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Magnetic resonance imaging (MRI) is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body. MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body. MRI does not involve X-rays or the use of ionizing radiation, which distinguishes it from computed tomography (CT) and positron emission tomography (PET) scans. MRI is a medical application of nuclear magnetic resonance (NMR) which can also be used for imaging in other NMR applications, such as NMR spectroscopy.
Cardiomyopathy is a group of primary diseases of the heart muscle. Early on there may be few or no symptoms. As the disease worsens, shortness of breath, feeling tired, and swelling of the legs may occur, due to the onset of heart failure. An irregular heart beat and fainting may occur. Those affected are at an increased risk of sudden cardiac death.
Echocardiography, also known as cardiac ultrasound, is the use of ultrasound to examine the heart. It is a type of medical imaging, using standard ultrasound or Doppler ultrasound. The visual image formed using this technique is called an echocardiogram, a cardiac echo, or simply an echo.
Myocarditis, also known as inflammatory cardiomyopathy, is an acquired cardiomyopathy due to inflammation of the heart muscle. Symptoms can include shortness of breath, chest pain, decreased ability to exercise, and an irregular heartbeat. The duration of problems can vary from hours to months. Complications may include heart failure due to dilated cardiomyopathy or cardiac arrest.
An ejection fraction (EF) is the volumetric fraction of fluid ejected from a chamber with each contraction. It can refer to the cardiac atrium, ventricle, gall bladder, or leg veins, although if unspecified it usually refers to the left ventricle of the heart. EF is widely used as a measure of the pumping efficiency of the heart and is used to classify heart failure types. It is also used as an indicator of the severity of heart failure, although it has recognized limitations.
Perfusion is the passage of fluid through the circulatory system or lymphatic system to an organ or a tissue, usually referring to the delivery of blood to a capillary bed in tissue. Perfusion may also refer to fixation via perfusion, used in histological studies. Perfusion is measured as the rate at which blood is delivered to tissue, or volume of blood per unit time per unit tissue mass. The SI unit is m3/(s·kg), although for human organs perfusion is typically reported in ml/min/g. The word is derived from the French verb "perfuser" meaning to "pour over or through". All animal tissues require an adequate blood supply for health and life. Poor perfusion (malperfusion), that is, ischemia, causes health problems, as seen in cardiovascular disease, including coronary artery disease, cerebrovascular disease, peripheral artery disease, and many other conditions.
Prostate biopsy is a procedure in which small hollow needle-core samples are removed from a man's prostate gland to be examined for the presence of prostate cancer. It is typically performed when the result from a PSA blood test is high. It may also be considered advisable after a digital rectal exam (DRE) finds possible abnormality. PSA screening is controversial as PSA may become elevated due to non-cancerous conditions such as benign prostatic hyperplasia (BPH), by infection, or by manipulation of the prostate during surgery or catheterization. Additionally many prostate cancers detected by screening develop so slowly that they would not cause problems during a man's lifetime, making the complications due to treatment unnecessary.
Cardiomegaly is a medical condition in which the heart becomes enlarged. It is more commonly referred to simply as "having an enlarged heart". It is usually the result of underlying conditions that make the heart work harder, such as obesity, heart valve disease, high blood pressure (hypertension), and coronary artery disease. Cardiomyopathy is also associated with cardiomegaly.
Tachycardia-induced cardiomyopathy (TIC) is a disease where prolonged tachycardia or arrhythmia causes an impairment of the myocardium, which can result in heart failure. People with TIC may have symptoms associated with heart failure and/or symptoms related to the tachycardia or arrhythmia. Though atrial fibrillation is the most common cause of TIC, several tachycardias and arrhythmias have been associated with the disease.
Restrictive cardiomyopathy (RCM) is a form of cardiomyopathy in which the walls of the heart are rigid. Thus the heart is restricted from stretching and filling with blood properly. It is the least common of the three original subtypes of cardiomyopathy: hypertrophic, dilated, and restrictive.
Magnetic resonance elastography (MRE) is a form of elastography that specifically leverages MRI to quantify and subsequently map the mechanical properties of soft tissue. First developed and described at Mayo Clinic by Muthupillai et al. in 1995, MRE has emerged as a powerful, non-invasive diagnostic tool, namely as an alternative to biopsy and serum tests for staging liver fibrosis.
