The key initial management for tension pneumothorax is needle thoracocentesis. This procedure is crucial as it rapidly decompresses the tension and allows for more definitive management to be implemented. It is important to note that according to ATLS guidelines, needle thoracocentesis should no longer be performed at the second intercostal space midclavicular line. Studies have shown that the fourth or fifth intercostal space midaxillary line is more successful in reaching the thoracic cavity in adult patients. Therefore, ATLS now recommends this location for needle decompression in adult patients.

Further Reading:

A pneumothorax is an abnormal collection of air in the pleural cavity of the lung. It can be classified by cause as primary spontaneous, secondary spontaneous, or traumatic. Primary spontaneous pneumothorax occurs without any obvious cause in the absence of underlying lung disease, while secondary spontaneous pneumothorax occurs in patients with significant underlying lung diseases. Traumatic pneumothorax is caused by trauma to the lung, often from blunt or penetrating chest wall injuries.

Tension pneumothorax is a life-threatening condition where the collection of air in the pleural cavity expands and compresses normal lung tissue and mediastinal structures. It can be caused by any of the aforementioned types of pneumothorax. Immediate management of tension pneumothorax involves the ABCDE approach, which includes ensuring a patent airway, controlling the C-spine, providing supplemental oxygen, establishing IV access for fluid resuscitation, and assessing and managing other injuries.

Treatment of tension pneumothorax involves needle thoracocentesis as a temporary measure to provide immediate decompression, followed by tube thoracostomy as definitive management. Needle thoracocentesis involves inserting a 14g cannula into the pleural space, typically via the 4th or 5th intercostal space midaxillary line. If the patient is peri-arrest, immediate thoracostomy is advised.

The pathophysiology of tension pneumothorax involves disruption to the visceral or parietal pleura, allowing air to flow into the pleural space. This can occur through an injury to the lung parenchyma and visceral pleura, or through an entry wound to the external chest wall in the case of a sucking pneumothorax. Injured tissue forms a one-way valve, allowing air to enter the pleural space with inhalation but prohibiting air outflow. This leads to a progressive increase in the volume of non-absorbable intrapleural air with each inspiration, causing pleural volume and pressure to rise within the affected hemithorax.

The recommended daily oral dose for adults is 900 mg, which should be taken in 2-3 divided doses. For severe asthma or COPD, the initial intravenous dose is 5 mg/kg and should be administered over 10-20 minutes. This can be followed by a continuous infusion of 0.5 mg/kg/hour. In the case of a 50 kg individual, the appropriate infusion rate would be 25 mg/hour. It is important to note that the therapeutic range for aminophylline is narrow, ranging from 10-20 microgram/ml. Therefore, it is beneficial to estimate the plasma concentration of aminophylline during long-term treatment.

Asthma can be categorized into three levels of severity: moderate exacerbation, acute severe asthma, and life-threatening asthma.

Moderate exacerbation is characterized by an increase in symptoms and a peak expiratory flow rate (PEFR) that is between 50-75% of the best or predicted value. There are no signs of acute severe asthma present.

Acute severe asthma is indicated by a PEFR that is between 33-50% of the best or predicted value. Additionally, the respiratory rate is higher than 25 breaths per minute and the heart rate is higher than 110 beats per minute. People experiencing acute severe asthma may have difficulty completing sentences in one breath.

Life-threatening asthma is the most severe level and requires immediate medical attention. It is identified by a PEFR that is less than 33% of the best or predicted value. Oxygen saturations are below 92% when breathing regular air. The PaCO2 levels are within the normal range of 4.6-6.0 KPa, but the PaO2 levels are below 8 KPa. Other symptoms include a silent chest, cyanosis, feeble respiratory effort, bradycardia, arrhythmia, hypotension, and signs of exhaustion, confusion, or coma.

It is important to recognize the severity of asthma symptoms in order to provide appropriate medical care and intervention.

The recommended daily oral dose for adults is 900 mg, which should be taken in 2-3 divided doses. For severe asthma or COPD, the initial intravenous dose is 5 mg/kg and should be administered over 10-20 minutes. This can be followed by a continuous infusion of 0.5 mg/kg/hour. In the case of a patient weighing 60 kg, the appropriate loading dose would be 300 mg. It is important to note that the therapeutic range for aminophylline is narrow, ranging from 10-20 microgram/ml. Therefore, it is beneficial to estimate the plasma concentration of aminophylline during long-term treatment.

This presentation strongly suggests a diagnosis of whooping cough, which is an infection of the upper respiratory tract caused by the bacteria Bordetella pertussis. The disease is highly contagious and is transmitted through respiratory droplets. The incubation period is typically 7-21 days, and it is estimated that about 90% of close household contacts will become infected.

