Impact of hypochloremia as a prognostic factor in patients with heart failure, a retrospective cohort study.

Background: some studies suggest that hypochloremia is a risk factor in the prognosis of heart failure (HF) in patients with recent decompensation.
Materials and Methods: retrospective cohort study of patients discharged due to HF decompensation who began follow-up in a specialized clinic. Two groups are defined: patients with hypochloremia (chloride < 98 mmol/L) and normochloremic patients (chloride > 98 mmol/L) in the initial assessment within the first month after discharge. The rate of intravenous diuretic rescue, emergency department visits, readmission for HF and cardiovascular (CV) death are compared using a Cox proportional hazards model.
Results: 165 patients were included (59% women, mean age 85 years), with 60 (36%) having hypochloremia. Both groups were comparable in terms of baseline characteristics, except for female sex, presence of peripheral artery disease, moderate-to-severe liver disease (more prevalent in the hypochloremia group), PROFUND index, and baseline furosemide dose (higher in patients with hypochloremia). The incidence of the primary event was higher in subjects with hypochloremia than in normochloremic subjects (HR: 1.59, 95% CI 0.97-2.62), mainly due to the need for intravenous diuretic rescue (HR: 1.86, 95% CI 1.07-3.24).
Conclusions: hypochloremia following admission for HF decompensation is associated with a greater need for intravenous diuretic rescue therapy and probably worse overall prognosis across the spectrum of the disease, regardless of left ventricular ejection fraction (LVEF).
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