Mitral stenosis - Nursing Case Study
Pathophysiology
• Primary mechanism: Mitral stenosis occurs when the mitral valve, located between the left atrium and left ventricle, becomes narrowed, restricting blood flow from the atrium to the ventricle. This typically results from rheumatic fever, leading to thickening and fusion of the valve leaflets.
• Secondary mechanism: The narrowed valve causes increased pressure in the left atrium as it works harder to push blood into the left ventricle. This pressure backs up into the pulmonary circulation, leading to congestion and potential pulmonary hypertension.
• Key complication: The increased pressure and blood pooling in the left atrium can cause atrial enlargement and atrial fibrillation, which may lead to further complications like thrombus formation and increased risk of stroke.
Patient Profile
Demographics:
45-year-old female, school teacher
History:
• Key past medical history: Rheumatic fever at age 12
• Current medications: Low-dose aspirin, occasional use of acetaminophen for headaches
• Allergies: Penicillin
Current Presentation:
• Chief complaint: Mild shortness of breath during physical exertion
• Key symptoms: Occasional fatigue, mild palpitations, no chest pain
• Vital signs: Blood pressure 118/76 mmHg, heart rate 78 bpm, respiratory rate 16 breaths per minute, temperature 98.6°F
Section 1
Initial Assessment Findings:
Upon conducting an initial assessment, the nurse notes that the patient, a 45-year-old female school teacher, appears well-nourished and in no acute distress but reports feeling slightly winded after climbing a flight of stairs. During the physical examination, the nurse observes a normal jugular venous pressure and no peripheral edema. Auscultation of the heart reveals a low-pitched, rumbling diastolic murmur best heard at the apex with the patient in the left lateral decubitus position. There is also a subtle opening snap following the second heart sound, characteristic of mitral stenosis. Lung auscultation reveals clear breath sounds bilaterally, indicating no immediate pulmonary congestion.
The nurse conducts a respiratory assessment and notes that the patient's respiratory rate is 16 breaths per minute, with an oxygen saturation of 98% on room air, which is within the normal range. The patient confirms occasional episodes of fatigue and mild palpitations but denies any dizziness or syncope. The nurse observes that the patient maintains a steady gait and demonstrates no difficulty in ambulation during the short walk from the waiting area to the exam room. The nurse documents these findings and prepares to discuss them with the physician, recognizing the importance of monitoring the patient's symptoms and evaluating the need for further diagnostic testing to assess the severity of the mitral stenosis and any potential atrial enlargement.
Section 2
New Diagnostic Results:
Following the initial assessment, the physician orders an echocardiogram to further evaluate the mitral valve and assess the degree of stenosis. The echocardiogram reveals mild mitral stenosis with a valve area of 1.8 cm². There is also mild left atrial enlargement, which is consistent with the patient's clinical symptoms. The left ventricular function appears normal, with an ejection fraction of 60%, suggesting that the heart's pumping ability remains unaffected at this stage. These findings indicate that the patient is in the early stages of mitral stenosis, with no significant impact on cardiac output or pulmonary circulation at present.
In addition to the echocardiogram, routine blood tests are conducted, including a complete blood count (CBC) and basic metabolic panel (BMP). The results show a normal hemoglobin level of 13.5 g/dL, ruling out anemia as a contributing factor to the patient's fatigue. Electrolytes are within normal limits, and renal function tests reveal a creatinine level of 0.9 mg/dL, indicating healthy kidney function. These laboratory results provide reassurance that there are no underlying systemic conditions exacerbating the patient's cardiac symptoms.
With these diagnostic results in hand, the healthcare team decides to adopt a conservative management approach, focusing on lifestyle modifications and symptom monitoring. The nurse discusses these findings with the patient, emphasizing the importance of maintaining regular follow-up visits to monitor her condition. The patient is advised to engage in moderate physical activity, avoid excessive salt intake, and report any new symptoms such as increased fatigue, palpitations, or shortness of breath. The nurse also provides educational materials about mitral stenosis and encourages the patient to ask questions, ensuring she feels informed and supported as she navigates her condition.
Section 3
A month after the initial diagnosis, the patient returns for a follow-up appointment. During the visit, the nurse conducts a thorough assessment, noting that the patient reports feeling slightly more fatigued than usual and experiencing occasional palpitations. On examination, vital signs reveal a blood pressure of 120/80 mmHg, heart rate of 82 beats per minute, respiratory rate of 18 breaths per minute, and oxygen saturation of 98% on room air. The patient's weight remains stable, and there are no signs of edema or jugular venous distention. Heart auscultation detects a soft diastolic murmur consistent with mitral stenosis, but no new murmurs or additional heart sounds are present.
