Cardiac Limitations in Chronic Obstructive Pulmonary Disease: Benefits of Bronchodilation

Phase 4

Completed

Conditions: Chronic Obstructive Pulmonary Disease
COPD

Interventions: Drug: Placebo
Drug: Tiotropium

Registration Number: NCT00578968

Lead Sponsor: Mayo Clinic

Brief Summary: This study is being done to examine the influence of Tiotropium (good or bad) on heart function at rest and during exercise in patients with moderate to severe chronic obstructive pulmonary disease (COPD).

Detailed Description: Patients who develop chronic obstructive pulmonary disease (COPD) have a loss of elastic recoil of the lungs, have remodeling in the airways and pulmonary vasculature, develop inhomogeneities in ventilation (VA) and perfusion (Qc) and gradually lose their reserves for producing expiratory flow, particularly over the mid to lower lung volumes. As a result, they develop air trapping, have slowed expiration, and gradually hyperinflate with a large residual volume, an exaggerated total lung capacity, reduced vital capacity, and markedly reduced maximal expiratory flows. With exercise, patients with moderate to severe COPD are further challenged by the need for increased ventilation. Expiring against the narrowed airways results in breathing at higher and higher lung volumes until the elastic load on inspiration increases the work and cost of breathing to the point where exercise discontinues. It remains controversial if this scenario leads to primarily dyspnea from the weak and heavily recruited inspiratory muscles, inspiratory muscle fatigue or if a primary limitation might be related to the relatively large cardiac output required for the respiratory muscles, at the expense of the locomotor muscles, resulting in leg fatigue. The expiratory load also increases intrathoracic pressure and reduces the gradient for venous return, thus having the potential to reduce cardiac output. Pulmonary hypertension develops and may influence blood flow to the left side of the heart further inhibiting cardiac output. The ineffective inspiratory pressure generation by the diaphragm may also reduce the typical benefits of the respiratory muscle pump on venous return and the marked hyperinflation may influence left ventricular filling due to competition for intrathoracic space. Thus, although COPD primarily influences the respiratory system, we believe it has profound effects on cardiac function, and during exercise this may play a particular limitation. Use of a long-acting anticholinergic agent such as Tiotropium partially reverses airway obstruction (expiratory load) and hyperinflation, both potentially improving cardiovascular function. The focus of this research will be to determine influence of Tiotropium on cardiac parameters measured both at rest and during exercise.

The focus of this study was to determine the influence of Tiotropium (Spiriva) on cardiac parameters measured both at rest and during exercise. More specifically, we first examined cardiac function in a group of COPD patients and healthy age and gender matched controls. Our hypothesis was that at rest cardiac function would be similar between groups; however, with light and heavier exercise, there would be evidence for a blunted stroke volume and perhaps cardiac output in the COPD patients. Second, we compared in a placebo-controlled double blinded manner cardiac function with and without chronic use of tiotropium in age, gender, and disease matched COPD patients. Our hypothesis was that in the Tiotropium (Spiriva) group at a matched workload, the reduced obstruction would allow for improved cardiac function, specifically an increase in stroke volume and reduction in heart rate. The interactions in this population between metabolic demand, fitness, lung mechanics, and cardiovascular function are complicated and thus studies were pursued at matched workloads and heart rate as well as with heavier exercise in an attempt to discriminate a primary influence of altered obstruction on cardiovascular function.

The participants will be asked to come to the Cardiopulmonary Research Laboratory on 4 occasions (separate visits) for exercise testing (typically over the course of 2 to 4 weeks). Each session will take approximately 1-4 hours to complete and in the COPD population, visits will be repeated after receiving placebo or Tiotropium for 4 weeks.

All of the exercise testing will be performed on an exercise bicycle either in the upright or semi-supine (recumbent) position and the participant will wear a SCUBA-type mouthpiece and a nose clip to analyze expired air. In addition, an EKG will be used to monitor heart rate and rhythm.

