LVAD Alarms Explained: What Every Patient Should Know

After implantation of a life-saving device, it is important to learn about this device. Both LVAD patients and caregivers should have complete knowledge and understanding of device functioning so that they can stay safe. One of the essential things is to understand LVAD alarms.

Your LVAD alarm is more than just a noise, as it gives you some idea of changes in the device. Every vibration, light, and beep carries a message and gives a sign so that you can take action on time. Many patients feel scared the first time an alarm goes off, but you do not need to panic once you understand the system. In this guide, you will learn what LVAD alarms mean, why they happen, how to respond to each type, and how to prevent them in the first place. You will also learn which symptoms need emergency care right away.

What Is an LVAD Alarm? Understanding the LVAD Alert System

LVAD device consists of an LVAD pump, which is implanted inside the heart, and an LVAD driveline that connects the pump inside to the external components, which include the LVAD controller and batteries. Your LVAD controller constantly checks and takes records of how the pump is working inside. It tracks the power flow, blood flow, and battery status, then it compares the information against safe ranges.  Whenever the reading falls outside that safe range, the controller triggers an alarm. Usually, the three main signals involve:

• Audible alarms with beeping sounds that can vary according to the level of urgency

• Visual indicators like lights or screen messages on the controller

• Vibration alerts that can be felt through the controller itself

Although every device is unique, for an Abbott HeartMate 3 device emergency care, the message appears on the controller’s screen in the following way:

• A yellow diamond appears, which means there is less than 15 minutes of charge remaining.

• The red battery symbol shows when only 5 minutes of charge is left, and you must take immediate action to replace it.

• Red Heart is for a hazard alarm that requires your action immediately, as it is a high-priority alarm.

• Yellow Wrench shows an advisory alarm that may not be urgent but requires your attention.

You should never ignore any of these signals. Some alarms need quick action, while others simply remind you to do routine maintenance. You just need to keep your device safe so that you can stay safe with the device.

How Does an LVAD Detect Problems?

Several components of your LVAD system work together to detect problems. Here are some of them:

LVAD controller: It is the brain of the system that reads and displays alarms.

LVAD pump: This device assists heart functioning and helps move blood through your body.

LVAD Driveline: This is the cable that connects the internal pump to the external controller.

Batteries: Each device carries two batteries that are the power source of energy.

Power Module: The unit that manages power when you plug into an outlet.

Internal System Diagnostic: This system includes software that continuously scans for errors.

Each part sends data to the controller. If any part fails or performs outside a safe limit, the controller activates the matching alarm.

Types of LVAD Alarms

Not every beep or light on your LVAD is the same, and alarms can be categorized by priority from low to high. Here are some of those types:

Low Priority Alarms

Advisory alarms give you an early warning. Your device continues to operate normally, but you will usually need to take action soon. These alarms are not emergencies and can be seen on the controller screen during routine system checks, though you should still not ignore them. Some of the examples are:

Common Examples:

• Low battery

• Battery nearing depletion

• Controller reminder

• Backup battery replacement reminder

• Driveline connection reminder

Advisory (Medium Priority) Alarm

Medium or advisory alarms need attention soon, but they are not an immediate threat to life. They can appear as a light or beeping sound, and they can vary according to the presenting condition. Some of the examples may include:

Common Examples:

• Low flow alarm when the blood flow drops below normal levels, usually under 2.5L/min

• Low Battery Alarm when the battery is running low and has less than 15 to 30 minutes remaining.

• One of the two required power sources is unplugged or has failed. Check connections and connect the loose cable to a working power source.

Hazard (High-Priority) Alarms

Hazard or high-priority alarms signal a serious problem. There can be a possible interruption of pump support. These high-priority alarms demand immediate action. You may need to resolve the problem right away by yourself, and if you cannot, it is important to contact your LVAD team or emergency services right away. Here are examples of hazard alarms:

Common Examples:

• Critical low battery

• Power disconnect

• Controller fault

• Pump stopped

• Pump restart failure

• Driveline damage

• Internal controller malfunction

How to Respond to an LVAD Alarm

Understanding LVAD alarms is necessary so that you can take the right action on time, without any inconvenience. Here are some simple steps you should follow to manage or respond to an LVAD alarm:

Step 1: Stay Calm

When you see or hear an alarm, the first thing is to stay calm and not panic, as it makes it harder for you to think clearly. When you stay calm, it will help you read the controller or understand your device so that you can take the right step.

Step 2: Understand the type of Alarm

Look at the display of the LVAD controller and understand the alarm or sign. Specify the exact alarm message and note any wording, codes, or lights. This will tell you exactly which system or which part of the device needs immediate attention.

