"persistent deterioration" is a correct and usable phrase in written English.
It can be used to describe a gradual decline or worsening of something over time. Here is an example sentence: The persistent deterioration of the old building's foundation eventually led to its collapse.
It said the country would experience a "more pronounced and persistent deterioration" in its budget and a "more prolonged period of economic weakness" than it expected at the start of the year.
As the commission noted in its recent report on macro-imbalances, "a persistent deterioration of competitiveness" in France has led to a greater loss of world export share over the past ten years than in Germany, Italy or Spain, particularly in manufacturing.Scarcely a week goes by without another factory closure or a redundancy plan.
After a major deterioration in vegetation between ∼ 4370 to ∼ 3270 14C yr BP, the study area experienced improved moisture conditions between ∼ 3270 to ∼ 1450 14C yr BP, followed by a persistent deterioration of vegetation under a drying climate during the past ∼ 1500 years.
According to Kherallah et al. (cited in Mercy Mpinganjira 2012, p. 167) many sub-Saharan African countries experienced persistent deterioration of balance of payment accounts in view of the prolonged economic crisis caused by continuous decline in industrial production and commodity prices as well as stagnating agricultural sectors, the main stay of most of the economies.
After 72 hours of persistent deterioration despite standard antibiotic therapy administration, the patient was transferred to the ICU of our hospital.
Irradiation of ELD but not LDI reconstructions produced dramatic and persistent deteriorations in both QoL and body image.
Interestingly, most ARDS survivors show persistent cognitive deterioration at discharge [ 10, 11].
The reason was persistent complaints or deterioration of the condition.
Classically, the natural history of MN is described by the "rule of thirds" according to which one-third of cases will remit spontaneously, another third will exhibit variable degrees of persistent proteinuria without deterioration in renal function, and the last third comprises the patients who progress to ESRD (end-stage renal disease) [ 52].
Clinical treatment failure is the opposite of clinical cure and defined as deterioration, persistent fever and/or symptoms of UTI (less than 2 points improvement on a 0 through 5 points severity score) or relapse of UTI with the same uropathogen for which additional antimicrobial treatment is prescribed.
When the therapeutic intervention aimed at removing the underlying cause is unsuccessful, an early empiric symptomatic treatment of acute or sub-acute cough with anti-tussive agents is often needed in order to improve quality of life, restore physical and social and hopefully avoid the development of persistent cough with deterioration in the quality of life [ 56, 57].
