 1968 to March 1977 were designate4i as group 1, 26 patients from April 1977 to April 1979 as group 2, and 170 from May 1979 to January 1986 as group 3. The results are as follows: 1) The number of patients receiving splanchnic nerve block has been increasing since 1977. 2) A total of 208 patients, including 133 males and 75 females, ranging in age from 18 to 84 and averaging 51. 3) The causes of pain were stomach cancer 90, pancreatic cancer 69, and miscellaneous cancer 49 cases respectively. 4) There were 57.7% who had surgery. and 3.7% of whom had chemotherapy before the splanchnic nerve block was done. 5) These blocks were carried out with the patient in the prone position as described by Dr. Moore. For group 2 and 3, C-arm image intensifier was used. In group 1, a 22 gauze loom long needle was inserted at the lower border of the 12th rib on each aide about 7\;cm from the midline. The average distance from the midline was $6.60{\pm}0.61\;cm$ on the left side and $6.60{\pm}0.83\;cm$ on the right side in group 2, and $5.46{\pm}0.76\;cm$ on the left side and $5.49{\pm}0.69\;cm$ on the right side in group 3. The average depth to which the needle was inserted was $8.60{\pm}0.52\;cm$ on the left side and $8.74{\pm}0.60\;cm$ on the right side in group 2, and $8.96{\pm}0.63\;cm$ on the left side and $9.18{\pm}0.57\;cm$ on the right side in group 3. 6) The points of the inserted needles were positioned in the upper quarter anteriorly, 51.8% on the left side and 54.4% n the right side of the L1 vertebra by lateral roentgenogram in group 3. The inserted needle points were located in the upper and anterolateral part, of the L1 vertebra 68.5% on the left side and 60.6won the right side, on the anteroposterior rentgenogram in group 3. The needle tip was not advanced beyond the anterior margin of the vertebral body. 7) In some case of group 3, contrast media was injected before the block was done. It shows, the spread upward along the anterior mal gin of the vertebral body. 8) The concentration and the average amount of drug used in each group was as follows: In group 1, $39.17{\pm}6.69\;ml$ of 0.5% -l% lidocaine or 0.25% bupivacaine were injected for the test block and one to three days after the test block $40.00{\pm}4.26\;ml$ of 50% alcohol was injected for the semipermanent block. In group 2, $13.75{\pm}4.88\;ml$ of 1% lidocaine were used as the test block and followed by $46.17{\pm}4.37\;ml$ of 50% alcohol was injected as the semipermanent block. In group 3, $15.63{\pm}1.19\;ml$ of 1% lidocaine for test block followed by $15.62{\pm}1.20\;ml$ of pure alcohol and $16.05{\pm}2.58\;ml$ of 50% alcohol for semipermanent block were injected. 9) The result of the test block was satisfactory in all cases. However the semipermanent block was 83.3 percent of the patients in group 1 who received relief from pain for at least 2 weeks after the block, 73.1% in group 2, and 91.8% in group 3. In these unsuccessful cases, 2 cases in group 1 were controlled by narcotics but 7 cases in group 2 and 14 cases in group 3 received the same splanchnic nerve block 1 or 2 times again within 2 weeks. But, in some cases it was 3 to i months before the 2nd block and in 1 cases even 7 years. 10) The most common complications of splanchnic nerve block were hypotensino(25.5%) occasional flushing of the face, nausea, vomiting, and chest discomfort. 11) For the patients in group 3, the supplemental block most commonly used was a continuous epidural block; it was used as a diagnostic block and to afford relief from pain before the splanchnic nerve block was done. 12) The interval between the receiving of the alcohol block and discharge was from 5 to 8 days in 61 cases(31.1%) and from 1 to 2 days in 48 cases(24.5%). From the above results, it can be concluded that the splanchnic nerve block done in the prone position with pure and 50% alcohol immediately after an effective test block with 1% lidocaine under C-arm fluoroscopic control is satisfactory and reliable. How to minimize the repeat block is still a problem to be solved.

