Arrhythmia knowledge: a qualitative study

OBJECTIVE

The objective is to identify and describe critical care nurses' perception of arrhythmia knowledge. In addition, this study is the first step in developing levels of arrhythmia competency.

DESIGN

A qualitative research design was used. Focus group technique using a semistructured group session, with a moderator, was used to gather data. Data were analyzed by the constant comparative method.

SUBJECTS

The subjects were critical care nurses who work in acute care settings where they read electrocardiographic data and make treatment decisions.

PROCEDURES

Five focus groups were conducted over a period of 12 months. Group size ranged from four to eight participants. Participants were asked to describe their perceptions of arrhythmia knowledge and to assign a rating score related to the level of knowledge needed to identify specific arrhythmias.

RESULTS

Basic, intermediate, and advanced levels of arrhythmia knowledge were identified. This study revealed a deficit in nurses' ability to recognize and identify specific arrhythmias including heart block, aberrant conduction, and tachyarrhythmias. Understanding of lead placement concepts varied greatly among participants.

CONCLUSIONS

The insight and perspective of critical care nurses related to the level of arrhythmia knowledge are needed for the development of competency measures and evidence-based teaching strategies.

Prinzmetal's angina

Prinzmetal's angina, often referred to as "variant" angina, is a temporary increase in coronary vascular tone (vasospasm) causing a marked, but transient reduction in luminal diameter. This coronary vasospastic state is usually focal at a single site and can occur in either a normal or diseased vessel. Patients are predominantly younger women who may not have the classical cardiovascular risk factors (except for cigarette use). PVA has been associated with vasospastic disorders such as Raynaud's phenomenon and migraine headaches. Arrhythmias are common and may be life threatening especially when the effects of vasospasm are seen in those ECG leads that reflect the potential variations of the epicardial surface of the left ventricle. Endothelial dysfunction has been considered as primarily responsible for PVA. The diagnosis is made by observing transient ST-segment elevation during the attack of angina. Since PVA is not a "demand"- induced symptom, but rather a supply (vasospastic) abnormality, exercise treadmill stress testing is of no value in the diagnosis of PVA. The most sensitive and specific test for PVA is the administration of ergonovine intravenously. Fifty micrograms at 5-minute intervals is given until a positive result or a maximum dose of 400 microg has been administered. When positive, the symptoms and associated ST-segment elevation should be present. Nitroglycerin rapidly reverses the effects of ergonovine if refractory spasm occurs. Medical therapy classically employs vasodilator drugs, which include nitrates and calcium channel blockers. The prognosis is good when there is no significant coronary artery stenosis. Treatment of associated coronary atherosclerosis in elderly patients with PVA is advised. When PVA is associated with coronary atherosclerosis, the prognosis is determined by the severity of the underlying disease. beta-Blockers and large doses of aspirin are contraindicated in PVA.

The cocaine-abused heart

Recreational use of cocaine dates back to the Incas in South America 5000 years ago. Cocaine is derived from the leaves of Erythroxylon coca, a shrub native to South America. In the late 1800s, Sigmund Freud popularized the drug in Europe. He used cocaine to treat depression, asthma, cachexia, and for overcoming morphine addiction. Also in this period cocaine rapidly gained acceptance in surgical procedures as a local anesthetic and vasoconstrictor. Cocaine reached the United States in the early 1900s, and its popularity led President Taft to declare it public enemy number one in 1910. Cocaine became popular again in the 1980s. Currently cocaine use is responsible for more ED visits then any of the other illicit drugs. Because most cocaine users are young, they are at a lower risk for coronary artery atherosclerotic disease. An estimated 25 million people between the ages of 26 and 34 years have used cocaine at least once, 20% were women and 30% men. Habitual users of cocaine are estimated to number 1.5 million. Most cocaine-induced chest pains do not progress to MI, and in fact many originate in the chest wall. The chest pains due to cocaine, however, are induced by myocardial ischemia, a result of vasospasm and not a thrombotic occlusion of a coronary artery that has a ruptured atheromatous plaque. ECG findings can be misleading in the diagnosis because the early repolarization syndrome, a normal variant, is a frequent finding in young African American men. Measurement of cardiac troponin levels is the most reliable diagnostic test. Percutaneous coronary intervention and angioplasty, rather than thrombolysis, is the treatment of choice because intense coronary vasospasm is the primary pathophysiology in cocaine-induced MI.

