Episode 215: Meth-associated HFrEF.  

Abishak and Zat (medical students) explain the cardiotoxic effect of methamphetamine and the diagnosis and treatment of heart failure with reduced ejection fraction (HFrEF). Dr. Arreaza adds insight into the reversibility of meth-associated HFrEF.  

Written by Abishak Govindarajan, MSIV and Zat Akbar Shaw. American University of the Caribbean. Edits and comments by Hector Arreaza, MD.

Welcome

Dr. Arreaza: Welcome to Rio Bravo qWeek. My name is Hector Arreaza, family physician, faculty and associate program director of the Clinica Sierra Vista/Rio Bravo Family Medicine Residency Program. Today we will explore heart failure with reduced ejection fraction, a high-yield and clinically relevant topic in medicine. We will discuss the role of methamphetamine use in the development of HFrEF. This is a pressing issue because about 0.8% of the population 12 and older in the US reported using methamphetamine within the past 12 months in 2024 (National Survey on Drug Use and Health, NSDUH), that’s about ≈2.4 million people!We are joined by two aspiring physicians who will help explore this topic. By the way, we will refer to methamphetamine in this episode as “meth”. [Abishak and Akbar introduce themselves]

Abishak: [Introduce yourself]

The role of meth in HFrEF
Dr. Arreaza: Meth is a growing problem in many places, including Bakersfield, where we live. Meth is also known as Meth Crystal, Poor man’s cocaine, Ice, Glass, Crank, Speed, Chalk, and Tina. How does meth contribute to the development of HFrEF?
Abishak: So, first, let's understand how methamphetamine works. It has a chemical structure similar to dopamine and norepinephrine, and it gets taken up through the neuron transporter proteins. Once it enters the synaptic vesicles (storage sacs for neurotransmitters), it displaces and forces the release of large amounts of dopamine, norepinephrine, and serotonin into the synapse (the space between neurons). Additionally, meth blocks the reuptake of those neurotransmitters into the neuron, ensuring they remain in the synapse for a prolonged period. All this causes a downstream effect of increased sympathetic pathways in the body.

Diagnosis
Dr. Arreaza: The diagnosis starts with collecting a good history and performing a complete physical exam, and then we confirm with an echocardiogram. 

Abishak: Yes, diagnosis requires both symptoms consistent with heart failure and objective evidence of reduced ejection fraction. Echocardiography is the primary diagnostic tool. We also measure BNP. In certain cases, cardiac MRI is used to evaluate myocardial fibrosis and exclude infiltrative or inflammatory etiologies. Coronary angiography may be performed if ischemic disease is suspected.
Guideline-Directed Medical Therapy
Dr. Arreaza: GDMT Guideline-Directed Medical Therapy started around 1987 when ACE inhibitors were proven to improve mortality in patients with heart failure. Then, during the following decades, many medications have been added to GDMT. Until around 2019–2022 we came out with the main 4 groups of medications that we know as GDMT. Let’s talk about GDMT.

Akbar: There are four core pillars in GDMT.
First, an angiotensin receptor-neprilysin inhibitor, such as sacubitril with valsartan (Entresto), is preferred over ACE inhibitors when tolerated. This medication reduces mortality and heart failure hospitalizations.
Second, evidence-based beta blockers including carvedilol, metoprolol succinate, or bisoprolol are used to reduce sympathetic overactivity and improve ventricular remodeling.
Third, mineralocorticoid receptor antagonists such as spironolactone or eplerenone reduce fibrosis and improve survival.
The Fourth pillar is SGLT2 inhibitors such as dapagliflozin or empagliflozin, which provide significant reductions in heart failure hospitalizations and cardiovascular mortality, regardless of diabetes status.
Abishak: Other main parts of the treatment are diuretics, which are used for symptom control but do not reduce long-term mortality.
Dr. Arreaza: As a recap: The current 4 pillars of GDMT are: ARNI/ACEi + β-blocker + MRA + SGLT2i) 