The clinical course of whooping cough can be divided into two stages. The first stage, known as the catarrhal stage, is similar to a mild respiratory infection with symptoms such as low-grade fever and a runny nose. A cough may be present, but it is usually mild compared to the second stage. This phase typically lasts about a week.

The second stage, called the paroxysmal stage, is characterized by the development of a distinctive cough. The coughing occurs in spasms, often preceded by an inspiratory whoop sound. These spasms are followed by a series of rapid, hacking coughs. Patients may experience vomiting and may develop subconjunctival hemorrhages and petechiae. Between spasms, patients generally feel well and there are usually no abnormal chest findings. This stage can last up to 3 months, with a gradual recovery over this period. The later stages of this phase are sometimes referred to as the convalescent stage.

Complications of whooping cough can include secondary pneumonia, rib fractures, pneumothorax, hernias, syncopal episodes, encephalopathy, and seizures.

Public Health England (PHE) provides recommendations for testing for whooping cough based on the age of the patient, time since onset of illness, and severity of presentation. For infants under 12 months of age, hospitalised patients should undergo PCR testing, while non-hospitalised patients within two weeks of onset should be tested using culture of a nasopharyngeal swab or aspirate. Non-hospitalised patients presenting over two weeks after onset should be investigated with serology for anti-pertussis toxin IgG antibody levels.

For children over 12 months of age and adults, patients within two weeks of onset should be tested using culture of a nasopharyngeal swab or aspirate. Patients aged 5 to 16 who have not received the vaccine within the last year and present over two weeks after onset should have oral fluid testing for anti-pertussis toxin IgG antibody levels.

The diving reflex occurs when the face comes into contact with cold water, leading to apnoea, bradycardia, and peripheral vasoconstriction. This response helps decrease the workload on the heart, lower oxygen demand in the heart muscle, and ensure adequate blood flow to the brain and vital organs. The trigeminal nerve (CN V) is responsible for transmitting sensory information, while the vagus nerve (CN X) primarily controls the motor response. This reflex is more prominent in young children and is believed to contribute to their improved survival rates in prolonged submersion in cold water.

Further Reading:

Drowning is the process of experiencing respiratory impairment from submersion or immersion in liquid. It can be classified as cold-water or warm-water drowning. Risk factors for drowning include young age and male sex. Drowning impairs lung function and gas exchange, leading to hypoxemia and acidosis. It also causes cardiovascular instability, which contributes to metabolic acidosis and cell death.

When someone is submerged or immersed, they will voluntarily hold their breath to prevent aspiration of water. However, continued breath holding causes progressive hypoxia and hypercapnia, leading to acidosis. Eventually, the respiratory center sends signals to the respiratory muscles, forcing the individual to take an involuntary breath and allowing water to be aspirated into the lungs. Water entering the lungs stimulates a reflex laryngospasm that prevents further penetration of water. Aspirated water can cause significant hypoxia and damage to the alveoli, leading to acute respiratory distress syndrome (ARDS).

Complications of drowning include cardiac ischemia and infarction, infection with waterborne pathogens, hypothermia, neurological damage, rhabdomyolysis, acute tubular necrosis, and disseminated intravascular coagulation (DIC).

In children, the diving reflex helps reduce hypoxic injury during submersion. It causes apnea, bradycardia, and peripheral vasoconstriction, reducing cardiac output and myocardial oxygen demand while maintaining perfusion of the brain and vital organs.

Associated injuries with drowning include head and cervical spine injuries in patients rescued from shallow water. Investigations for drowning include arterial blood gases, chest X-ray, ECG and cardiac monitoring, core temperature measurement, and blood and sputum cultures if secondary infection is suspected.

Management of drowning involves extricating the patient from water in a horizontal position with spinal precautions if possible. Cardiovascular considerations should be taken into account when removing patients from water to prevent hypotension and circulatory collapse. Airway management, supplemental oxygen, and ventilation strategies are important in maintaining oxygenation and preventing further lung injury. Correcting hypotension, electrolyte disturbances, and hypothermia is also necessary. Attempting to drain water from the lungs is ineffective.

Patients without associated physical injury who are asymptomatic and have no evidence of respiratory compromise after six hours can be safely discharged home. Ventilation strategies aim to maintain oxygenation while minimizing ventilator-associated lung injury.

One of the clinical features of a tension pneumothorax is the deviation of the trachea away from the side where the pneumothorax is located. This particular feature is typically observed in cases of right-sided tension pneumothorax.

Further Reading:

A pneumothorax is an abnormal collection of air in the pleural cavity of the lung. It can be classified by cause as primary spontaneous, secondary spontaneous, or traumatic. Primary spontaneous pneumothorax occurs without any obvious cause in the absence of underlying lung disease, while secondary spontaneous pneumothorax occurs in patients with significant underlying lung diseases. Traumatic pneumothorax is caused by trauma to the lung, often from blunt or penetrating chest wall injuries.

