This patient has returned from West Africa exhibiting symptoms and signs consistent with a viral haemorrhagic fever, which strongly suggests a diagnosis of Ebola. Ebola, also known as Ebola haemorrhagic fever, is caused by RNA viruses belonging to the Ebola Virus genus. The virus is zoonotic, meaning it can be transmitted from animals to humans, with fruit bats believed to be the natural reservoir. It spreads through direct contact with bodily fluids and may also be transmitted through sexual intercourse. The incubation period typically ranges from 4 to 10 days, but it can extend up to 3 weeks.

The initial manifestations of the disease usually resemble those of a flu-like illness, characterized by fever, muscle pain, and headaches. However, the condition rapidly deteriorates, leading to worsening fever, vomiting, diarrhea, and abdominal pain. In a significant proportion of cases (30-50%), patients develop internal and external bleeding, presenting with petechiae, purpura, epistaxis, gastrointestinal bleeding, and bleeding from the urinary tract. Therefore, immediate isolation of suspected Ebola cases is crucial, followed by prompt transportation to a High-Level Isolation Unit. Contacting the Health Protection Team and initiating comprehensive public health measures is essential.

Healthcare staff involved in the management of suspected Ebola cases must adhere to strict personal protection protocols. This includes practicing thorough hand hygiene, wearing double gloves, utilizing fluid repellent disposable coveralls or gowns, donning full-length plastic aprons over the coveralls or gowns, wearing head covers such as surgical caps, using fluid repellent footwear like surgical boots, and wearing full face shields or goggles along with fluid repellent FFP3 respirators.

The management of Ebola primarily focuses on providing supportive care, often requiring intensive care treatment if available. The mortality rate of Ebola varies across different outbreaks, ranging from 50% to 90%. Death frequently occurs as a result of hypovolemic shock.

Respiratory alkalosis can be caused by hyperventilation, such as during periods of anxiety. It can also be a result of conditions like pulmonary embolism, CNS disorders (such as stroke or encephalitis), altitude, pregnancy, or the early stages of aspirin overdose.

Respiratory acidosis is often associated with chronic obstructive pulmonary disease (COPD) or life-threatening asthma. Other causes include pulmonary edema, sedative drug overdose (such as opiates or benzodiazepines), neuromuscular disease, obesity, or certain medications.

Metabolic alkalosis can occur due to vomiting, potassium depletion (often caused by diuretic usage), Cushing’s syndrome, or Conn’s syndrome.

Metabolic acidosis with a raised anion gap can be caused by conditions like lactic acidosis (which can result from hypoxemia, shock, sepsis, or infarction) or ketoacidosis (commonly seen in diabetes, starvation, or alcohol excess). Other causes include renal failure or poisoning (such as late stages of aspirin overdose, methanol, or ethylene glycol).

Metabolic acidosis with a normal anion gap can be attributed to conditions like renal tubular acidosis, diarrhea, ammonium chloride ingestion, or adrenal insufficiency.

Norovirus is the leading cause of gastroenteritis in adults in the UK. Viruses are responsible for the majority of cases of infectious diarrhea, with norovirus being the most common culprit in adults. Among young children, rotavirus is the primary pathogen, although its prevalence has decreased since the introduction of a rotavirus vaccine. As of 2023, rotavirus remains the most common cause of viral gastroenteritis in children.

Further Reading:

Gastroenteritis is a transient disorder characterized by the sudden onset of diarrhea, with or without vomiting. It is caused by enteric infections with viruses, bacteria, or parasites. The most common viral causes of gastroenteritis in adults include norovirus, rotavirus, and adenovirus. Bacterial pathogens such as Campylobacter jejuni and coli, Escherichia coli, Clostridium perfringens, Bacillus cereus, Staphylococcus aureus, Salmonella typhi and paratyphi, and Shigella dysenteriae, flexneri, boydii, and sonnei can also cause gastroenteritis. Parasites such as Cryptosporidium, Entamoeba histolytica, and Giardia intestinalis or Giardia lamblia can also lead to diarrhea.

