• 동의생리병리학회지
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• 제27권3호
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• pp.313-317
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• 2013

In order to standardize the pressure/depth against radial artery, the externally-applied-pressure measuring system was fabricated and evaluated. Based on the resistance-variable characteristic of the very thin($10{\mu}m$) film conductive tape along the pressure of a tip of a examiner's hand, this system was designed. The change of the pressure was processed through voltage regulator and Matlab S/W, then showed on computer monitor. The signal output through voltage regulator, and Matlab S/W was evaluated on various conditions. The evaluation was executed on these cases; an examiner slowly increases and decreases the pressure, rapidly increases and decreases the pressure, sequentially increases and decreases the pressure, sustains the pressure, micro-changes the pressure. As a pulse examiner varies the pressure on the radial artery of the examinee, the system's real-time output consistently varies according to the pressure. From the results, it is concluded that this system consistently shows the pressure of the tip of a examiner's hand in real time without interrupting the evaluation of the radial artery pulse. Therefore this system is expected to standardize the value of the pressure/depth externally applied by an examiner.

• 한국자기학회지
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• 제22권4호
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• pp.130-135
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• 2012

요골동맥의 중심인 "관" 위치에 영구자석을 붙인 후 바로 위쪽에 자성측정용 반도체 홀소자를 장착하여 전압 신호를 검출하는 하드웨어 시스템이 적용된 집게형 맥진기 시제품을 개발하였다. 집게형 맥진기와 용적맥파계를 동시 분석하는 시스템으로 20대 나이 임상참가자 40명 각각에 대한 맥진파형과 용적맥파형 두 피크값을 비교 측정한 결과 혈류속도가 평균 0.8 m/s로 기존 값과 거의 비슷하였다. 이로써 요골동맥파형-용적맥파형을 환자감시장치에서 제시하는 주요 임상의 주요값으로 적용할 수 있음을 제시하였다.

• 한국컴퓨터정보학회논문지
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• 제17권3호
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• pp.105-111
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• 2012

광용적맥파는 심박과 동맥 혈액의 산소포화도 등을 측정하기 위하여 널리 사용된다. 본 논문에서는 요골동맥에서 780nm와 940nm 적외선 LED를 사용하여 PPG 신호를 측정할 수 있는 모니터링 시스템을 구현하였다. 구현된 시스템은 여러 상황에서 특성이 서로 다른 8종의 LED와 2종의 광전 센서를 조합하여 요골동맥에서 광전용적맥파를 측정하였다. 요골동맥에서 측정된 파형들은 반전되어서 기록된다. 이렇게 반전된 파형은 수축기의 신호는 감소시키고, 확장기의 신호는 증가시킨다. 시스템을 통하여 투과형 방식과 반사형 방식에서 각각의 신호 검출이 적합한 환경과 최적의 센서 조합을 파악하여 모니터링 시스템을 구현하고, 각 조합별 그 결과 피검자의 요골동맥에서 안정적으로 사용할 수 있는 심박신호 측정 시스템을 개발하였다.

• Archives of Plastic Surgery
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• 제48권6호
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• pp.646-650
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• 2021

Head and neck reconstruction poses unique challenges in rehabilitating surgical defects in terms of integrity, function, and form. The radial forearm free flap (RFFF) has been widely used for defect coverage, especially in the head and neck area, but its versatility allows it to be used for soft-tissue reconstruction in various parts of the body. The vascular features of the flap are quite constant and reliable. Nevertheless, abnormalities of the forearm vascular tree have been described over the decades. We report a case of intraoral reconstruction after verrucous carcinoma recurrence in a 74-year-old woman with an unusual forearm flap, which we called the median forearm free flap, based on a median branch of the radial artery that was preoperatively detected using handheld Doppler ultrasonography. The distally located skin paddle was predominantly supplied by the aberrant median vessel with its perforators. The flap was thus safely harvested with this atypical pedicle. Successful reconstruction of the intraoral defect was achieved, with an uneventful postoperative course.

