Atrial Fibrillation

Abstract: Although excessive daytime sleepiness is most often simply the result of inadequate sleep, other causes must be considered as well. Common causes of daytime sleepiness include obstructive sleep apnea/hypopnea syndrome (OSAHS) and medication side effects. The differential diagnosis also includes narcolepsy and restless legs syndrome (RLS). In many cases, the answers to a few simple questions can provide the necessary clues to the diagnosis. Loud snoring is associated with OSAHS, while sudden muscle weakness triggered by intense emotion is consistent with narcolepsy. Referral for sleep evaluation is indicated to evaluate for OSAHS, narcolepsy, RLS, and idiopathic hypersomnia. Methods of measuring daytime sleepiness include the Multiple Sleep Latency Test and the Epworth Sleepiness Scale. (J Respir Dis. 2005;26(6):253-259)

Congestive heart failure (CHF) was recently diagnosed in a 71-year-old woman whose ejection fraction was 30%. The following CHF regimen was prescribed: metoprolol, 25 mg/d; digoxin, 0.25 mg/d; hydrochlorothiazide, 50 mg/d; enalapril, 5 mg/d; and spironolactone, 25 mg/d. A low-salt diet was also recommended.

ABSTRACT: Syncope is often benign and self-limited; however, it may sometimes indicate a life-threatening condition. Advanced age, heart disease, and abnormal ECG findings are associated with potentially adverse outcomes. The initial evaluation, which consists of a careful history taking, physical examination, and ECG, often suffices to make the diagnosis. Neurally mediated disorders, the most common cause of syncope, are usually benign. Cardiac syncope, which usually requires admission and further assessment, may result from rhythm disturbances or from outflow obstruction attributable to structural or pathophysiologic mechanisms. Patients with cardiac syncope may be evaluated with echocardiography, Holter monitoring, stress testing, loop event recorders, or electrophysiologic studies. Other causes of syncope include orthostatic hypotension, use of certain medications, a primary neurologic disorder, and psychiatric disturbance. A significant number of patients have unexplained syncope.

A 34-year-old man presents to the emergency department with progressive, generalized weakness and shortness of breath that began 2 weeks earlier. He has no history of cardiac disorders, and he denies chest pain, palpitations, and abdominal pain. He admits to recent methamphetamine use.

The parents of this 2-year-old boy brought their son for evaluation of swelling of the right leg and excoriation and serosanguineous discharge from the ankle region of 3 days' duration.The child had had a hemangioma of the right ankle since birth. Subsequently, there was gradual spread of the lesion along the leg to the buttocks.

Abstract: In most patients, a life-threatening exacerbation of asthma is preceded by a gradual worsening of symptoms. However, some patients have a sudden onset of worsening symptoms, and these patients are at increased risk for respiratory failure and death. Risk factors for near-fatal asthma include a history of a life-threatening exacerbation, hospitalization for asthma within the past year, delay in time to evaluation after the onset of symptoms, and a history of psychosocial problems. Regularly monitoring peak expiratory flow rate (PEFR) is particularly important because it can identify a subset of high-risk patients--specifically, those with large fluctuations in PEFR and those who have severe obstruction but minimal symptoms. Signs of life-threatening asthma include inability to lie supine, difficulty in speaking in full sentences, diaphoresis, sternocleidomastoid muscle retraction, tachycardia, and tachypnea. (J Respir Dis. 2005;26(5):201-207)

A 68-year-old man presents to the emergency department with diplopia and headache of acute onset accompanied by nausea and vomiting.

An 80-year-old man complains of lancinating pain in his right axilla and chest that began 2 days earlier and has kept him awake at night. He has had no fever, cough, sputum production, dyspnea, or symptoms suggestive of congestive heart failure.

Abstract: Bridging anticoagulant therapy is used to minimize the risk of thromboembolic complications when warfarin therapy must be temporarily interrupted because of surgery or another procedure. The decision to use this strategy depends on the patient's risk of thromboembolic complications and the risk of bleeding associated with the specific procedure. One approach is to withhold 4 or 5 daily doses of warfarin before surgery and initiate low molecular weight heparin (LMWH) 3 or 4 days before surgery. The last dose of LMWH is administered at least 24 hours before the procedure. After the procedure, prophylactic-dose LMWH can be administered subcutaneously once daily. The use of therapeutic-dose LMWH should be deferred until at least 24 or 48 hours after procedures that have a low or moderate risk of bleeding and until 48 or 72 hours after high-risk procedures. (J Respir Dis. 2005;26(4):170-172)

What steps can older patients take now to improve their health and quality of life and maintain their independence?

