Choking

Choking, scientifically known as foreign body airway obstruction (FBAO), is a critical medical event. It occurs when an object blocks the respiratory tract, which is the path for air. This blockage stops oxygen from entering the lungs. Without oxygen, the body suffers from oxygen deprivation. While the blood and lungs store some oxygen, this supply only lasts a few minutes. If breathing is not restored quickly, the situation can become fatal. In the United States, choking is the fourth leading cause of unintentional injury death.

The mechanism of choking depends on the type of obstruction. A blockage can be partial, meaning some air still moves through. It can also be a complete obstruction, where no airflow passes at all. These blockages can happen in the pharynx, the larynx, the trachea, or the lower respiratory tract. Certain objects are more dangerous than others. Foods that change shape to fit the pharynx, like marshmallows or bananas, pose a high risk. Small, round, or hard objects like nuts, grapes, or coins are also dangerous.

There are distinct groups of people at higher risk for choking. Children under three years old are especially vulnerable. This is because their airways are smaller in diameter than adults. They also have less developed chewing habits and often explore by putting objects in their mouths. In children, peanuts are a very common cause of airway obstruction. Older adults over age 75 are also at high risk. Factors like wearing dentures or having difficulty swallowing increase this risk. Neurological conditions, such as Alzheimer's or Parkinson's disease, can also impair the cough reflex.

Recognizing the signs of choking is vital for survival. A person might cough, wheeze, or experience shortness of breath. They may also make gurgling or gagging sounds. Some victims cannot speak and might clutch their throat or use hand signals. In some cases, the skin or fingertips may turn blue. This condition is called cyanosis, and it indicates a lack of oxygen. While cyanosis is a sensitive sign, it is only seen in 15% to 20% of choking episodes. If breathing is not restored, brain damage can occur in approximately three minutes. Death can follow within six to ten minutes.

Doctors use several tools to diagnose and treat choking. An X-ray uses radiation to see the lungs and airway. However, many objects are radiolucent, meaning they do not show up on an X-ray. Only about 10% of objects are radio-opaque and visible this way. A CT scan uses multiple X-rays to create a 3D model of the airway. An MRI uses magnetic fields and can be more accurate than an X-ray. For direct visualization, doctors use a bronchoscopy. This is an invasive procedure where a doctor looks inside the respiratory tract. It is often used to remove the object once the patient is stable.

First aid provides immediate ways to manage an airway obstruction. The "five and five" protocol is a common recommendation. This involves alternating five back blows with five abdominal thrusts. Back blows are firm slaps delivered between the shoulder blades. The victim should be bent forward to prevent the object from sliding deeper. Abdominal thrusts, also known as the Heimlich maneuver, involve pressing the abdomen. For infants under one year old, different techniques are required.

Choking is a significant global health issue. In 2013, choking on foreign objects caused 162,000 deaths worldwide. This represents a rate of 2.5 deaths per 100,000 people. In 1990, the rate was slightly higher at 2.9 per 100,000. In the United States, between 4,500 and 5,000 people die from choking annually. Many episodes go unreported because they are brief and resolve quickly. Understanding the causes and the correct first aid can help prevent these tragic outcomes.