• Journal of Korean Neurosurgical Society
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• 제53권4호
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• pp.213-217
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• 2013

Objective : Transradial angiography has become popular among many cardiologists as a diagnostic and therapeutic tool. However, transradial cerebral angiography is not utilized to the same extent. The purpose of this study is to present our experience regarding the usefulness of transradial cerebral angiography, especially in elderly patients. Methods : Between May 2011 and February 2012, a total of 126 cerebral angiographies were performed via a transradial approach in a single center. Of them, only 47 patients were over 60 years old. In our institution, we shifted the initial access from the right femoral artery to the right radial artery in all patients requiring cerebral angiography in 2011. We did not attempt radial access in 40 cases for variable reasons. Results : The procedural success rate was 92.2%. We have four failures of transradial angiography; two because of loop formations of the radial and brachial artery and two due to multiple puncture failures. All supra-aortic vessels were successfully catheterized. However, the selective catheterization rates of the left side distal vessels were lower, as success rates were 89.7% for the right internal carotid artery and 75% for the left internal carotid artery. Procedure-related vascular complications, such as puncture site hematoma, hand ischemia, pseudoaneurysm, arteriovenous fistula and arterial dissection were not observed in our series. However, intraprocedural thrombosis developed in one patient, which was resolved completely by intraarterial thrombolytic agents. Conclusion : With advancing patient's age, we believe that transradial cerebral angiography is a useful tool to decrease patient's discomfort and more effectively manage the vessel tortuosity.

• 대한의용생체공학회:의공학회지
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• 제15권2호
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• pp.143-150
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• 1994

Wall shear rate or stress is believed to be a major hemodynamic variable influencing atherosclerosis and artery-graft anastomic intimal hyperplasia. The purpose of this study is to verify the effects of radial wall motion, artery-graft compliance and diameter mismatch, and impedance phase angle on the wall shear rate distribution near an end-to-end artery-graft anastomosis model. The results show that radial wall motion of the elastic artery model lowers the mean wall shear rates under pulsatile flow condition by 15 to 20 % comparing to those under steady flow condition at the same mean flow rate. Impedance phase angle seems to have small effects on the mean and amplitude of the wall shear rate distribution. In order to study the effects of compliance and diameter mismatch on the wall shear rates, two models are studied-Model I has 6% and Model I has 6% and Model II has 11% smaller graft diameter. Divergent geometry caused by diameter mismatch near the distal sites reduces the mean wall shear rates significantly, and this low shear region is believed to be prone to intimal hyperplasia.

• 혜화의학회지
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• 제15권2호
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• pp.263-272
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• 2006

Purpose Brain vessles have autoregulation function, so even when perfusion pressure drops, cerebral blood flow remain stable by vasodilation. Latest research on this reserve of cerebral vessels is being done using TCD, which measures the reserve of the vessels. We did a research comparing cerebral vessel and peripheral vessel reserve between Taeumin, who are more likely to suffer CVA, and the normal. We observed blood flow of Internal carotid artery siphon and radial indicis artery of the two group with TCD. Method We picked 20 people out of patients diagnosed as cerebral infarction at Cheon-An Oriental hospital of Daejeon University. They were diagnosed as Taeumin with QSCCII questionnaire and constitutional differentiation. Using TCD, we measured highest blood flow rate, mean blood flow and asymmetric counting blood flow of Internal carotid artery siphon and radial indicis artery at rest. And then we measured again after stimulating cerebral vessels, by triggering hypercapnia by self apnea and peripheral vessels by palm heating. Result At rest, mean blood flow rate of Internal carotid artery siphon showed significant decrease compared to control group. Blood flow rate of Internal carotid artery siphon after hypercapnia showed significant decline in highest blood flow rate and mean blood flow compared to control group. Cerebral vessel reaction after the hypercapnia induction showed great change in experiment group than the control group. Peripheral vessel reaction after palm heating showed significant decline in experiment group compared to control group. Conclusion In conclusion, measuring the alteration of blood flow used in diagnosing cerebral infarction, is more sensitive when vessel stimulation is done. Non-invasive TCD is effective especially in case of Taeumin who are more likely to suffer vascular disorder than others.

• Journal of Chest Surgery
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• 제39권2호
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• pp.91-98
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• 2006

