CF Companion

What is Cystic Fibrosis?

Cystic fibrosis (CF) is a serious genetic disorder that primarily affects the lungs and digestive system. It is caused by mutations in the CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) gene, which controls the movement of salt and water in and out of cells. When the CFTR protein doesn't work properly, the body produces abnormally thick, sticky mucus that clogs the airways, traps bacteria, and blocks the pancreatic ducts.

How is CF Inherited?

Cystic fibrosis follows an autosomal recessive inheritance pattern. A child must inherit two defective copies of the CFTR gene — one from each parent — to develop CF. If a child inherits only one defective copy, they become a carrier who does not have the disease but can pass the gene to their children.

• Both parents are carriers: 25% chance child has CF, 50% chance child is a carrier, 25% unaffected
• One parent is a carrier: 0% chance child has CF, 50% chance child is a carrier
• Approximately 1 in 25 people of European descent are CF carriers

How Common is CF?

Cystic fibrosis affects approximately 1 in 2,500 to 3,500 newborns of European descent. It occurs in all ethnic groups but is most common in Caucasian populations. There are approximately 100,000 people living with CF worldwide, including about 40,000 in the United States and 50,000 in Europe.

Diagnosis

Most CF cases are now detected through newborn screening (NBS), which is routine in many countries. When screening suggests CF, a sweat chloride test is performed — the gold standard for CF diagnosis. A chloride level above 60 mmol/L confirms CF. Genetic testing identifies the specific CFTR mutations, which is important for determining eligibility for targeted therapies like CFTR modulators.

Life Expectancy

Life expectancy has improved dramatically. In the 1950s, most children with CF did not survive to elementary school. Today, thanks to CFTR modulators like Trikafta, the median predicted survival age has risen to the mid-to-late 50s, with many patients living even longer. Babies born today with CF are expected to have significantly better outcomes than any previous generation.

CFTR Mutations & Classes

The CFTR gene contains instructions for making the CFTR protein, which acts as a chloride channel on cell surfaces. Over 2,000 different mutations have been identified, categorized into six classes based on how they disrupt the protein.

The Six Classes of CFTR Mutations

• Class I — No protein production: The cell cannot make any CFTR protein. Example: G542X (a stop mutation). Among the most severe.
• Class II — Protein misfolding: The protein is made but folds incorrectly and gets destroyed before reaching the cell surface. F508del — the most common CF mutation (~70% of patients) — belongs to this class.
• Class III — Gating defect: The protein reaches the cell surface but the channel doesn't open properly. Example: G551D. Responds well to ivacaftor (Kalydeco).
• Class IV — Conductance defect: The channel opens but chloride doesn't flow efficiently. Example: R117H. Often milder disease.
• Class V — Reduced quantity: Less CFTR protein is produced than normal, though what is made works correctly.
• Class VI — Instability: The protein works normally but is unstable at the cell surface and breaks down too quickly.

Common CFTR Mutations

• F508del (ΔF508): Present in ~70% of CF alleles worldwide. Class II. Eligible for Trikafta/Kaftrio.
• G542X: Class I nonsense mutation common in Mediterranean populations.
• G551D: Class III gating mutation. First targeted by a CFTR modulator (ivacaftor/Kalydeco).
• N1303K: Class II mutation common in some European populations.
• W1282X: Common in Ashkenazi Jewish populations.

Modulator Eligibility

Knowing your specific CFTR mutations is critical for CFTR modulator therapy eligibility. Trikafta (elexacaftor/tezacaftor/ivacaftor) is approved for patients aged 2+ with at least one F508del mutation, covering roughly 90% of the CF population.

Treatments & Medications for Cystic Fibrosis

CF treatment involves a comprehensive daily regimen aimed at keeping the lungs clear, fighting infections, maintaining nutrition, and addressing the underlying CFTR protein defect.

CFTR Modulators (Targeted Therapy)

CFTR modulators fix the underlying protein defect rather than just treating symptoms. They have transformed CF care since 2012.

• Trikafta / Kaftrio (elexacaftor + tezacaftor + ivacaftor): The most significant advance in CF treatment. Triple-combination for patients 2+ years with at least one F508del mutation (~90% of patients). Improves FEV1 by an average of 14 percentage points.
• Symdeko / Symkevi (tezacaftor + ivacaftor): Dual-combination for specific mutations.
• Orkambi (lumacaftor + ivacaftor): For patients homozygous for F508del.
• Kalydeco (ivacaftor alone): For specific gating mutations including G551D.

