Common Cardiac Arrhythmias and Their Characteristics

Acute atrial fibrillation is characterized by a sudden onset within the past 48 hours and may be triggered by excessive alcohol or caffeine intake. An ECG is necessary for diagnosis. Atrial flutter is less common than atrial fibrillation and typically presents with a rapid, irregular or regular pulse with a ventricular rate of approximately 150 beats per minute. Extrasystoles are extra heartbeats that disrupt the normal rhythm of the heart and can originate from either the atria or ventricles. Sinus arrhythmia is a common occurrence in children and young adults and involves cyclic changes in heart rate during breathing. Sinus tachycardia is a physiological response to various stimuli such as fever, anxiety, pain, exercise, and hyperthyroidism, and is characterized by a regular heart rate of over 100 beats per minute.

Understanding Hypertension: Prevalence, Types, and Treatment

Hypertension, or high blood pressure, is a common condition that affects both men and women, with its prevalence increasing with age. Essential hypertension, which has no identifiable cause, is the most common type of hypertension, affecting 95% of hypertensive patients. However, indications for further evaluation include resistant hypertension and early, late, or rapid onset of high blood pressure.

Reducing blood pressure by an average of 12/6 mm Hg can significantly reduce the risk of stroke and coronary heart disease. Salt restriction, alcohol reduction, smoking cessation, aerobic exercise, and weight loss can also help reduce blood pressure by 3-5 mmHg, comparable to some drug treatments.

In severe cases, hypertension can lead to target organ damage, resulting in a hypertensive emergency. Malignant hypertension, which is diagnosed when papilloedema is present, can cause symptoms such as severe headache, visual disturbance, dyspnoea, chest pain, nausea, and neurological deficit.

Understanding hypertension and its types is crucial in managing and treating this condition. By implementing lifestyle changes and seeking medical attention when necessary, individuals can reduce their risk of hypertension-related complications.

The normal corrected QT interval for males is below 430 ms and for females it is below 450 ms. Long QT syndrome (LQTS) is a rare condition that can be inherited or acquired, causing delayed repolarisation of the ventricles and increasing the risk of ventricular tachyarrhythmias. This can result in syncope, cardiac arrest, or sudden death. LQTS can be detected incidentally on an ECG, after a cardiac event such as syncope or cardiac arrest, or following the sudden death of a family member.

Long QT syndrome (LQTS) is a genetic condition that causes a delay in the ventricles’ repolarization. This delay can lead to ventricular tachycardia/torsade de pointes, which can cause sudden death or collapse. The most common types of LQTS are LQT1 and LQT2, which are caused by defects in the alpha subunit of the slow delayed rectifier potassium channel. A normal corrected QT interval is less than 430 ms in males and 450 ms in females.

There are various causes of a prolonged QT interval, including congenital factors, drugs, and other conditions. Congenital factors include Jervell-Lange-Nielsen syndrome and Romano-Ward syndrome. Drugs that can cause a prolonged QT interval include amiodarone, sotalol, tricyclic antidepressants, and selective serotonin reuptake inhibitors. Other factors that can cause a prolonged QT interval include electrolyte imbalances, acute myocardial infarction, myocarditis, hypothermia, and subarachnoid hemorrhage.

LQTS may be detected on a routine ECG or through family screening. Long QT1 is usually associated with exertional syncope, while Long QT2 is often associated with syncope following emotional stress, exercise, or auditory stimuli. Long QT3 events often occur at night or at rest and can lead to sudden cardiac death.

Management of LQTS involves avoiding drugs that prolong the QT interval and other precipitants if appropriate. Beta-blockers are often used, and implantable cardioverter defibrillators may be necessary in high-risk cases. It is important to note that sotalol may exacerbate LQTS.

The threshold for stage 1 hypertension, as measured by ambulatory blood pressure monitoring (ABPM) or home blood pressure monitoring (HBPM), is a reading of 135/85 mmHg.

Hypertension, or high blood pressure, is a common condition that can lead to serious health problems if left untreated. The National Institute for Health and Care Excellence (NICE) has published updated guidelines for the management of hypertension in 2019. Some of the key changes include lowering the threshold for treating stage 1 hypertension in patients under 80 years old, allowing the use of angiotensin receptor blockers instead of ACE inhibitors, and recommending the use of calcium channel blockers or thiazide-like diuretics in addition to ACE inhibitors or angiotensin receptor blockers.

