Volume 63, Issue 5 pp. 683-689
CLINICAL RESEARCH ARTICLE

Diaphragmatic dysfunction at the first visit to a chest diseases outpatient clinic in 500 patients with amyotrophic lateral sclerosis

Aylin Pihtili MD

Aylin Pihtili MD

Istanbul Faculty of Medicine, Department of Pulmonary Medicine, Istanbul University, Istanbul, Turkey

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Zuleyha Bingol MD

Zuleyha Bingol MD

Istanbul Faculty of Medicine, Department of Pulmonary Medicine, Istanbul University, Istanbul, Turkey

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Hacer Durmus MD

Hacer Durmus MD

Istanbul Faculty of Medicine, Department of Neurology, Istanbul University, Istanbul, Turkey

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Yesim Parman MD

Yesim Parman MD

Istanbul Faculty of Medicine, Department of Neurology, Istanbul University, Istanbul, Turkey

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Esen Kiyan MD

Corresponding Author

Esen Kiyan MD

Istanbul Faculty of Medicine, Department of Pulmonary Medicine, Istanbul University, Istanbul, Turkey

Correspondence

Esen Kiyan, Istanbul University, Istanbul Faculty of Medicine, Department of Pulmonary Medicine, Post code: 34360 Capa, Istanbul, Turkey.

Email: [email protected]

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First published: 11 February 2021
Citations: 4

Abstract

Introduction

In this study, we aimed to evaluate diaphragmatic dysfunction (DD) by using a practical approach in patients with amyotrophic lateral sclerosis (ALS) at the first visit to a chest diseases outpatient clinic.

Methods

Patients with ALS seen in our outpatient clinic for the past 5 y and followed up for at least 1 y, were retrospectively evaluated. Having at least one of the following three criteria was accepted as DD: (a) paradoxical abdominal movement (PAM), (b) sitting-supine forced vital capacity (FVC) difference ≥ 20%, (c) sitting-supine arterial oxygen saturation measured by pulse oximetry (SpO2) difference ≥ 4%. Respiratory symptoms, arterial blood gas analysis, sleep studies, noninvasive mechanical ventilation use, and mortality were recorded.

Results

Five-hundred patients with ALS were included (female/male: 220/280, age: 58.9 ± 11.3 y). Of the patients, 22.8% had daytime hypercapnia. DD was observed in 55% of the patients (PAM in 112, sitting-supine FVC difference ≥ 20% in 50, and sitting-supine SpO2 difference ≥ 4% in 113 patients). Of the patients with DD, 31.6% (n = 87) had no respiratory symptoms, 46.4% had FVC > 70% and 33.5% had FVC <50%. Nocturnal hypoxemia (sleep time spent with SpO2 < 90% ≥30%) was present in 59.7%, and all patients with nocturnal hypoxemia had DD. Obstructive sleep apnea (8 severe, 14 moderate, 39 mild) was detected in 55% of the patients with polysomnography (n = 61) or polygraphy (n = 50). During follow-up, 52.2% of the patients died. Mean survival time was shorter in patients with DD (P < .001).

Conclusion

Paradoxical abdomimal movement (PAM), sitting-supine SpO2 difference ≥ 4% and sitting-supine FVC difference ≥ 20% are indicators of DD, which should be routinely evaluated at every outpatient visit.

CONFLICT OF INTEREST

None of the authors has any conflict of interest to disclose.

DATA AVAILABILITY STATEMENT

Author elects to not share data.

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