- ICH GCP
- 미국 임상 시험 레지스트리
- 임상시험 NCT01716962
Effects of Positive End-expiratory Pressure and Tidal Volume on Fluid Responsiveness of Acute Respiratory Distress Syndrome
Effects of Positive End-expiratory Pressure and Tidal Volume on Fluid Responsiveness of Acute Respiratory Distress Syndrome.
연구 개요
상세 설명
In septic critically ill mechanically ventilated patients with acute circulatory failure, inadequate volume resuscitation leads to multiple organ failure. Early goal-directed therapy emphasizes early and aggressive hemodynamic support in patients with severe sepsis and septic shock. On the other hand, because of increased microvascular permeability and capillary leakage, conservative fluid management and more aggressive restriction in fluid accumulation to reduce lung water and tissue edema has been suggested by acute respiratory distress syndrome net. Fluid responsiveness refers to the ability of the heart to increase its stroke volume in response to volume load. Accurately predicting volume responsiveness will be beneficial in obviating the need for unnecessary fluid loading, and in detecting patients who may benefit from a volume load.
By inducing cyclic changes in pleural and transpulmonary pressure, mechanical ventilation results in cyclic changes in the preload and afterload, and therefore, the cyclic variation in systolic and pulse pressure. Recently, a systemic review concluded that dynamic preload indicator [pulse pressure variation (PPV), stroke volume variation (SVV)] are highly accurate in predicting volume responsiveness in critically ill patients. However, this technique is limited to patients who receive controlled ventilation with adequate tidal volume (> 8 ml/Kg) and sedation or paralysis is needed to abolish the spontaneous ventilation.
For acute respiratory distress syndrome patients, protective ventilatory strategy suggested low tidal volume to 6 ml/Kg. On the contrary, high PEEP needed for acute respiratory distress syndrome to prevent VALI induces a leftward shift to the steep pat of the Frank-Starling curve and increase the fluid responsiveness. Whether the dynamic preload indicators (PPV and SVV) are still effective in acute respiratory distress syndrome patients for predicting fluid responsiveness remain controversial.
Passive leg raising (PLR), by inducing a gravitational transfer of blood from the lower part of the body toward the central circulatory compartment, can be considered as a brief "self volume challenge". Recently, a systemic review and meta-analysis concluded that PLR-induced changes in cardiac output reliably predict fluid responsiveness regardless of ventilation mode, underlying cardiac rhythm and technique of measurement and can be recommended for routine assessment of fluid responsiveness in the majority of ICU population. More importantly, this prediction remains very valuable in patients with cardiac arrhythmias or spontaneous breathing activity.
Respiratory variations in the pulse oximeter plethysmographic waveform amplitude (ΔPOP) have been shown to be able to predict fluid responsiveness in mechanically ventilated patients. The main advantage of this index is that it is noninvasive, widely available, and inexpensive. Perfusion index (PI), the percentage between the infrared pulsatile and nonpulsatile signal, reflects the amplitude of the pulse oximeter waveform. Recently, Pleth Variability Index (PVI), derived from perfusion index, affords a continuous monitoring of ΔPOP. PVI has been shown to be correlated to ΔPOP and PPV and has been demonstrated to be equivalent to SVV as a predictor of fluid responsiveness in ventilated patients during major surgery. However, whether the PVI can predict the fluid responsiveness in acute respiratory distress syndrome necessitating low tidal volume and high PEEP is not clear.
Because of the aforementioned contrasting effects of low tidal volume and high PEEP on the prediction of fluid responsiveness, the aim of this study is to compare the relative predicting power of the dynamic preload indicator (PPV, SVV), passive leg raising test, and PVI on the fluid responsiveness of acute respiratory distress syndrome ventilated with various PEEP levels or various tidal volumes.
연구 유형
등록 (예상)
연락처 및 위치
연구 장소
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Taipei, 대만, 10507
- Chang Gung memorial hospital
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부수사관:
- Kuo-Chin Kao, MD
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연락하다:
- Chung-Chi Huang, MD
- 전화번호: 2281 033281200
- 이메일: cch4848@adm.cgmh.org.tw
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참여기준
자격 기준
공부할 수 있는 나이
건강한 자원 봉사자를 받아들입니다
연구 대상 성별
샘플링 방법
연구 인구
설명
Inclusion Criteria: Clinical signs of inadequate tissue perfusion were defined
- systolic blood pressure< 9 mmHg(or a decrease > 50 mmHg in previously hypertensive patients)
- need of vasopressive drugs(dopamine > 5 ug/Kg/min or norepinephrine)
- urine output<0.5 mL/Kg/hr for at least 2 hrs
- tachycardia (heart rate >100/min)
- presence of skin mottling.
Exclusion Criteria:
- patient with spontaneous respiratory activity
- cardiac arrhythmia
- known intracardiac shunt
- contraindication for passive leg raising(PLR),e.g.,pelvic trauma
- unstable spine injuries or leg amputation
- hemodynamic instability during the procedure,defined by a variation in heart rate or blood pressure of>10%over the 15-min period before starting the protocol
- Patients of renal failure necessitate renal replacement therapy will be excluded also.
공부 계획
연구는 어떻게 설계됩니까?
디자인 세부사항
코호트 및 개입
그룹/코호트 |
개입 / 치료 |
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ARDS with acute circulatory failure
acute respiratory distress syndrome with acute circulatory failure with infusion of 6% tetrastarch for a total of 500ml
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연구는 무엇을 측정합니까?
주요 결과 측정
결과 측정 |
측정값 설명 |
기간 |
---|---|---|
increase of cardiac output after volume expansion
기간: 4 hours
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Patients are classified to be volume expansion responders or nonresponders according to whether the volume expansion induced cardiac index increase at the end of hydroxyethyl starch infusion is ≧15% or < 15% of baseline cardiac index.
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4 hours
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공동 작업자 및 조사자
수사관
- 수석 연구원: Chung-Chi Huang, MD, Chang Gung memorial hospital
연구 기록 날짜
연구 주요 날짜
연구 시작
기본 완료 (예상)
연구 등록 날짜
최초 제출
QC 기준을 충족하는 최초 제출
처음 게시됨 (추정)
연구 기록 업데이트
마지막 업데이트 게시됨 (추정)
QC 기준을 충족하는 마지막 업데이트 제출
마지막으로 확인됨
추가 정보
이 연구와 관련된 용어
키워드
추가 관련 MeSH 약관
기타 연구 ID 번호
- CGMF IRB 100-4473A3
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