In July 2023, rising US basketball star Bronny James collapsed on the court during practice and was sent to hospital. The 18-year-old athlete, son of famous LA Lakers’ veteran LeBron James, had experienced a cardiac arrest.

Many media outlets incorrectly referred to the event as a “heart attack” or used the terms interchangeably.

A cardiac arrest and a heart attack are distinct yet overlapping concepts associated with the heart.

With some background in how the heart works, we can see how they differ and how they’re related.

Understanding the heart

The heart is a muscle that contracts to work as a pump. When it contracts it pushes blood – containing oxygen and nutrients – to all the tissues of our body.

For the heart muscle to work effectively as a pump, it needs to be fed its own blood supply, delivered by the coronary arteries. If these arteries are blocked, the heart muscle doesn’t get the blood it needs.

This can cause the heart muscle to become injured or die, and results in the heart not pumping properly.

Heart attack or cardiac arrest?

Simply put, a heart attack, technically known as a myocardial infarction, describes injury to, or death of, the heart muscle.

A cardiac arrest, sometimes called a sudden cardiac arrest, is when the heart stops beating, or put another way, stops working as an effective pump.

In other words, both relate to the heart not working as it should, but for different reasons. As we’ll see later, one can lead to the other.

Why do they happen? Who’s at risk?

Heart attacks typically result from blockages in the coronary arteries. Sometimes this is called coronary artery disease, but in Australia, we tend to refer to it as ischaemic heart disease.

The underlying cause in about 75% of people is a process called atherosclerosis. This is where fatty and fibrous tissue build up in the walls of the coronary arteries, forming a plaque. The plaque can block the blood vessel or, in some instances, lead to the formation of a blood clot.

Atherosclerosis is a long-term, stealthy process, with a number of risk factors that can sneak up on anyone. High blood pressure, high cholesterol, diet, diabetes, stress, and your genes have all been implicated in this plaque-building process.

Other causes of heart attacks include spasms of the coronary arteries (causing them to constrict), chest trauma, or anything else that reduces blood flow to the heart muscle.

Regardless of the cause, blocking or reducing the flow of blood through these pipes can result in the heart muscle not receiving enough oxygen and nutrients. So cells in the heart muscle can be injured or die.

But a cardiac arrest is the result of heartbeat irregularities, making it harder for the heart to pump blood effectively around the body. These heartbeat irregularities are generally due to electrical malfunctions in the heart. There are four distinct types:

• ventricular tachycardia: a rapid and abnormal heart rhythm in which the heartbeat is more than 100 beats per minute (normal adult, resting heart rate is generally 60-90 beats per minute). This fast heart rate prevents the heart from filling with blood and thus pumping adequately
• ventricular fibrillation: instead of regular beats, the heart quivers or “fibrillates”, resembling a bag of worms, resulting in an irregular heartbeat greater than 300 beats per minute
• pulseless electrical activity: arises when the heart muscle fails to generate sufficient pumping force after electrical stimulation, resulting in no pulse
• asystole: the classic flat-line heart rhythm you see in movies, indicating no electrical activity in the heart.

Cardiac arrest can arise from numerous underlying conditions, both heart-related and not, such as drowning, trauma, asphyxia, electrical shock and drug overdose. James’ cardiac arrest was attributed to a congenital heart defect, a heart condition he was born with.

But among the many causes of a cardiac arrest, ischaemic heart disease, such as a heart attack, stands out as the most common cause, accounting for 70% of all cases.

So how can a heart attack cause a cardiac arrest? You’ll remember that during a heart attack, heart muscle can be damaged or parts of it may die. This damaged or dead tissue can disrupt the heart’s ability to conduct electrical signals, increasing the risk of developing arrhythmias, possibly causing a cardiac arrest.

So while a heart attack is a common cause of cardiac arrest, a cardiac arrest generally does not cause a heart attack.

What do they look like?

Because a cardiac arrest results in the sudden loss of effective heart pumping, the most common signs and symptoms are a sudden loss of consciousness, absence of pulse or heartbeat, stopping of breathing, and pale or blue-tinged skin.

But the common signs and symptoms of a heart attack include chest pain or discomfort, which can show up in other regions of the body such as the arms, back, neck, jaw, or stomach. Also frequent are shortness of breath, nausea, light-headedness, looking pale, and sweating.

What’s the take-home message?

While both heart attack and cardiac arrest are disorders related to the heart, they differ in their mechanisms and outcomes.

A heart attack is like a blockage in the plumbing supplying water to a house. But a cardiac arrest is like an electrical malfunction in the house’s wiring.

Despite their different nature both conditions can have severe consequences and require immediate medical attention.

