Brain Tumors - Part 4 Notes
Target Cells: Radiation therapy and chemotherapy target cells with high mitotic division rates, meaning cells that rapidly divide. This is because these therapies work by damaging the DNA of rapidly dividing cells, preventing them from multiplying. However, this also means that healthy cells with high turnover rates are also affected.
Examples: Epithelial cells (lining of organs and skin), hair follicles (resulting in hair loss), gastrointestinal tract lining (leading to GI issues).
Systems Affected: Bone marrow (responsible for producing blood cells) and the gastrointestinal (GI) tract are primary concerns due to their high rate of cell division.
Impact on Bone Marrow
Red Blood Cells: Disruption leads to anemia, a condition characterized by a deficiency of red blood cells or hemoglobin in the blood, resulting in reduced oxygen transport. This causes fatigue.
Fatigue is a common complaint among cancer patients, including those with brain tumors, significantly impacting their quality of life. It can affect their ability to perform daily activities and participate in rehabilitation programs.
Anemia impacts physical activity; adjust activity levels based on hematocrit and hemoglobin levels, which are measures of red blood cell volume and oxygen-carrying capacity, respectively. Close monitoring is essential to prevent overexertion and ensure patient safety.
Reference guides are available for exercise recommendations based on lab values, providing specific guidelines for safe and effective exercise prescription based on individual blood counts.
White Blood Cells: Reduction (neutropenia) increases risk of infection because white blood cells, particularly neutrophils, are crucial for fighting off infections. A decrease in these cells weakens the immune system.
This is compounded by potential prior craniotomy, a surgical procedure to remove part of the skull to access the brain, which also increases infection risk due to the disruption of the protective barrier and potential introduction of pathogens.
Platelets: Depletion leads to thrombocytopenia, a condition characterized by a low platelet count, and increased bleeding risk. Platelets are essential for blood clotting, so a deficiency increases the risk of bleeding and bruising.
Consult medical team/records to determine appropriate physical activity based on platelet count to avoid activities that could cause injury or bleeding.
Understand platelet count ranges for different exercise intensities (resistance training, which may be contraindicated with very low counts, vs. low-level aerobic training, which is generally safer).
Relate to hemodynamic stability and adequate cardiac output, ensuring the cardiovascular system can handle the demands of physical activity without causing further complications.
Impact on GI Tract
Effects: Chemotherapy affects the lining of the mouth (mucositis), esophagus (esophagitis), and intestines (enteritis), causing inflammation and irritation. This can lead to painful sores and difficulty swallowing.
Poor Nutrition: Leads to insufficient caloric intake, further contributing to fatigue, muscle wasting, and overall weakness. Malnutrition can impair the body's ability to repair tissues and fight off infections.
Symptoms: Nausea, vomiting, irregular bowel movements (diarrhea or constipation) are common side effects that can significantly impact a patient's comfort and ability to eat and drink.
Overall Effect: Patients feel tired, have poor nutrition, and experience GI distress, all of which can negatively impact their ability to participate in and benefit from physical therapy.
Clinical Implications
Patient Condition: Patients undergoing these treatments may lack motivation for intensive physical therapy due to fatigue, pain, and overall discomfort. They may also experience anxiety and depression, which can further affect their participation.
Clinician Approach: Requires empathy, flexibility, and the ability to modify treatment plans to meet changing patient needs. It is crucial to build a strong therapeutic relationship with the patient and provide emotional support.
Considerations: Clinicians must understand and work through the complications that arise during treatment, including managing side effects, adjusting exercise intensity, and collaborating with the medical team to ensure patient safety and well-being.
Treatment Approaches for Brain Tumors
Four main approaches: preventative, restorative, supportive, and palliative care, each tailored to the patient's specific needs and prognosis.
Preventative Approach
Focus: Education and early intervention to slow the effects of the tumor and prevent functional loss, aiming to maintain the patient's current level of function and independence for as long as possible.
Action: A "watch-and-wait" approach, involving close monitoring of the tumor and the patient's condition without immediate intervention.
Example: Elderly patient with a slow-growing benign tumor affecting the eighth cranial nerve (hearing loss, balance issues) where the risks of intervention may outweigh the benefits.
Physical Therapy: Targeted balance training to improve stability and reduce the risk of falls, fall prevention strategies to create a safe environment, adaptive equipment assessment to provide assistive devices that enhance independence, and functional strength training to maintain muscle strength and endurance.
Medical Management: Regular imaging (MRI, CT scans) and assessment of risks associated with surgery, radiation, or chemotherapy. The decision to proceed with these treatments is carefully weighed against the potential side effects and the patient's overall health.
Risk of therapies may outweigh benefits in some cases, particularly in elderly or frail patients with slow-growing tumors.
Restorative Approach
Application: For patients with mild to moderate functional deficits who are medically stable and have a good prognosis for recovery, this approach aims to restore lost function and improve overall independence.
Similar to stroke or TBI rehabilitation, utilizing principles of neuroplasticity to promote recovery.
Method: High-intensity, task-specific practice, focusing on repetitive practice of functional tasks to improve motor skills and coordination.
Goal: Restitution of function to improve independence in everyday activities, such as walking, dressing, and eating.
Ideally, patients return to pre-diagnosis functional levels, allowing them to resume their previous lifestyle and activities.
Tumor Types: Primarily benign tumors and low-grade gliomas (grade 1 and 2), which tend to grow slowly and have a lower risk of recurrence.
Favorable prognosis for survival and return to independence, with many patients able to return to work and other meaningful activities.