• Journal of Preventive Medicine and Public Health
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• 제30권2호
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• pp.437-461
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• 1997

이 연구는 의료보험관리공단의 공 교 의료보험자료를 이용하여 1989년부터 1993년까지의 5년간의 60세이상의 노인의 의료이용과 진료비의 변화를 연령별, 성별, 의료 보험료 수준별 코호트를 구성하여 상병당으로 분석함으로써 좀 더 정확한 변화의 양상을 파악하고 예측을 하는데 연구의 목적이 있다. 연령별 연도별 입원 수진율은 연도별 입원수진율은 70-74세 군이 89년과 93년에 각각 1,000명당 117.3과 141.1로 가장 높았으며, 매년 증가하는 추세이다. 연령 코호트의 연도별 상병건수는 전체적으로는 5년 동안에 40.5%증가하였다. 성별 코호트의 연도별 상병건수는 남자 상병건수보다 여자가 많이 증가하였으며, 남자와 여자의 연평균 증가율은 각각 9.1%와 10.2%였다. 연령 코호트의 상병당 연도별 입원진료비의 변화는 전체적으로 보았을 때 5년간 총 진료비는 15.4%증가 하였다. 이 중 진료행위료의 증가가 21.5%로 가장 큰 폭으로 증가하였다. 의료 보험료 수준별 코호트의 상병당 입원진료비 변화는 보험료 수준이 낮은 군보다 높은 군에서 진료비가 높았으며, 보험료 수준별 코호트의 연도의 경과에 따라서 각종 진료비가 증가하였다. 재원기간은 0.08% 증가하여 거의 변화가 없었으며, 1991년을 기점으로 감소하는 경향이었다. 10대 다빈도 상병 중에서 가장 흔한 질병은 백내장이었다. 1993년의 10대 다빈도상병 중 1989년에 비하여 비율이 증가한 상병은 백내장, 뇌동맥 폐색이었으며, 감소한 질병은 폐결핵과 본태성 고혈압이었다. 전체 상병에서 10대 상병이 차지하는 비율은 30-35%였으며, 연령군별로는 차이가 없었다. 연령 코호트의 이용의료기관별 평균진료비 및 재원 기간은 전체적으로는 병원급 의료기관에서의 진료비 증가율이 가장 높았으며, 재원기간은 의료기관 종별에 관계없이 감소하였으며, 병원이 4.9% 감소하여 감소폭이 가장 켰다. 총 상병건수에서 고액진료건수가 차지하는 비율은 67.6% 증가하였고, 암환자건수는 8.9% 증가하였으며, 장기입원환자가 차지하는 비율은 오히려 1.2% 감소하였다. 총 진료비 규모는 62.2% 증가하였으며, 고액상병진료비가 차지하는 비율은 5년간 129.9% 증가하였고, 암환자 진료비는 68.5%, 장기입원환자의 진료비는 59.4% 증가하였다. 상병당 입원진료비 및 재원기간을 1989년 수가로 환산하여 변화 추이를 보면, 상병당 총 진료비는 매우 완만한 증가를 보이고, 약제비는 오히려 약간 감소하는 경향이었고, 진료행위료는 지속적으로 상승하는 추세였다. 재원기간은 완만하게 감소하는 양상을 보였다. 연령구간별로 구분하여 분석한 결과 진료비와 재원기간과는 연령에 관계없이 비슷한 상관계수를 보였으나, 의료보험료 수준과 연령구간별 진료비는 상관계수는 매우 작았으며, 연령군별로 큰 차이는 없었다. 시계열 분석 결과 향후 약제비는 매우 완만한 감소 추세를 보일 것이고, 진료행위료와 총 진료비는 지속적으로 증가할 것으로 예측되었으며, 재원기간은 13.0일로 변화가 없을 것으로 예측되었다. 이 연구에서는 진료행위료의 증가가 총 진료비의 상승을 주도하고 있는 것으로 생각된다. 이는 첨단 의료기기나 신기술의 도입에 의한 것으로 의료기관들의 서비스 다각화 전략과도 관련 있는 것으로 생각된다. 또한 의료이용량 즉 입원상병건수의 증가가 진료비 상승에 영향을 많이 미치는 것으로 판단되며 전체 인구 집단의 의료비 상승요인과는 다른 양상을 보일 수 있으므로 노인 인구에 대한 의료비 절감 대책은 다른 연령층과 구별하여 적용할 필요성이 있다고 볼 수 있다. 향후 노인 연령 군별 질병양상의 변화와 서비스량 및 변화에 대한 연구를 개인특성 자료나 의료기관의 특성 등과 연계하여 포괄적인 연구를 수행함으로써 노인입원 특성과 향후 노인의료 이용량과 진료비의 추이를 판단하고 이를 토대로 노인의료문제의 해결을 위한 방안을 마련할 수 있으리라 생각된다.

