• Title/Summary/Keyword: QT

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QT-interval prolongation due to medication found in the preoperative evaluation

  • Seto, Mika;Koga, Sayo;Kita, Ryosuke;Kikuta, Toshihiro
    • Journal of Dental Anesthesia and Pain Medicine
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    • v.17 no.4
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    • pp.323-327
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    • 2017
  • QT prolongation is an electrocardiographic change that can lead to lethal arrhythmia. Acquired QT prolongation is known to be caused by drugs and electrolyte abnormalities. We report three cases in which the prolonged QT interval was improved at the time of operation by briefly discontinuing the drugs suspected to have caused the QT prolongation observed on preoperative electrocardiography. The QTc of cases 1, 2, and 3 improved from 518 to 429 ms, 463 to 441 ms, and 473 to 443 ms on discontinuing the use of a gastrointestinal prokinetic agent, a proton pump inhibitor, and a molecular targeted drug, respectively. These cases were considered to have drug-induced QT prolongation. We reaffirmed that even drugs administered for conditions unrelated to cardiac diseases can have adverse side effect of QT prolongation. In conclusion, our cases indicate that dental surgeons should be aware of the dangerous and even potentially lethal side effects of QT prolongation. For safe oral and maxillofacial surgery, cooperation with medical departments in various fields is important.

A Study On the Beat-To-Beat QT Interval Measurement

  • Jung, T.S.;Lee, J.M.;Park, K.S.
    • Proceedings of the KOSOMBE Conference
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    • v.1998 no.11
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    • pp.203-204
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    • 1998
  • ECG analysis is main techniques for diagnosing heart disease. In recent, some studies have been performed about detection of QT interval. But, it's difficult to detect QT interval because T wave is evasive. In this paper, we have detected peak point and end point of T wave and calculated QT interval. And the result has been compared with the other algorithm after detection of QT interval.

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A New RFID Tag Anti-Collision Algorithm Using Collision-Bit Positioning (충돌 비트 위치를 활용한 RFID 다중 태그 인식 알고리즘)

  • Lee Hyun-Ji;Kim Jong-Deok
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.4A
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    • pp.431-439
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    • 2006
  • RFID Anti-Collision technique is needed to avoid collision problem caused by Radio interference between tags in the same RFID Reader area. It affects the performance and reliability of the RFID System. This paper propose the QT-CBP(Query Tree with Collision-Bit Positioning) Algorithm based on the QT(Query Tree) algorithm. QT-CBP Algorithm use precise collision bit position to improve the performance. We demonstrated the proposed algorithm by simulation. Our algorithm outperformed when each tag bit streams are the more duplicate and the number of tags is increased, compared with QT.

Wireless Ordering System For Embedded (무선 임베디드 주문 시스템)

  • Kim, min-seong;Cho, sang-hee;Jeong, seong-cheol;Lee, sang-gyu;Hong, kyung-ho
    • Proceedings of the Korea Contents Association Conference
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    • 2008.05a
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    • pp.569-572
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    • 2008
  • I proposed wireless ordering system using Qt embedded. This system will make the good use of real life applications and make fit for practical use. I embodied data input, transfer, gathering and back-transfer on wireless network using TCP/IP protocol on QSocket provided by Qt. Server environment is Linux 9.0 and gcc-2.95.3 on PC, and three target-boards consist PXA255 processor with wireless-LAN card which communicate through wireless access pointer. Software tools on target-board are gcc, tmake, qt-X11, qt-embedded and etc. I designed touch-screen interface for user convenience.

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Performance Analysis of WAP Packet Considering Multi-Slot SAR-QT Algorithm in Bluetooth Ad hoc Network (Bluetooth Ad hoc 망에서 멀티 슬롯 SAR-QT 알고리즘을 고려한 WAP 패킷의 성능 분석)

  • Moon, Il-Young;Roh, Jae-Sung;Cho, Sung-Joon
    • Journal of Advanced Navigation Technology
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    • v.6 no.2
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    • pp.158-167
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    • 2002
  • In this paper, it is analyzed that WAP packet transmission time to improve performance of WAP using SAR-QT algorithm in Bluetooth channel. The order for SAR-QT algorithm to improve the transfer capability, it is fragmented in WTP total messages that are coming down from upper layer and then the packets are sent one at time in baseband. And it is studied that transmission time for WAP over Bluetooth according to DMI, DM3 or DM5 packet type using SAR-QT algorithm in Bluetooth piconet environment. This SAR-QT algorithm decreases WAP packet transmission time of L2CAP baseband packets by sending packet that are spanning multiple slots. From the results, in WAP over Bluetooth channels, it is found out that WTP packet size ought to be increased to decrease transmission time of WAP packet. In addition, considering BER in wireless channel, optimal WTP packet size is achieved for WAP over Bluetooth in a Rician fading environment.

