Why is there relative bradycardia in dengue?

The cardiac manifestations in dengue, also an arboviral infection, are invariably benign, transient and self-limited and are attributed to subclinical viral myocarditis, various ECG abnormalities (sinus bradycardia and prolongation of the PR interval) have been demonstrated in 44- 75% of patients with viral …

What is relative bradycardia?

Relative bradycardia is the term used to describe the mechanism where there is dissociation between pulse and temperature. This finding is important to recognize since it may provide further insights into the potential underlying causes of disease. There is no known proposed mechanism to explain this phenomenon.

What causes relative bradycardia?

The most common cause of relative bradycardia or pulse- temperature deficits in patients with fever are b-blocker med- ications. b-Blockers decrease the pulse in patients with fever. Relative bradycardia as a diagnostic sign should not be applied in patients on b-blockers.

What is relative bradycardia in typhoid fever?

Relative bradycardia as a clinical sign in an individual patient held no predictive value regarding the likely type of infection. Relative bradycardia as a characteristic feature of specific disease was found for typhoid fever (P = 0.003), Legionnaire’s disease (P = 0.005), and pneumonia caused by Chlamydia sp.

Does heart rate increases in dengue?

Mean heart rates were significantly lower in the dengue group: 87.6 (±12.5) beats/min (dengue) and 104.6 (±14) beats/min (controls) (p<0.0001). Electrocardiographs (ECGs) were available for 10 of the dengue group, and all showed normal sinus rhythm. Three patients with bradycardia had an ECG.

Does dengue affect heart?

Dengue virus infection affects the heart structurally and functionally. Clinical manifestations of cardiac complications secondary to dengue virus infection vary from self-limiting arrhythmias to severe myocardial infarction, leading to hypotension, pulmonary edema, and cardiogenic shock.

Why is it called bradycardia?

The word “bradycardia” is from the Greek βραδύς bradys “slow”, and καρδία kardia “heart”.

What is the pattern of fever in dengue?

The fever pattern is classically biphasic or “saddleback,” breaking and then returning for 1 or 2 more days. In some people, the disease proceeds to a critical phase as the fever resolves. This phase is characterized by significant, diffuse leakage of plasma typically lasting 1–2 days.

Does dengue cause chest pain?

Myocarditis is an inflammation of the myocardium. Viral infection is one of the most common causes of myocarditis. Although rare, dengue has been reported to cause myocarditis.