• 대한의용생체공학회:의공학회지
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• 제6권2호
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• pp.1-8
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• 1985

The wall shear stress in the vicinity of end-to end anastomoses under steady flow conditions was measured using a flush-mounted hot-film anemometer(FMHFA) probe. The experimental measurements were in good agreement with numerical results except in flow with low Reynolds numbers. The wall shear stress increased proximal to the anastomosis in flow from the Penrose tubing (simulating an artery) to the PTFE: graft. In flow from the PTFE graft to the Penrose tubing, low wall shear stress was observed distal to the anastomosis. Abnormal distributions of wall shear stress in the vicinity of the anastomosis, resulting from the compliance mismatch between the graft and the host artery, might be an important factor of ANFH formation and the graft failure. The present study suggests a correlation between regions of the low wall shear stress and the development of anastomotic neointimal fibrous hyperplasia(ANPH) in end-to-end anastomoses. 30523 T00401030523 ^x Air pressure decay(APD) rate and ultrafiltration rate(UFR) tests were performed on new and saline rinsed dialyzers as well as those roused in patients several times. C-DAK 4000 (Cordis Dow) and CF IS-11 (Baxter Travenol) reused dialyzers obtained from the dialysis clinic were used in the present study. The new dialyzers exhibited a relatively flat APD, whereas saline rinsed and reused dialyzers showed considerable amount of decay. C-DAH dialyzers had a larger APD(11.70$\pm$1.32mmHg/min)compared to CF dialyzers(4.32$\pm$0.55mmHg/min)(p<0.05). However, there was no observable difference in the UFR between the two dialyzers. Neither APD nor UFR showed any significant increase with an increasing number of reuses for up to more than 20reuses. A substantial number of failures observed in APD(larger than 20mmHe/min)on the reused dialyzers(2 out of 40 CP and S out 26 C-DAK) were attributed to the Possible damage on the fibers. The CF 15-11 HFDs which failed APD test did not show changes in the UFR compared to normal dialyzers indicating that APD is a more sensitive test than UFR test to evaluate the integrity of the fibers. 30527 T00401030527 ^x For quantitative measurement of reflected light from a clinical diagnostic strip, a prototype old reflectance photometer was designed. The strip loader and cassette were made to obtain more accurate reflectance parameters. The strip was illuminated at 45˚c through optical fiber and the intensity of reflected light was determined at rectanguLat angle using a photodiode. The kubelka-munk coefficient and reflection optical density were determined ar four different wavelengths(500, 550, 570 and 610nm) for blood glucose strip. For higher concentration than 300mg/41 about glucose, a saturation state of abforbance was observed at 500, 550 and 570nm. The correlation between glucose concentration and parameters was the best at 610nm. 30535 T00401030535 ^x Radiation-induced fibrosarcoma tumors were grown on the flanks of C3H mice. The mice were divided into two groups. One group was injected with Photofrin II, intravenously (2.5mg/kg body weight). The other group received no Photofrin II. Mice from both groups were irradialed for approximately 15 minutes at 100, 300, or 500 mW/cm2 with the argon (488nm/514.5 nm), dye(628nm) and gold vapor (pulsed 628 nm) laser light. A photosensitizer behaved as an added absorber. Under our experimental conditions, the presence of Photolfrin II increased surface temperature by at least 40% and the temperature rise due to 300 mW/cm2 irradiation exceeded values for hyperthermia. Light and temperature distributions with depth were estimated by a computer model. The model demonstrated the influence of wavelength on the thermal process and proved to be a valuable tool to investigate internal temperature rise. 30536 T00401030536 ^x We investigated the structural geometry of thirty-eight Korean femurs. The purpose of this study is to identify major geometrical differences between Korean femurs 3nd others that we believe belong to Caucasians so that we would be able to get insights into the femoral component design that fits Asians including Koreans. We utilized computerized tomography (CT) images of femurs extracted from cadavers. The CT images were transformed into bitmap data by using a film scanner, and then analyzed by using a commercially available software called Image v.1.0 and a Macintosh IIci computer.The resulting data were compared with already published data. The major results show that the geometry of the Korean femurs is significantly different from that of Caucasians: (1) the anteversion angle and the canal flare index are greater by the amount of approximately 8˚ and 0.5, respectively, (2) the shape of the isthmus cross section is more round, and (3) the distance between the teaser trochanter and the proximal border of the isthmus is shelter by about 15 mm. The results suggested that the femoral component suitable for Asians should be different from the currently-used components designed and manufactured mostly by European or American companies. 