Supportive Approach
Emphasis: Improving independence for basic ADLs, such as bathing, dressing, and toileting, to enhance the patient's quality of life and reduce the burden on caregivers.
Patient Group: High-grade gliomas and metastatic brain tumors, which are associated with a poor prognosis, typically less than one year.
Clinician Focus: Discussions with family about their needs and equipment to decrease the burden of care and improve patient quality of life. This includes providing education, emotional support, and practical advice to help families cope with the challenges of caring for a loved one with a brain tumor.
Rehabilitation: Task-specific practice to improve functional independence is still important but is often adapted to the patient's current abilities and limitations.
Palliative Approach
Goal: Provide comfort, relieve symptoms, preserve independence as long as possible, and support the patient, care partner, and family. The focus is on maximizing quality of life and minimizing suffering.
Concentration: Maximizing quality of life by addressing physical, emotional, and spiritual needs. This may involve pain management, symptom control, and emotional support.
Care Plan: Education directed towards the care partner, providing them with the knowledge and skills to provide safe and effective care at home.
Interventions: Adaptive equipment to maximize patient quality of life and minimize the care partner's burden, such as wheelchairs, walkers, and bathing aids.
Thought Experiment: Inpatient Rehabilitation Center
Role: As a physical therapist, you recommend the patient's length of stay as part of an interdisciplinary team, considering various factors to determine the most appropriate level of care.
Factors: Prior living situation, family support, discharge destination, current functional status, prognosis for survival, and the chosen care approach all influence the length of stay recommendation.
Length of Stay Categories:
5-7 Days: For patients with palliative care needs and a supportive care partner or family who can be trained to manage basic ADLs. Goal is to ensure patient safety at home and provide the necessary support for end-of-life care.
Up to 2 Weeks: For individuals with primary benign tumors or low-grade gliomas with a favorable prognosis for return to independence, including work. Focus on achieving independence with basic ADLs and instrumental ADLs (IADLs), such as cooking and cleaning.
21-28 Days: For individuals with high-grade gliomas or metastatic brain tumors undergoing full medical treatment (not palliative). The aim is to maximize independence with basic mobility and ADLs, enabling them to return home with some degree of independence and improved quality of life.
Special Considerations
Frequent Reassessment: Continuously assess the patient's clinical presentation and functional status for changes, as their condition can fluctuate rapidly. Regular monitoring is crucial to detect and manage any complications.
Fluctuations may be due to medication side effects or more serious complications like intracranial bleeds or infections. Prompt identification and treatment are essential to prevent further neurological damage.
Distinguish between general malaise and concerning symptoms like lethargy, confusion, or difficulty following directions. These symptoms may indicate a more serious underlying problem that requires immediate medical attention.
Action: Notify the medical team of any changes in neurologic or functional status due to the risk of emergent complications. Early communication and collaboration are essential for optimal patient care.
Goal: Maintain or improve the patient's quality of life by addressing their physical, emotional, and social needs. This may involve pain management, symptom control, and emotional support.
Approaches:
Compensatory: Teach movement strategies or incorporate equipment to improve independence without prioritizing restoration of function. This approach focuses on adapting to the patient's limitations and maximizing their current abilities.
Restorative: Implement task-specific, intensive rehabilitation to restore function for full recovery. This approach aims to improve motor skills, coordination, and overall functional abilities.
Adaptive equipment: Consider renting rather than purchasing equipment, especially for palliative care, given potential limited use. This can save costs and avoid unnecessary equipment clutter in the home.
Physical Activity: Any type of activity (strength training, low to moderate exercise, aerobic exercise) can improve cancer-related fatigue and overall well-being. Exercise can help to boost energy levels, improve mood, and enhance physical function.
Intervention Studies
Study 1: 132 patients with primary malignant, primary benign, and metastatic brain tumors participated in a comprehensive rehabilitation program.
Primary Outcome: Change in overall Functional Independence Measure (FIM) score, a standardized assessment of functional abilities in areas such as self-care, mobility, and communication.
Results: Improvements in functional mobility and ADL performance across all populations, with meningioma showing the largest change. This suggests that rehabilitation can be beneficial for patients with various types of brain tumors.
Even individuals with metastatic brain tumors showed positive changes, highlighting the potential for rehabilitation to improve quality of life even in advanced stages of the disease.
Discharge Destination: Only about 50% discharged home; nearly half to long-term institutionalized care. This indicates the significant challenges faced by many patients in returning to independent living.
Length of stay ranged from about one week (palliative) to about four weeks (supportive), reflecting the varying needs of patients with different levels of functional impairment and prognoses.
Study 2: Compared 21 patients with low-grade gliomas to 21 matched patients with high-grade gliomas to assess the impact of tumor grade on rehabilitation outcomes.
Results: No statistically significant difference in change in FIM scores between the groups, suggesting that rehabilitation can be equally effective for patients with both low-grade and high-grade gliomas.
Individuals with high-grade gliomas showed slightly greater improvement in the cognitive domain, indicating the potential for rehabilitation to address cognitive deficits associated with these tumors.
Similar improvements across all domains measured by the FIM score, further supporting the benefits of rehabilitation for patients with brain tumors.
Length of Stay: Longer for individuals with high-grade gliomas, likely due to the more complex medical and functional challenges associated with these tumors.
Tumor Classification and Prognosis
The type of tumor has the greatest impact on prognosis and should guide the direction and length of the physical therapy plan of care. Understanding the specific characteristics of the tumor is crucial for developing an individualized treatment plan that maximizes the patient's potential for recovery and improved quality of life.