Nebulized Medications

• Dornase alfa (Pulmozyme): Breaks down DNA in mucus, making it thinner. Typically used once daily before airway clearance.
• Hypertonic saline (3% or 7%): Draws water into airways, hydrating mucus for easier clearance.
• Tobramycin (TOBI): Inhaled antibiotic on alternating monthly cycles for chronic Pseudomonas aeruginosa.
• Aztreonam (Cayston): Another inhaled antibiotic for chronic Pseudomonas.
• Colistin (Colistimethate): Inhaled antibiotic used in some countries for Pseudomonas.

Oral & IV Antibiotics

Oral antibiotics like azithromycin are often taken long-term for anti-inflammatory properties. During pulmonary exacerbations, patients may need IV antibiotics, sometimes requiring 2-3 weeks of hospitalization.

Vitamins & Supplements

• Vitamins A, D, E, and K — taken daily as CF-specific multivitamins (e.g., AquADEKs, DEKAs, SourceCF)
• Salt supplementation — CF patients lose excessive salt through sweat, especially in hot weather or during exercise

Enzyme Pills Explained — Pancreatic Enzyme Replacement Therapy (PERT)

About 85-90% of CF patients are pancreatic insufficient (PI), meaning the pancreas cannot produce enough digestive enzymes. Thick mucus blocks pancreatic ducts, preventing enzymes from reaching the small intestine.

How Enzyme Replacement Works

PERT provides three key digestive enzymes: lipase (digests fats), protease (digests proteins), and amylase (digests carbohydrates). The capsules contain acid-resistant microspheres that dissolve in the small intestine.

Common Enzyme Brands

• Creon — Most widely prescribed worldwide. Available in 3,000 to 40,000 lipase units.
• Zenpep — Available in 3,000 to 40,000 lipase units.
• Pertzye — Contains an additional bicarbonate component.
• Pancreaze — Another FDA-approved PERT option.
• Viokace — Uncoated preparation, typically used with a proton pump inhibitor.

Dosing & Timing

Enzymes must be taken immediately before eating — ideally within 15 minutes of starting a meal.

• Dose based on lipase units per kilogram of body weight per meal
• Typical starting dose: 500–1,000 lipase units/kg per meal (children), 500 units/kg (adults)
• Maximum: 2,500 lipase units/kg per meal or 10,000 units/kg per day
• Snack doses are usually half the meal dose
• Capsules should be swallowed whole — never crushed or chewed
• For infants: capsules can be opened and microspheres sprinkled on acidic soft food (like applesauce)

Nutrition & Digestion in Cystic Fibrosis

Nutrition is one of the most critical aspects of CF care. Good nutritional status is directly linked to better lung function, fewer infections, and improved quality of life.

Why CF Patients Need More Calories

People with CF typically need 120-150% of normal calorie intake — often 3,000+ calories per day for adults — because:

• Malabsorption: Even with enzymes, not all nutrients are fully absorbed
• Increased work of breathing: Clogged airways require more energy
• Chronic inflammation: Fighting infections burns extra calories
• Higher metabolic rate: The CFTR defect increases baseline energy needs

The CF Diet: High-Fat, High-Calorie

Guidelines recommend 35-40% of calories from fat. Strategies include adding butter, cream, cheese, and oils to meals; choosing full-fat dairy; eating energy-dense snacks (nuts, avocado, nut butters); using nutritional supplements; and eating 3 meals plus 2-3 snacks daily.

Fat-Soluble Vitamins

• Vitamin A: Essential for vision, immune function, and cell growth
• Vitamin D: Critical for bone health — CF patients are at high risk for osteoporosis
• Vitamin E: An antioxidant that protects cells from damage
• Vitamin K: Necessary for blood clotting and bone metabolism

CF-Related Diabetes (CFRD)

CFRD affects about 40-50% of CF adults, caused by scarring of the pancreas's insulin-producing cells. Annual screening with an oral glucose tolerance test (OGTT) is recommended from age 10. CFRD is managed with insulin — patients should not restrict calories.

Understanding Lung Function in Cystic Fibrosis

Lung function testing is one of the most important tools for monitoring CF disease progression and treatment effectiveness.

Key Measurements

• FEV1 (Forced Expiratory Volume in 1 second): The most important CF lung function measure — the amount of air forcefully blown out in the first second. Expressed as percentage of predicted values based on age, height, sex, and ethnicity.
• FVC (Forced Vital Capacity): Total air you can blow out after the deepest possible breath.
• FEV1/FVC ratio: Helps distinguish obstructive vs. restrictive patterns. Often reduced in CF.

What Do the Numbers Mean?

