High Flow Therapy for the Treatment of Respiratory Failure in the ED

Not Applicable

Completed

Conditions: Acute Respiratory Failure

Interventions: Device: Noninvasive positive pressure ventilation (NIPPV)
Device: Vapotherm

Registration Number: NCT02236559

Lead Sponsor: Vapotherm, Inc.

Brief Summary: The overall objective of this study is to determine if Vapotherm high flow nasal cannula therapy (HFT), when used to treat respiratory failure in the ED, is at least equivalent to the current standard of care for non-invasive ventilatory support, non-invasive positive pressure mask ventilation (NIPPV). Moreover, this study will investigate the potential that HFT has possible advantages over NIPPV, such as decreased time to patient stability from respiratory failure, and the ease of use as a first line intervention for respiratory failure in the ED environment.

The hypothesis is that HFT via the Vapotherm Precision Flow will demonstrate clinical non-inferiority when compared to NIPPV with regard to treatment failure by way of an impact on ventilation indices and a lower intolerance rate, and have a positive association with hospital disposition and length of stay.

Detailed Description: Not available

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 204

Inclusion Criteria

Adult patients (> 18 yrs of age)
Presentation with acute respiratory failure according to the following criteria:
If any of these are present: Respiratory Rate >22 or labored; Suspected Acute Respiratory Acidosis, as defined as pH <7.32 on initial blood gas(either arterial or venous); Hypoxemia, as defined as Pulse Ox <92%;
Clinical decision to escalate therapy to non-invasive ventilatory support, or to maintain non-invasive ventilatory support if delivered to the ED on such.

Exclusion Criteria

Suspected drug overdose
Cardiovascular instability as demonstrated by hypotension relative to initial clinical presentation that requires immediate intervention
End stage cancer
Life expectancy < 6 months
Respiratory arrest or significant respiratory depression on presentation
Glasgow Coma Scale score < 9
Cardiac arrest on initial presentation
Need for emergent intubation
Known or suspected cerebrovascular accident
Known or suspected ST segment elevation myocardial infarction
Patients with increased risk of pulmonary aspiration
Agitation or uncooperativeness

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Noninvasive positive pressure ventilation	Noninvasive positive pressure ventilation (NIPPV)	Patients will be fit with an oronasal mask using a fitting gauge that will be applied by a respiratory therapist or other clinician skilled in management of NIPPV. Initial pressures will be at low end of suggested range but can be increased as rapidly as necessary to alleviate respiratory distress. Targets should be to lower respiratory rate to the low 20s and achieve tidal volumes of 6-8 ml/kg ideal body weight. If patients find pressures uncomfortably high, they can be lowered as necessary by 1 to 2 cmH2O decrements to enhance tolerance. EPAP (PEEP) can also be adjusted upward as needed to reduce triggering effort (by counterbalancing auto-PEEP) or to improve oxygenation. FIO2 will be 1.0 initially to assure adequate oxygenation, but should be adjusted promptly to maintain an FIO2 of no greater than 0.6 with an EPAP (PEEP) of not more than 10 cm H2O to maintain a PaO2 \> 88%.
High flow therapy	Vapotherm	Patients will be fit with a Vapotherm adult nasal cannula that will be applied by a respiratory therapist or other clinician skilled in management of HFT. Initial flow will be set to 35 L/min but can be decreased or increased as rapidly as necessary to alleviate respiratory distress and optimize patient comfort. Targets should be to lower respiratory rate to the low 20s and with a HFT flow rate between 20 to 35 L/min. Starting temperature will be between 35 to 37 C; if patients find the gas temperature to be uncomfortable, it can be lowered as necessary down to 33 C to enhance tolerance. FIO2 will be 1.0 initially to assure adequate oxygenation, but should be adjusted promptly to maintain an FIO2 of no greater than 0.6 to maintain a PaO2 \> 88%.

Primary Outcome Measures

Name	Time	Method
Treatment Failure Rate	Within 72 hrs	Determine the efficacy of HFT compared to NIPPV in treating respiratory failure. The primary endpoint will be treatment failure within 72 hrs as determined by intubation.

