Study Notes on Syncope Presentation

Demonstrate a focused history and physical assessment for a patient with syncope.
Discuss etiology, incidence, and risk factors in syncope.
Discuss assessment findings, differential diagnosis, and diagnostics in primary care.
Describe treatment options, both non-pharmacologic and pharmacologic in syncope, including referral and collaboration.
Discuss follow-up procedures and patient teaching.
Evaluate health outcomes of the management plan.

Definition:
- A sudden, brief loss of consciousness with a spontaneous recovery.

Vasovagal Syncope:
- Caused by decreased cardiac output due to peripheral vasodilation and bradycardia.
Orthostatic Hypotension:
- Resulting from medication, hypovolemia, or autonomic dysfunction.
Situational Syncope:
- Triggered by actions such as coughing, micturition, or defecation.
Cardiac Causes:
- Sudden decrease in cardiac output, which can be due to aortic stenosis, arrhythmias (e.g., heart block, ventricular tachycardia, atrial tachycardias).
Carotid Sinus Syncope:
- Due to manual pressure/stimulation of the carotid arteries.
Cerebrovascular Disease:
- Resulting from decreased perfusion of the vertebra-basilar system.
Other Causes:
- Includes depression, alcohol ingestion, drug abuse, psychogenic origins, and cardiomyopathy.

Incidence Rates:
- 6% in individuals over age 75 years.
- More prevalent in the elderly population.
- Unidentifiable causes in approximately 48% of patients.

Underlying Conditions:
- Existing cardiac disease.
Medications:
- Patients on antihypertensive and antiarrhythmic medications.
- Use of antidepressants, diuretics, phenothiazines, and vasodilators.
- Presence of a malfunctioning pacemaker.

Symptoms may include feelings of lightheadedness, weakness, nausea, vomiting, and diaphoresis.
Loss of Consciousness:
- Accompanied by loss of postural tone.
Spontaneous Recovery:
- Patients typically recover quickly after an episode.

Vasovagal Syncope:
- May be precipitated by fear, anxiety, or sudden emotions, leading to a sudden onset of weakness, sweating, and nausea.
Orthostatic Hypotension:
- Occurs when the patient stands up.
Situational Syncope:
- May be linked to actions like swallowing, coughing, micturition, or defecation.
Cardiac Arrhythmias:
- Often characterized by abrupt onset without prior warning, possibly related to physical activity, electrolyte imbalances (especially potassium, calcium & magnesium), malfunctioning prosthetic devices, hypoxia, or coronary artery disease.
Carotid Sinus Syncope:
- Often associated with bradycardia, and turning the neck may trigger an episode.
Cerebrovascular Disease:
- Symptoms may include auditory, visual, or vestibular disturbances before syncope, with prior transient ischemic attacks (TIAs) being relevant.

Complete Metabolic Panel:
- Important components include sodium, calcium, and glucose.
24-hour ECG Monitoring:
- Considered helpful in 4-15% of cases.
Blood Pressure Measurements:
- Measured in both arms; a difference of 20 mm/Hg or more is noted as abnormal.
- Assess lying, sitting, and standing blood pressure:
- Normal results indicate systolic pressure drops of less than 10 mm/Hg, diastolic increases of 2-5 mm/Hg, and heart rate increases between 5-20 beats/min.
- An absence of heart rate increase may suggest a cardiac origin.
Neck Movement Assessment:
- Flexion/extension of the neck performed ten times to stimulate potential vertebrobasilar insufficiency.
Arm Movement Assessment:
- Flexion/extension of arms to check symptoms of subclavian steal syndrome, indicative of subclavian artery occlusive disease.
Complete Neurological Examination:
- If abnormalities persist, consider CT, MRI, or EEG tests.

Complete Cardiac Exam:
- Includes carotid auscultation, where the presence of a bruit signifies possible blockage.
Echocardiogram:
- Conducted if valvular issues or cardiomyopathy are suspected.
Tilt Table Testing:
- Performed at tertiary centers and may involve isoproterenol infusion.
Outcome Observation:
- It is important to note that only 50-60% of patients might have an identifiable cause after thorough examination.

Positioning:
- Elevate the patient’s legs if syncope is due to vasovagal responses or hypotension.
Preventive Measures:
- Use elastic support stockings to combat orthostatic hypotension.
- Advise patients to change positions slowly, particularly when moving to an upright posture.
Dietary Adjustments:
- Recommend an increase in sodium intake to aid in expanding circulatory volume.
Safety Teaching:
- Educate patients on preventive measures to ensure safety, such as avoiding climbing on stools, not operating heavy machinery, and refraining from bathing in hot tubs.
Individualized Actions:
- Additional actions will depend on the specific underlying cause of syncope.

Medication Specifics:
- Management is contingent on the underlying cause.
- Beta-blockers may be effective in preventing recurrent vasovagal symptoms.
- Antiarrhythmic drugs are indicated for documented arrhythmias.

Vasovagal Syncope in Pregnancy:
- Pregnancy may lead to vasovagal syncope due to compression of the vena cava and aorta.
- Positioning the pregnant woman on her left side can alleviate compression symptoms.

Consultation Recommendations:
- Refer to a cardiologist and/or neurologist based on etiology.
- Often involved if the patient is hospitalized.
- Complete evaluation may lead to extensive testing, often termed a "million dollar workup."
Follow-up and Expected Course:
- Varies based on the underlying etiology of the syncope episode.

Potential Risks:
- Head Injury:
- Risk from falls during episodes of syncope.
- Sudden Death:
- More prevalent if the underlying cause is cardiac in nature.