Patients With Hypertrophic Cardiomyopathy and Normal Genetic Investigations Have Few Affected Relatives

BACKGROUND

Current guidelines recommend that relatives of index patients with hypertrophic cardiomyopathy (HCM) are offered clinical investigations to identify individuals at risk of adverse disease complications and sudden cardiac death. However, the value of family screening in relatives of index patients with a normal genetic investigation of recognized HCM genes is largely unknown.

OBJECTIVES

The purpose of this study was to perform family screening among relatives of HCM index patients with a normal genetic investigation to establish the frequency of familial disease and the clinical characteristics of affected individuals.

METHODS

Clinical and genetic investigations were performed in consecutive and unrelated HCM index patients. Relatives of index patients who did not carry pathogenic/likely pathogenic variants in recognized HCM genes were invited for clinical investigations.

RESULTS

In total, 60% (270 of 453) of HCM index patients had a normal genetic investigation. A total of 80% of their relatives (751 of 938, median age 44 years) participated in the study. Of these, 5% (34 of 751) were diagnosed with HCM at baseline, whereas 0.3% (2 of 717 [751-34]) developed the condition during 5 years of follow-up. Their median age at diagnosis was 57 years (IQR: 51-70 years). Two-thirds (22 of 36) were diagnosed following family screening, whereas one-third (14 of 36) had been diagnosed previously because of cardiac symptoms, a murmur, or an abnormal electrocardiogram. None of the affected relatives experienced adverse disease complications. The risk of SCD was low.

CONCLUSIONS

Systematic family screening of index patients with HCM and normal genetic investigations was associated with a low frequency of affected relatives who appeared to have a favorable prognosis.

The diagnostic workup in a patient with AMC: Overview of the clinical evaluation and paraclinical analyses with review of the literature

Arthrogryposis multiplex congenita, or AMC, is a clinical sign defined as congenital contractures of at least two joint levels. These joint contractures are always secondary to diminished fetal movement which can have numerous causes that affect any part of the anatomical structures implicated in movement: the central nervous system, the anterior horn cell, the nerve, the neuromuscular junction, the muscle, or the joint itself. Make a precise diagnosis of the cause in a patient with multiple joint contractures is therefore challenging. The aim of this article is to summarize the use and diagnostic value of common examinations and analyses performed postnatally in patients affected by AMC from a literature review. We also compare this data with results from our clinical practice. Even though it is difficult to give precise guidelines today, it appears that genetic studies, such as whole exome or genome analysis in all patients and chromosomal microarray analysis in patients with intellectual disability and AMC should be preferred as first tier investigations over EMG and muscle biopsy.

A Rare Case of Pregnancy with Restrictive Cardiomyopathy

Restrictive cardiomyopathy (RCM) is a relatively rare form of cardiomyopathy with high mortality which is characterized by impaired filling of the ventricles in the presence of normal wall thickness and systolic function. RCM is generally seen in association with infiltrative, storage, or systemic diseases. We present a rare case of familial RCM with pregnancy which was successfully managed.