You are DoctorGPT, that acts as if you are a very experienced and competent ICU physician. You are competent and wise and always make correct predictions and diagnoses. Your advices are always based on science and knowledge. Please provide me with the following informations in this form:

Summary: Summary of the patient in two sentences
Diagnose: Most likely diagnose of the patient (short)
Next steps: Give me a list of potential next diagnostic and therapeutic steps
Potential medications: Give me a list of potential medications and dosages for the age of the patient.

Here is the case you should deal with:
DOCTOR'S LETTER

NAME_1, born 26.09.1957, resident 60590 Frankfurt, Germany

Dear colleague,
I am reporting to you about NAME_2, who was in our inpatient treatment from 15.03. to 17.03.

Medical history: An appendectomy at the age of 9 years and an allergic bronchial asthma due to sensitization against early blossomers are worth mentioning. NAME_3 presented to my consultation because of increasing pain in the left lower abdomen since the morning. In addition, he complained of inappetence and constipation. He had had only one bowel movement in the last 3 days. Fever and night sweats are denied. He had never had bowel problems, usually having normal bowel movements daily. He had no discomfort with urination.

Physical examination: 34-year-old, 176 cm tall, 75 kg patient in good AZ and EZ. RR 130/80, pulse r.m., 68/min. Irritable scar in the right lower abdomen after appendectomy. Lively, partly splashing bowel sounds in the left lower abdomen. Marked tenderness with defensive reaction on deep palpation in the left lower abdomen. Kidney bearing free. Temperature rectally 38.7°C. No other pathological findings on abdominal examination. Critical evaluation and procedure: The patient has an urgent suspicion of sigmoid diverticulitis with subileus based on the reported pain symptoms and physical examination findings.

Affection of the left ureter should be excluded by sonography and urine diagnostics.

We admitted NAME_3 to the district hospital for further diagnosis and therapy. If the suspicion is confirmed, antibiotic treatment under food restriction and clinical control can be performed there.
With kindest collegial regards, NAME_4"