Cardiovascular disease is the chief cause of death among women. Nevertheless, in a recent survey of women, only 13% responded that their own greatest health threat was heart disease.

A 69-year-old woman was hospitalized with fever, chills, and nausea. Three weeks earlier, she had received a 2-week course of oral levofloxacin for pneumonia, which resolved. Her history included rheumatic heart disease; diabetes mellitus; depression; a hysterectomy; 2 mitral commissurotomies; nonrepairable mitral valve regurgitation, for which she received a St Jude Medical bileaflet valve; a left-sided cerebrovascular accident; and paroxysmal atrial fibrillation. Her medications included verapamil, furosemide, metoprolol, potassium chloride, metformin, nortriptyline, and warfarin. She denied tobacco and alcohol use.

ABSTRACT: Education can help improve compliance with inhaled corticosteroid therapy or correct faulty metered-dose inhaler (MDI) technique. Options for patients with poor MDI technique include use of a spacer or an alternative device, such as a nebulizer or a dry powder inhaler. If therapy is ineffective, consider alternative conditions that mimic asthma, especially vocal cord dysfunction and upper airway obstruction. Treatment of comorbid conditions, such as gastroesophageal reflux disease or rhinosinusitis, may improve control. In refractory asthma, it is crucial to identify allergic triggers and reduce exposure to allergens. If another medication needs to be added to the inhaled corticosteroid, consider a long- acting b-agonist, leukotriene modifier, or the recombinant monoclonal anti-IgE antibody omalizumab.

A 23-year-old man presents to theemergency department (ED) withacute chest discomfort, which startedin the morning. He describes the discomfortas more akin to palpitationsthan to actual pain. The discomfortis midsternal, nonradiating, nonpleuritic,and associated with dyspnea; itis neither exertional nor positional.There is no viral prodrome.

A 47-year-old man presented to theemergency department with adrooping right eye. He also complainedof a constant right-sidedheadache of 1 week’s duration; thepain involved the temporal region.Another physician had diagnosednew-onset migraine and prescribedsumatriptan, which failed to alleviatethe pain. The patient had no weakness,vomiting, or double vision.Both his father and his son hadMarfan syndrome.

A 72-year-old woman first noticed progressive enlargement of the maxillary area of her face 18 years earlier. She denied facial trauma and significant dental caries. Her medical history consisted of breast cancer managed by a mastectomy and type 2 diabetes mellitus of 3 years’ duration.

ABSTRACT: High-sensitivity C-reactive protein (hs-CRP), a marker of low-grade vascular inflammation, reflects baseline inflammatory predilection-a key factor in the genesis and rupture of atheromatous plaque. Measurement of hs-CRP is recommended in persons who have an intermediate (10% to 20%) 10-year risk of coronary artery disease; a level above 3 mg/dL indicates higher cardiovascular risk. Although dietary therapy and statins may lower hs-CRP levels, such reductions have not been shown to prevent cardiovascular events or death. Elevated homocysteine levels have been associated with an increased risk of cardiovascular disease. Consider screening in patients with a personal or family history of cardiovascular disease who do not have well- established risk factors. Supplementation with folic acid and vitamin B12 reduces homocysteine levels by about 30%. Elevated fibrinogen levels have been associated with ischemic heart disease and stroke; however, fibrinogen-lowering therapy has not led to better outcomes than standard treatment regimens.

ABSTRACT: The early signs of diabetic neuropathy can be detected during a routine clinical examination. Inspect patients' feet for deformities and sensory loss, which indicate risk of ulceration. Prolonged poor glycemic control, alcohol abuse, and obesity increase the risk of amputation. Autonomic dysfunction, which can lead to sexual dysfunction and gastropathy, can be detected by measurement of heart rate and blood pressure. A resting heart rate of about 100 beats per minute and a decrease of about 30 mm Hg in systolic blood pressure within 2 minutes of standing are abnormal findings. Electromyography and nerve conduction studies confirm the diagnosis. Improved metabolic control is the main goal of treatment. Analgesics, neuromodulators, and tricyclic antidepressants are effective for managing pain. In patients with autonomic neuropathy, treat the associated symptoms.

A left-handed 84-year-old retired attorney is seen for a routine scheduled visit 5 months after a stroke. The nondominant hemisphere was affected by an embolism that arose in the newly fibrillating left atrium.

