Daniel I Simon MD

Atrial fibrillation - also known as AF or a-fib - is a medical condition that affects the rhythm of the heart. Problems that affect the rhythm of the heart cause a condition known as arrhythmia. This condition often causes irregular blood flow. It is quite common, with more than 200,000 cases in the...

What is muscular dystrophy?Muscular dystrophy is a group of disorders that cause skeletal muscle degeneration, decreased flexibility, and progressive weakness. In muscular dystrophy, the abnormal mutation of genes interferes with the production of proteins, which are needed for healthy muscle...

Heart palpitations, although it feels like a scary experience, are not always a sign of something serious. These palpitations are harmless but there are some instances when it could be a signal to a serious heart disease, especially if it is associated with other symptoms. This article explains...

Atypical myocardial infarction often occurs in older patients with a pronounced cardiosclerosis, circulatory failure, and often with people who have a history of heart attacks.The symptoms may confuse you, or make you think that they are not associated with the heart.Usually, atypical manifestations...

Secondary hypertension refers to high blood pressure that is caused by other diseases. This is a less common form of hypertension when compared to ‘essential’ or ‘primary’ hypertension. A number of conditions that affect heart, kidneys or endocrine system may result in secondary...

Our heart rate is automatically controlled by the autonomic nervous system (ANS) that has two divisions: sympathetic and parasympathetic. The part of the ANS that is responsible for raising a person’s heart rate through the sympathetic plexus is the sympathetic division. The parasympathetic...