Secondary Outcome Measures

Name	Time	Method
Ventilatory Indices 9	At one and four hours	Evaluate the capability of HVNI, compared to NIPPV, to affect indices of ventilation. The secondary endpoint is the degree of physiologic improvement in blood oxygen and CO2 levels that signify a reduction in both hypoxemia and/or hypercapnia. Blood gas (base excess), a measure of blood oxygen/CO2 levels, recorded at one and four hours, and at treatment failure if applicable. NOTE: Due to test error, the number analyzed is less than the total patients in the trial.
Ventilatory Indices 1	At one and four hours baseline, 30min, 1 hr, 90 min, and 4 hrs (if still on therapy) and at treatment failure/intubation (if applicable).	Evaluate the capability of high velocity nasal insufflation (HVNI), compared to non-invasive positive pressure ventialtion (NIPPV), to affect indices of ventilation. The secondary endpoint is the degree of physiologic improvement in blood oxygen and CO2 levels that signify a reduction in both hypoxemia and/or hypercapnia.
Ventilatory Indices 7	At one and four hours	Evaluate the capability of HVNI, compared to NIPPV, to affect indices of ventilation. The secondary endpoint is the degree of improvement in blood oxygen and CO2 levels that signify a reduction in both hypoxemia and/or hypercapnia. Blood gas (PCO2), a measure of CO2, recorded at one and four hours, and at treatment failure if applicable. NOTE: Due to test error, the number analyzed is less than the total patients in the trial.
Ventilatory Indices 8	At one and four hours	Evaluate the capability of HVNI, compared to NIPPV, to affect indices of ventilation. The secondary endpoint is the degree of physiologic improvement in blood oxygen and CO2 levels that signify a reduction in both hypoxemia and/or hypercapnia. Blood gas (HCO3), a meausre of blood oxygen/CO2 levels, recorded at one and four hours, and at treatment failure if applicable. NOTE: Due to test error, the number analyzed is less than the total patients in the trial.
Ventilatory Indices 2	At baseline, 30 minutes, 60 minutes, 90 minutes, 4 hours, and treatment failure if applicable	Evaluate the capability of high velocity nasal insufflation (HVNI), compared to non-invasive positive pressure ventilation (NIPPV), to affect indices of ventilation. The secondary endpoint is the degree of physiologic improvement in blood oxygen and CO2 levels that signify a reduction in both hypoxemia and/or hypercapnia. Respiratory rate recorded at one and four hours, and at treatment failure if applicable.
Ventilatory Indices 3	At one and four hours baseline, 30min, 1 hr, 90 min, and 4 hrs (if still on therapy) and at treatment failure/intubation (if applicable).	Evaluate the capability of high velocity nasal insufflation (HVNI), compared to non-invasive positive pressure ventilation (NIPPV), to affect indices of ventilation. The secondary endpoint is the degree of improvement in blood oxygen and CO2 levels that signify a reduction in both hypoxemia and/or hypercapnia. SpO2 (a measurement of blood oxygen) recorded at baseline, 30min, 1 hr, 90 min, and 4 hrs (if still on therapy) and at treatment failure/intubation (if applicable).
Ventilatory Indices 6	At one and four hours	Evaluate the capability of HVNI, compared to NIPPV, to affect indices of ventilation. The secondary endpoint is the degree of improvement in blood oxygen and CO2 levels that signify a reduction in both hypoxemia and/or hypercapnia. Blood gas (pH), a measurement of CO2 levels, recorded at one and four hours, and at treatment failure if applicable. NOTE: Due to test error, the number analyzed is less than the total patients in the trial.
Length of Stay	Duration of hospital visit	Evaluate the capability of HVNI, compared to NIPPV, to affect average length of stay.
Ventilatory Indices 4	At one and four hours baseline, 30min, 1 hr, 90 min, and 4 hrs (if still on therapy) and at treatment failure/intubation (if applicable).	Evaluate the capability of HFT, compared to NIPPV, to affect indices of ventilation. Patient discomfort as rated on a VAS recorded at one and four hours baseline, 30min, 1 hr, 90 min, and 4 hrs (if still on therapy) and at treatment failure/intubation (if applicable).. NOTE: Due to need for patients to be alert and provide this rating, the number analyzed is less than the total patients in the trial. VAS: Visual Analogue Scale. A Likert scale of facial expressions ranging from a smiley face to a frowning face used to assess the subjects' subjective level of dyspnea. Minimum 0 (no discomfort) to Maximum 5 (maximum discomfort).
Ventilatory Indices 5	at baseline, 30min, 1 hr, 90 min, and 4 hrs (if still on therapy) and at treatment failure/intubation (if applicable)	Evaluate the capability of HVNI, compared to NIPPV, to affect indices of ventilation. The secondary endpoint is the degree of physiologic improvement in blood oxygen and CO2 levels that signify a reduction in both hypoxemia and/or hypercapnia. Modified Borg score recorded at baseline, 30min, 1 hr, 90 min, and 4 hrs (if still on therapy) and at treatment failure/intubation (if applicable). NOTE: Due to the need for patients to be alert and able to provide this score, the number analyzed is less than the total patients in the trial. A modified Borg scale was used to ask the patient to describe their effort on a scale of 0 to 10, where 10 is extreme discomfort.

Trial Locations

Locations (5): Athens Regional Medical Center
🇺🇸
Athens, Georgia, United States
Erlanger Health System
🇺🇸
Chattanooga, Tennessee, United States
Memorial Hermann Hospital
🇺🇸
Houston, Texas, United States
Memorial Hermann The Woodlands
🇺🇸
The Woodlands, Texas, United States
McLeod Regional Medical Center
🇺🇸
Florence, South Carolina, United States