30537 T00401030537 ^x It is well known that nonlinear propagation characteristics of the wave in the tissue may give very useful information for the medical diagnoisis. In this paper, a new method to detect nonlinear propagation characteristics of the internal vibration in the tissue for the low frequency mechanical vibration by using bispectral analysis is proposed. In the method, low frequency vibration of f0( = 100Hz) is applied on the surface of the object, and the waveform of the internal vibration x (t) is measured from Doppler frequency modulation of silmultaneously transmitted probing ultrasonic waves. Then, the bispectra of the signal x (t) at the frequencies (f0, f0) and (f0, 2f0) are calculated to estimate the nonlinear propagation characteristics as their magnitude ratio, w here since bispectrum is free from the gaussian additive noise we can get the value with high S/N. Basic experimental system is constructed by using 3.0 MHz probing ultrasonic waves and the several experiments are carried out for some phantoms. Results show the superiority of the proposed method to the conventional method using power spectrum and also its usefulness for the tissue characterization. 30541 T00401030541 ^x This paper describes the implementation of a computerized radial pulse diagnosis by aids of a clinical expert. On this base, we composed of the radial pulse diagnosis system in korean traditional medicine. The system composed of a radial pulse wave detection system and a radial pulse diagnosis system. With a detection system, we detected Inyoung and Cheongu radial pulse wave and processed it. Then, we have got the characteristic parameters of radial pulse wave and also quantified that according to the method of Inyoung-Cheongu Comparison Radial Pulse Diagnosis. We defined the jugement standard of radial pulse diagnosis system and then we confirmed the possibility for realization of automatic radial pulse diagnosis in korean traditional medicine. 30545 T00401030545 ^x Microspheres are expected to be applied to biomedical areas such as solid-phase immunoassays, drug delivery systems, immunomagnetic cell separation. To synthesize microspheres for biomedical application, "two stage shot growth method" was developed. The uniformity ratio of synthesized microspheres was always smaller than 1.05. And the surface charge density (or the number of ionizable functional groups) of the microspheres synthesized by "two stage shot growth method" was 6~13 times higher than that of the microspheres synthesized by conventional seeded batch copolymerization. As a previous step for biomedical application, adsorption experiments of bovine albumin on microspheres were carried out under various conditions. The maximum adsorbed amount was obtained in the neighborhood of pH 4.5. Isoelectric point of bovine albumin is pH 5.0, so experimental result shows that it shifted to acid area. The adsorption isotherm was obtained, the plateau region was always reached at 2.Og/L (bulk concentration of bovine albumin).The effect of the kind and the amount of surface functional group was also examined. 30575 T00401030575 ^x A medical image workstation was developed using multimedia technique. The system based on PC-486DX was designed to acquire medical images produced by medical imaging instruments and related audio information, that is, doctors' reporting results. Input information was processed and analyzed, then the results were presented in the form of graph and animation. All the informations of the system were hierarchically related with the image as the apex. Processing and analysis algorithms were implemented so that the diagnostic accuracy could be improved. The diagnosed information can be transferred for patient diagnosis through LAN(local area network). 30592 T00401030592 ^x In the conventional infrared imaging system, complex infrared lens systems are usually used for directing collimated narrow infrared beams into the high speed 2-dimensional optic scanner. In this paper, a simple reflective infrared optic system with a 2-dimensional optic scanner is proposed for the realization of medical infrared thermography system. It has been experimentally proven that the intfrared thermography system composed of the proposed optic system has the temperature resolution of 0.1˚c under the spatial resolution of lmrad, the image matrix size of 256 X 240, and tile imaging time of 4 seconds. 