Beta Blocker Considerations
Dr. Arreaza: Sometimes we may be concerned about using beta blockers in active meth users. What did you read about it?
Abishak: Historically, there was concern about unopposed alpha stimulation. However, in chronic heart failure, beta blockers remain essential. Carvedilol is often favored because it provides both alpha and beta blockade. Careful titration and close monitoring are critical.
Reversibility and Remodeling
Dr. Arreaza: Regarding meth-associated HFrEF, we have good news for meth users. Tell us about how reversible this condition is. 
Akbar: It can be reversible. One of the most important aspects of this condition is that significant reverse remodeling may occur if the patient stops methamphetamine use and adheres to medical therapy. The Left ventricular ejection fraction can improve substantially and, in some cases, normalize. On the other end of the spectrum, continued meth use may lead to progressive fibrosis, ventricular dilation, and potentially irreversible damage, leading to death.
Complications of meth-associated HFrEF
Abishak: These patients are at increased risk for ventricular arrhythmias, sudden cardiac death, left ventricular thrombus formation, and progressive pulmonary hypertension. If the ejection fraction remains below 35 percent after at least three months of optimized therapy, implantable cardioverter-defibrillator (known as ICD) placement should be considered for primary prevention.
Addiction Treatment as Core Therapy
Dr. Arreaza: It sounds like GDMT cannot be done without talking about meth use disorder treatment.
Akbar: Absolutely. Treating the myocardium without addressing the substance use disorder is ineffective. Primary care providers can be trained to manage addictions, but if resources are available, you can place a referral to addiction medicine, psychiatric support, behavioral therapy, and social support services. This is an essential part of the treatment. Sustained abstinence is the single most powerful predictor of recovery.
Prognosis
Abishak: Prognosis is highly dependent on abstinence. Patients who stop using methamphetamine often experience meaningful improvement in EF and even return to normal. 

Dr. Arreaza: Yes, the key factor is complete abstinence, plus standard heart failure treatment. If the damage is mostly functional and inflammatory, recovery is possible. If there is extensive fibrosis (scar)
recovery is less likely. Observational studies have shown that patients with meth-associated cardiomyopathy who stop using meth have significant improvement in EF over 3–12 months, fewer hospitalizations, and lower mortality.

Akbar: Absolutely. Not all meth-associated cardiomyopathy behaves the same way. The extent of fibrosis determines recovery potential. Cardiac MRI with late gadolinium enhancement can help us estimate scar burden. Patients with minimal fibrosis often have better improvement with abstinence and medical therapy.

Dr. Arreaza: So, MRI can actually help us determine the prognosis.

Abishak: Yes, very much so. If MRI shows extensive fibrosis, the likelihood of full EF recovery is lower. That information helps us counsel patients more accurately.

Akbar: Another key issue is right ventricular involvement. Methamphetamine can affect both ventricles. When the right ventricle fails, patients may develop severe peripheral edema, ascites, and hepatic congestion. Right ventricular dysfunction also worsens prognosis significantly.

Dr. Arreaza: And pulmonary hypertension can also worsen the whole picture. 

Akbar: That’s correct. Meth is associated with pulmonary arterial hypertension independently of left-sided heart failure. In some patients, you may see a combined picture of both pulmonary vascular disease and right ventricular dysfunction. That can make management more complicated because pulmonary pressures may remain elevated even after EF improves.

Dr. Arreaza: Tells us about the role of BNP in monitoring these patients. 

Abishak: Serial BNP levels can help track response to therapy. Additionally, troponin may be elevated at times in meth users due to myocardial injury. Monitoring renal function is critical because many heart failure medications affect kidney function and potassium levels.

Akbar:Other lifestyle modifications include sodium restriction, regular follow-ups, vaccination, and avoidance of other cardiotoxic substances such as alcohol or cocaine. Sleep disorders, especially OSA, should be evaluated because untreated OSA worsens heart failure outcomes.

Dr. Arreaza: WhatIs there any role for wearable devices or remote monitoring?

Abishak: Yes, increasingly so. Remote weight monitoring, blood pressure tracking, and symptom reporting can reduce hospitalization. In select patients, implantable hemodynamic monitors may help detect rising filling pressures before symptoms occur.

Dr. Arreaza: It was a great discussion. Thank you, Abishak and Akbar for bringing all that valuable information to us. Let’s wrap it up.