|CURRICULUM IN CARDIOLOGY - CASE DISCUSSION
|Year : 2018 | Volume
| Issue : 2 | Page : 126-131
Pulmonary arterial hypertension with frequent syncope: Clinical case presentation
Aseem Basha, Shanmugam Krishnan, Jaskaran Gujral, KC Goswami
Department of Cardiology, AIIMS, New Delhi, India
|Date of Web Publication||10-Sep-2018|
Dr. Aseem Basha
Department of Cardiology, AIIMS, New Delhi
Source of Support: None, Conflict of Interest: None
Pulmonary arterial hypertension presenting with frequent syncope has been highlighted in this bedside case discussion. The clinical approach to such a patient, including review of the ecg, chest radiograph and echocardiogram is presented. Various aspects of the bedside approach to adult cyanotic heart disease are discussed. Special emphasis on management strategies in pulmonary arterial hypertension have also been discussed.
Keywords: Epileptic seizure, NYHA, postictal
|How to cite this article:|
Basha A, Krishnan S, Gujral J, Goswami K C. Pulmonary arterial hypertension with frequent syncope: Clinical case presentation. J Pract Cardiovasc Sci 2018;4:126-31
|How to cite this URL:|
Basha A, Krishnan S, Gujral J, Goswami K C. Pulmonary arterial hypertension with frequent syncope: Clinical case presentation. J Pract Cardiovasc Sci [serial online] 2018 [cited 2021 Jan 21];4:126-31. Available from: https://www.j-pcs.org/text.asp?2018/4/2/126/240966
| Clinical Presentation|| |
A 31-year-old female, a resident of Uttar Pradesh, India, presented with complaints of:
- Shortness of breath on exertion for 4 months
- Three episodes of syncope in the last 3 months.
She was apparently well 4 months back when she developed dyspnea on exertion, which had progressed from NYHA class I at the onset to NYHA class II over 4 months. During the last 4 months, she had three episodes of syncope. She had these three episodes of loss of consciousness while shopping and climbing stairs. Each episode occurred following exertion and was associated with loss of postural tone, transient blackout, and jerky movements of limbs followed by complete recovery in 5–10 min. There was no postictal drowsiness or focal deficits after the event. There was no history of chest pain, palpitations, cyanosis, clubbing, alcohol abuse, and drug intake. Her medical history was significant for hypothyroidism for which she was on thyroid supplements, and she was nondiabetic and nonhypertensive. She underwent a medical termination of pregnancy (MTP) a month prior to her onset of symptoms. There was no other significant medical/surgical or psychiatric illness. Family history was noncontributory. Her three previous pregnancies were uneventful.
| Summary at the End of History|| |
The case was a 31-year-old female symptomatic for 4 months in the form of progressive dyspnea on exertion with three episodes of exertional syncope in the last 3 months.
| Discussion|| |
Is it seizure or syncope?
The events described seem to favor syncope over seizures. All the episodes were exertional. The jerky movements during syncope differ from those accompanying a grand mal epileptic seizure, which are described as follows:
- Would be briefer in patients with syncope
- Usually occur after the loss of consciousness has set in
- Usually do not have the symmetric tonic-clonic features of a grand mal epileptic seizure.
Furthermore, seizure may be preceded by an aura, associated with automatism, of relatively prolonged duration, and usually succeeded by postictal drowsiness and confusion.
What is the first differentia diagnosis on the basis ofyour history?
The first differential diagnosis would be an obstructive valve lesion such as aortic stenosis or hypertrophic cardiomyopathy in view of progressive dyspnea and exertional syncope.
What are your differential diagnoses?
In addition to obstructive lesions such as aortic stenosis, hypertrophic obstructive cardiomyopathy, tachyarrhythmias, bradyarrhythmias, tetralogy of Fallot, and severe pulmonary arterial hypertension (PAH) should also be considered in the differentials.
Hypertrophic obstructive cardiomyopathy
Hypertrophic obstructive cardiomyopathy is the most important cause of self-terminating ventricular arrhythmias, which can also present with shortness of breath and syncope and would be the second differential based on the history.
A young lady with complaints of shortness of breath on exertion and syncope should also warrant an evaluation for pulmonary arterial hypertension. In addition, a history of MTP prior to the onset of symptoms may also point toward the possibility of thromboembolic pulmonary hypertension.
Tachyarrhythmias and bradyarrhythmia
Tachyarrhythmias and bradyarrhythmia are the second most common cause of cardiac syncope; however, progressive shortness of breath in the absence of palpitation would make it less likely.
Tetralogy of Fallot
Tetralogy of Fallot can also give rise to progressive exertional dyspnea and exertional syncope. Absence of the history of cyanosis and clubbing, however, makes it unlikely.
Eisenmenger syndrome can also have a similar presentation. However, in the absence of a history of recurrent hospital admissions in early infancy, an uneventful childhood and adolescence make the possibility of Eisenmenger syndrome less likely.