30593 T00401030593 ^x In this paper, MIIS (Medical Image Information System) has been designed and implemented using INGRES RDBMS, which is based on a client/server architecture. The implemented system allows users to register and retrieve patient information, medical images and diagnostic reports. It also provides the function to display these information on workstation windows simultaneously by using the designed menu-driven graphic user interface. The medical image compression/decompression techniques are implemented and integrated into the medical image database system for the efficient data storage and the fast access through the network. 30594 T00401030594 ^x In this paper, computerized BEAM was implemented for the space domain analysis of EEG. Trans-formation from temporal summation to two-dimensional mappings is formed by 4 nearest point inter-polaton method. Methods of representation of BEAM are two. One is dot density method which classify brain electrical potential 9 levels by dot density of gray levels and the other is colour method which classify brain electrical 12 levels by red-green colours. In this BEAM, instantaneous change and average energy distribution over any arbitrary time interval of brain electrical activity could be observed and analyzed easily. In the frequency domain, the distribution of energy spectrum of a special band can easily be distinguished normality and abnormality. 30608 T00401030608 ^x Laboratory information system (LIS) is a key tool to manage laboratory data in clinical pathology. Our department has developed an information system for routine hematology using down-sized computer system. We have used an IBM 486 compatible PC with 16MB main memory, 210 MB hard disk drive, 9 RS-232C port and 24 pin dot printer. The operating system and database management system were SCO UNIX and SCO foxbase, respectively. For program development, we used Xbase language provided by SCO foxbase. The C language was used for interface purpose. To make the system use friendly, pull-down menu was used. The system connected to our hospital information system via application program interface (API), so the information related to patient and request details is automatically transmitted to our computer. Our system interfaced with fwd complete blood count analyzers(Sysmex NE-8000 and Coulter STKS) for unidirectional data tansmission from analyzer to computer. The authors suggests that this system based on down-sized computer could provide a progressive approach to total LIS based on local area network, and the implemented system could serve as a model for other hospital's LIS for routine hematology. 30609 T00401030609 ^x To develop an artificial bone substitute that is gradually degraded and replaced by the regenerated natural bone, the authors designed a composite that is consisted of calcium phosphate and collagen. To use as the structural matrix of the composite, collagen was purified from human umbilical cord. The obtained collagen was treated by pepsin to remove telopeptides, and finally, the immune-free atelocollagen was produced: The cross linked atelocollagen was highly resistant to the collagenase induced collagenolysis. The cross linked collagen demonstrated an improved tensile strength. 30618 T00401030618 ^x This paper is a study on the design of adptive filter for QRS complex detection. We propose a simple adaptive algorithm to increase capability of noise cancelation in QRS complex detection with two stage adaptive filter. At the first stage, background noise is removed and at the next stage, only spectrum of QRS complex components is passed. Two adaptive filters can afford to keep track of the changes of both noise and QRS complex. Each adaptive filter consists of prediction error filter and FIR filter The impulse response of FIR filter uses coefficients of prediction error filter. The detection rates for 105 and 108 of MIT/BIH data base were 99.3% and 97.4% respectively. 30619 T00401030619 ^x To develop an artificial bone substitute that is gradually degraded and replaced by the regenerated natural bone, the authors designed and produced a composite that is consisted of calcium phosphate and collagen. Human umbilical cord origin pepsin treated type I atelocollagen was used as the structural matrix, by which sintered or non-sintered carbonate apatite was encapsulated to form an inorganic-organic composite. With cross linking atelocollagen by UV ray irradiation, the resistance to both compressive and tensile strength was increased. Collagen degradation by the collagenase induced collagenolysis was also decreased. 