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A urinary tract infection is defined as the presence of invasive bacteria in the urinary system, together with signs of inflammation, such as high temperature and local pain.
Urinary tract infections may be located in the lower urinary tract (bladder and urethra), or the upper urinary system, affecting one or both kidneys. A kidney infection is also known as pyelonephritis.
Infections of the lower urinary tract are characterised by localised pain, which increases when urinating, and sometimes by cloudy or dark urine, usually without high temperatures.
Kidney infections (pyelonephritis) are characterised by high temperatures, acute local pain in the lower back, and pain or irritation when urinating.
Urinary tract infection is characterised by the presence of local pain (lower abdomen or lumbar region), which increases when urinating. The urine is often cloudy, or dark if it contains blood. There may be high fever, especially in the case of pyelonephritis (an infection of the upper urinary tract).
It can affect people at any age, from early childhood to old age. It is more frequent among women and there are factors that make people vulnerable to it (pregnancy for women and enlarged prostate for men) as well as urological anomalies (pre-existing malformation or presence of kidney stones).
Urinary infections are diagnosed by examining urine under the microscope (sediment) to see whether it contains white blood cells and/or bacteria, and by cultivating the bacteria in a microbiological culture to identify the strain and determine the most appropriate antibiotic for treatment (antibiotic susceptibility testing).
Urinary tract infections are usually treated with antibiotics. Treatment is oral in the case of lower-tract infection.
For upper-tract infections (pyelonephritis) it is usually intravenous, although in some cases outpatient oral treatment may be administered.
The standard tests are urine sediment and culture (urine culture with antibiotic susceptibility testing). An ultrasound scan may be indicated for examining the kidney and urinary tract and identifying obstructions or kidney stones that may have brought about the infection.
Ultrasounds are also used to assess the state of the kidneys. A general analysis may also be indicated to see how the urinary tract infection is affecting the rest of the body, and specifically the renal function.
Urinary tract infection can be prevented by frequent urination (every 2 to 3 hours) and, above all, by avoiding the habit of holding in urine, and by going to the toilet whenever the bladder feels full, without waiting too long.
Infective endocarditis is the presence of a microbial infection on the endocardial surface (the inner surface of the heart). It is the most common cardiovascular infection and is highly significant due to its potential severity and the fact that it can present in different clinical forms.
Infective endocarditis primarily affects the heart valves, whether natural or artificial, although it can sometimes involve other structures of the heart. It is classified according to the duration of the infection (days, weeks, or months) and the type of causative microorganism (bacteria, yeast, or fungi).
The characteristic lesion of infective endocarditis is the endocardial vegetation. This consists of an abnormal aggregate of platelets, fibrin, bacteria, and inflammatory cells that adheres to the inner surface of the heart—typically a heart valve—and can detach, causing infectious emboli in distant organs such as the skin, nervous system, or extremities.
It is considered a serious disease. Although most cases are curable, it carries significant complications and mortality even with treatment. In many cases, achieving a definitive cure requires surgical intervention to remove affected tissue and replace the valve with an artificial one.
In the acute form, infective endocarditis may cause high fever, chills, prostration, and rapid deterioration of general condition over hours or days.
In subacute forms, with progression over weeks or months, the main symptoms are fatigue, loss of appetite, and mild fever. In these cases, characteristic skin lesions, such as nodules or spots, may also occur, although not always.
In patients with severe valve involvement, valvular dysfunction may develop, resulting in heart failure symptoms, such as significant shortness of breath and edema in the lower limbs.
Infective endocarditis has a global incidence of 2–3 cases per 100,000 people per year. In Catalonia, around 200 new cases are diagnosed annually. Its incidence increases significantly with age, reaching 15–30 cases per 100,000 people per year in individuals over 65—about 10 times higher than in younger populations.
The causative agents have changed over recent decades. Previously, streptococci, particularly viridans streptococci, were the most common. Currently, the most frequent pathogens are staphylococci, followed by streptococci and enterococci. However, any microorganism present in the blood can adhere to a heart valve, especially if it is previously damaged or artificial.
Diagnosis is primarily based on:
-blood cultures: to identify the causative microorganism and guide selection of the appropriate antibiotic therapy.
-echocardiography: to locate endocardial vegetations, assess valve function, and determine the need for surgery in certain patients.
In some cases, additional imaging (CT scans, nuclear medicine scans) is necessary to detect peripheral emboli, which are common at diagnosis or during treatment.
Treatment of infective endocarditis is antibiotic therapy, specifically targeted at the causative microorganism. Doses are high and prolonged, because vegetations are poorly vascularized and the antibiotic must penetrate by diffusion from circulating blood.
Patients who do not respond adequately to antibiotic therapy, or who develop significant valvular damage, may require valve replacement surgery.
Blood cultures and echocardiography, both at diagnosis and during follow-up, to monitor disease progression.
In individuals with known valvular abnormalities, antibiotic prophylaxis is recommended before dental procedures or gum surgery, following specialist guidance.
Preventive measures should also be taken during endoscopic procedures, especially upper gastrointestinal endoscopy (gastroscopy), according to the prescribed antibiotic regimen.
This prevention is crucial because the presence of bacteria in the bloodstream during such procedures significantly increases the risk of infective endocarditis.
This is an inflammation or infection of the conjunctiva, the transparent membrane that covers the eyelid and the white part of the eyeball. When small blood vessels of the conjunctiva become inflamed, they become more visible, so this layer turns red. The most common cause is a viral or bacterial infection, a reaction to an allergen or an irritant. This is a very common condition in the general population.
The following three types of conjunctivitis may be found:
It can affect any person of any age.
Diagnosis of conjunctivitis is clinical, by means of good medical history and an examination by the primary care doctor and/or, on specific occasions, by the ophthalmologist.
The most common test is a biomicroscopic examination with a slit lamp. On certain occasions a sample of conjunctival exudate can be collected for a culture, especially if the suspicion is of a bacterial conjunctivitis.
For viral conjunctivitis, being a viral infection, the main treatment is waiting, as the body itself is able to combat the infection. Hydrating eye drops can be used frequently to soothe the discomfort, in addition to washing with saline solution if there is an accumulation of secretions, or even sometimes additional anti-inflammatory drops according to the clinical picture.
Bacterial conjunctivitis is usually treated with topical antibiotics, except on certain occasions that may require systemic antibiotic treatment. Hydrating eye drops can also be used to soothe the discomfort in addition to washing with saline solution if there is an accumulation of secretions.
In the case of an allergic conjunctivitis, anti-histamines can normally be used to reduce itching and inflammation, although hydrating drops and washing with cold saline solution can also be useful for soothing symptoms.
As for conjunctivitis due to irritants, hydrating eye drops and washing with saline solution are usually enough, although depending on the origin of the irritation, it can sometimes require an anti-inflammatory or other types of drops.
In the case of viral and bacterial conjunctivitis, prevention could be carried out by means of good hygiene (washing your hands, not touching your eyes if you live with an affected person, changing the pillows and not sharing towels).
In the case of allergic conjunctivitis, prevention is possible, avoiding contact with the allergen if known.
And for conjunctivitis due to irritants, prevention could be done through eye protection (protective glasses), especially in work environments where there may be a risk of contact with chemical substances or risk of foreign bodies entering the eye.
Infectious Diseases, General Hospital
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