Lifestyle changes are also important in managing hypertension. Patients should aim for a low salt diet, reduce caffeine intake, stop smoking, drink less alcohol, eat a balanced diet rich in fruits and vegetables, exercise more, and lose weight.

Treatment for hypertension depends on the patient’s blood pressure classification. For stage 1 hypertension with ABPM/HBPM readings of 135/85 mmHg or higher, treatment is recommended for patients under 80 years old with target organ damage, established cardiovascular disease, renal disease, diabetes, or a 10-year cardiovascular risk equivalent to 10% or greater. For stage 2 hypertension with ABPM/HBPM readings of 150/95 mmHg or higher, drug treatment is recommended regardless of age.

The first-line treatment for patients under 55 years old or with a background of type 2 diabetes mellitus is an ACE inhibitor or angiotensin receptor blocker. Calcium channel blockers are recommended for patients over 55 years old or of black African or African-Caribbean origin. If a patient is already taking an ACE inhibitor or angiotensin receptor blocker, a calcium channel blocker or thiazide-like diuretic can be added.

If blood pressure remains uncontrolled with the optimal or maximum tolerated doses of four drugs, NICE recommends seeking expert advice or adding a fourth drug. Blood pressure targets vary depending on age, with a target of 140/90 mmHg for patients under 80 years old and 150/90 mmHg for patients over 80 years old. Direct renin inhibitors, such as Aliskiren, may be used in patients who are intolerant of other antihypertensive drugs, but their role is currently limited.

NYHA Classification for Chronic Heart Failure

Chronic heart failure is a condition that affects the heart’s ability to pump blood effectively. The New York Heart Association (NYHA) classification is a widely used system to categorize the severity of heart failure. The NYHA classification has four classes, each with a different level of symptoms and limitations.

NYHA Class I refers to patients who have no symptoms and no limitations in their physical activity. They can perform ordinary physical exercise without experiencing fatigue, dyspnea, or palpitations.

NYHA Class II patients have mild symptoms and slight limitations in their physical activity. They are comfortable at rest, but ordinary activity can cause fatigue, palpitations, or dyspnea.

NYHA Class III patients have moderate symptoms and marked limitations in their physical activity. They are comfortable at rest, but less than ordinary activity can result in symptoms.

NYHA Class IV patients have severe symptoms and are unable to carry out any physical activity without discomfort. Symptoms of heart failure are present even at rest, and any physical activity increases discomfort.

In summary, the NYHA classification is a useful tool for healthcare professionals to assess the severity of chronic heart failure and determine appropriate treatment plans.

Treatment Options for Chronic Heart Failure

Chronic heart failure is a serious condition that requires proper management to improve patient outcomes. One of the recommended treatment options is the prescription of a cardioselective β-blocker such as carvedilol. However, it should not be taken at the same time as an ACE inhibitor. While diuretics can help control oedema, the mainstay of treatment for chronic heart failure is ACE inhibitors and β-blockade. Although digoxin and spironolactone may have a place in treatment, they are not first or second line options. For severe cases of heart failure, biventricular pacing with an implantable defibrillator can be useful. Overall, a combination of these treatment options can help manage chronic heart failure and improve patient outcomes.

Bicuspid Aortic Valve: Risks and Recommendations

Bicuspid aortic valve is a common congenital heart disease in adults, occurring in 1-2% of the population with a familial incidence of around 10%. While some patients may be asymptomatic, about 30% develop complications such as aortic stenosis or insufficiency, which may require surgery. Additionally, the aorta of patients with bicuspid aortic valve has reduced tensile strength, putting them at higher risk for aortic dissection and aneurysm formation in the ascending aorta.

To manage the cardiovascular risk associated with this condition, low-dose aspirin and cholesterol-lowering drugs may be prescribed as appropriate. While there is evidence supporting a familial predisposition, screening for family members is not yet universally recommended. Finally, while infective endocarditis is a potential complication, antibiotic prophylaxis during dental procedures is no longer recommended.

In summary, bicuspid aortic valve requires careful monitoring and management to prevent complications and ensure optimal cardiovascular health.

Treatment Options for Raynaud’s Phenomenon

Raynaud’s phenomenon is a condition that causes the blood vessels in the fingers and toes to narrow, leading to reduced blood flow and pain. The most commonly used drug for treatment is nifedipine, which causes vasodilatation and reduces the number and severity of attacks. However, patients may experience side-effects such as hypotension, flushing, headache, and tachycardia.