30620 T00401030620 ^x We have developed a monoleaflet polymer valve as an inexpensive and viable alternative, especially for short-term use in the ventricular assist device or total artificial heart. The frame and leaflet of the polymer valve were made from polyurethane, To evaluate the hemodynamic performance of the polymer valve a comparative study of flow dynamics past a polymer valve and a St. Jude Medical prosthetic valve under physiological pulsatile flow conditions in vitro was made. Comparisons between the valves were made on the transvalvular pressure drop, regurgitation volume and maximum valve opening area. The polymer valve showed smaller regurgitation volume and transvalvular pressure drop compared to the mechanical valve at higher heart rate. The results showed that the functional characteristics of the polymer valve compared favorably with those of the mechanical valve at higher heart rate. 30621 T00401030621 ^x Explosive evaporative removal process of biological tissue by absorption of a CW laser has been simulated by using gelatin and a multimode Nd:YAG laser. Because the point of maximun temperature of laser-irradiated gelatin exists below the surface due to surface cooling, evaporation at the boiling temperature is made explosively from below the surface. The important parameters of this process are the conduction loss to laser power absorption (defined as the conduction-to-laser power parameter, Nk), the convection heat transfer at the surface to conduction loss (defined as Bi), dimensionless extinction coefficient (defined as Br.), and dimensionless irradiation time (defined as Fo). Dependence of Fo on Nk and Bi has been observed by experiment, and the results have been compared with the numerical results obtained by solving a 2-dimensional conduction equation. Fo and explosion depth (from the surface to the point of maximun temperature) are increased when Nk and Bi are increased.To find out the minimum laser power for explosive evaporative removal process, steady state analysis has been also made. The limit of Nk to induce evaporative removal, which is proportional to the inverse of the laser power, has been obtained. 30622 T00401030622 ^x N1 and N2 gross neural action potentials were measured from the round window of the guinea pig cochlea at the onset of the acoustic stimuli. N1-N2 audiograms were made by means of regulating stimulant intensities in order to produce constant N1-N2 potentials as criteria for different input tone pip frequencies. The lowest threshold was measured with an input tone pip I5 dB SPL in intensity and 12 KHz in frequency when the animal was in normal physiological condition. The procedure of experimental measurements is explained in detail. This experimental approach is very useful for the investigation of the Cochlear function. Both noN1inear and active functions of the Cochlea can be monitored by N1-N2 audiograms. 30623 T00401030623 ^x In electrical impedance tomography(EIT), we use boundary current and voltage measurements toprovide the information about the cross-sectional distribution of electrical impedance or resistivity. One of the major problems in EIT has been the inaccessibility of internal voltage or current data in finding the internal impedance values. We propose a new image reconstruction method using internal current density data measured by NMR. We obtained a two-dimensional current density distribution within a phantom by processing the real and imaginary MR images from a 4.77 NMR machine. We implemented a resistivity mage reconstruction algorithm using the finite element method and sensitivity matrix. We presented computer simulation results of the mage reconstruction algorithm and furture direction of the research. 30624 T00401030624 ^x A new method of digital image analysis technique for discrimination of cancer cell was presented in this paper. The object image was the Thyroid eland cells image that was diagnosed as normal and abnormal (two types of abnormal: follicular neoplastic cell, and papillary neoplastic cell), respectively. By using the proposed region segmentation algorithm, the cells were segmented into nucleus. The 16 feature parameters were used to calculate the features of each nucleus. A9 a consequence of using dominant feature parameters method proposed in this paper, discrimination rate of 91.11% was obtained for Thyroid Gland cells. 30625 T00401030625 ^x An electrical stimulator was designed to induce locomotion for paraplegic patients caused by central nervous system injury. Optimal stimulus parameters, which can minimize muscle fatigue and can achieve effective muscle contraction were determined in slow and fast muscles in Sprague-Dawley rats. Stimulus patterns of our stimulator were designed to simulate electromyographic activity monitored during locomotion of normal subjects. Muscle types of the lower extremity were classified according to their mechanical property of contraction, which are slow muscle (msoleus m.) and fast muscle (medial gastrocneminus m., rectus femoris m., vastus lateralis m.). Optimal parameters of electrical stimulation for slow muscles were 20 Hz, 0.2 ms square pulse. For fast muscle, 40 Hz, 0.3 ms square pulse was optimal to produce repeated contraction. Higher stimulus intensity was required when synergistic muscles were stimulated simultaneously than when they were stimulated individually. Electrical stimulation for each muscle was designed to generate bipedal locomotion, so that individual muscles alternate contraction and relaxation to simulate stance and swing phases. Portable electrical stimulator with 16 channels built in microprocessor was constructed and applied to paraplegic patients due to lumbar cord injury. The electrical stimulator restored partially gait function in paraplegic patients. 