ABSTRACT: The Studies of Left Ventricular Dysfunction (SOLVD) trials demonstrated that early intervention in congestive heart failure (CHF) improves survival. However, early CHF is mainly a clinical diagnosis based on New York Heart Association criteria and, until recently, no easy and inexpensive screening test existed. There are now several such tests that employ radioimmunoassays (RIAs) to measure cardiac peptides in a single plasma sample; results help determine the likelihood that CHF is present but do not definitively establish the diagnosis. The vessel dilator RIA is the most specific and sensitive for differentiating persons with mild CHF from healthy ones; intravenous administration of this cardiac peptide hormone has beneficial hemodynamic, diuretic, and natriuretic properties in persons who have CHF. Brain natriuretic peptide (BNP) measured by fluorescence immunoassay is useful in the emergency department, because a result may be obtained in as little as 15 minutes. This assay may indicate CHF; further tests are recommended to define the diagnosis. BNP increases with other causes of dyspnea, including pulmonary hypertension, pulmonary emboli, and renal failure, so it is not specific for CHF. BNP also increases with age, and measured values are higher in women than in men.

A 60-year-old woman with hypertension, diabetes mellitus, and intermittentatrial fibrillation presents with nausea, diaphoresis, dizziness, and globalweakness that has lasted 1 hour. She denies chest pain, dyspnea, syncope,vomiting, diarrhea, blood loss, and headache; there is no vertigo. Medicationsinclude acetaminophen, digoxin, diltiazem, glipizide, hydrochlorothiazide,irbesartan, metformin, pioglitazone, and warfarin.

ABSTRACT: The cause of edema can usually be determined by judicious use of clues from the history, physical examination, and laboratory results. Localized edema can be the result of deep venous thrombosis, venous stasis, cellulitis, vascular insufficiency, or diuretic abuse; it can also be idiopathic. Clues that are helpful in distinguishing among these conditions include tenderness, positive Homans sign, hair loss on the legs, nonpalpable pulses, and a history of lower extremity injury. Edema of the lower extremities that is accompanied by massive ascites is typical of cirrhosis. Edema of the lower extremities unaccompanied by ascites can be associated with inferior vena cava or iliac venous thrombosis or with vasodilator therapy. Generalized edema can result from congestive heart failure (strong clues are dyspnea on exertion and paroxysmal nocturnal dyspnea), renal disease (a common clue is edema of the face and eyes), or preeclampsia. The basic studies to order in patients with generalized edema are a urinalysis, complete blood cell count, serum chemistry panel with total protein and albumin levels, and a 24-hour urine collection, which is especially helpful in distinguishing among the various types of renal disease.

ABSTRACT: Restriction of fluid and salt intake is essential in patients with edema. Bed rest and supportive stockings are also helpful. However, diuretics are usually the mainstay of therapy. The effect of thiazide diuretics is relatively mild; they may be adequate in patients with cirrhosis but are ineffective in those with congestive heart failure (CHF) or nephrotic syndrome. Loop-acting diuretics can induce massive natriuresis and diuresis. Intravenous loop diuretics are preferred to oral agents for the relief of pulmonary edema. Acetazolamide, a carbonic anhydrase inhibitor, is commonly used in patients with glaucoma and is also recommended for those with CHF accompanied by metabolic alkalosis. Combination therapy is recommended for patients with refractory edema and normal or somewhat impaired renal function. The adverse effects of thiazide and loop-acting diuretics include renal insufficiency, hyponatremia, hypochloremia, hypokalemia, hypomagnesemia, metabolic alkalosis, hyperglycemia, and hyperlipidemia. These effects are typically reversed when the dosage is reduced or therapy is discontinued. Potassium sparing diuretics can cause life-threatening hyperkalemia.

A 32-year-old woman presents with weight loss of 6.4 kg (14 lb) during the past 8 months and diarrhea of recentonset. Menstruation had ceased 10 weeks earlier. She appears anxious, with pressured speech. Physical examination detectsbaseline sinus tachycardia, sweaty palms, and a diffusely enlarged thyroid gland. Laboratory tests reveal a thyroid-stimulatinghormone (TSH) level of 0.00 µU/mL (normal, 0.45 to 4.5 µU/mL), a free thyroxine (FT4) level of 4.8 ng/dL (normal,0.61 to 1.76 ng/dL), and a positive thyroid-stimulating immunoglobulin (TSI) level with high titer.

A 48-year-old woman with a historyof hypertension and mildasthma has been transferred to themedical service because of an abnormalpostoperative ECG. She hadbeen admitted 2 weeks earlier to thegynecology-oncology service for localrecurrence of a previously resecteduterine sarcoma and underwent laparotomyfor debulking of the pelvicmass and resection of the rectosigmoidcolon. She did well until postoperativeday 14, when sudden chestpain and dyspnea developed.