Visit 1 (Screening Visit): During the first visit, participants will have a brief exam by a pulmonary physician. The exam will include a complete blood count (CBC) to rule out anemia, baseline spirometry to assess lung volumes and flow rates to meet entry criteria, and in women of childbearing potential a pregnancy test. They will also be taken off theophylline and inhaled anticholinergics, but allowed to continue long acting inhaled beta agonists (LABA) or short acting beta agonist (SABA) for a rescue medication. Subjects on long acting inhaled beta agonists will be asked to discontinue this medication temporarily, 48 hr. prior to each study visit, but restarted upon completion of the visit.

Visit 2: A minimum of 48 hours after the first visit, participants will return for complete measures of lung volumes, flow rates, and diffusing capacity of the lung for carbon monoxide (DLCO), a baseline echocardiogram and a maximal exercise test on a cycle ergometer. Before the exercise begins, participants will have one or two small balloon(s) (2 inches long, deflated) attached to a small plastic tube (the width of a pencil tip) inserted through the nasal cavity and into the esophagus. This is done to measure respiratory muscle work. Participants will receive a numbing gel (2% lidocaine) to numb the nasal passage and upper esophagus prior to insertion of the balloon(s). During the insertion of the esophageal balloons, participants will also be asked to swallow water to minimize gagging and assure correct balloon placement in the esophagus. Participants will also be asked to breathe a mixture of gases containing acetylene (0.6%), dimethyl ether (1.8%), oxygen (21%, same as room air), helium (9%) and nitrogen (69.4%). The mixture of gases will be inhaled at various time points over the course of the exercise session for 8 to 10 breaths at a time. This is done to non-invasively measure cardiac output.

Visit 3: Visit 3 will involve steady-state semi-recumbent cycling exercise at two steady-state exercise intensities; 40 percent of peak work and (after a brief rest) an intensity eliciting a heart rate of 110 beats per minute (to standardize diastolic duration). Before the exercise begins, participants will have one or two small balloon(s) (2 inches long, deflated) attached to a small plastic tube (the width of a pencil tip) inserted through the nasal cavity and into the esophagus. This is done to measure respiratory muscles at work. Participants will receive a numbing gel (2% lidocaine) to numb the nasal passage and upper esophagus prior to insertion of the balloon(s). During the insertion of the esophageal balloons, participants will also be asked to swallow water to minimize gagging and assure correct balloon placement in the esophagus. Participants will also be asked to breathe a mixture of gases containing acetylene (0.6%), dimethyl ether (1.8%), oxygen (21%, same as room air), helium (9%) and nitrogen (69.4%). The mixture of gases will be inhaled at various time points over the course of the exercise session for 8 to 10 breaths at a time. This is done to non-invasively measure cardiac output. Also during the session, a sonographer will use ultrasound to measure cardiac pressures and volumes.

Visit 4: Visit 4 will involve steady-state exercise at 70% of peak work. Before the exercise begins, participants will have one or two small balloon(s) (2 inches long, deflated) attached to a small plastic tube (the width of a pencil tip) inserted through the nasal cavity and into the esophagus. This is done to measure respiratory muscles at work. Participants will receive a numbing gel (2% lidocaine) to numb the nasal passage and upper esophagus prior to insertion of the balloon(s). During the insertion of the esophageal balloons, participants will also be asked to swallow water to minimize gagging and assure correct balloon placement in the esophagus. Participants will also be asked to breathe a mixture of gases containing acetylene (0.6%), dimethyl ether (1.8%)oxygen (21%, same as room air), helium (9%) and nitrogen (69.4%). The mixture of gases will be inhaled at various time points over the course of the exercise session for 8 to 10 breaths at a time. This is done to non-invasively measure cardiac output.

