Stroke: People at Risk and its Consequences

"Stroke" is a the common term for an "acute cerebral infarction", which means injury with loss of neurons of the brain tissue. There are 2 main causes for stroke: the obstruction of one of the arteries that feeds blood to the brain and bleeding from blood vessels in the brain. Both situations are very serious and can lead to loss of brain cells, loss of physical or intellectual function and death.

The people who are at risk for stroke are diabetics, people with high blood pressure, smokers, obese and patients with high cholesterol. If someone already has had a stroke he or she has a higher risk to have another one. In addition, for an individual who has coronary artery disease or peripheral artery disease, there is an increased risk of stroke. Atrial fibrillation (AF; an irregular heart beat) increases the chances of stroke, that is the reason why many persons with AF have to take an anticoagulant (blood thinner). Finally, there are genetic conditions that can increase the risk of stroke. Examples of this are sickle cell disease and increased coagulation disorders such as Factor V Leyden.

Stroke can be a devastating condition for the individual and it is definitely a major public health problem¹ due to the immense cost it represents. It accounts for approximately 320 billion dollars every year in healthcare direct and indirect expenditures². The patient has to deal with loss of function, which could be physical  (paralysis of arms, legs and/or face), and intellectual deficits like the loss memory and inability to speak. The recovery from stroke is usually slow and involves the use different levels of rehabilitation services.

References

1. Hankey GJ. StrokeHow Large a Public Health Problem, and How Can the Neurologist Help?. Arch Neurol. 1999;56(6):748-754. 

2. Mozaffarian D, Benjamin EJ, Go AS, et al. Heart Disease and Stroke Statistics-2016 Update: A Report From the American Heart Association. Circulation. 2016;133:e38-e360.

Marco A. Ramos MD

Atrial Fibrillation. Will you Ever Have it?

Atrial Fibrillation is one of the most common arrhythmias of the heart. It is often referred as “irregular heart beat” or “quivering of the heart”¹. It is important because it is related to strokes, heart failure and cognitive decline. Its treatment, in addition to trying to control the arrhythmia, usually involves anticoagulation in order to decrease the risk of stroke.

Even if people are healthy and have few or no cardiovascular risk factors, there is a age-related risk of developing atrial fibrillation. This risk has been measured and it increases progressively with age. In one study, people between 55-59 years old have a 0.7% risk, 60-64 years old 1.7%, 65-69 years old 4.0%, 70-74 years old 6.0%, 75-79 years old, 9.0%, 80-84 years old 13.5% and older than 85 years old 17.8%². The risk seems to be slightly higher in men than in women.

The risk of developing atrial fibrillation increases with the presence of conditions such as hypertension, diabetes mellitus, hyperthyroidism, heart failure, obesity, obstructive sleep apnea, excessive sports practice, chronic inflammatory states, and alcohol abuse³. In addition there are genetic markers that might explain why certain people develop atrial fibrillation at a younger age and why white people are more affected than people from African of Hispanic descent. There are mutations in certain genes that increase the risk and there are genetic variants called single nucleotide polymorphisms (SNP) that are associated with early onset atrial fibrillation.

Like with every condition, there are modifiable risk factors and non-modifiable risk factors (like the genetic ones). If anyone has any of the non-modifiable risk factors, it is better to be on the safer side and make sure that more risk is not added to the already present ones. Also, be in close communication with your personal physician for proper prevention and treatment if needed.

References

1. http://www.heart.org/HEARTORG/Conditions/Arrhythmia/AboutArrhythmia/What-is-Atrial-Fibrillation-AFib-or-AF_UCM_423748_Article.jsp#.V3RKAFeL1M8. Obtained June 20, 2016

2. Jan Heeringa, Deirdre A.M. van der Kuip, Albert Hofman, Jan A. Kors, Gerard van Herpen, Bruno H.Ch. Stricker, Theo Stijnen, Gregory Y.H. Lip3, and Jacqueline C.M. Witteman. European Heart Journal. 2006;27: 949-953

Marco A. Ramos MD