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[Holter electrocardiography. Analysis of 700 cases]
Insights
This study found that symptoms do not reliably indicate the presence or severity of heart arrhythmias. Many severe arrhythmias, such as ventricular tachycardia, can occur without noticeable symptoms, highlighting a disconnect between patient-reported issues and actual cardiac events.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Statistics
Context:
- Holter Electrocardiogram (ECG) monitoring is crucial for diagnosing arrhythmias.
- Understanding the relationship between patient symptoms and objective arrhythmia findings is clinically significant.
- Prevalence of arrhythmias varies across populations and demographic groups.
Purpose:
- To investigate the correlation between reported symptoms and the presence/severity of cardiac arrhythmias detected by Holter ECG.
- To analyze the distribution of supraventricular and ventricular arrhythmias in a patient cohort.
- To determine if symptom frequency is independent of arrhythmia onset and classification.
Summary:
- A study of 700 patients revealed that 47% had supraventricular and 56% had ventricular arrhythmias.
- Most ventricular arrhythmias were mild (Lown's Group I), suggesting severe arrhythmias are infrequent in this population.
- Statistical analysis (X2 test) confirmed that symptoms are not related to the occurrence or severity of arrhythmias, and severe arrhythmias can be asymptomatic.
Impact:
- Findings suggest that relying solely on symptoms may lead to missed diagnoses of potentially serious arrhythmias.
- Highlights the importance of objective diagnostic tools like Holter ECG, irrespective of symptom reporting.
- Informs clinical practice regarding patient evaluation for cardiac arrhythmias, emphasizing the need for comprehensive assessment beyond subjective complaints.
Abstract:
Seven hundred patients, 337 male (48.2%), 363 female (51.8%) requiring Holter Electrocardiogram were studied. The predominant age group ranged from 50 to 59. Symptoms were more frequent in women. Lown's classification was used to determine the frequency of arrhythmias; 47% were supraventricular arrhythmias and 56% were of ventricular origin. Most of the latter (30.9%) were included in Group I of the classification. The remaining cases appeared in a decreasing distribution in the other groups. This suggests that in our population, severe arrhythmias are infrequent. With the hypothesis that distribution of symptoms is independent from arrhythmia onset, a multiple contingency table was designed. The X2 value was 82 with freedom of 316 degrees. It confirms that 1) severe arrhythmias (ventricular tachycardia, frequent ventricular premature beats or couplets) may go unnoticed, and on the other hand 2) Symptoms are not related with occurrence or severity of arrhythmias.