Chemotherapy

Some of the chemotherapy drugs are involved in damaging the cell at the time of splitting while others do their jobs when the gene copies are being made by the cell prior to division. The cells that are in resting phase are very less likely to get damaged. Different kind of drugs damage the cells at different stages and hence a combination of various drugs will increase the chance of damaging more number of cancer cells.

Chemotherapy drugs can be given in a variety of ways. At times due to the destructive nature of stomach enzymes, some of the drugs are impossible to administer as pills. While for other drugs the effects are better realized when administered intravenously. Some of them can be injected into muscles while other can be given directly to the abdominal cavity and bladder directly.

Ways to administer Chemotherapy Medications 

Oral chemo medications:

They are administered orally and are available in various forms such as liquids, tablets, capsules, and pill. All these forms can be absorbed by the stomach or under the tongue. The protective coating around them is broken down by digestive juices of the stomach and then the medication is directly absorbed by the lining of the stomach. There are some which have a certain amount of time delay between the administration and the actual release of the medicine.

Subcutaneous injection:

With the help of a short needle, the drug is administered into the region between the muscle and skin but it does not penetrate as far as the layer of muscles. They are used for some biologic response modifiers and support drugs of chemotherapy. If the platelet count of the patient is low, then it is less likely that such injections can cause any bleeding more than that in case if it was an intra muscular injection.

Intramuscular chemo injections:

In this case, the injection penetrates the muscle layer and a large needle has to be used for this so that the medication gets deposited in the tissues of the muscle. Most chemotherapy cannot be implemented via intramuscular injection owing to its harshness. People with low platelet counts are not advised with this due to the possibility of bleeding within the muscle.

Intravenous chemo treatments:

This also gets absorbed rapidly in the circulation system in the body. It offers more flexibility, thus making it more common. Continuous infusions are ensured through this method for days and weeks if required. Some of the types of intravenous infusions include the following:

• Angiocatheter:  A line is established in the arm or hand and infusions can be continued for few minutes to few days.
• PICC line:  It is considered temporary but the stretch can continue for 6 weeks to a few months. The long plastic catheter is placed in one of the larger veins of the arm. It can be done by fixing it with a portable pump even at home.
• Non-tunnelled catheters:  Through the skin, the sub clavian or the jugular vein is accessed and the line goes through the superior vena cava to the right atrium of the heart. They are used as short-term option during emergencies. Careful maintenance and regular dressing change are required in these cases.
• Tunneled catheters:  This catheter goes through the middle of the chest, going past the subcutaneous tissue reaching the superior vena cava vessel entering the right atrium of the heart. They can be even left for years with little chances of infection. They can have multiple lumens for infusions and good for extensive therapy like the bone marrow transplant procedure.
• Port-a-cath:  Chemo port or Port-a-cath act as a permanent option. It is usually placed by a surgeon or a radiologist. The lifetime of this can vary from three to five years. Dressing changes are not required but maintenance may be required for this at home.

Intraventricular chemo treatments:

In this procedure, the drugs are meant to reach the cerebrospinal fluid. The blood-brain barrier stops many drugs to reach it and hence in two ways it can be done; one is the lumbar puncture and the other is Ommaya reservoir. A dome-shaped device with a catheter attached is placed in the subcutaneous layer on the scalp. It is threaded to the lateral ventricle of the brain. A small needle is placed through the ommaya reservoir to inject drugs. This is good for chemotherapy for leukemia.

Intraperitoneal chemo treatment:

In this case, the drug can be directly drained into the abdominal cavity, the general cavity surrounding the organs. The organs, as a result, get bathed in the medication before it gets absorbed into the tumor site.

Intra arterial chemo treatments:

Here the drug is given directly to the artery supplying blood to a tumor. This kind of treatment is beneficial for colon cancer, limb melanoma, pancreatic cancer, gastric cancer, and some other forms of cancer.

Intravesicular chemo treatments:

A urinary catheter is used to access the urinary bladder and useful for people suffering from superficially invasive bladder cancer.

Intrapleural chemo treatments:

This is the chemotherapy for lung cancer where the drug is administered in the pleural cavity to control malignant pleural effusions and used for symptom relief.

Implantable chemotherapy treatment:

A gliadel wafer can be placed in the cavity after removal of tumor in the brain. It can be left for 2 or 3 weeks to ensure that all cancer cells are finally killed in the area surrounding the brain tumor site.

Topical chemo treatments:

In this case, a cream is applied to the skin and used to treat cancerous lesions on the skin itself. Not used very commonly but used for treating skin cancer.

• For patients who can tolerate a high dose of drugs, chemotherapy cycle is carried out in a single go after every three weeks.
• For patients who are not expected to tolerate a high dose of drugs, the same cycle is split into two or three light doses, which are administered at an interval of a week.
• The platelet and white blood cells count may drop after each cycle of chemotherapy, which usually recovers on its own if proper diet is maintained. Some patients may experience loss of appetite. It is important for them and all other patients to take plenty of fluids and plain water to recover after chemotherapy. This will reduce fatigue, weakness, and joint pain while restoring the platelet and WBC count.
• Patients are advised to take the emergency medicine prescribed by the doctor in case they experience pain, vomiting, nausea, or general sickness. Inform the specialist immediately in case of any adverse reactions.