Dr. Ben Wedro practices emergency medicine at Gundersen Clinic, a regional trauma center in La Crosse, Wisconsin. His background includes undergraduate and medical studies at the University of Alberta, a Family Practice internship at Queen's University in Kingston, Ontario and residency training in Emergency Medicine at the University of Oklahoma Health Sciences Center.
Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.
Potassium affects the way neuromuscular cells discharge energy (depolarize)
and then regenerate (repolarize) that energy to be able to fire again. When
potassium levels are low, the cells cannot repolarize and are unable to fire
repeatedly, as is needed for the function of muscles and nerves. It is
understandable then that the effects of low potassium include:
Since the heart is also a muscle, there can be some
changes in the electrocardiogram (EKG or ECG) that are associated with
hypokalemia, especially in the repolarization section of the EKG tracing.
Palpitations (irregular heartbeats) may be perceived by the patient. In severe
cases, hypokalemia can lead to dangerous
disturbances in heart rhythm
(arrhythmias).
How is low potassium diagnosed?
Hypokalemia is usually a secondary problem that is considered by the healthcare
provider as part of the evaluation of the underlying disease. For example,
patients with high blood pressure who are being treated with diuretics such as
hydrochlorothiazide (Hydrodiuril) or
furosemide (Lasix) often have their potassium levels monitored.
Patients who present with vomiting and diarrhea, dehydration and weakness may
have their electrolytes tested in order to determine whether body potassium
losses may need to be replaced.
Blood tests and electrocardiograms are used to diagnose hypokalemia. Other
testing may be done to define the underlying disease or illness that lead to the
low potassium levels.
Muscle cramps are involuntarily and forcibly contracted muscles that do not relax. Extremely common, any muscles that have voluntary control, including some organs, are subject to cramp. Since there is such variety in the types of muscle cramps that can occur, many causes and preventative medications are known. Stretching is the most common way to stop or prevent most muscle cramps.
Gastroenteritis (viral gastroenteritis, stomach flu) is an infection caused by a variety of viruses that results in vomiting and/or diarrhea. Even though it is often called the "stomach flu," it is not caused by the influenza viruses. Viruses that can cause gastroenteritis (stomach flu) include: rotaviruses, adenoviruses, caliciviruses, astroviruses, Norwalk virus, and a group of Noroviruses. Gastroenteritis is not caused by bacteria. The main symptoms of gastroenteritis include vomiting and watery diarrhea, however, headache, fever, and abdominal cramps (stomach ache) may also be present.
Diarrhea is a change is the frequency and looseness of bowel movements. Cramping, abdominal pain, and the sensation of rectal urgency are all symptoms of diarrhea. Absorbents and anti-motility medications are used to treat diarrhea.
Dehydration is the excessive loss of body water. There are a number of causes of dehydration including heat exposure, prolonged vigorous exercise, and some diseases of the gastrointestinal tract. The best way to treat dehydration is to prevent it from occurring.
Nausea is an uneasiness of the stomach that often precedes vomiting. Nausea and vomiting are not diseases, but they are symptoms of many conditions. The causes of vomiting differ according to age, and treatment depends upon the cause of nausea and vomiting.
Palpitations are unpleasant sensations of irregular and/or forceful beating of the heart. Palpitations can be relieved in many patients by stress reduction, stopping cigarettes, and reduction of caffeine and alcohol.
Hyperkalemia is an abnormally high level of potassium in the blood. Symptoms of hyperkalemia include nausea, fatigue, tingling sensations, or muscle weakness. Hyperkalemia may also cause no symptoms. Slow heartbeat and weak pulse are more serious symptoms. Causes of hyperkalemia include kidney dysfunction, medications, adrenal gland diseases, and potassium shifts. Treatment of hyperkalemia is dependant upon the cause.
Premature ventricular contractions (PVCs) are premature heartbeats originating from the ventricles of the heart. PVCs are premature because they occur before the regular heartbeat. There are many causes of premature ventricular contractions to include: heart attack, high blood pressure, congestive heart failure, mitral valve prolapse, hypokalemia, hypoxia, medications, excess caffeine, drug abuse, and myocarditis.
Heart rhythm disorders vary from minor palpitations, premature atrial contractions (PACs), premature ventricular contractions (PVCs), sinus tachycardia, and sinus brachycardia, to abnormal heart rhythms such as tachycardia, ventricular fibrillation, ventricular flutter, atrial fibrillation, atrial flutter, paroxysmal supraventricular tachycardia (PSVT), Wolf-White-Parkinson syndrome, brachycardia, or heart blocks. Treatment is dependant upon the type of heart rhythm disorder.
Myofascial pain syndrome is muscle pain in the body's soft tissues due to injury or strain. Symptoms include muscle pain with tender points and fatigue. Treatment usually involves physical therapy, massage therapy, or trigger point injection.
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