• 80-120% predicted: Normal lung function
• 70-79%: Mild obstruction
• 60-69%: Moderate obstruction
• 50-59%: Moderately severe
• 35-49%: Severe obstruction
• Below 35%: Very severe obstruction

Baseline & Tracking Trends

Your personal best FEV1 is your baseline. The trend over time matters most — a gradual decline may indicate progression, while an acute drop might signal an exacerbation. Regular testing (typically every 3 months) catches changes early.

Home Spirometry

Home spirometry devices allow monitoring between clinic visits. Many CF centers now recommend weekly or daily home spirometry for certain patients.

Vital Signs: SpO2, Heart Rate & Temperature

Monitoring vital signs is essential for daily CF care. Changes can be early warning signs of infection, exacerbation, or complications.

Oxygen Saturation (SpO2)

SpO2 measures the percentage of hemoglobin carrying oxygen, measured with a pulse oximeter.

• Normal: 95-100%
• Mild concern: 92-94% — discuss with your care team
• Requires attention: Below 92% — may need supplemental oxygen
• Emergency: Below 88% — seek immediate medical attention

Heart Rate

• Normal resting (adults): 60-100 bpm
• Children: Higher resting rates are normal, varies by age
• Persistently elevated rate may indicate the body is under stress

Temperature

• Normal: 36.1–37.2°C (97–99°F)
• Low-grade fever: 37.3–38°C (99.1–100.4°F)
• Fever: Above 38°C (100.4°F) — contact your CF team

Symptoms & Monitoring in Cystic Fibrosis

Regular symptom monitoring helps detect exacerbations early, track disease progression, and assess treatment effectiveness.

Common CF Symptoms

• Cough: The hallmark symptom. Changes in frequency, intensity, or character can signal exacerbation.
• Sputum (mucus): Color matters — yellow, green, or brown may indicate infection. Increased volume is a warning sign.
• Breathlessness: Difficulty during previously easy activities may indicate worsening lung function.
• Fatigue: Persistent tiredness can signal infection, inadequate nutrition, or disease progression.
• Appetite changes: Decreased appetite is often an early sign of pulmonary exacerbation.

The 0-3 Symptom Scoring Scale

CF Companion uses a simple 0-3 scale for daily logging:

• 0 — None: No symptoms
• 1 — Mild: Present but not interfering with activities
• 2 — Moderate: Affecting daily activities or comfort
• 3 — Severe: Significantly impacting daily life

Recognizing a Pulmonary Exacerbation

Warning signs include: increased cough, more or darker sputum, increased breathlessness, fatigue, decreased appetite, weight loss, fever, and declining FEV1.

Airway Clearance Techniques

Airway clearance therapy (ACT) is a cornerstone of daily CF care. Most patients perform airway clearance at least twice daily to loosen, mobilize, and remove thick mucus.

PEP Therapy (Positive Expiratory Pressure)

PEP devices create back pressure during exhalation, keeping airways open and moving mucus toward larger airways. Examples: Pari PEP, TheraPEP. Typical session: 10-15 breaths followed by huff coughing, repeated for 15-20 minutes.

Oscillating PEP / Flutter Devices

Combine PEP with vibrations that shake mucus loose. Popular devices: Aerobika, Flutter valve, Acapella.

HFCWO / Vest Therapy

High-Frequency Chest Wall Oscillation — an inflatable vest that rapidly vibrates the chest wall. Brands: The Vest (Hill-Rom), SmartVest, InCourage. Sessions: 20-30 minutes at various frequencies with pauses for coughing.

Autogenic Drainage (AD)

A breathing technique using controlled breathing at different lung volumes to move mucus from small to large airways. Effective, portable, requires no equipment.

Active Cycle of Breathing Technique (ACBT)

Combines breathing control (gentle, relaxed breathing), thoracic expansion exercises (deep breaths with holds), and forced expiration/huffing. Effective, free, and can be done anywhere.

Huff Coughing

A forced exhalation with an open glottis — like fogging a mirror but more forceful. More effective than regular coughing for clearing CF mucus.

Weight & Growth in Cystic Fibrosis

Maintaining healthy weight is crucial because nutritional status is directly linked to lung function. Better BMI correlates with better FEV1, fewer infections, and longer life expectancy.

BMI Targets for CF

• Adults: BMI of 22 kg/m² for women and 23 kg/m² for men (minimum targets)
• Children (2-20): 50th percentile or above for BMI-for-age
• Infants: Should follow normal growth curves for weight-for-length

Why Weight Matters

Weight loss or poor gain may signal inadequate calories, malabsorption (enzyme dose may need adjusting), infection, CFRD, or increased disease activity. Even small drops should be investigated.

