COVID – 19: A pandemic disease and its relation to Pranavahasrotas (Respiratory system)-A review

COVID-19 is an infectious pandemic disease caused by the virus called as SARS-CoV-2. It is the pathogens that primarily target the respiratory system of human beings. The most common symptoms at the beginning of COVID-19 illness are, cough, fever, muscle pain, diarrhoea, headache, and Acute Respiratory Distress Syndrome occurs in severe cases. The idea of Srotas, in all different appropriate meaning, is still related in the current situation and might give different visions if revisited. Hridaya (Heart) and Mahasrotas(Gastrointestinal tract) and are the origins of Pranavahasrotas (respiratory system). In the view of the current review, the introductory classical text of Ayurveda like Charak Samhita and compilation textbooks, research publication and internet sources are also reviewed to explore the relation of Pranavaha srotas and COVID-19 disease. In the diseases of Pranavaha srotas, similar symptoms are found as it is in connection with an organ like heart, lungs, brain and Gastro-intestinal tract. The treatment protocols for diseases of Pranvahahasrotas includes general Snehan Karma(Oleation) and Swedan Karma (Sudation) therapies, Vamana(emesis), Dhumapana (medicated smoking) therapy, Rasayan therapy(Rejuvenation Therapy), treatment of Jwar(fever) and classical formulations like Kantakari ghrita, Shrungyadi Churna, Talisadi churna, Vasa Avaleha, Kanakasava, Shwasakuthar Rasa, Mahalaxmivilas rasa etc. recommended. So current review will be useful for research on treatment protocol mentioned for the management of diseases of Pranavaha srotas given COVID-19 and also as a reference for additional safety and ef icacy studies; pharmaceutical manufacturing as well as standardization of classical formulations stated for the treating diseases of Pranavaha srotas.


INTRODUCTION
The coronavirus disease  pandemic, which originated in the city of Wuhan, China, has quickly spread to different countries, with many cases having been reported worldwide. It is the biggest challenge that the world has faced after the Second World War, which caused a global health disaster. It is caused by a novel coronavirus called Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). In the word COVID-19"; the "CO" means corona-virus, "VI" is virus and "D" means dis-ease Zhou et al., 2020). The virus has reached to every continent except Antarctica, and emergence in Asia in late last year. Till 11 May 2020, over 4.1 million individuals worldwide conirmed positive for COVID-19 with, and more than 283,000 deaths have been reported (David, 2020;Parwe et al., 2020).
Lockdown restrictions were put in place in many countries to slow-down the spread of the virus and prevent community transmission (Nisargandha and DadaraoParwe, 2020). It includes stopping large gatherings such as sporting events, concerts, restrictive travel, quarantining citizens, and schools and contact tracing, testing of suspected cases. The contagion is moving like upsurge, one that may yet smash on those least able to cope. But COVID-19 is much more than a health crisis. By stressing every one of the countries it touches, it will leave a profound scar that has the potential to create an overwhelming economic, social, and political emergency (Khanna et al., 2020).
Pandemic is described as disease occurrence in multiple countries around the world at the same time. Coronavirus emerges as a new kind of virus that not only able to infect people easily but can spread from person-to-person constantly and ef iciently. This virus spread is vital, and currently, there is no vaccine available and also no treatments able to prevent it yet. COVID -19 has common symptoms like are cough, fever, muscle pain, shortness of breath. Sore throat, runny nose, body ache nasal congestion, diarrhoea can occur in some patients. These symptoms begin gradually and are usually mild. Some people feel well and become infected without any symptoms. Without needing special treatment, most people (about 80%) recover from the disease. Dif iculty in breathing also develops in the patient who becomes seriously ill by this disease. Serious illness develops in older people and to those with underlying medical problems like hypertension, heart diseases or diabetes .
Many scholars considered the Science of life Ayurveda to be the oldest healing science. It encourages the maintenance of health through right thinking, proper diet, lifestyle and the use of herbs close, and also it places great importance on disease prevention. In the view of COVID-19 pandemic, Ayurveda interventions become even more signi icant by the fact that there is a detailed description of causation and management of epidemic (Janapadodhwamsa) (Jyotirmoy and Rekha, 2016). In Ayurveda, there is a term called " Srotas," i.e. Channel of circulation or path which carry vital nutrients to different organs of the body. The Srotas acts as one of the essential factors in the pathogenesis of diseases, as it is said that diseases are caused because of the obstacle in the Srotas.
The Srotas which related to the transfusion and transportation of Prana Vayu (Life Sustaining air) in the human body is called as Pranavaha Srotas (respiratory system). There are 13 signi icant srotas mentioned in Ayurveda out of which Pranavaha Srotas is important & main Srotas of the body. It is in connection Heart, brain, gastro-intestinal tract and various essential arteries of the body. It consists of the organ from nose to alveoli via external nares, nasal chambers, pharynx, trachea, bronchus & bronchioles, which carry oxygen or carbon dioxide to lungs and from lungs, these gases are transported to heart by pulmonary veins (Patil and Bhujade, 2017). In the current review, an attempt has been made to correlate the Covid-19 disease and Pranavaha Srotas(respiratory system), which will help to investigate Ayurveda treatment protocols in the management of COVID-19.

MATERIALS AND METHODS
In the view of the current review, the introductory classical text of Ayurveda like Charak Samhita and compilation textbooks have been studied for the concept of pranvahasrotas, diseases caused by its vitiation, and their treatment protocol along with various formulations indicated for it. Some research publication and internet sources are also reviewed to explore the relation of Pranavaha srotas and COVID-19 disease.