Diagnosis of gastroenteritis is usually based on clinical symptoms, and investigations are not required in many cases. However, stool culture may be indicated in certain situations, such as when the patient is systemically unwell or immunocompromised, has acute painful diarrhea or blood in the stool suggesting dysentery, has recently taken antibiotics or acid-suppressing medications, or has not resolved diarrhea by day 7 or has recurrent diarrhea.

Management of gastroenteritis in adults typically involves advice on oral rehydration. Intravenous rehydration and more intensive treatment may be necessary for patients who are systemically unwell, exhibit severe dehydration, or have intractable vomiting or high-output diarrhea. Antibiotics are not routinely required unless a specific organism is identified that requires treatment. Antidiarrheal drugs, antiemetics, and probiotics are not routinely recommended.

Complications of gastroenteritis can occur, particularly in young children, the elderly, pregnant women, and immunocompromised individuals. These complications include dehydration, electrolyte disturbance, acute kidney injury, haemorrhagic colitis, haemolytic uraemic syndrome, reactive arthritis, Reiter’s syndrome, aortitis, osteomyelitis, sepsis, toxic megacolon, pancreatitis, sclerosing cholangitis, liver cirrhosis, weight loss, chronic diarrhea, irritable bowel syndrome, inflammatory bowel disease, acquired lactose intolerance, Guillain-Barré syndrome, meningitis, invasive entamoeba infection, and liver abscesses.

The sepsis 6 pathway is a time-sensitive protocol that should be started promptly and all 6 initial steps should be completed within 1 hour. It is important not to confuse the sepsis 6 pathway with the 6 hour care bundle. Time is of the essence when managing septic patients, and initiating the sepsis 6 pathway immediately has been proven to enhance survival rates in sepsis patients.

Further Reading:

There are multiple definitions of sepsis, leading to confusion among healthcare professionals. The Sepsis 3 definition describes sepsis as life-threatening organ dysfunction caused by a dysregulated host response to infection. The Sepsis 2 definition includes infection plus two or more SIRS criteria. The NICE definition states that sepsis is a clinical syndrome triggered by the presence of infection in the blood, activating the body’s immune and coagulation systems. The Sepsis Trust defines sepsis as a dysregulated host response to infection mediated by the immune system, resulting in organ dysfunction, shock, and potentially death.

The confusion surrounding sepsis terminology is further compounded by the different versions of sepsis definitions, known as Sepsis 1, Sepsis 2, and Sepsis 3. The UK organizations RCEM and NICE have not fully adopted the changes introduced in Sepsis 3, causing additional confusion. While Sepsis 3 introduces the use of SOFA scores and abandons SIRS criteria, NICE and the Sepsis Trust have rejected the use of SOFA scores and continue to rely on SIRS criteria. This discrepancy creates challenges for emergency department doctors in both exams and daily clinical practice.

To provide some clarity, RCEM now recommends referring to national standards organizations such as NICE, SIGN, BTS, or others relevant to the area. The Sepsis Trust, in collaboration with RCEM and NICE, has published a toolkit that serves as a definitive reference point for sepsis management based on the sepsis 3 update.

There is a consensus internationally that the terms SIRS and severe sepsis are outdated and should be abandoned. Instead, the terms sepsis and septic shock should be used. NICE defines septic shock as a life-threatening condition characterized by low blood pressure despite adequate fluid replacement and organ dysfunction or failure. Sepsis 3 defines septic shock as persisting hypotension requiring vasopressors to maintain a mean arterial pressure of 65 mmHg or more, along with a serum lactate level greater than 2 mmol/l despite adequate volume resuscitation.

NICE encourages clinicians to adopt an approach of considering sepsis in all patients, rather than relying solely on strict definitions. Early warning or flag systems can help identify patients with possible sepsis.

