Flow therapy most commonly refers to Enhanced External Counterpulsation (EECP), a noninvasive treatment that uses inflatable cuffs on your legs to push blood back toward your heart. It’s primarily used for people with chronic chest pain from coronary artery disease who can’t undergo surgery or haven’t responded to other treatments. A full course typically involves 35 one-hour sessions spread over several weeks.
The term “flow therapy” can also refer to high-flow nasal cannula oxygen therapy used in hospital settings, or occasionally to psychological interventions based on the concept of “flow states.” This article focuses on EECP, since that’s the treatment most people encounter when searching for flow therapy in a medical context.
How EECP Works
During a session, you lie on a padded table while large cuffs (similar to blood pressure cuffs) are wrapped around your calves, thighs, and buttocks. These cuffs inflate and deflate in sync with your heartbeat, monitored through EKG sensors. When your heart relaxes between beats, the cuffs squeeze your lower body in a wave pattern from calves upward, pushing oxygen-rich blood back toward the heart and coronary arteries. When the heart beats again, the cuffs instantly deflate so your heart can pump with less resistance.
This repeated squeezing does two things. In the short term, it increases blood flow to the heart muscle during the resting phase of each heartbeat. Over a full course of treatment, the mechanical pressure encourages the body to open up small blood vessels and develop new pathways for blood to reach areas of the heart that aren’t getting enough supply. Think of it as training your circulatory system to build detour routes around blocked arteries.
What a Session Feels Like
Before your first session, you’ll change into special treatment pants and empty your bladder. You then lie back on the table, and a technician attaches the cuffs and EKG leads. As the cuffs inflate, you’ll feel a firm, rhythmic squeezing around your legs and hips. The sensation takes some getting used to, but it shouldn’t be painful. Many people read, watch TV, or nap during their hour-long sessions.
The standard protocol is one session per day, five days a week, for seven weeks (35 total sessions). Some programs offer twice-daily sessions to shorten the overall timeline. Each session lasts about an hour, and you can return to normal activities immediately afterward. The treatment is done in an outpatient clinic under a physician’s supervision.
Who Qualifies for Flow Therapy
EECP is specifically designed for people with severe, disabling angina (chest pain from coronary artery disease) who have limited options. Medicare has covered the treatment since 1999, but the eligibility criteria are narrow. You typically need to meet all of these conditions:
- Severe angina classified as Class III or IV on the Canadian Cardiovascular Society scale, meaning chest pain that significantly limits everyday activities or occurs at rest
- Not a good candidate for surgery because your condition is inoperable, your coronary anatomy isn’t suited for procedures like bypass or stenting, or you have other health conditions that make surgery too risky
- Referral from a cardiologist or cardiothoracic surgeon confirming that standard treatments haven’t worked or aren’t feasible
Medicare and most private insurers do not cover EECP for other cardiac conditions outside these criteria. If you’re exploring this treatment, your cardiologist will need to document why surgical options aren’t appropriate for your situation.
How Well It Works
A study published in the American Journal of Cardiology followed 363 patients with severe angina and reduced heart function through a full course of EECP. After completing treatment, 72% improved from severe angina to either no angina or only mild symptoms. More than half were able to stop using nitroglycerin, a medication commonly taken to relieve acute chest pain episodes.
The benefits weren’t just short-lived. At the two-year follow-up, 55% of patients still maintained their improvement in angina symptoms, and quality-of-life gains held up as well. These results are notable because these patients had already failed to respond to medications and weren’t candidates for surgery, meaning they had few other options available.
Not everyone responds equally. Some patients notice improvement partway through the 35-session course, while others don’t see full benefits until after completing treatment. A smaller percentage don’t experience meaningful relief at all.
Safety and Side Effects
EECP is considered low-risk compared to invasive cardiac procedures. The most common complaints are mild and temporary: skin irritation or chafing where the cuffs press against the legs, and occasional muscle soreness similar to what you’d feel after a vigorous leg workout. These issues usually resolve as your body adjusts over the first few sessions.
Certain conditions disqualify you from EECP. People with aortic aneurysms, severe peripheral artery disease, blood clots in the legs, uncontrolled irregular heart rhythms, or significant valve problems are generally not candidates. Pregnancy also rules it out. Your cardiologist will screen for these before starting treatment.
Other Meanings of Flow Therapy
High-Flow Nasal Cannula Therapy
In hospital and critical care settings, “flow therapy” sometimes refers to high-flow nasal cannula (HFNC) oxygen delivery. This system pushes warmed, humidified oxygen through nasal prongs at flow rates up to 60 liters per minute, far more than a standard oxygen mask. It’s used for patients with acute respiratory failure, including those recovering from surgery, coming off a ventilator, or experiencing severe breathing difficulties from conditions like COPD or COVID-19. HFNC reduces the need for intubation in many cases: one study found reintubation rates of only 4.9% with high-flow therapy compared to 12.2% with conventional oxygen after extubation. This is a hospital-based treatment, not something prescribed for outpatient use.
Flow State in Psychology
Outside of medicine entirely, “flow” refers to a psychological concept described by Mihály Csíkszentmihályi: a state of complete absorption in an activity where time seems to disappear and performance feels effortless. Some therapists incorporate flow-inducing activities into treatment plans for depression or anxiety, but “flow therapy” isn’t an established clinical term in psychology. It’s more of a wellness concept than a formal treatment.