Tension pneumothorax is a life-threatening condition where the collection of air in the pleural cavity expands and compresses normal lung tissue and mediastinal structures. It can be caused by any of the aforementioned types of pneumothorax. Immediate management of tension pneumothorax involves the ABCDE approach, which includes ensuring a patent airway, controlling the C-spine, providing supplemental oxygen, establishing IV access for fluid resuscitation, and assessing and managing other injuries.

Treatment of tension pneumothorax involves needle thoracocentesis as a temporary measure to provide immediate decompression, followed by tube thoracostomy as definitive management. Needle thoracocentesis involves inserting a 14g cannula into the pleural space, typically via the 4th or 5th intercostal space midaxillary line. If the patient is peri-arrest, immediate thoracostomy is advised.

The pathophysiology of tension pneumothorax involves disruption to the visceral or parietal pleura, allowing air to flow into the pleural space. This can occur through an injury to the lung parenchyma and visceral pleura, or through an entry wound to the external chest wall in the case of a sucking pneumothorax. Injured tissue forms a one-way valve, allowing air to enter the pleural space with inhalation but prohibiting air outflow. This leads to a progressive increase in the volume of non-absorbable intrapleural air with each inspiration, causing pleural volume and pressure to rise within the affected hemithorax.

The BTS guidelines for acute asthma in children recommend administering oral steroids early in the treatment of asthma attacks. It is advised to give a dose of 20 mg prednisolone for children aged 2–5 years and a dose of 30–40 mg for children over 5 years old. If a child is already taking maintenance steroid tablets, they should receive 2 mg/kg prednisolone, up to a maximum dose of 60 mg. If a child vomits after taking the medication, the dose of prednisolone should be repeated. In cases where a child is unable to keep down orally ingested medication, intravenous steroids should be considered. Typically, treatment for up to three days is sufficient, but the duration of the course should be adjusted based on the time needed for recovery. Tapering off the medication is not necessary unless the steroid course exceeds 14 days. For more information, refer to the BTS/SIGN Guideline on the Management of Asthma.

Croup, also known as laryngo-tracheo-bronchitis, is typically caused by the parainfluenza virus. Other viruses such as rhinovirus, influenza, and respiratory syncytial viruses can also be responsible. Before the onset of stridor, there is often a mild cold-like illness that lasts for 1-2 days. Symptoms usually reach their peak within 1-3 days, with the cough often being more troublesome at night. A milder cough may persist for another 7-10 days.

A distinctive feature of croup is a barking cough, but it does not indicate the severity of the condition. To reduce airway swelling, dexamethasone and prednisolone are commonly prescribed. If a child is experiencing vomiting, nebulized budesonide can be used as an alternative. However, it is important to note that steroids do not shorten the duration of the illness. In severe cases, nebulized adrenaline can be administered.

Hospitalization for croup is uncommon and typically reserved for children who are experiencing worsening respiratory distress or showing signs of drowsiness or agitation.

This patient exhibits signs of potentially life-threatening asthma. In adults, acute severe asthma is characterized by a peak expiratory flow (PEF) of 33-50% of the best or predicted value, a respiratory rate exceeding 25 breaths per minute, a heart rate over 110 beats per minute, and an inability to complete sentences in one breath. On the other hand, life-threatening asthma is indicated by a PEF below 33% of the best or predicted value, a blood oxygen saturation (SpO2) below 92%, a partial pressure of oxygen (PaO2) below 8 kPA, a normal partial pressure of carbon dioxide (PaCO2) within the range of 4.6-6.0 kPa, a silent chest, cyanosis, poor respiratory effort, exhaustion, altered consciousness, and hypotension.

To address acute asthma in adults, the recommended drug doses include administering 5 mg of salbutamol through an oxygen-driven nebulizer, delivering 500 mcg of ipratropium bromide via an oxygen-driven nebulizer, providing 40-50 mg of prednisolone orally, administering 100 mg of hydrocortisone intravenously, and infusing 1.2-2 g of magnesium sulfate intravenously over a period of 20 minutes.

According to the current Advanced Life Support (ALS) guidelines, it is advisable to seek senior advice before considering the use of intravenous aminophylline in cases of severe or life-threatening asthma. If used, a loading dose of 5 mg/kg should be given over 20 minutes, followed by a continuous infusion of 500-700 mcg/kg/hour. To prevent toxicity, it is important to maintain serum theophylline levels below 20 mcg/ml.

In situations where inhaled therapy is not feasible, intravenous salbutamol can be considered, with a slow administration of 250 mcg. However, it should only be used when a patient is receiving bag-mask ventilation.

It is worth noting that there is currently no evidence supporting the use of leukotriene receptor antagonists, such as montelukast, or Heliox in the management of acute severe or life-threatening asthma.