A normal CD4 count ranges from 500-1000 cells/mm3. In individuals diagnosed with HIV, the CD4 count is typically monitored every 3-6 months. It is important to note that the CD4 count can fluctuate on a daily basis and can be influenced by the timing of the blood test as well as the presence of other infections or illnesses.

When the CD4 count falls below 350 cells/mm3, it is recommended to consider starting antiretroviral therapy. A CD4 count below 200 cells/mm3 is indicative of advanced HIV disease, also known as AIDS defining.

The traffic light system is a useful tool for evaluating the potential risk of serious illness in children. This system categorizes clinical features into three groups based on severity: red (high-risk), amber (intermediate-risk), and green (low-risk).

Children displaying any of the following symptoms or signs fall into the high-risk group for serious illness: pale/mottled/ashen/blue skin, lips or tongue; lack of response to social cues; appearing unwell to a healthcare professional; inability to wake or stay awake when roused; weak, high-pitched, or continuous cry; grunting; respiratory rate exceeding 60 breaths per minute; moderate or severe chest indrawing; reduced skin turgor; and bulging fontanelle.

Children exhibiting any of the following symptoms or signs are considered at least intermediate-risk for serious illness: pallor of skin, lips or tongue reported by parent or caregiver; abnormal response to social cues; absence of a smile; waking only with prolonged stimulation; decreased activity; nasal flaring; dry mucous membranes; poor feeding in infants; reduced urine output; and rigors.

Children displaying any of the following symptoms or signs are classified as low-risk for serious illness: normal color of skin, lips, and tongue; normal response to social cues; contentment and smiles; staying awake or quickly awakening; strong normal cry or absence of crying; normal skin and eyes; and moist mucous membranes.

To summarize, children with fever and any symptoms or signs in the red column are considered high-risk, while those with fever and any symptoms or signs in the amber column (but none in the red column) are considered intermediate-risk. Children with symptoms and signs in the green column (and none in the amber or red columns) are classified as low-risk.

For more information, you can refer to the NICE guidelines on the assessment and initial management of fever in children under 5, as well as the NICE Clinical Knowledge Summary on the management of feverish children.

This is a complex situation that presents both ethical and medico-legal challenges. While patients have a right to confidentiality, it is important to recognize that this right is not absolute and may not apply in every circumstance. There are certain situations where it is appropriate to breach confidentiality, such as when mandated by law or when there is a threat to public health. However, it is crucial to make every effort to persuade the patient against disclosure and to inform them of your intentions.

In this particular case, the patient has disclosed to you that they have recently been diagnosed with HIV, which they believe was contracted from a sexual encounter outside of their marriage. They have explicitly stated that they do not want you to inform their wife, who is in the early stages of pregnancy. Before taking any action, it is advisable to gather all the relevant facts and confirm the patient’s HIV diagnosis through their health records, including any other blood-borne viruses.

If the facts are indeed confirmed, it is important to continue efforts to persuade the patient of the necessity for their wife to be informed. If she has been exposed, she could greatly benefit from testing and starting antiretroviral therapy. Additionally, specialized care during early pregnancy could help prevent transmission of the virus to the unborn child. However, if the patient continues to refuse disclosure, you have the right to breach confidentiality, but it is crucial to inform the patient of your intentions beforehand. Seeking support from your defense organization is also recommended in such situations.

For further information, you may refer to the GMC Guidance on Confidentiality, specifically the section on disclosing information about serious communicable diseases.

Plasmodium falciparum malaria is transmitted by female mosquitoes of the Anopheles genus. The Aedes genus, on the other hand, is responsible for spreading diseases like dengue fever and yellow fever. The parasite enters hepatocytes and undergoes asexual reproduction, resulting in the release of merozoites into the bloodstream. These merozoites then invade the red blood cells of the host. The incubation period for Plasmodium falciparum malaria ranges from 7 to 14 days.

The main symptom of malaria is known as the malarial paroxysm, which consists of a cyclical pattern of cold chills, followed by a stage of intense heat, and finally a period of profuse sweating as the fever subsides. However, some individuals may experience a continuous fever instead.

