The increase in the number of COVID-19 cases across the country has led to a big spike in demand for oxygen concentrators.
However, many people don't know about what oxygen concentrators are and how to use them.
Here's a quick lowdown on the same.
To survive, we need a steady supply of oxygen, flowing from our lungs to various cells in the body. COVID-19 is a respiratory disease that affects our lungs and can cause the oxygen level to drop to dangerous levels. In such a situation, we would need to undergo what is known as oxygen therapy – using oxygen for medical treatment, to enhance our oxygen levels to clinically acceptable levels.
Oxygen level is measured by oxygen saturation, known briefly as SpO2. This is a measure of the amount of oxygen-carrying haemoglobin in the blood. A healthy individual with normal lungs will have an arterial oxygen saturation of 95% – 100%.
According to a WHO training manual on pulse oximetry, if the oxygen saturation is 94% or lower, the patient needs to be treated quickly. A saturation of less than 90% is a clinical emergency. Hence, to maintain an adequate level of oxygen an Oxygen Concentrator is needed.
Oxygen Concentrator – how does it work?
We know that atmospheric air has roughly 78 per cent nitrogen and 21 per cent oxygen. Oxygen concentrators are simple devices that do precisely what their name promises – they take in ambient air and increase the oxygen concentration, by filtering out and throwing away nitrogen.
These Oxygen concentrators work the same way in supplying oxygen needed by the body such as oxygen tanks or cylinders, with the use of a cannula, oxygen masks or nasal tubes. The difference is that, while the cylinders need to be refilled, the Oxygen Concentrators can work 24 x 7.
So, who can use them, and when?
Does this mean that anyone who finds their oxygen level falling below acceptable levels can use a concentrator and help oneself? Absolutely not.
Speaking to PIB on the appropriate usage of concentrators, Professor and Head of Department Anaesthesia, B. J. Medical College, Pune, Prof. Sanyogita Naik said: "Oxygen concentrators can be used only in moderate cases of COVID-19 when the patient experiences drop in oxygen levels, where the oxygen requirement is a maximum of 5 litres per minute."
The professor added that oxygen concentrators are also very useful for patients experiencing post-COVID complications which necessitate oxygen therapy.
Can we use them on our own?
The answer is a strict no. Speaking at a webinar organized by PIB on April 30th, Dr Chaitanya H Balakrishnan, Covid Co-ordinator, St. John's Medical College Hospital, Bangalore made it abundantly clear that using oxygen concentrator without medical guidance can be very harmful. "Patients with moderate pneumonia induced by COVID-19 - with oxygen saturation less than 94 - can benefit from supplemental oxygen given through oxygen concentrator, but only till they get hospital admission. However, patients using it themselves without suitable medical advice can be harmful."
Dr Chaitanya summarised saying, "So, till you get a bed, oxygen concentrator can be beneficial, but definitely not without guidance from chest physician or internal medicine specialist. It also depends on patients' pre-existing lung conditions."
Prof Sanyogita too says that both purchase and usage of concentrators is to be done only based on prescription by a medical doctor. Depending upon the capacity, O2 Concentrators cost upwards of Rs 30,000.
O2 Concentrators market in India
India has seen a big spurt in the manufacture and sale of Oxygen concentrators. Besides multi-national brands, several Indian start-ups, funded under the CAWACH (Centre for Augmenting War with Covid 19 Health Crisis) programme of the Department of Science & Technology, have developed efficient and cost-effective Oxygen Concentrators.
Given their usefulness during the second wave of Covid Pandemic, 1 lakh Oxygen Concentrators are being procured through PM CARES fund.