For those who cannot tolerate nifedipine, other agents such as nicardipine, amlodipine, or diltiazem can be tried. Limited evidence suggests that angiotensin receptor-blockers, fluoxetine, and topical nitrates may also provide some benefit. However, there is no evidence to support the use of antiplatelet agents.

In secondary Raynaud’s phenomenon, management of the underlying cause may help alleviate symptoms. Treatment options are similar to primary Raynaud’s phenomenon, with the addition of the prostacyclin analogue iloprost, which has shown to be effective in systemic sclerosis.

Overall, treatment options for Raynaud’s phenomenon aim to improve blood flow and reduce the frequency and severity of attacks. It is important to work with a healthcare provider to find the most effective treatment plan for each individual.

If a patient experiences abdominal pain, it is likely that they have a symptomatic AAA which poses a high risk of rupture. In such cases, surgical intervention, specifically endovascular repair (EVAR), is necessary rather than relying on medical treatment or observation. The abdominal aortic diameter must be greater than 5.5cm to be classified as high rupture risk, which is a close call. The presence of trace free fluid is generally considered normal. Conservative measures, such as quitting smoking, should be taken to address cardiovascular risk factors. An AAA’s velocity of growth should be monitored, and a high-risk AAA would only be indicated if there is an increase of more than 1 cm per year. Ultimately, the decision to proceed with elective surgery is a complex one that should be made in consultation with the patient and surgeon.

Abdominal aortic aneurysm (AAA) is a condition that often develops without any symptoms. However, a ruptured AAA can be fatal, so it is important to screen patients for this condition. Screening involves a single abdominal ultrasound for males aged 65. The results of the screening are interpreted based on the width of the aorta. If the width is less than 3 cm, no further action is needed. If the width is between 3-4.4 cm, the patient should be rescanned every 12 months. If the width is between 4.5-5.4 cm, the patient should be rescanned every 3 months. If the width is 5.5 cm or greater, the patient should be referred to vascular surgery within 2 weeks for probable intervention.

For patients with a low risk of rupture (asymptomatic, aortic diameter < 5.5cm), abdominal ultrasound surveillance should be conducted on the time-scales outlined above. Additionally, cardiovascular risk factors should be optimized, such as quitting smoking. For patients with a high risk of rupture (symptomatic, aortic diameter >=5.5cm or rapidly enlarging), referral to vascular surgery for probable intervention should occur within 2 weeks. Treatment options include elective endovascular repair (EVAR) or open repair if unsuitable. EVAR involves placing a stent into the abdominal aorta via the femoral artery to prevent blood from collecting in the aneurysm. However, a complication of EVAR is an endo-leak, where the stent fails to exclude blood from the aneurysm, and usually presents without symptoms on routine follow-up.

Antithrombotic therapy for prosthetic heart valves differs depending on the type of valve. Bioprosthetic valves typically only require aspirin, while mechanical valves require both warfarin and aspirin. However, according to the 2017 European Society of Cardiology guidelines, aspirin is only given in addition if there is another indication, such as ischaemic heart disease. Direct acting oral anticoagulants are not used for patients with a mechanical heart valve.

Prosthetic Heart Valves: Options and Considerations

Prosthetic heart valves are commonly used to replace damaged or diseased valves in the heart. The two main options for replacement are biological (bioprosthetic) or mechanical valves. Bioprosthetic valves are usually derived from bovine or porcine sources and are preferred for older patients. However, they have a major disadvantage of structural deterioration and calcification over time. On the other hand, mechanical valves have a low failure rate but require long-term anticoagulation due to the increased risk of thrombosis. Warfarin is still the preferred anticoagulant for patients with mechanical heart valves, and the target INR varies depending on the valve location. Aspirin is only given in addition if there is an additional indication, such as ischaemic heart disease.

It is important to consider the patient’s age, medical history, and lifestyle when choosing a prosthetic heart valve. While bioprosthetic valves may not require long-term anticoagulation, they may need to be replaced sooner than mechanical valves. Mechanical valves, on the other hand, may require lifelong anticoagulation, which can be challenging for some patients. Additionally, following the 2008 NICE guidelines, antibiotics are no longer recommended for common procedures such as dental work for prophylaxis of endocarditis. Therefore, it is crucial to weigh the benefits and risks of each option and make an informed decision with the patient.