Step 3: Identify the Alarm Type

Decide on the alarm type to categorize alarms as low- or high-priority. This helps you decide whether the alarm needs immediate attention or how much time you have to act and inform those around you. Hazardous alarms need faster action than advisory ones. 

Step 4: Take the Right Action

Check Battery Connections: Make sure every cable sits securely in place. Check if the batteries are running out of charge. Connect fully charged batteries if the charge looks low. 

Inspect the Driveline: Inspect the whole driveline from the exit site to its full length. Look for kinks, tugging, or visible damage along its full length, and handle it gently while you check it.

Check Blood Flow: The LVAD device usually beeps an alarm when it detects low blood flow. Look for the reading that shows the level of blood flow. Make necessary adjustments or take professional help if you can't restore it. 

Step 5: Assess Your Symptoms

Notice dizziness, chest pain, shortness of breath, or any other change in how you feel, since your symptoms help guide how urgently you need help.

Step 6: Contact Your LVAD Team

Call them for guidance, even if the problem seems small, and describe the alarm message and your symptoms clearly.

Step 7: Call Emergency Services When Necessary

If you don’t understand the alarm or are unable to resolve the problem, it’s time to call for help. Don't hesitate if the alarm signals a serious risk, and mention that you have an LVAD as soon as help arrives so responders know how to treat you.

Symptoms That Require Immediate Medical Attention

Call for emergency help right away if you experience any of these:

• Shortness of breath

• Chest pain

• Loss of consciousness

• Severe dizziness

• Persistent low flow alarm

• Heavy bleeding

• Stroke symptoms

• Pump stopped beeping or displaying an alarm

How to Prevent LVAD Alarms

When you understand your device correctly, it will become easier to prevent emergency situations rather than facing them. Here are some tips to prevent LVAD alarms that can be due to negligence.

• Understand your device completely and learn to manage the alarms under the guidance of your doctor so that you can manage the low- or moderate-priority alarms by yourself.

• Change batteries regularly and have a proper schedule to change and charge batteries. 

• Always keep an extra pair of fully charged batteries securely in an LVAD bag, especially when you are going outside. 

• Protect your driveline at all costs and prevent tugging by securely keeping it in an LVAD gear.

• Routinely check your LVAD equipment and report immediately if you find something unusual.

• Keep the cable connections secure and make sure they are connected all the time.

• Stay hydrated to keep your blood volume good and follow all the professional’s advice according to your unique condition.

• Attend follow-ups with your doctor so that you stay informed about your condition and your general health.

Daily LVAD Equipment Checklist

Before you leave home each day, check that you have:

• Controller

• Fully charged batteries (extra pair)

• Backup controller

• Emergency contact card

• Dressing supplies

Common Mistakes Patients Make After an LVAD Alarm

Avoid these mistakes to keep yourself and your device safe:

• Ignoring repeated alarms

• Disconnecting power incorrectly

• Delaying battery changes

• Pulling on the driveline

• Waiting too long to call the LVAD team when you don’t understand the device alarm

Living Confidently With LVAD Alarms

One of the key aspects of staying confident is having a proper understanding and complete knowledge of your device. Build your confidence through education and learn different types of alarms and their meanings. Practice emergency procedures with your caregivers and inform everyone around you whether you are in your workplace or at home. Keep your device safe while moving or performing daily activities by keeping it secure in an LVAD vest and LVAD shirt. Keep your emergency phone numbers in a card and keep it with you all the time wherever you go. Practice managing alarms; the more you practice, the more confident and calmer you will feel when an alarm sounds.

Final Thoughts

LVAD alarms exist to warn you before problems turn into emergencies. When you understand what each alarm means and respond appropriately, you protect both your safety and your device. Follow the guidance from your LVAD center, attend your follow-up visits, and never ignore an alarm that persists or comes with symptoms.

A note: Alarm names, sounds, colors, and response steps vary between LVAD models, including the HeartMate 3, HeartMate II, and the legacy HeartWare HVAD. Always follow your patient manual and the specific instructions from your LVAD center, since your device may use different terminology than another device of the patient.

Frequently Asked Questions

What is the most common LVAD alarm?

Low-battery alarms occur most often because batteries run low during normal daily use. Make a schedule to charge your batteries and note the time a fully charged battery can work before it runs out of charge.

What should I do if my LVAD alarm goes off in public?

Stay calm, check the controller display, and follow your standard response steps. Call your LVAD team if you need guidance.

Can dehydration trigger an LVAD alarm?

Yes, dehydration usually triggers an alarm, as it directly links to your blood volume. A low blood volume will be detected through the LVAD controller and can trigger an alarm.

Should I call 911 for every LVAD alarm?

Most of the LVAD alarms can be managed by yourself after understanding your device. So, you should only call 911 if you are facing a hazardous alarm or any sudden alarm that comes with serious symptoms.