Michael Todorovic, Associate Professor of Medicine, Bond University and Matthew Barton, Senior lecturer, School of Nursing and Midwifery, Griffith University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

In the aftermath of the tragic Bondi knife attack, Joel Cauchi’s parents have spoken about their son’s long history of mental illness, having been diagnosed with schizophrenia at age 17. They said they were “devastated and horrified” by their son’s actions. “To you he’s a monster,” said his father. “But to me he was a very sick boy.”

Globally, one out of every eight people report a mental illness. In Australia, one in five people experience a mental illness in their lifetime.

Mental illness and distress affects not only the person living with the condition, but family members and communities. As the prevalence of mental health problems grows, the flow-on effect to family members, including caregivers, and the impact on families as a unit, is also rising.

While every family is different, the words of the Cauchis draw attention to how families can experience distress, stress, fear, powerlessness, and still love, despite the challenges and trauma. How can they help a loved one? And who can they turn to for support?

The role of caregivers

Informal caregivers help others within the context of an existing relationship, such as a family member. The care they provide goes beyond the usual expectations or demands of such relationships.

Around 2.7 million Australians provide informal care. For almost a third of these the person’s primary medical diagnosis is psychological or psychiatric.

It has long been acknowledged that those supporting a family member with ongoing mental illness need support themselves.

In the 1980s, interest grew in caregiving dynamics within families of people grappling with mental health issues. Subsequent research recognised chronic health conditions not only affect the quality of life and wellbeing of the people experiencing them, but also impose burdens that reverberate within relationships, caregiving roles, and family dynamics over time.

Past studies have shown families of those diagnosed with chronic mental illness are increasingly forced to manage their own depression, experience elevated levels of emotional stress, negative states of mind and decreased overall mental health.

Conditions such as depression, anxiety disorders, bipolar disorder, and schizophrenia can severely impact daily functioning, relationships, and overall quality of life. Living with mental illness is often accompanied by a myriad of challenges. From stigma and discrimination to difficulty accessing adequate health care and support services. Patients and their families navigate a complex and often isolating journey.

The family is a system

The concept of family health acknowledges the physical and psychological wellbeing of a person is significantly affected by the family.

Amid these challenges, family support emerges as a beacon of hope. Research consistently demonstrates strong familial relationships and support systems play a pivotal role in mitigating the adverse effects of mental illness. Families provide emotional support, practical assistance, and a sense of belonging that are vital for people struggling with mental illness.

My recent research highlights the profound impact of mental illness on family dynamics, emphasising the resilience and endurance shown by participants. Families struggling with mental illness often experience heightened emotional fluctuations, with extreme highs and lows. The enduring nature of family caregiving entails both stress and adaptation over an extended period. Stress associated with caregiving and the demands on personal resources and coping mechanisms builds and builds.

Yet families I’ve interviewed find ways to live “a good life”. They prepare for the peaks and troughs, and show endurance and persistence. They make space for mental illness in their daily lives, describing how it spurs adaptation, acceptance and inner strength within the family unit.

When treating a person with mental illness, health practitioners need to consider the entire family’s needs and engage with family members. By fostering open and early dialogue and providing comprehensive support, health-care professionals can empower families to navigate the complexities of mental illness while fostering resilience and hope for the future. Family members express stories of an inner struggle, isolation and exhaustion.

Shifting the focus

There is a pressing need for a shift in research priorities, from illness-centered perspectives to a strengths-based focus when considering families “managing” mental illness.

There is transformative potential in harnessing strengths to respond to challenges posed by mental illnesses, while also supporting family members.

For people facing mental health challenges, having loved ones who listen without judgement and offer empathy can alleviate feelings of despair. Beyond emotional support, families often serve as crucial caregivers, assisting with daily tasks, medication management and navigating the health-care system.

As the Cauchi family so painfully articulated, providing support for a family member with mental illness is intensely challenging. Research shows caregiver burnout, financial strain and strained relationships are common.

Health-care professionals should prioritise support for family members at an early stage. In Australia, there are various support options available for families living with mental illness. Carer Gateway provides information, support and access to services. Headspace offers mental health services and supports to young people and their families.

Beyond these national services, GPs, nurses, nurse practitioners and local community health centres are key to early conversations. Mental health clinics and hospitals often target family involvement in treatment plans.

While Australia has made strides in recognising the importance of family support, challenges persist. Access to services can vary based on geographic location and demand, leaving some families under-served or facing long wait times. And the level of funding and resources allocated to family-oriented mental health support often does not align with the demand or complexity of need.

In the realm of mental illness, family support serves as a lifeline for people navigating the complexities of their conditions.

If this article has raised issues for you, or if you’re concerned about someone you know, call Lifeline on 13 11 14.

Amanda Cole, Lead, Mental Health, Edith Cowan University

This article is republished from The Conversation under a Creative Commons license. Read the original article.