RESULTS
Coronaviruses cause diseases of the respiratory and central nervous system in lots of species of animals, including humans (Weiss and Navas-Martin, 2005). In diseases, Pranavaha srotas of the primary respiratory system is affected. Pranavaha srotas gets vitiated because of various reasons like Raja (dust particles which are visible or may not be visible, containing viruses), Dhuma (smoke containing air pollutants) shitasthana (cold environment). This Raja when enters through mouth and nose develops disease like Shwas (Breathing problems like cough or throat irritation), Kasa( cough), Hikka (hiccups), Pratishaya (Running or stuffy nose) which are similar to coronavirus. Pranavata, situated in the head, also functions in the chest and throat. It controls or maintains Buddhi(intellect), Hrudaya (heart), Indriya (sensory organs) and Chitta  (Babu, 2017;Bhangare and Lahange, 2017).

DISCUSSION
Ayurveda can be stated as a complementary system of healing and encompasses various techniques for assessing health. It not only focuses on illness but also maintains all life cycle which supported by the energy instability (Verhoef et al., 2005). The channel of circulation in the body describes in Ayurveda in terms of Srotas. They are the structure or channel through which the process like moving, lowing, oozing, and penetration of various nutrients and components of the body takes place. Pranavaha srotas is the transport system of Prana which has been stated as vital energy of the body responsible for each activity of living being and also as vital air inhaled in the body. By the process of diffusion, the exchange of respiratory gases between lungs and blood takes place across the alveolar and capillary wall, and this process can be correlated with one of the physiological function of Pranavaha srotas.
The symptoms of diseases of the respiratory system can also be correlated with most of the symptoms explained in the vitiated Pranavaha srotas. Hence, the concept of Pranavaha srotas can also be implicit in the light of these facts. Hridaya(Heart) and Mahasrotas(Gastro-intestinal tract) are Moolsthana of Pranavaha srotas. Moolasthana(Origin) is the place from where it is being distributed and regulated. The novel Coronavirus is the pathogens that primarily target the respiratory system of human beings. The symptoms at the onset of COVID-19 disease are fever, cough, muscle pain. At the same time, in severe cases diarrhoea, haemoptysis sputum production, headache, dyspnoea, lymphopenia, and moderate to severe pneumonia, Respiratory Distress Syndrome are found (Cascella et al., 2020). In the diseases of Pranavaha srotas, similar symptoms are found as it is in connection with an organ like heart, lungs, brain and Gastro-intestinal tract. COVID-19 positive patients showed abnormal respiratory indings, increased levels of plasma proin lammatory cytokines and higher leukocyte numbers (Rothan and Byrareddy, 2020).
In the classics of Ayurveda, it is mentioned that the line of treatment for diseases of Pranvahahasrotas should be done like Shwas Vyadhi treatment. The Shwas vyadhi signi icant symptoms can be correlated with Asthma and Dyspnoea as the causes and symptoms of Pranvahasrotas vyadhis can be correlated with the COVID-19. Then the line of treatment which used treat diseases of Pranvahahasrotas in Ayurveda can also be to apply to the patient of COVID-19 disease. Ayurveda views diseases like COVID-19 as an assault on the immune system (ojas) and the respiratory system Pranavaha srotas). Therefore the line of treatment mentioned for treating diseases of Pranavaha srotas focuses on boosting immunity by Rasayan therapy and also the other systemic treatment of body puri ication, speci ic treatment process mentioned may enhance the capacity of the respiratory system.
The formulation mentioned for treating diseases of Pranavaha srotas includes herbs, calcined metals, a mineral which act mainly on the immune system and the respiratory system of the body. In the current review, classical text like Charak Samhita is used because it is basic texts of Ayurveda science which is known for Chikitsa(treatment) and also some compilation textbooks also referred for the review. The classical formulation mentioned should be used with proper classical dose and Anupan(adjuvant) for its ef icacy. Currently, there is no vaccine and precise antiviral treatment available for COVID-19. So this review will be useful for research and pharmaceutical manufacturing as well as standardization of classical formulations mentioned for the treating diseases of Pranavaha srotas.

CONCLUSION
Pandemic disease COVID-19 emerge as a global threat to human beings. At present, there is no de inite antiviral treatment, and a vaccine is available for COVID-19. In Ayurveda, there is a detailed description of causation and management of epidemic diseases mentioned in terms of Janapadodhwamsa. Hence, this life science becomes a ray of hope to battle diseases like COVID-19. The COVID -19 shows most common symptoms like dry cough fever and shortness of breath. In the current review, an attempt has been made to correlate COVID-19 with Pranvahahasrotas mentioned in Ayurveda as there is a similarity between causes and symptoms of diseases of Pranvahasrotas and the COVID-19. Thus the line of treatment which used treat diseases of Pranvahahasrotas can also be to apply in the cases of COVID-19 disease. The treatment protocols for diseases of Pranvahahasrotas includes general Snehan Karma(Oleation), Swedan Karma (Sudation) therapies, Vamana(emesis), Dhumapana (medicated smoking) therapy, Rasayan therapy(Rejuvenation Therapy), treatment of Jwar(fever) and classical formulations like Kantakari ghrita, Shrungyadi Churna, Talisadi churna, Vasa Avaleha, Kanakasava, Shwasakuthar Rasa, Mahalaxmivilas rasa etc. are recommended. So the current review will be useful for researches on treatment protocol mentioned for the management of diseases of Pranavaha srotas given COVID 19 and also as a reference for additional safety and ef icacy studies; pharmaceutical manufacturing as well as standardization of classical formulations stated for the treating diseases of Pranavaha srotas.