Upon completion of these baseline visits, the COPD patients will be randomly assigned to a standard dose of Tiotropium once-daily (18 µg) or placebo for 4 weeks (or until study completion as visits 2-4 may require 1-2 wks to complete). Patients otherwise will receive usual care, except (as noted) for discontinuing other anticholinergic bronchodilators and theophylline. They will also discontinue long acting beta agonists for 48 hours prior to performing each of the designated visits. At the end of this intervention period, the procedures outlined in Visits 2-4 will be repeated (on the COPD patients only). All post intervention visits will be timed so that the primary measures will be made 1.5 to 2 hrs post dose of Tiotropium.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 36

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Placebo	Placebo	Participants with chronic obstructive pulmonary disease randomized to this arm received a once daily oral inhalation of placebo powder to match the standard active comparator dose.
Tiotropium	Tiotropium	Participants with chronic obstructive pulmonary disease randomized to this arm received a once daily oral inhalation of 18 mcg tiotropium powder.

Primary Outcome Measures

Name	Time	Method
Pretreatment Peak Exercise CI	first visit of first study period	Cardiac index (CI): A cardiodynamic measure based on the cardiac output, which is the amount of blood the left ventricle ejects into the systemic circulation in one minute, measured in liters per minute (l/min). Cardiac output is indexed to a patient's body size by dividing by the body surface area (m\^2) to yield the cardiac index.
Baseline Resting Cardiac Index (CI)	First visit of first study period	Cardiac index: A cardiodynamic measure based on the cardiac output, which is the amount of blood the left ventricle ejects into the systemic circulation in one minute, measured in liters per minute (l/min). Cardiac output is indexed to a patient's body size by dividing by the body surface area (m\^2) to yield the cardiac index.
Baseline Resting Stroke Volume Index (SVI)	first visit of first study period	Stroke volume - the volume of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume. The stroke volume index is a method of relating the stroke volume to the size of the person by dividing the stroke volume by the body surface area (BSA) (m\^2).
Pretreatment Peak Exercise SVI	first visit of first study period	Stroke volume - the volume of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume. The stroke volume index is a method of relating the stroke volume to the size of the person by dividing the stroke volume by the BSA (m\^2).