How common is syncope in these conditions?
Listed below are the common cardiac causes of syncope and their relative incidence are summarized in [Table 1].
What are the mechanisms for syncope in the above-mentioned differential diagnoses?
- Aortic stenosis
- Syncope on exertion
Syncope at rest
- Reduced cerebral perfusion that occurs during exertion when arterial pressure declines consequent to systemic vasodilation in the presence of a fixed cardiac output (CO)
- Malfunction of the baroreceptor
- Vasodepressor response to a greatly elevated left ventricular (LV) systolic pressure during exercise.
- Syncope at rest may be caused by transient atrial fibrillation (AF) with loss of the atrial contribution to LV filling, which causes a precipitous decline in CO
- Transient atrioventricular block caused by extension of the calcification of the valve into the conduction system.
Primary hemodynamic mechanism
- Paroxysmal AF or supraventricular tachycardia
- Complete heart block
- Sinus node dysfunction
- Sustained ventricular tachycardia
- LV outflow tract obstruction
- Inappropriate vasodilation consequent to abnormal vascular control due to inappropriate vasodilation
- Hypotension due to impaired filling when preload is decreased in the setting of diastolic dysfunction
- Loss of ventricular adaptation to afterload
- Decreased right ventricular (RV) output and RV–LV interdependence
- Uncoupling between RV and pulmonary circulation
- Unmet demand to increase CO during exercise
- Drop in systemic pressure due to an abrupt decrease in stroke volume
- Other contributors
- RV and/or LV ischemia due to
- Subendocardial microcirculation
- Dynamic occlusion of left coronary artery due to PA dilatation
| Examination|| |
The patient was an average-built female. Pulse was 92 beats/min; regular, normal volume, no radio-radial or radio-femoral delay, and all peripheral pulses were palpable. Blood pressure was 100/70 mmHg in the left upper limb in supine position with no significant difference in upper- and lower-limb blood pressures and there was no postural drop. Her respiratory rate was 18/min, and she was afebrile at the time of presentation. Jugular venous pressure (JVP) was elevated, 6 cm above the sternal angle with prominent “a” waves. There was no pallor, icterus, cyanosis, clubbing, or lymphadenopathy. Oxygen saturation was 98% on room air at rest and exertion.
Precordium was normal. Cardiac apex was visible in the left 5th intercostal space in the midclavicular line. There were no scars, sinuses, or dilated superficial veins.
Apex beat was present in the left 5th intercostal space in the mid-clavicular line, was diffuse, and was an RV type of apex. Palpable second sound was there in the left 2nd intercostal space and palpable S4 at the left lower sternal border was present. Grade II left parasternal heave was also appreciated.
Left cardiac border was coincident with the apex, right cardiac border was behind the sternum, and left second intercostal space was dull on percussion.
The first heart sound (S1) was normal. S2 was narrowly split with loud P2 component. RV S4 was heard in the left lower sternal border. There were a short ejection systolic murmur Grade II/VI heard in pulmonary area and a Grade 3/6 pansystolic murmur in the tricuspid area.
Respiratory system, central nervous system, and per abdomen examination findings were within normal limits.
Summary of clinical findings
Clinical examination revealed an average-built female with elevated JVP with prominent A waves, palpable S2 with Grade II parasternal heave with RV apex, auscultatory findings of narrow split second heart sound with loud P2 component, RV S4 with a short systolic murmur being heard in pulmonary area, and a Grade 3/6 pansystolic murmur in tricuspid area.
What is your diagnosis based on history and examinationfindings?
A young female, with complaints of dyspnea and syncope, on examination having features of pulmonary hypertension in the form of elevated JVP, loud and palpable P2, Grade II parasternal heave, RV S4, and a short mid-systolic murmur without differential cyanosis all point toward the diagnosis of idiopathic PAH (IPAH).
How do you differentiate idiopathic pulmonary arterial hypertension from Eisenmenger syndrome?
The differentiation has been summarized in [Table 2].,,
|Table 2: Differences between Eisenmenger syndrome and idiopathic pulmonary arterial hypertension|
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What are the investigations done in this case?
Electrocardiography (ECG) revealed sinus bradycardia with a heart rate of 55/min with T-wave inversion in V1–V3 and lead III. There was right-axis deviation. QT, QTc, and PR intervals were normal, and the ECG showed no evidence of right atrial enlargement [Figure 1].
|Figure 1: Electrocardiogram showing sinus bradycardia with a heart rate of 55/min with T-wave inversion in V1–V3 and lead III, right-axis deviation.|
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Chest X-ray posteroanterior view revealed enlarged main pulmonary, left pulmonary, and right pulmonary arteries with peripheral pruning. Lateral projection revealed RV enlargement [Figure 2] and [Figure 3].
