Clearance Of Mucus In Stents (COMIS)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01370278
Recruitment Status : Active, not recruiting
First Posted : June 9, 2011
Last Update Posted : July 3, 2018
Information provided by (Responsible Party):
M.D. Anderson Cancer Center

Brief Summary:
The goal of this clinical research study is to compare the effects of sodium bicarbonate to normal saline when used for clearing mucus blockage in patients with airway stents.

Condition or disease Intervention/treatment Phase
Lung Neoplasms Respiratory Failure Pneumonia Acute Coronary Syndromes Unstable Angina Myocardial Infarction Cardiac Arrhythmia Thromboembolic Disease Other: Normal Saline Other: Sodium Bicarbonate Not Applicable

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Detailed Description:

Study Agents:

Sodium bicarbonate is also called baking soda. In this study it will be mixed with water.

Normal saline is a salt water solution.

Study Groups:

If you agree to take part in this study, you will be randomly assigned (as in the flip of a coin) to 1 of 2 study groups. The study doctor will use either sodium bicarbonate or normal saline during your bronchoscopy to clear mucus from your stent:

  • If you are in Group 1, the study doctor will use sodium bicarbonate. The amount of sodium bicarbonate in the solution will be the same for all patients in Group 1.
  • If you are in Group 2, the study doctor will use normal saline.

You will have an equal chance of being assigned to either group. Neither you nor the study staff can choose the group you will be in, and neither you nor your doctor will know if you are receiving sodium bicarbonate or normal saline. However, if needed for your safety, the study staff will be able to find out what you are receiving.

If you have more than 1 stent, only 1 of your stents will be checked for clearance of mucus in this study. However, all stents will be cleared of mucus if needed.

As part of your standard of care, you will have photographs and videos taken before and after your bronchoscopy. You will sign a separate consent form for your bronchoscopy. Your complete medical history will also be recorded.

For the bronchoscopy, you will be given drugs to help you relax, and then a local anesthetic will be sprayed into your nose and throat to numb those areas. A slim, flexible tube with a light will be placed through your nose or mouth and into your airway tubes.

If you are in Group 1, a small amount of sodium bicarbonate will be sprayed into your stent/airway tubes and then suctioned out through the bronchoscope.

If you are in Group 2, a small amount of normal saline will be sprayed into your stent/airway tubes and then suctioned out through the bronchoscope.

Next, 3 study doctors will check how well the mucus in your stent was cleared. If the study doctors think not enough mucus has been cleared from your stent, you will "crossover" into the other study group and receive the other agent to clear your mucus.

Length of Study:

Your participation on the study will be over after you have completed the follow-up visits.


At about 7 days, and then again 30 days after your bronchoscopy, you will come to the clinic for a follow-up visit. The following procedures will be performed:

  • You will have a physical exam, including measurement of your vital signs (blood pressure, heart rate, temperature, and breathing rate).
  • You will also be asked about any side effects you may be having.

This is an investigational study. Normal saline and sodium bicarbonate are agents used in bronchoscopies performed in patients with airway stents as standard of care. The comparison of sodium bicarbonate to normal saline to clear mucus from airway stents is considered investigational.

Up to 40 patients will take part in this study. All will be enrolled at MD Anderson.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 43 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Diagnostic
Official Title: Clearance Of Mucus In Stents (COMIS)
Actual Study Start Date : June 16, 2011
Estimated Primary Completion Date : June 2019
Estimated Study Completion Date : June 2020

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: Normal Saline
Normal saline sprayed into stent/airway tubes then suctioned out through bronchoscope.
Other: Normal Saline
Normal saline administered in stent/airway tubes under direct visualization via the bronchoscope.
Other Name: Salt water

Active Comparator: Sodium Bicarbonate
Sodium bicarbonate sprayed into stent/airway tubes then suctioned out through bronchoscope.
Other: Sodium Bicarbonate
4.2% bicarbonate solution mixed with equal volume of sterile water administered into stent/airway tubes under direct visualization via the bronchoscope.
Other Name: Baking soda

Primary Outcome Measures :
  1. Percentage of obstruction resolution as Good or Excellent [ Time Frame: Baseline to 7 days ]
    Response/efficacy of sodium bicarbonate versus normal saline in airway stents graded using scale. Percentage of obstruction resolution (relative to initial stent lumen obstruction by mucus): Good response 51-75% clearance; and Excellent 76 - 100% clearance. The Mantel-Haenszel chi-square test stratified by degree of lumen obstruction at study enrollment used to compare response (good or excellent obstruction resolution) rates between treatment arms.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  1. Adult patients (>/= 18 years) with airway stents undergoing bronchoscopy.
  2. Patients previously enrolled, but excluded as no stent lumen obstruction from mucus retention identified at earlier enrollment (hence excluded at that enrollment) .

Exclusion Criteria:

  1. Patients with history of allergy or adverse reactions to sodium bicarbonate or normal saline.
  2. Patients refusing to sign informed written consent for participation in research.
  3. Patients with no stent lumen occlusion from mucus impaction as determined at the time of the initial visual bronchoscopic assessment.
  4. Previously enrolled patients who completed this protocol.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01370278

United States, Texas
University of Texas MD Anderson Cancer Center
Houston, Texas, United States, 77030
Sponsors and Collaborators
M.D. Anderson Cancer Center
Principal Investigator: Carlos A. Jimenez, MD M.D. Anderson Cancer Center

Additional Information:
Responsible Party: M.D. Anderson Cancer Center Identifier: NCT01370278     History of Changes
Other Study ID Numbers: 2010-0990
NCI-2011-01119 ( Registry Identifier: NCI CTRP )
First Posted: June 9, 2011    Key Record Dates
Last Update Posted: July 3, 2018
Last Verified: June 2018

Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No

Keywords provided by M.D. Anderson Cancer Center:
Central airway obstruction
lumen obstruction
Sodium bicarbonate
Baking soda
Normal saline
Salt water
Airway stents
mucus obstruction

Additional relevant MeSH terms:
Myocardial Infarction
Acute Coronary Syndrome
Respiratory Insufficiency
Lung Neoplasms
Angina, Unstable
Arrhythmias, Cardiac
Pathologic Processes
Myocardial Ischemia
Heart Diseases
Cardiovascular Diseases
Vascular Diseases
Lung Diseases
Respiratory Tract Diseases
Respiratory Tract Infections
Respiration Disorders
Respiratory Tract Neoplasms
Thoracic Neoplasms
Neoplasms by Site
Angina Pectoris
Chest Pain
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms