Learn Polish: Obiecuję pomoc samotnym pacjentom. - I promise help to lonely patients.

The verb obiecuję (I promise) takes the dative case for the person receiving the promise, answering the question "to whom?". For plural nouns, the dative ending is -om, and for plural adjectives, it is -ym or -im.

Is the -om ending in pacjentom used for all genders in the dative plural?

Yes! The dative plural is one of the easiest cases to remember. No matter if the noun is masculine, feminine, or neuter, it will always take the -om ending in the plural.

If samotnym pacjentom is dative, what case is pomoc (help)?

pomoc is in the accusative case because it is the direct object, meaning it is the thing being promised. It looks exactly like the dictionary form (nominative) because feminine nouns that end in a consonant do not change their form in the accusative.

Why doesn't the sentence start with ja (I)?

In Polish, subject pronouns like ja are usually dropped because the verb ending (-ę in obiecuję) already tells us exactly who is performing the action. You would only include it if you wanted to add strong emphasis.