|Figure 2: Chest X-ray posteroanterior view showing an enlarged main pulmonary, left pulmonary, and right pulmonary arteries with peripheral pruning along with dilated right ventricle.|
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|Figure 3: Chest X-ray lateral view showing obliteration of retrosternal space consequent to RV enlargement.|
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Echocardiography shows dilated right artery (RA), right ventricle (RV), moderate tricuspid regurgitation (TR), severe PAH with right ventricular systolic pressure = right arterial pressure + 80 mmHg, mild PR, no atrial septal defect, ventricular septal defect, or patent ductus arteriosus. Valves were normal, and there was no clot/vegetation. Contrast echo with agitated saline was negative for any shunts [Figure 4], [Figure 5], [Figure 6].
|Figure 4: Two-dimensional echocardiography apical 4-chamber view showing dilated right atrium and right ventricle.|
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|Figure 5: Doppler at tricuspid valve showing right ventricle systolic pressure = right atrial pressure + 80 mmHg.|
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Computed tomography pulmonary angiogram was suggestive of PAH with dilated RA and RV with right ventricular hypertrophy. There was no evidence of chronic thromboembolic pulmonary hypertension [Figure 7]. V/Q scan was negative.
|Figure 7: Computed tomography pulmonary angiography showing dilated pulmonary arteries, with dilated right artery and right ventricle (not shown in the representative image).|
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Six-minute walk test distance was 400 m. Ultrasound abdomen and pulmonary function tests were within normal limits. Systemic lupus erythematosus workup was also negative.
- Severe PAH-probably idiopathic, moderate TR 26
- WHO-FC II
- Normal sinus rhythm
- Normal biventricular function
- Congestive heart failure
What is your management strategy in pulmonary arterial hypertension?
There are three main steps in the management:
- General measures, supportive therapy, acute vasoreactivity testing
- Initial therapy with high-dose calcium channel blockers (CCBs) in vasoreactive patients or other drugs
- Response to initial treatment strategy, combination therapy, and surgical options.
General measures would include the following:
- Avoidance of pregnancy (COE I, LOE C)
- Immunization against influenza and pneumococcal infection (COE I, LOE C)
- Psychosocial support (COE IIa, LOE B)
- Avoidance of excessive physical activity that leads to distressing symptoms, preferring epidural rather than general anesthesia while being taken up for an elective surgery (COE IIa, LOE C).
- Diuretics: Used to treat fluid retention or when patient has signs of RV failure (COE I, LOE C)
- Oxygen therapy: Continuous long-term O2 therapy is recommended in PAH patients when arterial blood O2 pressure is consistently <60 mmHg (COE I, LOE C)
- Anticoagulation therapy: Controversial may be considered (COE IIb, LOE C).
- Correction of anemia and/or iron status may be considered (COE IIb, LOE C).
Acute vasoreactivity testing
The current consensus definition of a positive response is defined as a fall in mean pulmonary arterial pressure (mPAP) of at least 10 mmHg to a mPAP of 40 mmHg or less with unchanged or increased CO. Patients who meet these criteria may be treated with a CCB agent and should be monitored closely for both safety and efficacy of therapy.
Calcium channel-blocking agents
Patients who meet these criteria may be treated with a CCB agent and should be monitored closely for both safety and efficacy of therapy (COE I, LOE C). Patients with IPAH should be initiated on high-dose CCBs and should be continued on high dose in WHO-FC I or II with marked hemodynamic improvement.
Pulmonary arterial hypertension-specific therapy
Patients with initiation of PAH-specific therapy in WHO-FC III or IV or those without marked hemodynamic improvement even after high doses of CCBs get a COE I, LOE C.
- Prostacyclin receptor agonists: Epoprostenol, treprostinil (intravenous or subcutaneous), iloprost (inhaled), and selexipag (oral)
- Endothelin receptor antagonists: Bosentan, macitentan (nonselective), and ambrisentan (selective)
- Phosphodiesterase 5 inhibitors: Sildenafil and tadalafil
- Guanylate cyclase stimulators: Riociguat
- Monotherapy with ambrisentan/bosentan/sildenafil in WHO-FCII, III
- Monotherapy with macitentan/tadalafil/riociguat WHO-FC II and III and may be in WHO-FC IV
- Monotherapy with parenteral prostacyclins is indicated in WHO III and IV.,,,,,,,,,
Combination therapy may have additive effect or same effect at lower dose of each agent. They can be used as an add-on (sequential) therapy or initiated together, With the best efficacy combination therapy being tadalafil and ambrisentan as shown in AMBITION trial.,,,,
Surgical options are indicated in severe symptomatic patients with PAH, despite medical therapy. It includes the following:
- Atrial septostomy
- Potts shunt
- Bilateral lung or heart-lung transplantation (procedure of choice).
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient has given her consent for her images and other clinical information to be reported in the journal. The patient understand that her name and initials will not be published and due efforts will be made to conceal her identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7]
[Table 1], [Table 2]