What ratio indicates a suspicion of IHSS when measuring IVS to LVPW thickness?

The ratio that indicates suspicion of Hypertrophic Obstructive Cardiomyopathy (IHSS) when measuring the interventricular septum (IVS) thickness to the left ventricular posterior wall (LVPW) thickness is known to be 1.3 to 1. This specific ratio reflects the asymmetry in wall thickening that is characteristic of hypertrophic cardiomyopathy. In this condition, the IVS becomes significantly thicker compared to the LVPW, leading to the ratio above this threshold being suggestive of the disease.

In clinical practice, when a ratio is calculated, ratios higher than 1.3 may signal that there is a concerning pattern of hypertrophy that warrants further evaluation for IHSS. Therefore, identifying a 1.3 to 1 ratio serves as a critical diagnostic indicator that clinicians use in assessing the potential presence of this condition.

Understanding this threshold allows sonographers and healthcare providers to recognize patients who may require further intervention or monitoring due to the risks associated with IHSS, such as outflow tract obstruction and sudden cardiac events.