배경: 관상동맥우회술에서 동맥이식편의 장기개통률이 우수하다는 사실이 알려지면서 요골동맥의 사용이 늘어나는 가운데 근위부 문합방법에 따른 차이에 대해 논의가 분분하다. 이에 본 교실에서는 요골동맥 문합방법에 따른 임상적, 영상적 차이를 비교하였다. 대상 및 방법: 강동성심병원 흉부외과에서 2003년 1월부터 2004년 12월까지 요골동맥을 사용하여 관상동맥우회술을 시행받은 환자 48명을 대상으로 요골동맥을 독립적으로 대동맥에 근위부 문합을 시행하여 관상동맥우회술을 시행받은 환자들(독립절편군, 1군)과 좌속 가슴동맥에 요골동맥을 문합하여 관상동맥우회술을 시행받은 환자들(복합절편군, II군)과의 임상결과 및 관상동맥조영술 결과를 비교하였다. 결과: 48예 중 I군은 33예(남 26예, 여 7예, 평균연령 61.93$\pm$6.56세), II군은 15예(남 13예, 여 2예, 평균연령 59.53$\pm$6.02세)였고 두 그룹 간 술 전 변수에 따른 유의한 차이는 없었다. 심폐우회술 시간의 경우 I군이 169.36$\pm$40.28분으로 II군의 139.40$\pm$20.45분보다 유의하게(p=0.026) 길었고 환자당 요골동맥을 연속문합으로 사용한 경우 5/33 ($15.2\%$)와 l1/15 ($73.3\%$)로 II군에서 높게 나타났다(p <0.05). 근위부 문합에 사용된 정맥편은 47/117 ($40\%$)과 9/48 ($18\%$)로 I군에서 유의하게 많았고(p=0.011) 이외 수술직후의 합병증과 사망률의 차이는 없었다. 평균 추적 관찰기간은 15.87$\pm$7.33 ($1{\~}28$)개월과 21.40$\pm$2.85($17{\~}25$)개월로 II군에서 더 길었고(p=0.015) 술 후 관상동맥조영술은 I군에서 17/33 ($51.5\%$), II군에서 14/15 ($93.3\%$)에서 시행하였다. 조기 완전 개통률은 좌전하행지의 경우 15/17 ($88.2\%$)와 12/14 ($85.7\%$)로 (p=1.00) 나타났고, 요골동맥의 경우 I군에서 17/20 ($85\%$)와 II군에서 30/30 ($100\%$) (p=0.058)로 통계학적으로는 유의한 차이가 없었다. 추적 관찰 기간동안 만기사망의 경우 I군에서 1/33 ($3.0\%$), II군에서 1/15 ($6.7\%$)였다. 결론: 두 군에서 심폐우회술 시간, 환자당 연속문합의 수와 근위부 문합에 사용된 정맥편 수의 차이 이외에 임상적, 술 후 관상동맥 조영술상 통계적으로 유의한 차이는 존재하지 않았다.

• 생명과학회지
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• 제13권1호
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• pp.42-46
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• 2003

광전용적맥파는 인체의 말초 부위에서 맥파를 검출하는데 널리 이용되고 있으며 심박동수 측정 및 혈액산소포화도 측정에 이용되고 있다. 본 연구는 940 nm의 적외선을 이용한 광전용적맥파를 이용하여 손목에서 요골동맥의 맥파를 기록하였으며 센서의 측정 위치에 따라 맥파의 모양이 다르게 나타나는 것을 관찰하였다. 요골동맥 바로 위의 피부부위에서 기록되는 광전용적파는 손가락 끝에서 기록되는 맥파에 비하여 반전되어있는 특성을 보였다. 반전된 맥파의 발생기전은 센서의 발광부에서 나오는 940 nm의 적외선이 조직에 입사하여 반사되어 나오는 경로의 용적 변화가 심장주기에 따라 일어나지만 손가락 끝부분에 비하여 반대 작용이 있음을 나타낸다. 요골동맥의 바로 위 피하 조직은 심장주기에 따라 동맥의 확장 또는 수축이 발생하면 동맥외벽과 피부 사이 조직에 혈류량의 변화가 일어나며 동맥의 확장 시에는 혈류량이 감소하고 이완시에는 증가되는 특성으로 인하여 반전맥파를 형성하는 것으로 추측된다. 이러한 결과는 요골동맥의 벽에서 적외선 반사가 있음을 시사한다.

• Archives of Plastic Surgery
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• 제49권6호
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• pp.760-763
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• 2022

The dorsal metacarpal artery perforator flap is a flap that rises from the hand dorsum. Owing to its reliability and versatility, this flap is used as a workhorse for finger defect. However, to cover the radial-volar defect of the proximal interphalangeal joint (PIPJ) of the index finger, a longer flap is required than before. Here, we introduce the oblique extended reverse first dorsal metacarpal artery (FDMA) perforator flap to cover the radial-volar aspect defect of the index finger. A 45-year-old man got injured to the radial-volar defect of PIPJ of the left index finger caused by thermal press machine. The wound was 2 × 1 cm in size, and the joint and bone were exposed. We used FDMA perforator from anastomosis with palmar metacarpal artery at metacarpal neck. Since the defect was extended to the volar side, the flap was elevated by oblique extension to the fourth metacarpal base level. The fascia was included to the flap, and the flap was rotated counterclockwise. Finally, PIPJ was fully covered by the flap. Donor site was primarily closed. After 12 months of operation, the flap was stable without complication and limitation of range of motion. The oblique extended reverse FDMA perforator flap is a reliable method for covering the radial-volar defect of the PIPJ of the index finger. This flap, which also has an aesthetic advantage, will be a good choice for hand surgeons who want to cover the PIPJ defect of the index finger using a nonmicrosurgical option.