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What This Guide Helps With
This guide helps troubleshoot the APNEA FLOW alarm on a Drager Apollo anesthesia machine. This alarm indicates that breathing or ventilation has stopped or that expected ventilation flow is not being detected. Possible causes include insufficient fresh-gas supply, a kinked tube, a hose system leak, a disconnected circuit, or a device-related ventilation or flow detection issue.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Treat APNEA FLOW as a patient-critical ventilation alarm.
- Immediately notify anesthesia staff.
- Make sure the patient is being ventilated manually using the breathing bag, manual mode, or another clinically appropriate backup ventilation method.
- Do not continue relying on the anesthesia machine if ventilation cannot be quickly confirmed as safe and effective.
- Remove the machine from patient use if the alarm remains active or ventilation is uncertain.
Verify the Reported Alarm and Behavior
- Confirm the exact alarm displayed is APNEA FLOW.
- Ask clinical staff when the alarm appeared, such as during automatic ventilation, manual ventilation, after a circuit change, after patient connection, or after repositioning the tube or breathing circuit.
- Check for related signs such as absent flow waveform, low or absent measured minute volume, no visible chest rise, or repeated apnea alarms after reset.
- Confirm whether the alarm is active, repeating, or historical.
Confirm Manual Ventilation and Patient Breathing Status
- Have anesthesia staff confirm whether the patient is breathing spontaneously, apneic, disconnected, or being manually ventilated.
- Verify that clinical staff have confirmed adequate chest rise and ventilation by appropriate clinical means.
- Do not troubleshoot machine settings or circuits while delaying patient ventilation support.
Check Ventilator Mode and Settings
- Review the active ventilation mode with anesthesia staff.
- Confirm that the selected mode matches the clinical setup and patient condition.
- Check respiratory rate, tidal volume or pressure setting, inspiratory pressure, trigger settings, and other ventilation parameters.
- Verify that settings should produce detectable ventilation flow.
- If settings are corrected, confirm stable ventilation and verify that the alarm clears.
Check Fresh-Gas Supply and Fresh-Gas Settings
- Verify that fresh-gas flow is turned on and set appropriately.
- Confirm that O2 supply is available from pipeline or backup cylinder as appropriate.
- Look for related alarms such as low oxygen supply, fresh-gas low, or pipeline failure.
- Confirm that the fresh-gas setting is sufficient for the selected ventilation mode and clinical use.
- If fresh-gas flow correction resolves the alarm, document the finding and confirm proper operation before returning the machine to service.
Inspect the Breathing Circuit and Hose System
- Check the breathing circuit for disconnected hoses, loose fittings, damaged tubing, or incorrect assembly.
- Verify that inspiratory and expiratory limbs are connected correctly.
- Check the patient Y-piece, breathing bag connection, filter, HME, airway adapter, absorber canister, and breathing system components.
- Make sure all components are seated correctly and free of obvious damage.
- If a loose or damaged circuit component is found, correct it and confirm ventilation and alarm clearance.
Check for Kinked, Occluded, or Restricted Tubing
- Inspect the patient tube, breathing hoses, filters, and airway adapters for kinks, compression, blockage, water accumulation, or pinched tubing.
- Check whether tubing is trapped under equipment, pulled tight, or positioned in a way that restricts flow.
- Verify that the gas flow path is open from the anesthesia machine to the patient and back through the breathing system.
- If a restriction is found and removed, confirm that ventilation resumes normally and the alarm does not return.
Check for Circuit Leak
- Inspect the hose system for leaks at the patient Y-piece, breathing circuit connections, filter or HME connection, breathing bag connection, absorber canister, and CO2 absorber seal area.
- Check the APL valve area during manual ventilation if clinically appropriate and the machine is not being relied on for active patient ventilation.
- Perform an appropriate leak check only after the machine is removed from patient use and the workflow allows safe testing.
- If a leak is found, correct the leak and verify that the machine passes the appropriate checkout before return to service.
Check Accessories and Recently Changed Components
- Ask whether the breathing circuit, filter, HME, absorber canister, sample line, patient airway adapter, breathing bag, or scavenging setup was recently changed.
- Verify that recently changed accessories are installed correctly and compatible with the setup.
- Replace or reinstall questionable accessories and confirm proper ventilation.
Isolate Whether the Issue Is External or Device-Related
- After patient safety is addressed and the machine is off the patient, verify with a known-good breathing circuit and known-good filter or HME if available.
- Confirm adequate fresh-gas supply, correct ventilator settings, no visible circuit leak, no kinked tubing, and proper machine checkout result.
- If the alarm remains after external causes are ruled out, suspect an internal ventilation, flow sensing, breathing system, or control issue.
Stop When Resolved
- If the alarm clears after correcting fresh-gas flow, ventilator settings, tubing position, hose connection, or circuit leak, confirm ventilation is stable.
- Confirm no related alarms remain active.
- Have anesthesia staff verify normal operation.
- Complete any required anesthesia machine checkout before returning the device to service.
If the Problem Persists
If APNEA FLOW continues after fresh-gas supply, ventilator settings, breathing circuit, tube condition, accessories, and leaks have been checked, external causes have been ruled out.
Remove the anesthesia machine from service.
Label the device Out of Service.
Send the unit for repair or bench evaluation.
Persistent APNEA FLOW may indicate an internal ventilation, flow sensing, breathing system, or control issue that requires service evaluation.
Clinical Use Tip
Never troubleshoot an APNEA FLOW alarm on an active patient if ventilation is not confirmed. Move the patient to a backup ventilation method first, then troubleshoot the anesthesia machine only after the patient is safe.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Drager Apollo anesthesia machine displayed APNEA FLOW alarm during use. Staff reported breathing/ventilation stopped or machine was not detecting ventilation flow."
Cause
What was observed during troubleshooting.
Example:
"Checked ventilator settings, fresh-gas setting, hose system, breathing circuit, patient tube routing, filter/HME, and possible leaks. Alarm appeared related to insufficient fresh-gas flow, kinked tubing, hose system leak, or unresolved ventilation/flow detection fault."
Resolution
What action was taken.
Example:
"Patient ventilation was supported by clinical staff. Fresh-gas setting, ventilator settings, breathing circuit, hose system, and tube were inspected. External issue was corrected if found. If APNEA FLOW persisted, machine was removed from service, labeled Out of Service, and referred for repair evaluation."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
APNEA FLOW is a patient safety alarm, not just a nuisance alarm. Start with ventilation support, then work logically through settings, fresh gas, tubing, hoses, leaks, and accessories. If the alarm remains after external causes are ruled out, remove the machine from service and escalate for repair. Clear documentation protects the patient, the technician, and the clinical team.
That is successful troubleshooting.