An arrhythmia refers to an irregularity in the heartbeat, either due to excessive slowness, excessive quickness, or disorganized beating. Though sometimes harmless and natural, they may also cause issues or even be fatal. Symptoms may include chest palpitations, heart rate changes, chest pain, difficult or discomfort while breathing, anxiety, sweating, fatigue, and unconsciousness.

Arrhythmia

Ventricular tachycardia is an arrhythmia in which the heart's lower chamber beats too quickly, improperly distributing oxygenated blood. It can lead to chest palpitations, low blood pressure, chest pain, shortness of breath, fainting, dizziness and lightheadedness, or even cardiac death via ventricular fibrillation.

Ventricular Tachycardia (V-Tach, VT)

Sinus tachycardia refers to a heartbeat of over 100 beats per minute. While this is typically a response to stress and not a cause for concern, it can sometimes arise without an immediate explanation which may be indicative of other underlying health conditions. Symptoms may include chest palpitations and pain, shortness of breath, fatigue, dizziness, and fainting. While it can generally be managed with a healthy lifestyle, some people may require medication, medical procedures, or therapy to control their sinus tachycardia. 

Sinus Tachycardia

Supraventricular tachycardia, or SVT, refers to a tachycardia or abnormally elevated heart rate that causes the heart to pump before its chambers have filled with oxygenated blood. Women and those who smoke, drink, use caffeine, and/or struggle with anxiety are at increased risk. Symptoms may include chest pain and palpitations, dizziness, shortness of breath, fainting, and cardiac arrest. Though it can often be managed with a healthy lifestyle, SVT sometimes requires treatment with medication or medical procedures.

Supraventricular Tachycardia (SVT)

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Mitral valve prolapse--also known as billowing mitral valve syndrome, Barlow syndrome, floppy valve syndrome, myxomatous mitral valve disease, and click-murmur syndrome--refers to a condition in which the leaflets of the heart's mitral valve are not stiff enough, prolapsing during heart contractions. This sometimes causes mitral valve regurgitation where blood flows backwards into the left atrium from the left ventricle. Though usually manageable without treatment, it can sometimes cause lightheadedness, arrhythmias, breathing difficulties, and fatigue.

Mitral Valve Prolapse

Stress cardiomyopathy--also known as apical ballooning syndrome (ABS), takotsubo cardiomyopathy, and broken heart syndrome--is a condition that affects part of the heart in response to high physical or mental stress and extreme emotions, causing symptoms reminiscent of a heart attack including chest pain and shortness of breath. It is most common among older adults, women, and those with a history of mental illness. Although it is often a transient condition, it can sometimes recur or cause issues like low blood pressure, pulmonary edema, arrhythmias, heart failure, and rarely, death

Stress/Takotsubo Cardiomyopathy (Broken Heart Syndrome)

Purging via self-induced vomiting or abuse of laxatives or diuretics leave bulimia nervosa patients particularly vulnerable to electrolyte imbalances such as hypokalemia and resulting acid-base disorders. These imbalances may result in QT prolongation and potentially fatal arrhythmias. Patients who abuse ipecac to induce vomiting may suffer from  permanent conduction problems and cardiomyopathy since it contains emetine, a cardiotoxic alkaloid. Stimulant abuse can lead to palpitations, sinus tachycardia, and arrhythmias such as supraventricular tachycardia. Diet pill abuse is similarly associated with heart arrhythmias.

Bulimia Nervosa Cardiovascular Complications

Hypokalemia occurs when the blood contains too little potassium. Common causes of hypokalemia are a potassium-deficient diet or purging of ingested food. Urine potassium-to-creatinine ratios of <13 are often indicative that hypokalemia is resultant from eating disorder behaviors. If serum potassium levels are 2.5 mmol/L or more and no symptoms of hypokalemia are present, it can be treated with oral potassium supplements and purging cessation in bulimia nervosa patients. However, if serum potassium levels are <2.5mmol/L, potassium supplementation must be provided both orally and intravenously in a saline solution drip at no greater than 50-75mL/hr to restore intravascular volume while preventing hyperkalemia. Severe hypokalemia can lead to QT prolongation, TdP, other arrhythmias, and rarely, acute renal failure via hypokalemic nephropathy. 

Hypokalemia in Eating Disorder Patients

Heart Arrhythmia - Symptoms and Causes. (2023, October 13). Mayo Clinic. Retrieved January 24, 2024, from https://www.mayoclinic.org/diseases-conditions/heart-arrhythmia/symptoms-causes/syc-20350668

Heart Arrhythmia - Symptoms and Causes

Cardiac tamponade refers to an excessive fluid buildup in the pericardium that prevents the heart from properly functioning. The heart's chambers cannot fully expand to fill with blood, which may result in tachycardia and a drop in blood pressure. Symptoms include chest pain, breathing difficulties, fatigue, abdominal and leg swelling, fainting, blue or gray skin, heart palpitations, and changes in affect or behavior. If left untreated, cardiac tamponade can cause death.

Cardiac Tamponade

Acute heart failure refers to a condition in which the heart's function is suddenly impaired, causing it to beat too weakly to effectively transport oxygenated blood throughout the body. Heart disease can lead to acute heart failure via cardiac structural changes such as narrowed blood vessels, enlarging of the heart itself, stiffening of its muscles, etc. Symptoms include chest pain and tightness, difficulties or discomfort with breathing, cough, swelling in the extremities, and unconsciousness, and must be met with emergency medical care immediately.

Acute Heart Failure

Analyze the following patient scenario and provide the most likely diagnosis, explaining the key factors that support your conclusion.

Cardiomyopathy Diagnosis

A patient's QTc interval reflects the time it takes for ventricular depolarization and repolarization to occur, measured from the beginning of the QRS complex to the end of the T wave, corrected for their heart rate. In other words, it represents the time needed for the heart to reset between beats.

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