Hypertonic Saline and Mucociliary Clearance in Children

Acute Inhalation of Hypertonic Saline Does Not Improve Mucociliary Clearance in All Children With Cystic Fibrosis

Previously, the investigators and others have shown that mucociliary clearance (MCC) is defective in patients with cystic fibrosis (CF) and it is now thought that alterations in airway mucus rheology figure prominently in the impairment. Mucociliary clearance works by trapping toxic particles, bacteria and viruses in the lung mucus and then quickly removing the mucus out of the lungs. Defects in MCC typically lead to the accumulation of mucus in the airways, and this in turn is associated with acute infections, chronic bacterial colonization and chronic inflammation. One treatment strategy that is gaining acceptance as an important therapy for improving MCC in adults with CF is the inhalation of the osmotic stimulus, hypertonic saline (HS). A number of studies have shown that acute inhalation of HS (7% saline) significantly improves MCC in adults with CF and results from a recent study indicate that two weeks of inhaling HS leads to a significant increase in MCC that is sustained for 8 hours post inhalation and is associated with significant improvements in FEV1, FVC and FEF25-75 values. Since MCC in patients with CF appears to be impaired by adulthood, any drug that disrupts or slows the impairment in childhood could prove enormously beneficial in the long-term prognosis of the disease. Nevertheless, no studies have been conducted to determine if HS treatment improves MCC in children with CF. This is most problematic for physicians who care for children with CF who have normal FEV1 and FVC values, since it is unclear if they should treat these children with HS or not. This research study is designed to begin to answer this question. The investigators hypothesize that acute inhalation of hypertonic saline (7%) will improve MCC in CF children with normal pulmonary function. Our hypothesis will be tested in a one-year clinical trial that will be randomized and placebo-controlled. Twelve children with CF who are 7-12 years old and have normal FEV1 and FVC values will participate. Our goal will be to compare MCC in these children on two study visits after acute inhalations of placebo (0.12% saline) or hypertonic saline (HS) (7% saline) aerosol. The investigators predict that MCC values after acute inhalation of 7% HS aerosol will be statistically significantly greater than after placebo inhalation.

Study Overview

• Status: Completed
• Conditions: Cystic Fibrosis
• Intervention / Treatment: Drug: 7% saline; Drug: 0.12% saline

Detailed Description

Several studies report that mucociliary clearance (MCC) is impaired in adults with CF. Because MCC is an important airway defense mechanism, drugs that slow impairment of MCC in children could prove beneficial in the long-term prognosis of the disease. A few studies have shown that inhalation of hypertonic saline (HS) significantly improves MCC in adults with CF and improvement is associated with increases in pulmonary function and decreases in pulmonary exacerbations. Nevertheless, no studies have examined if HS improves MCC in CF children. This is problematic for physicians who care for CF children with normal pulmonary function, since it is unclear if they should treat with HS or not. This study was designed to begin to answer this question. Twelve children with CF (7-12 yrs; 5 males) and normal pulmonary function (FEV1 and FVC > 90% of predicted values) participated in a screening visit and two study visits. On the screening visit, children underwent an induced sputum test. On the two study visits, they inhaled 0.12% saline (placebo), or HS, in a double-blind, randomized, cross-over study. Following inhalation of placebo or HS, patients inhaled the radioisotope 99mtechnetium and underwent sequential imaging of their lungs with a gamma camera for 90 min and approximately 24 hrs later. Mucociliary clearance was quantified at 60 min (MCC60), 90 min (MCC90) and 24 hrs (MCC24hrs) after inhalation of the radioisotope. Between the 60 min and 90 min measurements, children coughed 30 times.

• Study Type: Interventional
• Enrollment (Actual): 17
• Phase: Phase 2

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 7 years to 12 years (Child)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Males and females
• Age 7-12 years old
• Diagnosis of cystic fibrosis by sweat chloride > 60 meq/L, or presence of two CFTR mutations known to cause CF
• Routinely treated with the short-acting bronchodilator albuterol
• FEV1 > 90% of predicted values

Exclusion Criteria:

• FEV1 < 90% of predicted values
• Routine use of hypertonic saline, mannitol, or amiloride
• Allergic bronchopulmonary aspergillosis (ABPA)
• Sputum colonization with Burkholderia cepacia or multiple antibiotic resistant organisms
• Evidence of a pulmonary exacerbation within past two weeks
• Treated with intravenous or oral antibiotics in the past two weeks for a pulmonary exacerbation

• Presence of an acute respiratory illness characterized by:

  • Coughing above baseline values
  • Wheezing
  • Respiratory distress
  • Hemoptysis
• Cannot perform the inhalation maneuvers that are required for drug inhalation or radioaerosol administration

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: 7% saline; 5 mL of 7% saline was inhaled once over a 20 minute period.	Drug: 7% saline; 5mL 7% saline inhaled once over 20 minutes; Other Names: hypertonic saline
Placebo Comparator: 0.12% saline; 5mL 0.12% saline inhaled once during 20 minutes	Drug: 0.12% saline; 5mL of 0.12% saline inhaled once over 20 minutes

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Percent Mucociliary Clearance at 60 Minutes	60 minutes

Secondary Outcome Measures

Outcome Measure	Time Frame
Percent Mucociliary Clearance at 90 Minutes	90 minutes

Collaborators and Investigators

• Sponsor: Johns Hopkins University
• Collaborators: Cystic Fibrosis Foundation
• Investigators: Principal Investigator: Beth L Laube, PhD, Johns Hopkins University

Publications and helpful links

General Publications

• Laube BL, Sharpless G, Carson KA, Kelly A, Mogayzel PJ Jr. Acute inhalation of hypertonic saline does not improve mucociliary clearance in all children with cystic fibrosis. BMC Pulm Med. 2011 Sep 6;11:45. doi: 10.1186/1471-2466-11-45.

Study record dates

Study Major Dates

• Study Start: July 1, 2007
• Primary Completion (Actual): June 1, 2009
• Study Completion (Actual): June 1, 2009

Study Registration Dates

• First Submitted: February 9, 2011
• First Submitted That Met QC Criteria: February 9, 2011
• First Posted (Estimate): February 10, 2011

Study Record Updates

• Last Update Posted (Estimate): September 22, 2015
• Last Update Submitted That Met QC Criteria: September 10, 2015
• Last Verified: September 1, 2015

More Information

Terms related to this study

• Keywords: children; cystic fibrosis; hypertonic saline; mucociliary clearance
• Additional Relevant MeSH Terms: Digestive System Diseases; Pathologic Processes; Respiratory Tract Diseases; Lung Diseases; Infant, Newborn, Diseases; Genetic Diseases, Inborn; Pancreatic Diseases; Fibrosis; Cystic Fibrosis
• Other Study ID Numbers: CFF Account #LAUBE06A0