Monitoring Tips

• Weigh at the same time of day (morning before eating) for consistency
• Weekly weigh-ins are more useful than daily
• Track trends over weeks and months
• Bring weight records to every clinic visit

Treatment Adherence in Cystic Fibrosis

The typical CF daily routine takes 2-4 hours including nebulized medications, airway clearance, enzymes, vitamins, exercise, and CFTR modulators. Consistent adherence is one of the most impactful factors for long-term outcomes.

Why Adherence Matters

Even modest improvements lead to measurably better lung function, fewer hospitalizations, fewer exacerbations, better nutrition, and improved quality of life.

Common Barriers

• Time burden: The daily routine is long and repetitive
• Treatment fatigue: Motivation wanes after years of the same routine
• Feeling well: Especially on modulators, it's tempting to skip treatments
• Social situations: Treatments can feel embarrassing or inconvenient
• Mental health: Depression and anxiety reduce motivation

Tips for Consistency

• Anchor to habits: Link treatments to meals, brushing teeth, or other daily activities
• Multitask: Watch shows or listen to podcasts during vest or nebulizer sessions
• Streak tracking: CF Companion's streak feature shows consecutive completion days
• Celebrate milestones: Acknowledge weekly and monthly achievements
• Be honest with your team: They can help adjust the routine if needed

Exercise & Physical Activity for CF Patients

Regular exercise is essential — it helps clear mucus, improves lung function, builds cardiovascular fitness, strengthens bones, improves mood, and enhances quality of life.

Benefits of Exercise in CF

• Airway clearance: Exercise naturally mobilizes mucus
• Improved FEV1: Regular exercise slows lung function decline
• Appetite stimulation: Helps meet high calorie needs
• Bone health: Weight-bearing exercise combats CF-related bone loss
• Mental wellbeing: Endorphins reduce anxiety and depression

Recommended Activities

Swimming (humidity helps airways), cycling, walking, hiking, yoga (improves breathing control), team sports, and strength training. The best exercise is one you enjoy and will do consistently.

Important Precautions

• Stay hydrated: CF patients lose more salt through sweat. Use electrolyte drinks.
• Replace salt: Add extra salt before and after exercise, especially in warm weather
• Monitor SpO2: Increase supplemental oxygen flow if applicable
• Warm up and cool down: Always start gently and finish with breathing exercises
• Listen to your body: Reduce intensity during exacerbations

Mental Health and Cystic Fibrosis

Anxiety and depression are 2-3 times more common in CF patients and caregivers compared to the general population. Mental health is an essential component of comprehensive CF care.

CF Burnout

Emotional, mental, and physical exhaustion from relentless CF care demands. Signs: feeling overwhelmed, skipping treatments, emotional numbness, social withdrawal, irritability. Burnout is not a personal failure — it's a natural response to extraordinary demands.

Anxiety in CF

Common triggers: worry about lung function decline, fear of hospitalizations, health uncertainty, social anxiety about coughing in public, body image concerns, and future uncertainty.

Depression

Can be triggered by health setbacks, isolation (the 6-foot rule limits CF-to-CF contact), chronic discomfort, loss of independence, and grief over health milestones.

Caregiver Fatigue

Parents and caregivers face their own challenges — constant vigilance, treatment management, and emotional weight can lead to burnout. Caregivers need support too.

When to Seek Help

The CF Foundation recommends annual mental health screening for patients aged 12+ and all caregivers. Seek help if symptoms persist over two weeks, interfere with daily functioning, affect treatment adherence, or include thoughts of self-harm.

Infection Control in Cystic Fibrosis

Infection control is critically important because CF lung mucus provides an ideal environment for bacteria that can cause serious chronic infections.

The 6-Foot Rule (2-Meter Rule)

CF patients must maintain at least 6 feet (2 meters) from other CF patients at all times. Bacteria like Pseudomonas aeruginosa and Burkholderia cepacia complex can spread between CF patients through respiratory droplets.

Key CF Pathogens

• Pseudomonas aeruginosa: Most common and significant CF pathogen. Early eradication is crucial.
• Staphylococcus aureus (incl. MRSA): Very common, especially in children.
• Burkholderia cepacia complex: Particularly dangerous. Highly transmissible between CF patients.
• Non-tuberculous mycobacteria (NTM): Including M. abscessus. Challenging to treat.
• Aspergillus fumigatus: Can cause allergic bronchopulmonary aspergillosis (ABPA).

Everyday Prevention

• Hand hygiene: Wash with soap for 20+ seconds, especially before and after treatments
• Nebulizer hygiene: Clean and sterilize all parts after every use
• Avoid sick contacts: Stay away from people with colds or flu
• Vaccinations: Annual flu shots and COVID boosters are critical
• Avoid stagnant water: Hot tubs and standing water can harbor Pseudomonas

Travel Tips for CF Patients

Travel is absolutely possible with CF — it just requires extra planning.