Given these findings, the healthcare team decides to conduct another echocardiogram to ensure no progression of the mitral stenosis and to investigate the cause of the palpitations. The echocardiogram results show that the mitral valve area remains unchanged at 1.8 cm², and the left atrial enlargement is stable. Importantly, no atrial fibrillation or other arrhythmias are noted during a brief Holter monitor test, suggesting that the palpitations might be benign in nature. The patient's ejection fraction remains at 60%, confirming that the left ventricular function is still normal.
The nurse discusses these results with the patient, reassuring her that the mitral stenosis remains mild and stable. Emphasis is placed on the importance of continuing lifestyle modifications to manage symptoms and reduce the risk of further complications. The patient is encouraged to maintain moderate physical activity and adhere to dietary modifications, while monitoring for any new symptoms. To address the palpitations, the nurse advises the patient to keep a diary of when they occur and any associated activities, which can help identify any potential triggers. The patient leaves feeling reassured and well-informed, with a plan for regular monitoring and follow-up appointments to ensure her condition remains stable.
Section 4
Two months after the follow-up appointment, the patient returns for another routine check-up. During the initial assessment, the nurse notes that the patient has been experiencing slightly increased fatigue and occasional shortness of breath during moderate activities, such as climbing stairs. The patient's vitals are stable, with a blood pressure of 118/76 mmHg, heart rate of 80 beats per minute, respiratory rate of 20 breaths per minute, and an oxygen saturation of 97% on room air. Her weight remains consistent, and there is still no evidence of peripheral edema or jugular venous distention. Upon auscultation, the diastolic murmur associated with mitral stenosis is still present, but no new cardiac sounds are detected.
Given these subtle changes in symptoms, the healthcare team decides to repeat the echocardiogram and conduct additional diagnostic tests to investigate further. The echocardiogram shows no significant change in the mitral valve area, which remains at 1.8 cm², and the left atrial enlargement remains stable. However, a slight increase in pulmonary artery pressure is noted, which could explain the patient's mild shortness of breath. Laboratory tests reveal normal kidney function and electrolytes, but a mild elevation in B-type natriuretic peptide (BNP) suggests some increase in cardiac stress.
In light of these findings, the nurse and healthcare team focus on reinforcing the patient's adherence to lifestyle modifications and the importance of managing contributing factors such as blood pressure and fluid balance. The patient is advised to continue her current exercise regimen while avoiding activities that exacerbate her symptoms. Additionally, the nurse discusses potential adjustments in diet and fluid intake to manage the mild increase in pulmonary pressure. The patient is encouraged to continue monitoring her symptoms and maintain regular follow-up appointments to ensure her condition remains stable and to address any new changes proactively.
Section 5
Two weeks after the patient's routine check-up, she returns to the clinic due to increased fatigue and more frequent episodes of shortness of breath, even during light activities such as walking short distances. During the initial assessment, the nurse notes that her vital signs remain within normal limits, with a blood pressure of 116/74 mmHg, heart rate of 82 beats per minute, and respiratory rate of 22 breaths per minute. However, her oxygen saturation has slightly decreased to 95% on room air. Her weight is stable, and there is still no evidence of peripheral edema or jugular venous distention. When auscultating her heart, the nurse identifies the persistent diastolic murmur, but no additional cardiac sounds are present.
Concerned about the increase in symptoms, the healthcare team decides to conduct another round of diagnostic tests. A repeat echocardiogram indicates that the mitral valve area is unchanged, but there is a slight further increase in pulmonary artery pressure, suggesting escalating pulmonary hypertension. The laboratory tests show a mild increase in B-type natriuretic peptide (BNP) levels, indicating ongoing cardiac stress. Other laboratory values remain within normal ranges, including kidney function and electrolytes.
Given these findings, the healthcare team discusses potential adjustments to the patient's management plan. The focus is on optimizing her current lifestyle modifications and considering the introduction of pharmacological interventions to manage pulmonary hypertension and further alleviate cardiac stress. The nurse plays a crucial role in educating the patient about potential medication options, their side effects, and the importance of adherence. The patient is encouraged to continue monitoring her symptoms closely and to maintain regular follow-up appointments to ensure her condition is effectively managed and to promptly address any changes. This proactive approach aims to prevent further complications and support the patient's quality of life.