30626 T00401030626 ^x Two-Dimensional modelling of the Cochlear biomechanics is presented in this paper. The Laplace partial differential equation which represents the fluid mechanics of the Cochlea has been transformed into two-dimensional electrical transmission line. The procedure of this transformation is explained in detail. The comparison between one and two dimensional models is also presented. This electrical modelling of the basilar membrane (BM) is clearly useful for the next approach to the further. Development of active elements which are essential in the producing of the sharp tuning of the BM. This paper shows that two-dimension model is qualitatively better than one-dimensional model both in amplitude and phase responses of the BM displacement. The present model is only for frequency response. However because the model is electrical, the two-dimensional transmission line model can be extended to time response without any difficult. 30627 T00401030627 ^x A method has been proposed for the fully automatic detection of left ventricular endocardial boundary in 2D short axis echocardiogram using geometric model. The procedure has the following three distinct stages. First, the initial center is estimated by the initial center estimation algorithm which is applied to decimated image. Second, the center estimation algorithm is applied to original image and then best-fit elliptic model estimation is processed. Third, best-fit boundary is detected by the cost function which is based on the best-fit elliptic model. The proposed method shows effective result without manual intervention by a human operator. 30628 T00401030628 ^x The intelligent trajectory control method that controls moving direction and average velocity for a prosthetic arm is proposed by pattern recognition and force estimations using EMG signals. Also, we propose the real time trajectory planning method which generates continuous accelleration paths using 3 stage linear filters to minimize the impact to human body induced by arm motions and to reduce the muscle fatigue. We use combination of MLP and fuzzy filter for pattern recognition to estimate the direction of a muscle and Hogan's method for the force estimation. EMG signals are acquired by using a amputation simulator and 2 dimensional joystick motion. The simulation results of proposed prosthetic arm control system using the EMf signals show that the arm is effectively followed the desired trajectory depended on estimated force and direction of muscle movements. 30638 T00401030638 ^x A new neural network architecture for the recognition of patterns from images is proposed, which is partially based on the results of physiological studies. The proposed network is composed of multi-layers and the nerve cells in each layer are connected by spatial filters which approximate receptive fields in optic nerve fields. In the proposed method, patterns recognition for complicated images is carried out using global features as well as local features such as lines and end-points. A new generating method of matched filers representing global features is proposed in this network. 30659 T00401030659 ^x An implementation scheme of the magnetic nerve stimulator using a switching mode power supply is proposed. By using a switching mode power supply rather than a conventional linear power supply for charging high voltage capacitors, the weight and size of the magnetic nerve stimulator can be considerably reduced. Maximum output voltage of the developed magnetic nerve stimulator using the switching mode power supply is 3, 000 volts and switching time is about 100 msec. Experimental results or human nerve stimulations using the developed stimulator are presented. 30768 T00401030768 ^x In this paper, we describe the design methodology and specifications of the developed module-based bedside monitors for patient monitoring. The bedside monitor consists of a main unit and module cases with various parameter modules. The main unit includes a 12.1" TFT color LCD, a main CPU board, and peripherals such as a module controller, Ethernet LAN card, video card, rotate/push button controller, etc. The main unit can connect at maximum three module cases each of which can accommodate up to 7 parameter modules. They include the modules for electrocardiograph, respiration, invasive blood pressure, noninvasive blood pressure, temperature, and SpO2 with Plethysmograph.SpO2 with Plethysmograph.