Secondary Outcome Measures

Name	Time	Method
Baseline Resting Forced Vital Capacity (FVC)	First visit of first study period	Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inspiration. A person's vital capacity can be measured by a spirometer which can be a wet or regular spirometer. In combination with other physiological measurements, the vital capacity can help make a diagnosis of underlying lung disease.
Baseline Resting FVC as Percentage of Predicted Forced Vital Capacity (FVC)	First visit of first study period	Predicted normal values for vital capacity can be calculated online (based on previous research) and depends on age, sex, height, weight and ethnicity. Percentage was calculated by observed FVC/predicted FVC X 100.
Baseline Resting Forced Expiratory Volume in 1 Second (FEV_1)	first visit of first study period	FEV_1 is the volume exhaled during the first second of a forced expiratory maneuver started from the level of total lung capacity.
Baseline Resting FEV_1 as Percentage of Predicted FEV_1	first visit of first study period	Predicted normal values for Forced Expiratory Volume in 1 second can be calculated online (based on previous research) and depends on age, sex, height, weight and ethnicity. Percentage was calculated by observed FEV_1/predicted FEV_1 X 100.
Baseline Heart Rate (HR) for All COPD Participants Versus Healthy Control Groups	first visit of first study period, second visit of first study period	Heart rate is the number of heartbeats per unit of time, typically expressed as beats per minute (bpm). Heart rate was measured in the first study period prior to the intervention at resting and at peak exercise states.
Baseline Peak Exercise Maximal Oxygen Consumption (VO_2)	second visit of first study period	VO_2 is the maximum capacity of an individual's body to transport and use oxygen during incremental exercise.
Baseline Peak Exercise Cardiac Index (CI)	second visit of first study period	Cardiac index: A cardiodynamic measure based on the cardiac output, which is the amount of blood the left ventricle ejects into the systemic circulation in one minute, measured in liters per minute (l/min). Cardiac output is indexed to a patient's body size by dividing by the body surface area (m\^2) to yield the cardiac index.
Baseline Peak Exercise Stroke Volume Index (SVI)	second visit of first study period	Stroke volume - the volume of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume. The stroke volume index is a method of relating the stroke volume to the size of the person by dividing the stroke volume by the BSA (m\^2).
Pretreatment Resting Forced Vital Capacity (FVC)	First study visit of first study period	Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inspiration. A person's vital capacity can be measured by a spirometer which can be a wet or regular spirometer. In combination with other physiological measurements, the vital capacity can help make a diagnosis of underlying lung disease.
Pretreatment Resting FVC as Percentage of Predicted FVC	First visit of first period	Predicted normal values for vital capacity can be calculated online (based on previous research) and depends on age, sex, height, weight and ethnicity. Percentage was calculated by observed FVC/predicted FVC X 100.
Percent Change in Resting FVC Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inspiration. A person's vital capacity can be measured by a spirometer which can be a wet or regular spirometer. In combination with other physiological measurements, the vital capacity can help make a diagnosis of underlying lung disease. Percentage change = final value - initial value/initial value x 100
Pretreatment Resting FEV_1	first study visit of first study period	FEV_1 is the volume exhaled during the first second of a forced expiratory maneuver started from the level of total lung capacity.
Percent Change in Resting FEV_1 Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	FEV_1 is the volume exhaled during the first second of a forced expiratory maneuver started from the level of total lung capacity. Percentage change = final value - initial value/initial value x 100
Pretreatment Resting CI	first study visit of first study period	Cardiac index (CI): A cardiodynamic measure based on the cardiac output, which is the amount of blood the left ventricle ejects into the systemic circulation in one minute, measured in liters per minute (l/min). Cardiac output is indexed to a patient's body size by dividing by the body surface area (m\^2) to yield the cardiac index.
Percent Change in Resting CI Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	Cardiac index (CI): A cardiodynamic measure based on the cardiac output, which is the amount of blood the left ventricle ejects into the systemic circulation in one minute, measured in liters per minute (l/min). Cardiac output is indexed to a patient's body size by dividing by the body surface area (m\^2) to yield the cardiac index. Percentage change = final value - initial value/initial value x 100
Pretreatment Resting SVI	first study visit of first study period	Stroke volume - the volume of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume. The stroke volume index is a method of relating the stroke volume to the size of the person by dividing the stroke volume by the BSA (m\^2).
Percent Change in Resting SVI Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	Stroke volume - the volume of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume. The stroke volume index is a method of relating the stroke volume to the size of the person by dividing the stroke volume by the BSA (m\^2). Percentage change = final value - initial value/initial value x 100
Pretreatment Heart Rate (HR) in Tiotropium and Placebo Groups	first study visit of first study period	Heart rate is the number of heartbeats per unit of time, typically expressed as beats per minute (bpm). Heart rate was measured in the first study period prior to the intervention at resting and at peak exercise states.
Percent Change in Resting HR Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	Heart rate is the number of heartbeats per unit of time, typically expressed as beats per minute (bpm). Percentage change = final value - initial value/initial value x 100
Pretreatment Peak Exercise Maximal Oxygen Consumption (VO_2)	first visit of first study period	VO_2 is the maximum capacity of an individual's body to transport and use oxygen during incremental exercise.
Percent Change in Peak Exercise VO_2 Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	VO_2 is the maximum capacity of an individual's body to transport and use oxygen during incremental exercise. Percentage change = final value - initial value/initial value x 100
Percent Change in Peak Exercise CI Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	Cardiac index (CI): A cardiodynamic measure based on the cardiac output, which is the amount of blood the left ventricle ejects into the systemic circulation in one minute, measured in liters per minute (l/min). Cardiac output is indexed to a patient's body size by dividing by the body surface area (m\^2) to yield the cardiac index. Percentage change = final value - initial value/initial value x 100
Percent Change in Peak Exercise SVI Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	Stroke volume - the volume of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume. The stroke volume index is a method of relating the stroke volume to the size of the person by dividing the stroke volume by the BSA (m\^2). Percentage change = final value - initial value/initial value x 100
Percent Change in Peak Exercise HR Between Pretreatment in First Study Period and Post-treatment in Second Study Period	first visit of first study period, first visit of second study period (approximately 6 weeks later)	Heart rate is the number of heartbeats per unit of time, typically expressed as beats per minute (bpm). Percentage change = final value - initial value/initial value x 100