Currently, the recommended treatment for P. falciparum malaria is artemisinin-based combination therapy (ACT). This involves combining fast-acting artemisinin-based compounds with drugs from a different class. Companion drugs used in ACT include lumefantrine, mefloquine, amodiaquine, sulfadoxine/pyrimethamine, piperaquine, and chlorproguanil/dapsone. Artemisinin derivatives such as dihydroartemisinin, artesunate, and artemether are also used.

If artemisinin combination therapy is not available, oral quinine or atovaquone with proguanil hydrochloride can be used as an alternative. However, quinine is not well-tolerated for prolonged treatment and should be combined with another drug, typically oral doxycycline (or clindamycin for pregnant women and young children).

Severe or complicated cases of falciparum malaria require specialized care in a high dependency unit or intensive care setting. Intravenous artesunate is recommended for all patients with severe or complicated falciparum malaria, as well as those at high risk of developing severe disease (e.g., if more than 2% of red blood cells are parasitized) or if the patient is unable to take oral treatment. After a minimum of 24 hours of intravenous artesunate treatment and improvement in the patient’s condition, a full course of artemisinin combination therapy should be administered orally.

The traffic light system is a useful tool for evaluating the potential risk of serious illness in children. This system categorizes clinical features into three groups based on severity: red (high-risk), amber (intermediate-risk), and green (low-risk).

Children displaying any of the following symptoms or signs fall into the high-risk group for serious illness: pale/mottled/ashen/blue skin, lips or tongue; lack of response to social cues; appearing unwell to a healthcare professional; inability to wake or stay awake when roused; weak, high-pitched, or continuous cry; grunting; respiratory rate exceeding 60 breaths per minute; moderate or severe chest indrawing; reduced skin turgor; and bulging fontanelle.

Children exhibiting any of the following symptoms or signs are considered at least intermediate-risk for serious illness: pallor of skin, lips or tongue reported by parent or caregiver; abnormal response to social cues; absence of a smile; waking only with prolonged stimulation; decreased activity; nasal flaring; dry mucous membranes; poor feeding in infants; reduced urine output; and rigors.

Children displaying any of the following symptoms or signs are classified as low-risk for serious illness: normal color of skin, lips, and tongue; normal response to social cues; contentment and smiles; staying awake or quickly awakening; strong normal cry or absence of crying; normal skin and eyes; and moist mucous membranes.

To summarize, children with fever and any symptoms or signs in the red column are considered high-risk, while those with fever and any symptoms or signs in the amber column (but none in the red column) are considered intermediate-risk. Children with symptoms and signs in the green column (and none in the amber or red columns) are classified as low-risk.

For more information, you can refer to the NICE guidelines on the assessment and initial management of fever in children under 5, as well as the NICE Clinical Knowledge Summary on the management of feverish children.

Faget sign is a unique occurrence where a fever and a relatively slow heart rate, known as bradycardia, are observed together. This phenomenon is sometimes called sphygmothermic dissociation. It can be observed in various infectious diseases, such as yellow fever, typhoid fever, tularaemia, brucellosis, Colorado tick fever, Legionella pneumonia, and Mycoplasma pneumonia. Normally, when a person has a fever, their heart rate increases, but in cases of Faget sign, the heart rate remains slow. Another term used to describe the combination of fever and increased heart rate is Leibermeister’s rule.

Auspitz’s sign is a characteristic feature seen in psoriasis. When the scales of psoriasis are scraped off, small bleeding spots, known as punctate bleeding spots, appear. This sign helps in the diagnosis of psoriasis.

Frank sign is a term used to describe a diagonal crease that appears on the earlobe. It has been hypothesized that this crease may be linked to cardiovascular disease and diabetes.

Levine’s sign refers to a specific response to chest pain caused by reduced blood flow to the heart, known as ischemic chest pain. In this sign, the person clenches their fist and holds it over their chest in an instinctive reaction to the pain.