- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03697122
Heated Humidified Breathing Circuit Rewarming in Hypothermic Post Cardiopulmonary Bypass Patients.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Hypothermia on admission to the intensive care unit (ICU) following cardiopulmonary bypass (CPB) is common. Cooling and rewarming during CPB and deep hypothermic circulatory arrest (DHCA) takes considerable time and contributes to the post-procedural coagulopathy and physiologic perturbations. Core body parts (trunk and head) rewarm more quickly than peripheral parts (extremities). After disconnecting from CPB the body is allowed to self equilibrate. The normal vasoconstriction response is impaired by the administered anaesthesia. Hence, heat distribution takes place from the warm core to the colder periphery. This causes an afterdrop: a decrease in the temperature of the core organs. After-drop may contribute to post-operative complications such as shivering, coagulopathy, increased myocardial stress, increased wound infections, metabolic acidosis, delayed extubation and prolonged ICU length of stay (LOS).
The use of the active warming via traditional methods (ie forced air warming blankets) and Heated Humidified breathing circuits (HHBC) via ANAPOD Heated Humidification System® (ANAPOD) may shorten time to normothermia. Secondarily it may shorten time to extubation, improve coagulopathy, and metabolic derangements seen with hypothermia.
Sample and Study Design- The investigators will prospectively collect data for 14 enrolled non-patients who will receive active warming via both forced air warming blankets and Heated Humidified breathing circuits (HHBC). Retrospective data will be obtained retrospectively for 28 matched patients from two years prior to initiation of the trial, who received warming only via forced air warming blankets.
Data Collection Plan- Data will be extracted and collected by the Duke Department of Anesthesiology IT analyst, who will review and extract information from the patient's chart via Epic/ Maestro Care, or manually if necessary.
Data Evaluation- Descriptive statistics will be used to evaluate patient demographics and clinical characteristics. Descriptive statistics will be summarized as mean ± (SD) or median (interquartile range) for continuous variables and group frequencies (%) for dichotomous or categorical variables.
As all patients are expected to achieve normothermia within the study period, the primary outcome of time to normothermia will be analyzed as a numeric outcome variable. Following validation of distributional assumptions the investigators will compare the time to normothermia between the two groups via t-test or Wilcoxon rank sum test as appropriate. It is expected that the patients will reach normothermia between 45 minutes and 6 hours after admission to the ICU.
By using a 2:1 matching ratio and a moderate level of variability (SD=1.3 hours) a study of 14 prospectively enrolled patients and 28 retrospectively matched patients would attain 82% power to detect a 1.25 hour difference between time to normothermia in the prospective group (active warming via traditional methods (ie forced air warming blankets) and Heated Humidified breathing circuits (HHBC) via ANAPOD Heated Humidification System® (ANAPOD), and the retrospective group (active warming via traditional methods (ie forced air warming blankets only) at alpha level 0.05.
Secondary numeric outcomes such as time to extubation, time to normal PH, and coagulopathy lab values will be analyzed by t-test or Wilcoxon rank sum test as appropriate. Differences in categorical outcomes between treatment groups will be analyzed via chi-square or fisher exact tests. As the patients will be matched on key confounders no further adjustment is expected to be necessary, so the moderate sample size should not limit the primary analysis. Potential subgroup analysis may be conducted in an exploratory analysis to determine if the treatment effect of ANAPOD warming is different by procedure type or patient/surgical characteristics.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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North Carolina
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Durham, North Carolina, United States, 27710
- Duke University Hospital
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Admission to intensive care unit following surgical procedure involving cardiopulmonary bypass.
- Admission temperature ≤ 35.0 C.
Exclusion Criteria:
- Patients placed on extracorporeal membrane oxygenation intra-operatively, or during first 24 hours after ICU admission.
- Any additional surgical procedures in the first 24 hours days after initial surgery e.g. Chest exploration for bleeding, Open Chest, Non-cardiac surgery such as colectomy for ischemic gut, etc.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: HHBC and Forced Air Warming
Patients admitted to intensive care unit hypothermic (≤ 35 C) following surgical procedures involving cardiopulmonary bypass.
Will be rewarmed with heated humidified breathing circuits (ANAPOD) and standard forced air warming blankets.
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Heated humidified breathing circuits (ANAPOD) will be set up and managed by respiratory therapist in standard fashion defined by the manufacturer. Temperate will be set at 41C. Forced air warming blankets will be set at 42C for duration of rewarming.
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Time to Normothermia
Time Frame: up to 24 hours post admission to intensive care unit
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Core temperature normothermia defined as >=36.5 C.
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up to 24 hours post admission to intensive care unit
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Time to Extubation
Time Frame: up to 24 hours post admission to intensive care unit
|
Time from admission to time of extubation.
Followup was truncated at 24 hours and if patient had not been extubated at that time they were assigned a value of 24 hours.
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up to 24 hours post admission to intensive care unit
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Coagulopathy as Measured by Need for Transfusion of Blood Product
Time Frame: 24 hours post admission to intensive care unit
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Assessed via number of transfusions of red blood cells, fresh frozen plasma, platelets, cryoprecipitate.
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24 hours post admission to intensive care unit
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Metabolic Derangement as Measured by Time to Normal pH
Time Frame: up to 24 hours post admission to intensive care unit
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Assessed via blood gas analysis.
Normal pH defined as 7.35-7.45.
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up to 24 hours post admission to intensive care unit
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Number of Subjects With Abnormal Coagulopathy as Measured by Laboratory Assessment of Prothrombin Time
Time Frame: 24 hours post admission to intensive care unit
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Laboratory assessment of Prothrombin Time with normal defined as 9.5-13.1 seconds.
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24 hours post admission to intensive care unit
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Number of Subjects With Abnormal Coagulopathy as Measured by Laboratory Assessment of INR
Time Frame: 24 hours post admission to intensive care unit
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Laboratory assessment of international normalised ratio (INR) with normal defined as 0.9-1.1.
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24 hours post admission to intensive care unit
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Number of Subjects With Abnormal Coagulopathy as Measured by Laboratory Assessment of Act Partial Thromboplastin Time
Time Frame: 24 hours post admission to intensive care unit
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Laboratory assessment of Act Partial Thromboplastin Time with normal defined as 26.8-37.1 seconds.
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24 hours post admission to intensive care unit
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Number of Subjects With Abnormal Coagulopathy as Measured by Laboratory Assessment of Fibrinogen.
Time Frame: 24 hours post admission to intensive care unit
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Laboratory assessment of fibrinogen levels with normal defined as 213-435 mg/dL.
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24 hours post admission to intensive care unit
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Number of Subjects With Abnormal Coagulopathy as Measured by Laboratory Assessment of Platelet Count
Time Frame: 24 hours post admission to intensive care unit
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Laboratory assessment of platelet count with normal defined as 150 - 450 x10ˆ9/L.
|
24 hours post admission to intensive care unit
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Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Negmeldeen Mamoun, MD, Duke Univeristy Hospital Anesthesia Department
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- Pro00100711
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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