Flying with CF

Airplane cabins are pressurized to ~6,000-8,000 feet altitude with reduced oxygen. For most patients with FEV1 above 50%, this is manageable.

• FEV1 below 50%: discuss a hypoxic challenge test with your team before flying
• Stay well-hydrated — cabin air is very dry
• Walk the aisle periodically on long flights
• Carry all medications in carry-on luggage — never check essential medications

Medications Abroad

• Carry a letter from your CF team listing all medications (translated if possible)
• Bring enough medication plus extra for delays
• Know brand and generic names in the destination country
• Research the nearest CF center or hospital
• Check voltage compatibility for nebulizer compressors

Travel Insurance

Standard insurance often excludes pre-existing conditions. Look for policies covering CF-related emergencies. Always declare your diagnosis.

Altitude Effects

Above 2,500 meters (8,000 feet), CF patients may experience more breathlessness. Acclimatize gradually and monitor SpO2.

Family & Caregivers in CF Care

CF is a family affair. Behind every CF patient is a network of parents, siblings, partners, and caregivers whose lives are deeply affected.

Supporting a CF Patient

Encourage (not force) treatment adherence, respect the patient's autonomy — especially in teens and adults, educate yourself about CF, celebrate effort and consistency, and create a supportive environment without making CF the center of family life.

Caregiver Burnout

Warning signs: persistent exhaustion, resentment about duties, neglecting own health, social withdrawal, difficulty sleeping. To prevent: share responsibilities, maintain social connections, seek respite care, ask for professional support.

Sibling Support

Siblings may feel overlooked, anxious, or confused. Open, age-appropriate communication is key. Include siblings in CF education, acknowledge their feelings, and ensure dedicated family time.

Family Roles in CF Companion

Three user roles — Patient, Caregiver, and Family Member — allow families to collaborate on care while respecting boundaries. Caregivers log treatments for young patients, family members get read-only access, and patients own their data.

Cystic Fibrosis in Children

Thanks to newborn screening, most children are diagnosed within the first weeks of life. Early diagnosis and proactive treatment give today's CF children the best possible foundation.

Age-Appropriate Care

• Infants (0-1): Focus on nutrition (breast milk or high-calorie formula with enzymes), early airway clearance, and establishing CF center care.
• Toddlers (1-3): Structured treatment routines, make nebulizer time fun with videos or games, encourage physical play.
• School-age (4-11): Gradually increase involvement in own care. Coordinate with school for enzyme administration and accommodations.
• Adolescents (12-17): Shift toward self-management with oversight. Mental health screening is especially important.

School Considerations

• Develop a care plan with the school covering enzymes at meals, bathroom access, water, and snacks
• Ensure the school understands the 6-foot rule if another CF student attends
• Request accommodations for clinic visits or hospitalizations
• Physical education should be encouraged, not restricted

Transition to Adult Care

Typically occurs between ages 16 and 21. Involves building self-management skills, learning to communicate with providers independently, understanding insurance and medication access, and emotional preparation.

Useful CF Resources & Support Organizations

You are not alone. National foundations, research organizations, and support groups worldwide provide invaluable resources for patients and families.

CF Foundations by Country

• 🇺🇸 Cystic Fibrosis Foundation (CFF) — cff.org — Leading US organization
• 🇬🇧 Cystic Fibrosis Trust — cysticfibrosis.org.uk — UK's leading CF charity
• 🇩🇪 Mukoviszidose e.V. — muko.info — Germany
• 🇫🇷 Vaincre la Mucoviscidose — vaincrelamuco.org — France
• 🇦🇺 Cystic Fibrosis Australia — cysticfibrosis.org.au
• 🇨🇦 Cystic Fibrosis Canada — cysticfibrosis.ca
• 🇮🇪 Cystic Fibrosis Ireland — cfireland.ie
• 🇪🇺 CF Europe — cf-europe.eu — Pan-European
• 🇹🇷 Kistik Fibrozis Derneği — Turkey's CF patient association

Research & Clinical Trials

• ClinicalTrials.gov — clinicaltrials.gov — Search for active CF trials
• CFF Drug Development Pipeline — CFF Pipeline Tracker
• CFTR2 Project — cftr2.org — CFTR mutation database

Online Communities

Due to the 6-foot rule, online communities are vital for CF patients to connect. Look for CF communities on social media, dedicated forums, and virtual support groups organized by national foundations. Cross-infection rules don't apply to virtual meetups!