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Clinical Experience for a Patient with Long QT Syndrome -A case report- (QT간격연장증후군(Long QT Syndrome) 환자의 치료경험 -증례 보고-)

  • Park, Tae-Kyu;Lee, Jung-Koo
    • The Korean Journal of Pain
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    • v.13 no.1
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    • pp.115-118
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    • 2000
  • Stellate ganglion block is most commonly used in pain clinic because it is an easy procedure and it has broad indications reported that Angina pectoris, tachyarrhythmia and long QT syndrome (LQTS) are indicated. LQTS is a disorder of the abnormalities of cardiac sympathetic innervation and of myocardial repolarization. LQTS is characterized by marked prolongation of the QT interval, often manifestating as syncope, seizures, or sudden death due to polymorphic ventricular tachyarrhythmia known as torsades de pointes. Treatment of symptomatic patients usually begin with beta blocker. The elective treatment of LQTS patients unresponsive to beta blocker is the left cardiac sympathetic denervation. We report a case of LQTS patient who had received stellate ganglion block.

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Pain medication and long QT syndrome

  • Klivinyi, Christoph;Bornemann-Cimenti, Helmar
    • The Korean Journal of Pain
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    • v.31 no.1
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    • pp.3-9
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    • 2018
  • Long QT syndrome is a cardiac repolarization disorder and is associated with an increased risk of torsades de pointes. The acquired form is most often attributable to administration of specific medications and/or electrolyte imbalance. This review provides insights into the risk for QT prolongation associated with drugs frequently used in the treatment of chronic pain. In the field of pain medicine all the major drug classes (i.e. NSAIDs, opioids, anticonvulsive and antidepressant drugs, cannabinoids, muscle relaxants) contain agents that increase the risk of QT prolongation. Other substances, not used in the treatment of pain, such as proton pump inhibitors, antiemetics, and diuretics are also associated with long QT syndrome. When the possible benefits of therapy outweigh the associated risks, slow dose titration and electrocardiography monitoring are recommended.

Query Tree Algorithm for Energy Conserving and Fast Identification in RFID Systems

  • Lim, In-Taek
    • Journal of information and communication convergence engineering
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    • v.5 no.4
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    • pp.311-315
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    • 2007
  • This paper proposes a revised query tree algorithm in RFID systems. The proposed QT_ecfi algorithm revises the QT algorithm, which has a memory-less property. In the QT_ecfi algorithm, the tag will send the remaining bits of their identification codes when the query string matches the first bits of their identification codes. When the reader receives all the responses of the tags, it knows which bit is collided. If the collision occurs in the last bit, the reader can identify two tags simultaneously without further query. While the tags are sending their identification codes, if the reader detects a collision bit, it will send a signal to the tags to stop sending. According to the simulation results, the QT_ecfi algorithm outperforms the QT algorithm in terms of the number of queries and the number of response bits.

A Case of Amisulpride Induced QT Prolongation (Amisulpride 중독과 QT 간격 연장 1례)

  • Lee Choung Ah;Park Hyeon Soo;Min Young Gi;Kim Gi Woon
    • Journal of The Korean Society of Clinical Toxicology
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    • v.3 no.2
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    • pp.135-138
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    • 2005
  • Amisulpride is a newly developed atypical antipsychotic agent effective in treating the positive and negative symptom of schizophrenia. Over-dose of amisulpride can cause hypocalcemia and thus may lead to QT prolongation. We report a case of hypocalcemia and QT prolongation. The QT prolongation was normalized after calcium supplement.

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A revised Query Tree Protocol for Tag Identification in RFID Systems (RFID 시스템에서 태그 식별을 위한 개선된 쿼리 트리 프로토콜)

  • Lim, In-Taek
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.2
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    • pp.491-494
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    • 2005
  • In this paper, a QT_rev protocol is proposed for identifying all the tags within the identification range. The proposed QT_rev protocol revises the QT protocol, which has a memoryless property. In the QT_rev protocol, the tag will send the remaining bits of their identification codes when the query string matches the first bits of their identification codes. After the reader receives all the responses of the tags, it knows which bit is collided. If the collision occurs in the last bit, the reader can identify two tags simultaneously without further query.

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