Obesity and the metabolic syndrome

The prevalence of marked obesity is increasing rapidly among adults and has more than doubled in 10 years. Sixty-one percent of the adult population of the United States is overweight or obese. Americans are the fattest people on earth. Paradoxically these increases in the numbers of persons who are obese or overweight have occurred during recent years when Americans have been preoccupied with numerous dietary programs, diet products, weight control, health clubs, home exercise equipment, and physical fitness videos, each "guaranteed" to bring rapid results. Overweight and obesity are also world problems. The World Health Organization estimates that 1 billion people around the world are now overweight or obese. Westernization of diets has been part of the problem. Fruits, vegetables, and whole grains are being replaced by readily accessible foods high in saturated fat, sugar, and refined carbohydrates. Since class 3 obesity (morbid or extreme obesity) is associated with the most severe health complications, the incidence of hypertension, stroke, heart disease, diabetes, and peripheral vascular disease will increase substantially in the future. Recently, obesity alone has been implicated in the development of cardiac hypertrophy and CHF. The metabolic syndrome associated with abdominal obesity, which includes insulin resistance, dyslipidemia, and elevated CRP levels, identifies subjects who have an increase in cardiovascular morbidity and mortality. Twenty to 25% of the adult population in the United States have the metabolic syndrome, and in some older groups this prevalence approaches 50%. The prevalence of overweight children in the United States has also been increasing dramatically, especially among non-Hispanic blacks and Mexican-American adolescents. Overweight children usually become overweight adults. Atherosclerosis begins in childhood. The degree of atherosclerotic changes in children and young adults can be correlated with the presence of the same risk factors seen in adults. As health providers, our direction is obvious!

Retirement is no excuse for physical inactivity or isolation

At all age levels and especially in the elderly population, a sedentary lifestyle and low fitness levels are independent risk factors for all causes of mortality, including cardiovascular mortality. Exercise improves cardiovascular outcomes by increasing vagal activity and attenuating sympathetic hyperactivity. The risk of diabetes mellitus type 2 developing is reduced by 40% in men of normal weight and 60% in overweight men when on a regular exercise program. Physical activity in the elderly sustains cerebral perfusion, maintaining cognitive function. Isolation, which is not uncommon among the elderly, fosters cognitive decline. Stimulating mental activity can protect against dementia.

Herbal or complementary medicine: fact or fiction?

Although herbal medications have been used in medical therapy since the dawn of civilization, they have not undergone careful scientific assessment. Some herbal derivations are exceptional and have become standard therapy in cardiovascular disease; eg, digitalis, reserpine, and aspirin. The high prevalence of herbal use around the world and in the United States today may have a negative impact on patient care when herbal preparations are used in combination with medications ordered by healthcare providers who are not advised of the patient's use of herbs. Healthcare providers need to be familiar with all herbal medications in order to prevent potentially serious reactions between conventional and herbal medications. They should be asking patients about herbal use when first obtaining a medical history. Patients who use alternative therapies do not tell their healthcare providers about such use.

Herbal or complementary medicine: fact or fiction?

Although herbal medications have been used in medical therapy since the dawn of civilization, they have not undergone careful scientific assessment. Some herbal derivations are exceptional and have become standard therapy in cardiovascular disease; eg, digitalis, reserpine, and aspirin. The high prevalence of herbal use around the world and in the United States today may have a negative impact on patient care when herbal preparations are used in combination with medications ordered by healthcare providers who are not advised of the patient's use of herbs. Healthcare providers need to be familiar with all herbal medications in order to prevent potentially serious reactions between conventional and herbal medications. They should be asking patients about herbal use when first obtaining a medical history. Patients who use alternative therapies do not tell their healthcare providers about such use.

Gender differences in acute coronary events

The most frequent cause of death among women in the United States is coronary heart disease, which claims 200,000 lives a year. The prognosis with either medical or surgical therapy is worse in females than in males. The following significant gender differences have been observed and reported: (1) the rate of early death following acute myocardial infarction is greater in women, (2) the difference between sexes remains whether or not thrombolytic therapy is used, and (3) the hospital mortality rate following coronary angioplasty, atherectomy, or bypass surgery is greater in females. The reasons for these gender differences are not clearly understood. Nevertheless, awareness of the higher morbidity and mortality in women dictates the need for early detection and more aggressive therapy of the risk factors. However, diabetes mellitus and essential hypertension are 2 well-established major risk factors for coronary disease and stroke that are more prevalent in the female gender. These 2 risk factors are cumulative and require more intensive and aggressive therapy to prevent acute vascular events, and therefore early detection is mandatory.

Gender differences in acute coronary events

The most frequent cause of death among women in the United States is coronary heart disease, which claims 200,000 lives a year. The prognosis with either medical or surgical therapy is worse in females than in males. The following significant gender differences have been observed and reported: (1) the rate of early death following acute myocardial infarction is greater in women, (2) the difference between sexes remains whether or not thrombolytic therapy is used, and (3) the hospital mortality rate following coronary angioplasty, atherectomy, or bypass surgery is greater in females. The reasons for these gender differences are not clearly understood. Nevertheless, awareness of the higher morbidity and mortality in women dictates the need for early detection and more aggressive therapy of the risk factors. However, diabetes mellitus and essential hypertension are 2 well-established major risk factors for coronary disease and stroke that are more prevalent in the female gender. These 2 risk factors are cumulative and require more intensive and aggressive therapy to prevent acute vascular events, and therefore early detection is mandatory.

Coronary artery disease--ignored in women or inherently more lethal in women?

The leading cause of death in women is cardiovascular disease. The major cardiovascular risk factors have a greater impact on women. The prognosis for women with CAD is worse than for men. Women frequently present with symptoms of heart disease at a much later age and have a greater frequency of atypical chest pain. Noninvasive testing is less reliable in women. Do these facts indicate that CAD is inherently a more lethal disease in women? Or is CAD, as some would suggest, traditionally ignored in women? Stay tuned!