Cardiac amyloidosis is a subcategory of amyloidosis where there is depositing of the protein amyloid in the cardiac muscle and surrounding tissues. Amyloid, a misfolded and insoluble protein, can become a deposit in the heart's atria, valves, or ventricles. These deposits can cause thickening of different sections of the heart, leading to decreased cardiac function. The overall decrease in cardiac function leads to a plethora of symptoms. This multisystem disease was often misdiagnosed, with a corrected analysis only during autopsy. Advancements of technologies have increased earlier accuracy of diagnosis. Cardiac amyloidosis has multiple sub-types including light chain, familial, and senile. One of the most studied types is light chain cardiac amyloidosis. Prognosis depends on the extent of the deposits in the body and the type of amyloidosis. New treatment methods are actively being researched in regards to the treatment of heart failure and specific cardiac amyloidosis problems.
Cardiac magnetic resonance imaging, also known as cardiovascular MRI, is a magnetic resonance imaging (MRI) technology used for non-invasive assessment of the function and structure of the cardiovascular system. Conditions in which it is performed include congenital heart disease, cardiomyopathies and valvular heart disease, diseases of the aorta such as dissection, aneurysm and coarctation, coronary heart disease. It can also be used to look at pulmonary veins. Patient information may be found here.
Cardiac imaging refers to minimally invasive imaging of the heart using ultrasound, magnetic resonance imaging (MRI), computed tomography (CT), or nuclear medicine (NM) imaging with PET or SPECT. These cardiac techniques are otherwise referred to as echocardiography, Cardiac MRI, Cardiac CT, Cardiac PET and Cardiac SPECT including myocardial perfusion imaging.
Elliot R. McVeigh is a professor of bioengineering, Medicine and Radiology at the University of California, San Diego (UCSD). His research utilises low dose CT imaging and MR imaging techniques to identify those people at substantially higher risk for heart attacks.
Philip Caves (1940–1978) was an Irish cardiothoracic surgeon. In 1972, while at Stanford University, he pioneered the use of the bioptome and transvenous endomyocardial biopsy in the early diagnosis of heart transplant rejection. It was considered the most significant advance in antirejection therapy of the time. Awarded the British American Research Fellowship in 1971, Caves worked with pioneering cardiothoracic surgeon Norman Shumway at Stanford and became staff surgeon leading the transplant programme by 1973. A year later he went to Edinburgh as a senior lecturer in cardiac surgery, where he became particularly interested in pediatric cardiac surgery.
An MRI sequence in magnetic resonance imaging (MRI) is a particular setting of pulse sequences and pulsed field gradients, resulting in a particular image appearance.
Margaret E. Billingham was a pathologist at Stanford University Medical Center, who made significant achievements in the early recognition and grading of transplant rejection following cardiac transplantation, known as 'Billingham's Criteria'. She also described chronic rejection and techniques in heart endomyocardial biopsy.
Endomyocardial biopsy (EMB) is an invasive procedure used routinely to obtain small samples of heart muscle, primarily for detecting rejection of a donor heart following heart transplantation. It is also used as a diagnostic tool in some heart diseases.
Rohin Francis is a British cardiologist, writer, comedian, and creator of the YouTube channel Medlife Crisis. He is working toward a PhD on imaging techniques for acute myocardial infarction. Throughout the COVID-19 pandemic, Francis has created content that has looked to educate the public about medicine.
References
- 1 2 Baim, Donald S. (2006). "20. Endomyocardial biopsy". Grossman's Cardiac Catheterization, Angiography, and Intervention. Lippincott Williams & Wilkins. p. 396. ISBN 9780781755672.
- ↑ Unterberg-Buchwald, Christina; Ritter, Christian Oliver; Reupke, Verena; Wilke, Robin Niklas; Stadelmann, Christine; Steinmetz, Michael; Schuster, Andreas; Hasenfuß, Gerd; Lotz, Joachim; Uecker, Martin (19 April 2017). "Targeted endomyocardial biopsy guided by real-time cardiovascular magnetic resonance". Journal of Cardiovascular Magnetic Resonance. 19 (1): 45. doi: 10.1186/s12968-017-0357-3 . ISSN 1097-6647. PMC 5395773 . PMID 28424090.
- ↑ Asher, Alex (July 2017). "A review of endomyocardial biopsy and current practice in England: out of date or underutilised?". The British Journal of Cardiology. Retrieved 29 September 2018.
- ↑ Melvin, Kenneth R.; Mason, Jay W. (15 June 1982). "Endomyocardial biopsy: its history, techniques and current indications". Canadian Medical Association Journal. 126 (12): 1381–1386. ISSN 0008-4409. PMC 1863164 . PMID 7044509.
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