Coronary artery disease--ignored in women or inherently more lethal in women?

The leading cause of death in women is cardiovascular disease. The major cardiovascular risk factors have a greater impact on women. The prognosis for women with CAD is worse than for men. Women frequently present with symptoms of heart disease at a much later age and have a greater frequency of atypical chest pain. Noninvasive testing is less reliable in women. Do these facts indicate that CAD is inherently a more lethal disease in women? Or is CAD, as some would suggest, traditionally ignored in women? Stay tuned!

Smoking: a burden to patient and society

Smoking prevalence had been steadily decreasing in the United States until 1993 when the rate stabilized. In 1993 there were 46 million adult smokers, which represented 25% of adults aged 18 years and older. Between 1983 and 1993, smoking prevalence among white men declined from 34% to 27% and from 41% to 32% in black men. Smoking prevalence among women declined from 30% to 27%. Currently, smoking prevalence is still higher for men than women, 28% and 23% respectively. More than 70% of adults began their daily habit of smoking by the age of 18 years. The frequency of this habit is highest among Native Americans/Native Alaskans (39%) compared with that of other ethnic groups. It is interesting that smoking prevalence is highest among men who are high-school dropouts (42%). Our role as healthcare providers is clear. We must protect our patients and society from the consequences of smoking. But healthcare professionals must first lead by example. Although the frequency of smokers is decreasing in this segment of society, it was still 18% for RNs and 27% for licensed practical nurses in 1991. Among physicians, the frequency of smokers has decreased from 19% in 1976 to 3% in 1991. With respect to effects on human health and the costs of tobacco use, our direction, responsibility, and duty to our patients and society are very clear.

Smoking: a burden to patient and society

Smoking prevalence had been steadily decreasing in the United States until 1993 when the rate stabilized. In 1993 there were 46 million adult smokers, which represented 25% of adults aged 18 years and older. Between 1983 and 1993, smoking prevalence among white men declined from 34% to 27% and from 41% to 32% in black men. Smoking prevalence among women declined from 30% to 27%. Currently, smoking prevalence is still higher for men than women, 28% and 23% respectively. More than 70% of adults began their daily habit of smoking by the age of 18 years. The frequency of this habit is highest among Native Americans/Native Alaskans (39%) compared with that of other ethnic groups. It is interesting that smoking prevalence is highest among men who are high-school dropouts (42%). Our role as healthcare providers is clear. We must protect our patients and society from the consequences of smoking. But healthcare professionals must first lead by example. Although the frequency of smokers is decreasing in this segment of society, it was still 18% for RNs and 27% for licensed practical nurses in 1991. Among physicians, the frequency of smokers has decreased from 19% in 1976 to 3% in 1991. With respect to effects on human health and the costs of tobacco use, our direction, responsibility, and duty to our patients and society are very clear.

Q and non-Q wave myocardial infarctions

Previously, the classification of MI into transmural and subendocardial types has been based on the presence or absence of abnormal Q waves. The pathologic anatomy of necrosis in MI does not necessarily correspond to these ECG criteria. Thus, it is more appropriate to describe myocardial infarcts as Q wave or non-Q wave infarcts. The importance of this classification is underscored by their clinical and pathologic differences and the tendency for more serious prognosis in the non-Q wave infarcts. It should be noted that in Q wave infarcts the volume of necrosis is usually greater than that in non-Q wave infarcts.

Q and non-Q wave myocardial infarctions

Previously, the classification of MI into transmural and subendocardial types has been based on the presence or absence of abnormal Q waves. The pathologic anatomy of necrosis in MI does not necessarily correspond to these ECG criteria. Thus, it is more appropriate to describe myocardial infarcts as Q wave or non-Q wave infarcts. The importance of this classification is underscored by their clinical and pathologic differences and the tendency for more serious prognosis in the non-Q wave infarcts. It should be noted that in Q wave infarcts the volume of necrosis is usually greater than that in non-Q wave infarcts.

Interventional coronary therapy in the elderly

Advancing age is associated with significantly greater mortality and morbidity in the elderly undergoing coronary artery bypass grafting or PTCA. Nevertheless, successful bypass surgery or PTCA in the elderly has significant benefits (i.e., relief of angina or increase in longevity) that exceed that of the United States population matched for age and gender. Continued improvement in skills in cardiac surgery and PTCA correlated significantly with a progressively better prognosis in the young as well as the elderly.

Myocardial infarction in the young adult

CAD in young male adults below the age of 40 years has generally been found to be associated with the usual risk factors associated with CAD. In a lesser number of young adults, MIs may be related to cocaine use. Sympathomimetic effects and increase in myocardial oxygen demand are factors considered responsible for acute MI in cocaine-abusing patients. In young adults who are asymptomatic following an acute MI and who are able to pass treadmill exercise stress tests at levels of Bruce stage 4 have been shown to have normal coronary arteriograms. Thus this subset should not require routine coronary angiograms following an acute MI.